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Anggoro D, Purba MS, Jiang F, Nishida N, Itoh H, Itamoto K, Nemoto Y, Nakaichi M, Sunahara H, Tani K. Elucidation of the radius and ulna fracture mechanisms in toy poodle dogs using finite element analysis. J Vet Med Sci 2024:23-0520. [PMID: 38556325 DOI: 10.1292/jvms.23-0520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/02/2024] Open
Abstract
Fractures occurring in the distal radius and ulna of toy breed dogs pose distinctive challenges for veterinary practitioners, requiring specialized treatment approaches primarily based on anatomical features. Finite Element Analysis (FEA) was applied to conduct numerical experiments to determine stress distribution across the bone. This methodology offers an alternative substitute for directly investigating these phenomena in living dog experiments, which could present ethical obstacles. A three-dimensional bone model of the metacarpal, carpal, radius, ulna, and humerus was reconstructed from Computed Tomography (CT) images of the toy poodle and dachshund forelimb. The model was designed to simulate the jumping and landing conditions from a vertical distance of 40 cm to the ground within a limited timeframe. The investigation revealed considerable variations in stress distribution patterns between the radius and ulna of toy poodles and dachshunds, indicating notably elevated stress levels in toy poodles compared to dachshunds. In static and dynamic stress analysis, toy poodles exhibit peak stress levels at the distal radius and ulna. The Von Mises stresses for toy poodles reach 90.07 MPa (static) and 1,090.75 MPa (dynamic) at the radius and 1,677.97 MPa (static) and 1,047.98 MPa (dynamic) at the ulna. Conversely, dachshunds demonstrate lower stress levels for 5.39 MPa (static) and 231.79 MPa (dynamic) at the radius and 390.56 MPa (static) and 513.28 MPa (dynamic) at the ulna. The findings offer valuable insights for modified treatment approaches in managing fractures in toy breed dogs, optimizing care and outcomes.
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Affiliation(s)
- Dito Anggoro
- Laboratory of Veterinary Surgery, Joint Graduate School of Veterinary Medicine, Yamaguchi University
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, Gadjah Mada University
| | - Melpa Susanti Purba
- Laboratory of Veterinary Surgery, Joint Graduate School of Veterinary Medicine, Yamaguchi University
| | - Fei Jiang
- Department of Mechanical Engineering, Graduate School of Sciences and Technology for Innovation, Yamaguchi University
| | - Norihiro Nishida
- Department of Orthopedic Surgery, Graduate School of Medicine, Yamaguchi University
| | - Harumichi Itoh
- Laboratory of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Kazuhito Itamoto
- Laboratory of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Yuki Nemoto
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Munekazu Nakaichi
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Hiroshi Sunahara
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Kenji Tani
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University
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Anggoro D, Purba MS, Jiang F, Nishida N, Itoh H, Itamoto K, Nemoto Y, Nakaichi M, Sunahara H, Tani K. Finite element study on post-screw removal stress in toy poodle radius with different plate designs and screw arrangements. Open Vet J 2024; 14:885-894. [PMID: 38682140 PMCID: PMC11052620 DOI: 10.5455/ovj.2024.v14.i3.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 02/29/2024] [Indexed: 05/01/2024] Open
Abstract
Background The study employs finite element analysis to investigate stress distribution in the radius of toy poodles after screw removal. The examination focuses on the biomechanical implications of varied screw hole configurations using 1.5 and 2.0-mm locking compression plates (LCPs) with notched head T-Plates. Aim To provide a noninvasive approach to analyzing the immediate consequences of screw removal from the radius bone in toy poodles. Specifically, it explores the impact of varied plate designs and screw arrangements on stress distribution within the forelimb bones. Methods The study constructs a three-dimensional bone model of the toy poodle's forelimb based on computed tomography (CT) images. Simulations were designed to replicate jumping and landing from a 40 cm height, comparing stress distribution in the radius post-screw removal. Results The analysis reveals significant variations in stress distribution patterns between the two LCPs. The radius implanted with the 2.0-mm LCP displays a uniform stress distribution, contrasting with the 1.5-mm plates. Localized stress concentration is observed around the screw holes, while trabecular bone regions near the screw holes exhibit lower stress levels. Conclusion The study highlights the plate designs and screw configurations that affect bone stress in toy poodle forelimbs post-screw removal. The findings provide valuable insights for veterinarians, aiding informed decisions in veterinary orthopedic practices.
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Affiliation(s)
- Dito Anggoro
- Laboratory of Veterinary Surgery, Joint Graduate School of Veterinary Medicine, Yamaguchi University, Japan
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, Gadjah Mada University, Indonesia
| | - Melpa Susanti Purba
- Laboratory of Veterinary Surgery, Joint Graduate School of Veterinary Medicine, Yamaguchi University, Japan
| | - Fei Jiang
- Department of Mechanical Engineering, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Japan
| | - Norihiro Nishida
- Department of Orthopedic Surgery, Graduate School of Medicine, Yamaguchi University, Japan
| | - Harumichi Itoh
- Laboratory of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Japan
| | - Kazuhito Itamoto
- Laboratory of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Japan
| | - Yuki Nemoto
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Japan
| | - Munekazu Nakaichi
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Japan
| | - Hiroshi Sunahara
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Japan
| | - Kenji Tani
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Japan
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Itoh H, Itamoto T, Tani K, Sunahara H, Nemoto Y, Nakaichi M, Iseri T, Horikirizono H, Itamoto K. Relationship between clinical parameters and malformations in dogs diagnosed with atlanto-axial instability. PLoS One 2024; 19:e0293363. [PMID: 38324604 PMCID: PMC10849214 DOI: 10.1371/journal.pone.0293363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 10/11/2023] [Indexed: 02/09/2024] Open
Abstract
Atlanto-axial instability is a common disease that affects toy-breed dogs. Most cases of atlanto-axial instability are congenital. Furthermore, patients with atlanto-axial instability are predisposed to other concurrent diseases. Therefore, this study aimed to retrospectively determine the presence of concurrent diseases in cases with atlanto-axial instability using imaging data and analyze the relationship between clinical parameters and the incidence of complex malformations. The clinical data and imaging findings of 41 toy-breed dogs diagnosed with atlanto-axial instability were analyzed using their medical records and imaging data. Occipital dysplasia (17/27), atlanto-occipital overlapping (22/34), dens dysplasia (27/41), Chiari-like malformation (8/34), syringomyelia (5/34), lateral ventricular enlargement (20/36), and intracranial arachnoid cyst (5/35) were observed in patients with atlanto-axial instability. The body weight of the patients in the groups with atlanto-occipital overlapping and lateral ventricular enlargement was lower than that of those in the groups without these diseases (1.78 ± 0.71 vs 2.71 ± 1.15 kg, P = 0.0269, 1.60 ± 0.40 vs 2.75 ± 1.08 kg, P = 0.001, respectively). Furthermore, when the correlation between the total number of concurrent diseases and the age at onset and body weight was examined, it became clear that lower body weight was associated with the incidence of a greater number of concurrent diseases. Thus, the findings of this study suggest that toy-breed dogs are more likely to present with complex malformations and should be evaluated carefully with additional examinations and treatment methods.
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Affiliation(s)
- Harumichi Itoh
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Takuya Itamoto
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Yuki Nemoto
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Laboratory of Veterinary Radiology Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Toshie Iseri
- Laboratory of Veterinary Radiology Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Hiro Horikirizono
- Laboratory of Veterinary Radiology Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City, Yamaguchi, Japan
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Horikirizono H, Nakaichi M, Itoh H, Itamoto K, Nemoto Y, Sunahara H, Tani K. Intraoperative hypertensive crisis in a dog with functional paraganglioma of the gall bladder. J Small Anim Pract 2024; 65:144-148. [PMID: 37559209 DOI: 10.1111/jsap.13665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 06/11/2023] [Accepted: 07/12/2023] [Indexed: 08/11/2023]
Abstract
A 15-year-old spayed female mongrel presented with anorexia and an abdominal mass. The mass originated from the gall bladder and was surgically resected along with divisionectomy of the central hepatic division. Paroxysmal hypertension and tachycardia were noted during manipulation of the mass. Following resection, arterial blood pressure decreased significantly. Histopathological analysis confirmed a diagnosis of neuroendocrine neoplasm. Immunohistochemical staining for synaptophysin and chromogranin A yielded diffuse and strong positive results, while gastrin was positive in only 10% of the cells. The preoperative elevated concentrations of catecholamine in the urinalysis showed a marked decrease after surgery. Based on these findings, the tumour was diagnosed as a functional paraganglioma of the gall bladder. The patient has undergone regular thoracic radiographs and ultrasound examinations and, until 431 days after surgery, has shown no signs of metastases or recurrences. Based on our literature search, we report the first case of functional paraganglioma of the gall bladder in a dog.
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Affiliation(s)
- H Horikirizono
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
- Animal Medical Centre, Faculty of Applied Biological Sciences, Gifu University, 1-1, Yanagido, Gifu, 501-1193, Japan
| | - M Nakaichi
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
| | - H Itoh
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
| | - K Itamoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
| | - Y Nemoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
| | - H Sunahara
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
| | - K Tani
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8515, Japan
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Anggoro D, Purba MS, Nishida N, Itoh H, Itamoto K, Nemoto Y, Nakaichi M, Sunahara H, Tani K. Quantitative evaluation of the biomechanical and viscoelastic properties of the dog patellar tendon in response to neuromuscular blockade at different stifle angles. PLoS One 2024; 19:e0292453. [PMID: 38166027 PMCID: PMC10760779 DOI: 10.1371/journal.pone.0292453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 09/14/2023] [Indexed: 01/04/2024] Open
Abstract
The patellar tendon (PT) is crucial for maintaining stability and facilitating movement in the stifle joint. Elastography has been recognized as a prominent method for evaluating PT properties in humans and dogs. The utilization of oscillation methods in canine studies remains limited despite their extensive documentation in human studies. Our study represents the first effort to quantitatively assess and compare the effects of muscle relaxant on the biomechanical and viscoelastic characteristics of the PT at varying stifle angles in living dogs. Five healthy female beagles were used in this study. Biomechanical (tone, stiffness, and decrement) and viscoelastic (relaxation time and creep) properties of the PT were measured using MyotonPRO (Myoton Ltd, Estonia) prior to and following administration of rocuronium (0.5 mg/kg/body weight) at normal, extended, and flexed positions. Rocuronium was selected for its safety, controllability, and widespread clinical use in veterinary anesthesia. Two-way analysis of variance showed that tone, stiffness, and decrement were significantly higher (P < 0.001) in the control group than in the muscle relaxation group. At the same time, relaxation time and creep were significantly lower (P < 0.001) in the control group than in the muscle relaxation group. The findings indicate that stifle angle position and muscle rexalant administration fundamentally alter the biomechanical loading conditions of the PT, leading to changes in its viscoelastic properties. Therefore, this novel quantitative data could benefit clinical settings that necessitate accurate and objective methods for risk identification and monitoring PT biomechanics in dogs.
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Affiliation(s)
- Dito Anggoro
- Laboratory of Veterinary Surgery, Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, Gadjah Mada University, Yogyakarta, Indonesia
| | - Melpa Susanti Purba
- Laboratory of Veterinary Surgery, Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Norihiro Nishida
- Department of Orthopedic Surgery, Graduate School of Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Laboratory of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Laboratory of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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Igase M, Inanaga S, Nishibori S, Itamoto K, Sunahara H, Nemoto Y, Tani K, Horikirizono H, Nakaichi M, Baba K, Kambayashi S, Okuda M, Sakai Y, Sakurai M, Kato M, Tsukui T, Mizuno T. Proof-of-concept study of the caninized anti-canine programmed death 1 antibody in dogs with advanced non-oral malignant melanoma solid tumors. J Vet Sci 2024; 25:e15. [PMID: 38311328 PMCID: PMC10839171 DOI: 10.4142/jvs.23144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 12/09/2023] [Accepted: 12/17/2023] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND The anti-programmed death 1 (PD-1) antibody has led to durable clinical responses in a wide variety of human tumors. We have previously developed the caninized anti-canine PD-1 antibody (ca-4F12-E6) and evaluated its therapeutic properties in dogs with advance-staged oral malignant melanoma (OMM), however, their therapeutic effects on other types of canine tumors remain unclear. OBJECTIVE The present clinical study was carried out to evaluate the safety profile and clinical efficacy of ca-4F12-E6 in dogs with advanced solid tumors except for OMM. METHODS Thirty-eight dogs with non-OMM solid tumors were enrolled prospectively and treated with ca-4F12-E6 at 3 mg/kg every 2 weeks of each 10-week treatment cycle. Adverse events (AEs) and treatment efficacy were graded based on the criteria established by the Veterinary Cooperative Oncology Group. RESULTS One dog was withdrawn, and thirty-seven dogs were evaluated for the safety and efficacy of ca-4F12-E6. Treatment-related AEs of any grade occurred in 13 out of 37 cases (35.1%). Two dogs with sterile nodular panniculitis and one with myasthenia gravis and hypothyroidism were suspected of immune-related AEs. In 30 out of 37 dogs that had target tumor lesions, the overall response and clinical benefit rates were 6.9% and 27.6%, respectively. The median progression-free survival and overall survival time were 70 days and 215 days, respectively. CONCLUSIONS The present study demonstrated that ca-4F12-E6 was well-tolerated in non-OMM dogs, with a small number of cases showing objective responses. This provides evidence supporting large-scale clinical trials of anti-PD-1 antibody therapy in dogs.
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Affiliation(s)
- Masaya Igase
- Laboratory of Molecular Diagnostics and Therapeutics, The United Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Sakuya Inanaga
- Laboratory of Molecular Diagnostics and Therapeutics, The United Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Shoma Nishibori
- Laboratory of Molecular Diagnostics and Therapeutics, The United Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Kazuhito Itamoto
- Laboratory of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Yuki Nemoto
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Kenji Tani
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Hiro Horikirizono
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Munekazu Nakaichi
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Kenji Baba
- Laboratory of Veterinary Internal Medicine, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Satoshi Kambayashi
- Laboratory of Veterinary Internal Medicine, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Masaru Okuda
- Laboratory of Veterinary Internal Medicine, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Yusuke Sakai
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Masashi Sakurai
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Masahiro Kato
- Nippon Zenyaku Kogyo Co., Ltd., Koriyama, Fukushima 963-0196, Japan
| | - Toshihiro Tsukui
- Nippon Zenyaku Kogyo Co., Ltd., Koriyama, Fukushima 963-0196, Japan
| | - Takuya Mizuno
- Laboratory of Molecular Diagnostics and Therapeutics, The United Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan.
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Nakaichi M, Itamoto T, Nemoto Y, Sunahara H, Itoh H, Itamoto K, Tani K. Osteosarcoma of the hyoid bone in a cat. JFMS Open Rep 2023; 9:20551169231188642. [PMID: 37781726 PMCID: PMC10540576 DOI: 10.1177/20551169231188642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023] Open
Abstract
Case summary A 10-year-old male neutered Abyssinian cat was presented with the chief complaint of a right pharyngeal mass. On palpation, the mass was easily palpable; it appeared well demarcated and mobile, and oval in shape. Radiographic examination showed a radiopaque pharyngeal mass, which was revealed to be a well-demarcated mass lesion with a radiopaque marginal area on CT examination. The inside of the mass was uniformly well enhanced on contrast CT examination. A three-dimensional image reconstructed from the CT images strongly suggested that the mass originated from the right stylohyoid bone. No abnormal lesions were observed in the thoracic and abdominal CT examinations. Surgical excision of the mass was scheduled 3 weeks after the first admission. The mass was bluntly separated from the surrounding musculature and resected together with the ipsilateral epihyoid bone adjacent to the mass. Histopathological examination of the resected mass showed neoplastic cells with osteoid formation, and the mass was histopathologically diagnosed as an osteosarcoma. The postoperative recovery from anaesthesia was uneventful, and the cat began feeding on its own from the third postoperative day. The 3-month postoperative CT evaluation revealed no local recurrence or distant metastasis. The cat showed no abnormal findings at the time of writing (6 months postoperatively). Relevance and novel information Although osteosarcoma derived from the hyoid bone has rarely been reported in the veterinary field, this report suggests that such tumours may occur in cats. In addition, partial excision of the hyoid apparatus seems to be well tolerated in cats.
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Affiliation(s)
- Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Takuya Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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Itamoto K, Itoh H, Sunahara H, Horikirizono H, Nemoto Y, Tani K, Iseri T, Nakaichi M. Comparison of surgical invasiveness between micro-endoscopic discectomy/microscopic discectomy and conventional hemilaminectomy in dogs. J Vet Med Sci 2023. [PMID: 37100630 DOI: 10.1292/jvms.22-0226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023] Open
Abstract
Micro-endoscopic discectomy (MED) or microscopic discectomy (MD) have been performed for disc herniation in humans. The purpose of this study was to compare the invasiveness of the hemilaminectomy in dogs between the approach using a cylindrical retractor for the MED/MD and a conventional open surgical approaches in dogs. First, as preliminary studies, we analyzed the suitability of the cylindrical retractor for the vertebral body of small to medium-sized dogs on the X-ray computed tomographic images using the three-dimensional analysis software, and confirmed that it was possible to open a bone window of an approximate length of 1.72 clto the spinal canal with the cylindrical retractor with a diameter 17 mm using two medium-sized canine cadavers. Next, to determine difference in the invasiveness of hemilaminectomy, the magnitude of tissue damage, surgical stress and postoperative pain were compared between the conventional open approach (hemilaminectomy group: HL group, n=6) and the surgical approach using the cylindrical retractor (MD group, n=6) in 12 beagle dogs. The plasma creatine phosphokinase, C-reactive protein and cortisol concentrations, incision length and University of Melbourne Pain Scale scores after the hemilaminectomy were significantly lower in the MD group than in the HL group. There were no significant differences between the durations of surgery and the other evaluated indices. The approach using the MD can provide a less invasive hemilaminectomy than the conventional approach in dogs.
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Affiliation(s)
- Kazuhito Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Harumichi Itoh
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Yuki Nemoto
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University
| | - Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University
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Iseri T, Tanabe Y, Onizuka R, Torigoe Y, Horikirizono H, Itamoto K, Sunahara H, Itoh H, Tani K, Nakaichi M. A Monte Carlo study on dose distribution of an orthovoltage radiation therapy system. Phys Eng Sci Med 2023; 46:623-632. [PMID: 36940063 DOI: 10.1007/s13246-023-01237-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 02/23/2023] [Indexed: 03/21/2023]
Abstract
It is important to plan radiotherapy treatment and establish optimal dose distribution to reduce the chances of side effects and injury. Because there are no commercially available tools for calculating dose distribution in orthovoltage radiotherapy in companion animals, we developed an algorithm to accomplish this and verified its characteristics using tumor disease cases. First, we used the Monte Carlo method to develop an algorithm to calculate the dose distribution of orthovoltage radiotherapy (280 kVp; MBR-320, Hitachi Medical Corporation, Tokyo, Japan) using BEAMnrc at our clinic. Using development of Monte Carlo method, dose distribution for tumor and normal organs were evaluated in brain tumors, squamous cell carcinomas of the head, and feline nasal lymphomas. In all cases of brain tumors, the mean dose delivered to the GTV ranged from 36.2 to 76.1% of the prescribed dose due to the decrease through the skull. In the nasal lymphoma in cats, the eyes with covered a 2 mm-thick lead plate, the respective average dose to the eyes was 71.8% and 89.9% less than that to the uncovered eyes. The findings may be useful for informed decision making in orthovoltage radiotherapy with more effective and targeted irradiation and data collection allowing detailed informed consent.
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Affiliation(s)
- Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, Yamagishi, Japan.
| | - Yoshinori Tanabe
- Graduate School of Health Sciences, Okayama University, Okayama, Japan
| | - Ryouta Onizuka
- Department of Therapeutic Radiology, Yamaguchi University Hospital, Yamaguchi, Japan
| | - Yuri Torigoe
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, Yamagishi, Japan
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, Yamagishi, Japan
| | - Kazuhito Itamoto
- Animal medical center, Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Animal medical center, Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi, Yamagishi, Japan
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Nemoto Y, Nakaichi M, Sakurai M, Itamoto K, Morimoto M, Horikirizono H, Itoh H, Sunahara H, Tani K. Histiocytic sarcoma with spinal necrosis in a dog with progressing non-ambulatory tetraparesis. Open Vet J 2023; 13:394-399. [PMID: 37026072 PMCID: PMC10072830 DOI: 10.5455/ovj.2023.v13.i3.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 02/17/2023] [Indexed: 03/30/2023] Open
Abstract
Background:
Histiocytic sarcoma (HS) is an aggressive malignant neoplasm, and widespread metastasis occurs with a fatal outcome. HS involving the central nervous system is relatively uncommon. Spinal cord necrosis, a very rare condition, could be induced by ischemia or infarction. Here, we report a dog progressing non-ambulatory tetraparesis with spinal cord necrosis caused by HS.
Case Description:
A 9-year-old male Labrador retriever was presented with a progressing non-ambulatory tetraparesis. CT imaging revealed lysis of the spinous process of T7 and a ring-shaped lesion surrounding the soft tissue of lung fields. T2-weighted MRI showed the spinous processes of T6 to T8 as hyperintense, and the lesion infiltrated into the T7 vertebra and the spinal cord. After euthanasia, the final diagnosis upon necropsy was HS, which was observed in the lung, spinous process, thoracic cord, and the pulmonary hilar lymph node. Moreover, necrotic spots were spread widely through the thoracic spinal cord.
Conclusion:
This report outlines a case of canine HS in the lung, spinous process, thoracic cord, and pulmonary hilar lymph node. Ischemic deficit and necrosis of the thoracic spinal cord resulted from the compression of perivascular tumor cells, which rapidly led to progressive tetraparesis. Although the diagnosis was difficult, MRI and CT images helped determine the prognosis. To our knowledge, this is the first case report of canine HS with direct spinal cord involvement associated with spinal necrosis.
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Affiliation(s)
- Yuki Nemoto
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
- Corresponding Author: Yuki Nemoto. Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan. .
| | - Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Masashi Sakurai
- Department of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Masahiro Morimoto
- Department of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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11
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Inanaga S, Igase M, Sakai Y, Hagimori K, Sunahara H, Horikirizono H, Itamoto K, Baba K, Ohsato Y, Mizuno T. Relationship of microsatellite instability to mismatch repair deficiency in malignant tumors of dogs. J Vet Intern Med 2022; 36:1760-1769. [PMID: 35959511 PMCID: PMC9511092 DOI: 10.1111/jvim.16454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 05/10/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Microsatellite instability (MSI) is a type of genomic instability caused by mismatch repair deficiency (dMMR) in tumors. Studies on dMMR/MSI are limited, and the relationship between dMMR and MSI is unknown in tumors of dogs. OBJECTIVES We aimed to identify the frequency of dMMR/MSI by tumor type and evaluate the relationship between dMMR and MSI in tumors of dogs. ANIMALS In total, 101 dogs with 11 types of malignant tumors were included. METHODS We extracted DNA from fresh normal and tumor tissues. Twelve microsatellite loci from both normal and tumor DNA were amplified by PCR and detected by capillary electrophoresis. Each microsatellite (MS) was defined as MSI if a difference in product size between the tumor and normal DNA was detected. The dMMR was evaluated by immunohistochemistry with formalin-fixed paraffin-embedded tumor tissues. Next, we confirmed whether dMMR induces MSI by serial passaging of MMR gene knockout cell lines for 3 months. RESULTS Microsatellite instability was detected frequently in oral malignant melanoma. The number of MSI-positive markers was higher in cases with dMMR than in those with proficient MMR (P < .0001). Statistical analysis indicated that the occurrence of MSI in FH2305 might have relevance to dMMR. Furthermore, MSI occurred in dMMR cell lines 3 months after passaging. CONCLUSIONS AND CLINICAL IMPORTANCE Microsatellite instability and dMMR more frequently were found in oral malignant melanoma than in other tumors, and dMMR has relevance to MSI in both clinical cases and cell lines.
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Affiliation(s)
- Sakuya Inanaga
- Laboratory of Molecular Diagnostics and Therapeutics, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Masaya Igase
- Laboratory of Molecular Diagnostics and Therapeutics, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yusuke Sakai
- Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan
| | | | - Hiroshi Sunahara
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiro Horikirizono
- Laboratory of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Laboratory of Companion Animal Medicine, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Baba
- Laboratory of Veterinary Internal Medicine, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | | | - Takuya Mizuno
- Laboratory of Molecular Diagnostics and Therapeutics, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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12
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Itoh H, Igari K, Tani K, Sunahara H, Nemoto Y, Nakaichi M, Iseri T, Horikirizono H, Itamoto K. Clinical relationship between histopathological necrotic/partial necrotic findings and disease condition of gallbladder mucoceles in dogs. Pol J Vet Sci 2022; 25:223-229. [PMID: 35861958 DOI: 10.24425/pjvs.2022.141806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Gallbladder mucocele (GM) is a common extrahepatic biliary disease recognized in dogs and is defined as the expansion and extension of the gallbladder by an accumulation of semi-solid bile or bile acid. Histopathological diagnosis of necrotizing cholecystitis and transmural coagulative necrosis of the gallbladder wall shows poor prognosis. Conversely, histopathological diagnosis with partial necrotic findings is often achieved. We hypothesized that histopathological partial necrosis of the gallbladder wall is the primary lesion of necrotic cholecystitis or transmural ischemic necrosis. Therefore, we investigated the relationship between histopathological necrosis/ partial necrosis findings and their clinical conditions. We retrospectively analyzed 55 dogs diagnosed with GM that had undergone cholecystectomy at the Yamaguchi University Animal Medical Center. The group with histopathological necrosis/partial necrosis of the gallbladder wall showed elevated levels of preoperative white blood cells, alanine transaminase, alkaline phosphatase, γ-glutamyltransferase, total bilirubin, and C-reactive protein compared to the non-necrotic group. Partial necrosis of the gallbladder wall may affect the progression of the disease and hematological abnormalities. Additionally, all death cases until 2 weeks were included in the histopathological necrosis/partial necrosis group. In this study, we found that poor prognosis factors were associated with partial necrosis of the gallbladder wall. Furthermore, these cases of partial necrosis showed elevated levels of blood test parameters. These results suggest that necrosis of the gallbladder wall is associated with poor prognosis and poor pathophysiological conditions.
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Affiliation(s)
- H Itoh
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi 753-8515, Japan
| | - K Igari
- Pet Clinic Hallelujah, 2544-1 Nakabaru, Kasuya, Kasuya-gun, Fukuoka 811-2304, Japan
| | - K Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi 753-8515, Japan
| | - H Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi 753-8515, Japan
| | - Y Nemoto
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi 753-8515, Japan
| | - M Nakaichi
- Laboratory of Veterinary Radiology Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi, 753-8511, Japan
| | - T Iseri
- Laboratory of Veterinary Radiology Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi, 753-8511, Japan
| | - H Horikirizono
- Laboratory of Veterinary Radiology Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi, 753-8511, Japan
| | - K Itamoto
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi 753-8515, Japan
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Nakaichi M, Iseri T, Horikirizono H, Itoh H, Sunahara H, Nemoto Y, Itamoto K, Tani K. Pedigree study of the heredity of copper-associated hepatitis in Dalmatians in Japan. Can Vet J 2022; 63:633-636. [PMID: 35656524 PMCID: PMC9112360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The pedigrees of 3 Dalmatian dogs afflicted with copper-associated hepatitis were investigated to discover the mode of inheritance. A composite family pedigree showed that the 3 affected Dalmatians were related. None of the parents of the affected dogs showed clinical symptoms of liver disease, and the disease had no sex predisposition. The estimated segregation ratio was approximately 3:1 based on surviving littermates. These findings suggested that the copper-associated hepatitis in these Dalmatians was an autosomal recessive mode of inheritance. In addition, some male Dalmatians imported from abroad might have been involved in the occurrence of this disease in Japan.
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Affiliation(s)
- Munekazu Nakaichi
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Toshie Iseri
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Hiro Horikirizono
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Harumichi Itoh
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Yuki Nemoto
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Kazuhito Itamoto
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Kenji Tani
- Department of Veterinary Radiology (Nakaichi, Iseri, Horikirizono), Department of Veterinary Small Animal Clinical Science (Itoh, Itamoto), Department of Veterinary Surgery (Sunahara, Nemoto, Tani), Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
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14
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Iseri T, Horikirizono H, Abe M, Itoh H, Sunahara H, Nemoto Y, Itamoto K, Tani K, Nakaichi M. Outcomes of megavoltage radiotherapy for canine intranasal tumors and its relationship to clinical stages. Open Vet J 2022; 12:383-390. [PMID: 35821780 PMCID: PMC9270932 DOI: 10.5455/ovj.2022.v12.i3.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 05/16/2022] [Indexed: 11/08/2022] Open
Abstract
Background: Radiation therapy is considered important for the treatment of intranasal tumors in dogs and is believed to be essential for prolonging their survival. Aim: To investigate the contribution of clinical staging to improve outcomes of megavoltage radiotherapy for canine intranasal tumors. Methods: A total of 123 dogs with intranasal tumors were included in the study. Forty-eight dogs received orthovoltage radiotherapy after cytoreductive surgery (Group I), 21 received orthovoltage radiotherapy without surgery (Group II), and 54 received megavoltage radiotherapy without surgery (Group III). All cases in each group were classified into clinical stages 1–4, and the median survival time (MST) was compared for each stage in all groups. Results: The overall MST was not significantly difference among Group I (325 days), Group II (317 days), and Group III (488 days); however, Group III was prolonged than Groups I and II. The MSTs for stages 1, 2, 3, and 4 were 597, 361, 267, and 325 days in Group I; 633, 260, 233, and 329 days in Group II; and 931, 860, 368, and 176 days in Group III, respectively. The MST for stage 2 cases in Group III was significantly prolonged when compared with that in Groups I and II; no significant difference was observed at other stages; however, the MST in Group III was longer in stage 1. These results showed that megavoltage radiotherapy prolonged the MST in dogs with intranasal tumors when compared to orthovoltage radiation with or without cytoreductive surgery, and that improvements in MST at stage 2 contributed significantly to this. Conclusion: The improvement in the MST in dogs with stages 1 and 2 intranasal tumors highlights the importance of starting megavoltage radiotherapy in the early stages.
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Affiliation(s)
- Toshie Iseri
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
- Corresponding Author: Toshie Iseri. Joint Faculty of Veterinary Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-City, Yamaguchi, 753-8515, Japan.
| | - Hiro Horikirizono
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Momoko Abe
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
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15
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Iseri T, Hira N, Tanabe Y, Horikirizono H, Sunahara H, Itoh H, Nemoto Y, Itamoto K, Tani K, Nakaichi M. Evaluation of setup errors of immobilization device for radiation therapy in companion animals. Open Vet J 2022; 12:929-935. [PMID: 36650854 PMCID: PMC9805779 DOI: 10.5455/ovj.2022.v12.i6.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 11/01/2022] [Indexed: 12/26/2022] Open
Abstract
Background Intensity-modulated radiotherapy (IMRT), which allows generating steep dose gradients, is a beneficial treatment for companion animals with adjacent target and risk organs. IMRT is essential for high setup accuracy for avoiding overdose to risk organs, and optimal radiotherapy is important for evaluating the setup accuracy of companion animals. Aim To use an immobilization device to evaluate setup errors in radiotherapy for companion animals. Methods We calculated setup errors in radiotherapy for 386 animals (dogs and cats; 3,261 registration images) that underwent radiotherapy between 2016 and 2022. The companion animals were immobilized with a customized bite block and vacuum lock device. A quantile-quantile plot with 95% confidence interval (CI) was used to evaluate the histogram of the setup errors, and the systematic and random setup errors were calculated for each region (brain, head and neck, chest and abdomen, pelvis, and spine). Results The setup error in each direction presented an extremely narrow-interval histogram, with the following lower and upper 95% CIs: cranial-caudal (-0.08, -0.06 cm); left-right (-0.04, -0.02 cm); and dorsal-ventral (-0.13, -0.11 cm). The mean systematic setup error was 0.16 cm (range: 0.12-0.36 cm), and the random error was 0.15 cm (range: 0.08-0.34 cm). The pelvis showed the highest systematic and random setup errors (mean: 0.36 and 0.23 cm, respectively). Conclusion The use of an immobilization device enables highly accurate radiotherapy for companion animals (95% CI < 0.15 cm).
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Affiliation(s)
- Toshie Iseri
- Faculty of Agriculture, Animal Medical Emergency Center, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Nanami Hira
- Facilty of Health Sciences, Okayama University Medical School, Okayama, Japan
| | - Yoshinori Tanabe
- Faculty of Medicine, Graduate School of Health Sciences, Okayama University, Okayama, Japan,Corresponding Author: Yoshinori Tanabe. Faculty of Medicine, Graduate School of Health Sciences, Okayama University, Okayama, Japan.
| | - Hiro Horikirizono
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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Nakaichi M, Iseri T, Horikirizono H, Itoh H, Sunahara H, Nemoto Y, Itamoto K, Tani K. A long survival case of spinal nephroblastoma in a dog. Open Vet J 2022; 12:188-191. [PMID: 35603077 PMCID: PMC9109834 DOI: 10.5455/ovj.2022.v12.i2.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 02/28/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Dogs’ nephroblastoma of the spinal cord is a rare neoplastic disease, with few reports of long-term survival after surgery. We experienced that surgical treatment with postoperative radiation therapy for spinal nephroblastoma in a dog resulted in the long-term survival of 11 years. Case Description: The patient presented to our veterinary hospital because of progressive hindlimb paralysis. Based on diagnostic imaging, she was diagnosed with a thoracolumbar spinal cord tumor and was treated with surgery. The gross tumor tissue was removed after laminectomy, followed by postoperative radiation therapy using orthovoltage equipment. The histopathological features of the surgical specimen were consistent with those of previously reported spinal nephroblastoma, although infrequent mitotic figures were observed. The dog recovered well after treatment and resumed her normal walking condition. No tumor recurrence was observed on periodic follow-up magnetic resonance imaging performed 10 and 21 months after surgery. Imaging evaluation for the gradual development of hindlimb weakness was performed 9 years after surgery; however, no recurrence of tumor tissue was observed, and spondylosis deformans, probably induced after laminectomy, were identified as a possible cause. The dog died of aspiration pneumonia 11 years after surgery, independent of spinal nephroblastoma. Conclusion: To date, no clinical cases of canine spinal cord primary nephroblastoma that survived for 11 years after surgery have been reported. This case strongly suggests that providing intensive treatment for canine spinal nephroblastoma is very important.
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Affiliation(s)
- Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
- Corresponding Author: Munekazu Nakaichi. Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan.
| | - Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
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17
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Iseri T, Tanabe Y, Horikirizono H, Sunahara H, Itoh H, Nemoto Y, Itamoto K, Tani K, Tanaka H, Nakaichi M. Adjustment of multi-leaf collimator parameters in 4-MV and 6-MV IMRT: A study of veterinary clinical cases. Open Vet J 2022; 12:407-413. [PMID: 35821783 PMCID: PMC9270939 DOI: 10.5455/ovj.2022.v12.i3.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 05/25/2022] [Indexed: 11/06/2022] Open
Abstract
Background: For optimal treatment, it is important to maintain optimal multi-leaf collimator (MLC) transmission in intensity-modulated radiation therapy (IMRT). However, adjustment of transmissions has not been reported in veterinary medicine. Aim: To demonstrate that appropriate MLC parameter adjustment for IMRT using 4- and 6-MV energy can reduce the need for quality assurance revalidation in real companion animal clinical cases. Methods: The MLC parameters (leaf transmission and leaf offset) of the treatment planning system were adjusted by evaluating seven plans (10 × 10 cm, 3ABUT, DMLC, 7segA, FOURL, HDMLC, and HIMRT) and 20 preclinical cases (10 cases each in 4- and 6-MV groups). Subsequently, 101 IMRT plans of 88 cases (77 dogs and 11 cats) were evaluated for absolute dose of plan target volume (PTV) and organs at risk (OAR) and were analyzed for the relative dose distribution by gamma analysis (3%/3 mm, >10%) using EBT3 film. Results: After adjustment of the MLC parameters (leaf transmission and leaf offset, 4 MV: 0.008 and 0, 6 MV: 0.005 and 0, respectively), the data from 101 plans (4 MV: 64 plans and 6 MV: 37 plans) treated with IMRT showed PTV <3%, OAR <5%, and gamma analysis pass rates ≥95% in all cases. Conclusion: Clinically meaningful dose distributions can be created even with a limited validation device if the treatment parameters are adjusted appropriately, even for tumors in canines and felines, where the irradiation field is small, the target is adjacent to the OAR, and the target is often superficial.
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Affiliation(s)
- Toshie Iseri
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Yoshinori Tanabe
- Faculty of Medicine, Graduate School of Health Sciences, Okayama University, Okayama, Japan
- Corresponding Author: Yoshinori Tanabe. Faculty of Medicine, Graduate School of Health Sciences, Okayama University, 5-1 Shikata-cho, 2-chome, Kita-ku, Okayama, 700-8558, Japan.
| | - Hiro Horikirizono
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Hiroshi Sunahara
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Harumichi Itoh
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Yuki Nemoto
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Kazuhito Itamoto
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Kenji Tani
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
| | - Hidekazu Tanaka
- Faculty of Medicine and Health Sciences, Yamaguchi University, 1-1-1 Minami-Kogushi, Ube-shi, Japan
| | - Munekazu Nakaichi
- Joint faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi-shi, Japan
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18
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Miura K, Sunahara H, Sakai Y, Isshiki S, Hasegawa M, Oda M. Effective treatment with mitotane for a canine case of presumed ectopic Cushing's syndrome-related pheochromocytoma. Open Vet J 2022; 12:762-767. [PMID: 36589399 PMCID: PMC9789766 DOI: 10.5455/ovj.2022.v12.i5.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 09/12/2022] [Indexed: 11/06/2022] Open
Abstract
Background In humans, ectopic Cushing's syndrome (ECS) is characterized by hypercortisolemia, which is caused by small lung carcinoma, bronchial carcinoids, and pheochromocytoma. In dogs, only a few cases of ECS associated with pheochromocytoma have been reported to date. Case Description Herein, we describe a canine case of malignant pheochromocytoma that is presumed to be the cause of ECS. An 11-year-old, castrated, male Toy Poodle with hypercortisolemia was diagnosed with an adrenal tumor (AT) and treated with mitotane. Although repeated adrenocorticotropic hormone stimulation tests revealed improvement in the dog's condition by mitotane treatment, its condition started declining 197 days post-diagnosis, and he died on day 280. The necropsy revealed the AT was a pheochromocytoma, not an adrenocortical tumor. However, because of no pathological change in the pituitary gland and the other adrenal gland, pheochromocytoma was presumed to be the cause of ECS. Conclusion This is the first report that describes the effectiveness of mitotane against presumed ECS-related pheochromocytoma.
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Affiliation(s)
- Konatsu Miura
- Oda Animal Hospital, Hiroshima, Japan,Corresponding Author: Konatsu Miura. Oda Animal Hospital, Hiroshima, Japan.
| | - Hiroshi Sunahara
- Laboratory of Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yusuke Sakai
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Saneyuki Isshiki
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Moe Hasegawa
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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Nakasumi K, Yamamoto N, Takami T, Itoh H, Itamoto K, Horikirizono H, Iseri T, Nakaichi M, Nemoto Y, Sunahara H, Tani K. Effect of drug-eluting bead transarterial chemoembolization loaded with cisplatin on normal dogs. J Vet Med Sci 2021; 84:114-120. [PMID: 34866073 PMCID: PMC8810336 DOI: 10.1292/jvms.21-0396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Transcatheter arterial embolization (TAE) and transcatheter arterial chemoembolization (TACE) are standard treatments for advanced hepatocellular carcinoma (HCC) and particularly for unresectable tumors or liver metastases in humans. However, reports on TACE used in veterinary medicine are few. This study aimed to evaluate the feasibility and safety of drug-eluting bead transarterial chemoembolization (DEB-TACE). We performed DEB-TACE in four clinically normal dogs and pharmacokinetically compared the results against hepatic arterial infusion (HAI) of cisplatin in two dogs. Drug-eluting beads (DEB) loaded with cisplatin were injected through a microcatheter for selective embolization of the left hepatic artery. After embolization, computed tomography (CT) images and histological examination findings were obtained during a 4-week observation period. Serum platinum concentrations were measured to evaluate cisplatin after each procedure. Biochemical analysis was performed during a 12-week observation period. Embolization was successful in all dogs, and there were no clinically apparent abnormalities. Embolization was confirmed up to 4 weeks after DEB-TACE in two of the four dogs and up to 1 week in the other two dogs using postoperative CT images. Cisplatin was not detected in peripheral veins in all dogs after DEB-TACE, but it was detected in trace amounts after HAI. DEB-TACE using cisplatin was safe and well tolerated by normal dogs. DEB-TACE may be useful in terms of determining systemic toxicity and drug concentration within tumors.
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Affiliation(s)
- Ko Nakasumi
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Naoki Yamamoto
- Department of Gastroenterology & Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi University
| | - Taro Takami
- Department of Gastroenterology & Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi University
| | - Harumichi Itoh
- Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Kazuhito Itamoto
- Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Yuki Nemoto
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Hiroshi Sunahara
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University
| | - Kenji Tani
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University
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20
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Sunahara H, Tani K, Nemoto Y, Itamoto K, Itoh H, Nakaichi M, Iseri T, Horikirizono H. Transient third-degree atrioventricular block during anesthesia in a cat. Open Vet J 2021; 11:662-666. [PMID: 35070861 PMCID: PMC8770184 DOI: 10.5455/ovj.2021.v11.i4.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 10/17/2021] [Indexed: 12/03/2022] Open
Abstract
Background: Third-degree atrioventricular block (AVB) is usually permanent, with transient cases being rare. Cats with transient third-degree AVB. It had been not reported in detail. Case Description: A 9.3-year-old, male shorthair cat was evaluated for possible nervous disease resulting from otitis interna. Under propofol and isoflurane anesthesia, this cat developed a third-degree AVB. Isoproterenol was administered by continuous infusion to increase its heart rate. During recovery, heart rate returned to sinus bradycardia together with first-degree AVB without medical treatment. The cause of transient AVB was not observed at the examination. Conclusion: The case of this cat suggests that anesthesia can result in a transient third-degree AVB.
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Affiliation(s)
- Hiroshi Sunahara
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kenji Tani
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Yuki Nemoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Kazuhito Itamoto
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Harumichi Itoh
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Munekazu Nakaichi
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Toshie Iseri
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
| | - Hiro Horikirizono
- Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, Japan
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21
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Itoh H, Tani K, Sunahara H, Nakaichi M, Iseri T, Horikirizono H, Itamoto K. Sphere-forming cells display stem cell-like characteristics and increased xCT expression in a canine hepatocellular carcinoma cell line. Res Vet Sci 2021; 139:25-31. [PMID: 34246940 DOI: 10.1016/j.rvsc.2021.06.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 06/07/2021] [Accepted: 06/09/2021] [Indexed: 12/24/2022]
Abstract
Hepatocellular carcinoma (HCC) is the most common type of canine primary liver tumor; however, most chemotherapies against HCC are ineffective due to resistance to anticancer agents. Sphere-forming cells are considered to act as cancer stem cells for various types of solid tumors and have been established for many canine tumor cell lines, yet no studies have reported sphere-forming cells for canine HCC. In this study, we established sphere-forming cells from a canine HCC cell line (AZACH). These cells displayed increased stem cell marker mRNA expression (Nanog, Sox2, c-Myc, and Klf4), aldehyde dehydrogenase activity, and chemoresistance against mitoxantrone, gemcitabine, and doxorubicin. In addition, sphere-forming cells exhibited higher xCT expression and lower intracellular reactive oxygen species levels than adherent cells. Treatment with sulfasalazine, a xCT-specific inhibitor, reduced sphere formation efficiency. Together, these results indicate that sphere-forming cells derived from a canine HCC cell line have similar characteristics to cancer stem cells and that their increased xCT expression and associated resistance to oxidative stress contribute toward sphere formation.
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Affiliation(s)
- Harumichi Itoh
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Munekazu Nakaichi
- Laboratory of Veterinary Radiology Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8511, Japan
| | - Toshie Iseri
- Laboratory of Veterinary Radiology Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8511, Japan
| | - Hiro Horikirizono
- Laboratory of Veterinary Radiology Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8511, Japan
| | - Kazuhito Itamoto
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan.
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22
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Nakaichi M, Iseri T, Horikirizono H, Komine M, Itoh H, Sunahara H, Nemoto Y, Itamoto K, Tani K. Copper-associated hepatitis in a young Dalmatian dog in Japan. J Vet Med Sci 2021; 83:911-915. [PMID: 33840721 PMCID: PMC8267186 DOI: 10.1292/jvms.21-0061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
A male 25-month-old Dalmatian dog attended our veterinary hospital because of anorexia and high circulating liver enzyme activities. Abdominal computed
tomography showed a slightly small liver with rounded edges, and laparoscopic examination showed that the liver was yellowish. Histopathological examination
revealed multifocal necrosis of hepatocytes and severe chronic hepatitis. Rhodanine staining showed severe copper accumulation in hepatocytes and a quantitative
analysis of the copper content of the liver showed substantial accumulation (10.3 mg/g dry mass), suggesting a diagnosis of copper-associated hepatitis.
Previously reported canine mutation in the COMMD1, the gene responsible for the copper-associated hepatitis in the Bedlington terrier, was not
identified. To our knowledge, this is the first report of copper-associated hepatitis in a Dalmatian in Japan.
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Affiliation(s)
- Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Misa Komine
- IDEXX Laboratories K.K., Koganei, Tokyo 184-8515, Japan
| | - Harumichi Itoh
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Yuki Nemoto
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Kazuhito Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
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Nakaichi M, Iseri T, Horikirizono H, Sakai Y, Itoh H, Sunahara H, Itamoto K, Tani K. Clinical features and their course of pituitary carcinoma with distant metastasis in a dog. J Vet Med Sci 2020; 82:1671-1675. [PMID: 33028750 PMCID: PMC7719888 DOI: 10.1292/jvms.20-0500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
An 11-year-old male toy poodle with neurological symptoms was diagnosed with a macroscopic pituitary tumor, which produced adrenocorticotropic hormone. Radiation therapy with a linear accelerator was performed for the pituitary tumor, and resulted in good local tumor control. However, serum endogenous adrenocorticotropic hormone concentrations were uncontrollable even after the tumor disappeared. Abdominal computed tomography revealed splenic masses, and splenectomy was performed. Histopathological examination of the surgical specimen showed tumor cells with eosinophilic and finely granular cytoplasm suggestive of endocrine origin. Since these cells were positive for adrenocorticotropic hormone, the case was diagnosed as a pituitary carcinoma with distant metastasis. Necropsy revealed multiple metastases to the abdominal organs. This is the first case report describing canine pituitary carcinoma with distant metastasis.
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Affiliation(s)
- Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Hiro Horikirizono
- Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Yusuke Sakai
- Department of Veterinary Pathology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Harumichi Itoh
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Kazuhito Itamoto
- Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi-shi, Yamaguchi 753-8515, Japan
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24
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Itoh H, Nishikawa S, Tani K, Sunahara H, Nakaichi M, Iseri T, Taura Y, Itamoto K. Cystine transporter expression is a marker to identify a subpopulation of canine adipose-derived stem cells. J Vet Med Sci 2020; 82:713-720. [PMID: 32269196 PMCID: PMC7324832 DOI: 10.1292/jvms.19-0373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Adipose-derived stem cells (ADSCs) are promising cell sources for regenerative medicine
due to the simplicity of their harvest and culture; however, their biological properties
are not completely understood. Moreover, recent murine and human studies identified
several functional subpopulations of ADSCs varying in differentiation potential; however,
there is a lack of research on canine ADSCs. Cystine transporter (xCT) is a stem cell
marker in gastric and colon cancers that interacts with CD44 to enhance cystine uptake
from the cell surface and subsequently accelerates intercellular glutathione levels. In
this study, we identified a ~5% functional subpopulation of canine ADSCs with
xCT+ expression (xCTHi). Compared with those of the
xCT− subpopulation (xCTLo), the xCTHi subpopulation
showed a significantly higher proliferation rate, higher expression of conventional stem
cell markers (SOX2, KLF4, and c-Myc),
and higher expression of adipogenic markers (FABP4 and
PPARγ). By contrast, the xCTLo subpopulation showed
significantly higher expression of osteogenic markers (BMP1 and
SPP) than xCTHi cells. These results suggest xCT as a
candidate marker for detecting a functional subpopulation of canine ADSCs.
Mechanistically, xCT could increase the adipogenic potential while decreasing the
osteogenic differentiation potential, which could serve as a valuable target marker in
regenerative veterinary medicine.
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Affiliation(s)
- Harumichi Itoh
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Shimpei Nishikawa
- Department of Medical Data Science, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan
| | - Kenji Tani
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Munekazu Nakaichi
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Toshie Iseri
- Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Yasuho Taura
- Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
| | - Kazuhito Itamoto
- Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
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Nakasumi K, Sunahara H, Igari K, Itoh H, Itamoto K, Yamamoto N, Ishikawa T, Takami T, Sakaida I, Taura Y, Tani K. Effect of transcatheter arterial embolisation in normal canine liver using trisacryl gelatine microspheres (Embosphere). Res Vet Sci 2020; 129:174-177. [PMID: 32036125 DOI: 10.1016/j.rvsc.2020.01.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 01/19/2020] [Accepted: 01/22/2020] [Indexed: 10/25/2022]
Abstract
The effect of selective transcatheter arterial embolisation (TAE) using trisacryl gelatine microspheres (TGMs) in the normal canine liver was investigated. Selective embolisation was achieved by injecting TGMs into the left hepatic artery through a microcatheter in four healthy dogs. After embolisation, computed tomography (CT), biochemical analysis and histological examination were performed during a 12-week observation period. Embolisation was successful in all four dogs. Postoperative CT revealed consistent embolisation of the artery within the experimental period in three dogs. Hepatic enzyme levels slightly increased after embolisation but tapered to normal ranges. Histological examinations revealed no abnormal changes. Thus, selective TAE with TGMs was well tolerated in normal dogs and may be applicable to canine hepatocellular carcinoma.
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Affiliation(s)
- Ko Nakasumi
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Hiroshi Sunahara
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Kazuaki Igari
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Harumichi Itoh
- Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Kazuhito Itamoto
- Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Naoki Yamamoto
- Department of Gastroenterology & Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi University, 1-1-1 Minami Kogushi, Ube, Yamaguchi 755-8505, Japan
| | - Tsuyoshi Ishikawa
- Department of Gastroenterology & Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi University, 1-1-1 Minami Kogushi, Ube, Yamaguchi 755-8505, Japan
| | - Taro Takami
- Department of Gastroenterology & Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi University, 1-1-1 Minami Kogushi, Ube, Yamaguchi 755-8505, Japan
| | - Isao Sakaida
- Department of Gastroenterology & Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi University, 1-1-1 Minami Kogushi, Ube, Yamaguchi 755-8505, Japan
| | - Yasuho Taura
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Kenji Tani
- Departments of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi, 1677-1 Yoshida, Yamaguchi 753-8515, Japan.
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Sugimoto K, Fujii Y, Ogura Y, Sunahara H, Aoki T. Influence of alterations in heart rate on left ventricular echocardiographic measurements in healthy cats. J Feline Med Surg 2016; 19:841-845. [PMID: 27502088 DOI: 10.1177/1098612x16661374] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objectives The purpose of this study was to evaluate the effect of sudden alterations in heart rate (HR) on left ventricular (LV) wall thickness and dimensions determined by echocardiography in healthy cats. Methods Six experimental cats were used. All cats were anaesthetised and HR was controlled with right atrial pacing. The interventricular septum and left ventricular free wall thickness at end diastole (IVSd and LVFWd, respectively), left ventricular end-diastolic and end-systolic diameter (LVIDd and LVIDs, respectively) and shortening fraction (FS) of each cat were assessed using echocardiography at pacing rates of 120, 130, 140, 150, 160, 170 and 180 ppm. Results There were significant relationships between HR and IVSd, LVFWd, LVIDd, LVIDs and FS. As the HR increased, LV wall thickness increased and chamber dimensions got smaller in a linear fashion. The maximum and minimum differences in wall thickness between 120 ppm and 180 ppm were 2.0 mm and 0.7 mm in single measurements, respectively. Conclusions and relevance LV wall thickness and dimensions were significantly influenced by alterations in HR.
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Affiliation(s)
- Keisuke Sugimoto
- Laboratory of Surgery 1, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Yoko Fujii
- Laboratory of Surgery 1, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Yuto Ogura
- Laboratory of Surgery 1, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Hiroshi Sunahara
- Laboratory of Surgery 1, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Takuma Aoki
- Laboratory of Surgery 1, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
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27
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Sugimoto K, Fujii Y, Takubo I, Shiga T, Sunahara H, Aoki T, Orito K. Pharmacodynamics of alacepril in healthy cats. J Feline Med Surg 2016; 19:706-709. [PMID: 26927816 DOI: 10.1177/1098612x16636420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objectives The aims of this study were to investigate the pharmacodynamics of alacepril and to determine the appropriate dose for clinical usage in cats. Methods Six experimental cats were used. Each cat received alacepril orally at a single dose of 1 mg/kg, 2 mg/kg and 3 mg/kg. Blood samples were collected before administration and at 2, 4, 6, 8, 12, 24, 36, 48 and 72 h after administration to measure serum angiotensin converting enzyme (ACE) activity. Systolic blood pressure was also measured at the same time point. Results Dose-dependent inhibition of ACE activity was observed. Doses of 2 mg/kg and 3 mg/kg alacepril were considered to effectively inhibit ACE activity. There were no significant differences in systolic blood pressue among groups at any time point. Conclusions and relevance Alacepril 2-3 mg/kg q24h may be an appropriate dosage for clinical use in cats.
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Affiliation(s)
- Keisuke Sugimoto
- 1 Laboratory of Surgery, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Yoko Fujii
- 1 Laboratory of Surgery, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Izumi Takubo
- 1 Laboratory of Surgery, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Toshinori Shiga
- 2 Laboratory of Physiology, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Hiroshi Sunahara
- 1 Laboratory of Surgery, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Takuma Aoki
- 1 Laboratory of Surgery, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
| | - Kensuke Orito
- 2 Laboratory of Physiology, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
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28
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Takano H, Kokubu A, Sugimoto K, Sunahara H, Aoki T, Fujii Y. Left ventricular structural and functional abnormalities in dogs with hyperadrenocorticism. J Vet Cardiol 2015; 17:173-81. [DOI: 10.1016/j.jvc.2015.07.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 06/28/2015] [Accepted: 07/07/2015] [Indexed: 01/10/2023]
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29
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Aoki T, Madarame H, Sugimoto K, Sunahara H, Fujii Y, Kanai E, Ito T. Diode laser coagulation for the treatment of epistaxis in a Scottish fold cat. Can Vet J 2015; 56:745-748. [PMID: 26130838 PMCID: PMC4466829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the case of a 4-year-old, castrated 4.2-kg Scottish fold cat with recurrent epistaxis that was unresponsive to medical therapy. Diathermocoagulation of the nasal mucosa with a diode laser controlled the epistaxis and there was no significant recurrence of epistaxis during 1 year of follow-up.
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Affiliation(s)
- Takuma Aoki
- Address all correspondence to Dr. Takuma Aoki; e-mail:
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Aoki T, Sunahara H, Sugimoto K, Ito T, Kanai E, Neo S, Fujii Y, Wakao Y. Dynamic left ventricular outflow tract obstruction secondary to hypovolemia in a German Shepard dog with splenic hemangiosarcoma. J Vet Med Sci 2015; 77:1187-90. [PMID: 25924797 PMCID: PMC4591166 DOI: 10.1292/jvms.14-0508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Dynamic left ventricular outflow tract obstruction (DLVOTO) is a common condition in cats and humans. In this case report, a dog is described with DLVOTO secondary to severe intra-abdominal hemorrhage caused by a hemangiosarcoma. The dog was a 9-year-old, 35.7-kg, spayed female German Shepard dog that presented with a history of tachypnea and collapse. A Levine II/VI systolic murmur was present at the heart base. Abdominal ultrasonography revealed a splenic mass and a large amount of ascites. Echocardiography showed a reduced left ventricular diameter and an increased aortic velocity caused by systolic anterior motion (SAM) of the mitral valve apparatus. The heart murmur and the SAM were resolved after treatment including a splenectomy and a blood transfusion.
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Affiliation(s)
- Takuma Aoki
- Laboratory of Veterinary Surgery I, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5201, Japan
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Sugimoto K, Fujii Y, Sunahara H, Aoki T. Assessment of left ventricular longitudinal function in cats with subclinical hypertrophic cardiomyopathy using tissue Doppler imaging and speckle tracking echocardiography. J Vet Med Sci 2015; 77:1101-8. [PMID: 25877405 PMCID: PMC4591151 DOI: 10.1292/jvms.14-0354] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Hypertrophic cardiomyopathy (HCM) in cats is characterized by concentric left
ventricular (LV) hypertrophy and both diastolic and systolic dysfunction. Although
impaired cardiac function detected by tissue Doppler imaging (TDI) in cats with HCM was
previously reported, reference ranges of TDI in normal cats and cats with HCM have been
reported as widely variable. Two-dimensional speckle tracking echocardiography (STE) was
useful for assessment of cardiac function in human patients with HCM, but clinical utility
was not known in cats. The aim of this study was to assess global and segmental LV
myocardial function using STE in cats with HCM whose TDI variables were within the
reference range. A total of 35 cats of different breeds were enrolled in this study. The
HCM group (n=22) was cats diagnosed as HCM without left atrial enlargement and with normal
TDI measurements. HCM cats were further divided into a segmental hypertrophy (S-HCM) group
and a diffuse hypertrophy (D-HCM) group. The control group consisted of 13 clinically
healthy cats. No cats in any group showed any clinical symptoms. Conventional
echocardiography, TDI, and global and segmental STE indices were evaluated and compared
between groups. Only the longitudinal strain rate during early diastole was significantly
decreased in both HCM groups, even in all segments including those without hypertrophy in
S-HCM group. This study suggests that STE parameters are the more sensitive variables
compared with conventional TDI parameters to detect early myocardial diastolic dysfunction
in cats with HCM.
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Affiliation(s)
- Keisuke Sugimoto
- Laboratory of Surgery 1, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5201, Japan
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Abstract
Case 1 involved a 4-month-old intact male Somali cat in which peripheral pulmonary artery
stenosis (PPS) was recognized after a cardiac murmur remained following patent ductus
arteriosus ligation. Case 2, which involved a 1-year-old neutered male Norwegian Forest
cat, and Case 3, which involved a 6-month-old intact female American Curl cat, were
referred, because of cardiac murmurs. Grades III to IV/VI systolic heart murmurs were
auscultated at the left heart base in all 3 cats. All cases showed bilateral pulmonary
artery stenosis, although there were no associated clinical signs. In Cases 1 and 2, the
pressure gradient through the stenosis decreased after treatment with atenolol.
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Affiliation(s)
- Takuma Aoki
- Laboratory of Veterinary Surgery I, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5201, Japan
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Aoki T, Sunahara H, Sugimoto K, Ito T, Kanai E, Fujii Y. Infective endocarditis of the aortic valve in a Border collie dog with patent ductus arteriosus. J Vet Med Sci 2014; 77:331-6. [PMID: 25391395 PMCID: PMC4383780 DOI: 10.1292/jvms.14-0384] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Infective endocarditis (IE) in dogs with cardiac shunts has not been reported previously.
However, we encountered a dog with concurrent patent ductus arteriosus (PDA) and IE. The
dog was a 1-year-old, 13.9-kg female Border collie and presented with anorexia, weight
loss, pyrexia (40.4°C) and lameness. A continuous murmur with maximal intensity over the
left heart base (Levine 5/6) was detected on auscultation. Echocardiography revealed a PDA
and severe aortic stenosis (AS) caused by aortic-valve vegetative lesions.
Corynebacterium spp. and Bacillus subtilis were
isolated from blood cultures. The dog responded to aggressive antibiotic therapy, and the
PDA was subsequently surgically corrected. After a series of treatments, the dog showed
long-term improvement in clinical status.
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Affiliation(s)
- Takuma Aoki
- Laboratory of Veterinary Surgery I, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5201, Japan
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Abstract
A two-month-old female Chihuahua was diagnosed as severe pulmonary valvular stenosis (PS). Although balloon valvuloplasty (BV) was successfully performed, restenosis was observed 19 months after the procedure. Euthanasia was chosen due to low output syndrome during the surgical repair attempted when the dog was 5 years old. Postmortem examination revealed markedly thickened pulmonary valve due to the increase of extracellular matrix which might be produced by increased α smooth muscle actin-positive myofibroblasts. The thickening of the valve was associated with restriction of the valve's motion, resulting in restenosis in the present case. This is the first case report documented histopathological and immunohistochemical findings of the restenotic pulmonary valve in dogs with PS after BV.
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Affiliation(s)
- Hiroshi Sunahara
- Laboratory of Surgery 1, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5201, Japan
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Fujii Y, Ishikawa T, Sunahara H, Sugimoto K, Kanai E, Kayanuma H, Mishina M, Aoki T. Partial anomalous pulmonary venous connection in 2 Miniature Schnauzers. J Vet Intern Med 2013; 28:678-81. [PMID: 24372895 PMCID: PMC4858002 DOI: 10.1111/jvim.12272] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 10/02/2013] [Accepted: 11/06/2013] [Indexed: 11/30/2022] Open
Affiliation(s)
- Y Fujii
- School of Veterinary Medicine, Azabu University, Kanagawa, Japan
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Abstract
Mitral valvuloplasty (MVP) is used in dogs with refractory mitral regurgitation (MR); however, it is difficult to tie the artificial chord, i.e., the expanded polytetrafluoroethylene suture, at the planned height of the mitral valve, because of the slippery nature of the knot. The loop technique has resolved these difficulties in humans. Premanufactured loops (length, 8.0-15.0 mm with 1.0-mm increments) were used in the new modified loop technique. In the current study, cardiac murmurs disappeared, and the MR markedly improved or completely disappeared approximately 3 months after surgery in 3 dogs. Therefore, this new technique might be effective in dogs.
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Affiliation(s)
- Takuma Aoki
- Department of Surgery, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan.
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Ito K, Sakamoto J, Nagaoka K, Takayama Y, Kanahori T, Sunahara H, Hayashi T, Sato S, Hirokawa T, Tanaka K. [Analysis of aliphatic carboxylic acids in anaerobic digestion process waters by ion-exclusion chromatography]. Se Pu 2012; 30:369-373. [PMID: 22799193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023] Open
Abstract
The analysis of seven aliphatic carboxylic acids (formic, acetic, propionic, iso-butyric, n-butyric, iso-valeric and n-valeric acid) in anaerobic digestion process waters for biogas production was examined by ion-exclusion chromatography with dilute acidic eluents (benzoic acid, perfluorobutyric acid (PFBA) and sulfuric acid) and non-suppressed conductivity/ultraviolet (UV) detection. The columns used were a styrene/divinylbenzene-based strongly acidic cation-exchange resin column (TSKgel SCX) and a polymethacrylate-based weakly acidic cation-exchange resin column (TSKgel Super IC-A/C). Good separation was performed on the TSKgel SCX in shorter retention times. For the TSKgel Super IC-A/C, peak shape of the acids was sharp and symmetrical in spite of longer retention times. In addition, the mutual separation of the acids was good except for iso- and n-butyric acids. The better separation and good detection was achieved by using the two columns (TSKgel SCX and TSKgel Super IC-A/C connected in series), lower concentrations of PFBA and sulfuric acid as eluents, non-suppressed conductivity detection and UV detection at 210 nm. This analysis was applied to anaerobic digestion process waters. The chromatograms with conductivity detection were relatively simpler compared with those of UV detection. The use of two columns with different selectivities for the aliphatic carboxylic acids and the two detection modes was effective for the determination and identification of the analytes in anaerobic digestion process waters containing complex matrices.
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Affiliation(s)
- Kazuaki Ito
- Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, Higashi-Hiroshima 739-2116, Japan.
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Fujii Y, Nishimoto Y, Sunahara H, Takano H, Aoki T. Prevalence of Patent Foramen Ovale with Right-to-Left Shunting in Dogs with Pulmonic Stenosis. J Vet Intern Med 2011; 26:183-5. [DOI: 10.1111/j.1939-1676.2011.00839.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 08/24/2011] [Accepted: 10/12/2011] [Indexed: 11/30/2022] Open
Affiliation(s)
- Y. Fujii
- School of Veterinary Medicine; Azabu University; Kanagawa; Japan
| | - Y. Nishimoto
- School of Veterinary Medicine; Azabu University; Kanagawa; Japan
| | - H. Sunahara
- School of Veterinary Medicine; Azabu University; Kanagawa; Japan
| | - H. Takano
- School of Veterinary Medicine; Azabu University; Kanagawa; Japan
| | - T. Aoki
- School of Veterinary Medicine; Azabu University; Kanagawa; Japan
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Ito K, Takayama Y, Ikedo M, Mori M, Taoda H, Xu Q, Hu W, Sunahara H, Hayashi T, Sato S, Hirokawa T, Tanaka K. Determination of some aliphatic carboxylic acids in anaerobic digestion process waters by ion-exclusion chromatography with conductimetric detection on a weakly acidic cation-exchange resin column. J Chromatogr A 2004; 1039:141-5. [PMID: 15250416 DOI: 10.1016/j.chroma.2004.01.068] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The determination of seven aliphatic carboxylic acids, formic, acetic, propionic, isobutyric, n-butyric, isovaleric and n-valeric acids in anaerobic digestion process waters was examined using ion-exclusion chromatography with conductimetric detection. The analysis of these biologically important carboxylic acids is necessary as a measure for evaluating and controlling the process. The ion-exclusion chromatography system employed consisted of polymethacrylate-based weakly acidic cation-exchange resin columns (TSKgel OApak-A or TSKgel Super IC-A/C). weakly acidic eluent (benzoic acid), and conductimetric detection. Particle size and cation-exchange capacity were 5 microm and 0.1 meq./ml for TSKgel OApak-A and 3 microm and 0.2 meq./ml for TSKgel Super IC-A/C, respectively. A dilute eluent (1.0-2.0 mM) of benzoic acid was effective for the high resolution and highly conductimetric detection of the carboxylic acids. The good separation of isobutyric and n-butyric acids was performed using the TSKgel Super IC-A/C column (150 mm x 6.0 mm i.d. x 2). The simple and good chromatograms were obtained by the optimized ion-exclusion chromatography conditions for real samples from mesophilic anaerobic digestors, thus the aliphatic carboxylic acids were successfully determined without any interferences.
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Affiliation(s)
- Kazuaki Ito
- Department of Chemistry and Biotechnology, School of Engineering, Kinki University, 1 Umenobe, Takaya, Higashi-Hiroshima 739-2116, Japan.
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Sunahara H, Ward DN, Griffin AC. Polarographic Studies on Natural Peptides. II. Polarography of Oxytocin, Lysine- and Arginine-Vasopressin in Co(III) Ammonia-Ammonium Chloride Solutions1a. J Am Chem Soc 2002. [DOI: 10.1021/ja01508a014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sunahara H, Ward DN, Griffin AC. Polarographic Studies on Natural Peptides. I. Polarography of Oxytocin, Lysine, and Arginine-vasopressin in Cobalt(II) Ammonia-Ammonium Chloride Solutions1a. J Am Chem Soc 2002. [DOI: 10.1021/ja01508a013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ito K, Shimazu H, Shoto E, Okada M, Hirokawa T, Sunahara H. Ion chromatographic separation of alkali metal and ammonium cations on a C18 reversed-phase column. J Chromatogr A 1994. [DOI: 10.1016/0021-9673(94)80284-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Yang M, Yoshimura M, Okada M, Nagai S, Sunahara H. Anaerobic digestion using a fixed-bed reactor with bacteria immobilized by polyacrylate on a saddle-shaped slag support. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0922-338x(92)90188-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kuroda K, Gaiger Silveira R, Nishio N, Sunahara H, Nagai S. Measurement of dissolved hydrogen in an anaerobic digestion process by a membrane-covered electrode. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0922-338x(91)90254-e] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ito K, Shoto E, Sunahara H. Ion chromatography of inorganic iodine species using C18 reversed-phase columns coated with cetyltrimethylammonium. J Chromatogr A 1991. [DOI: 10.1016/s0021-9673(00)91438-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ito K, Sunahara H. Ion chromatography with ultraviolet and amperometric detection for iodide and thiocyanate in concentrated salt solutions. J Chromatogr A 1990. [DOI: 10.1016/s0021-9673(01)89569-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yamashige T, Yamamoto M, Sunahara H. Comparison of decomposition methods for the analysis of atmospheric particulates by atomic absorption spectrometry. Analyst 1989. [DOI: 10.1039/an9891401071] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sunahara H, Xie WM, Kayama M. Phosphate removal by column packed blast furnace slag ‐ I. Fundamental research by synthetic wastewater. ACTA ACUST UNITED AC 1987. [DOI: 10.1080/09593338709384521] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Xie WM, Zhang XC, Kitaide T, Sunahara H. Phosphate removal by column packed blast furnace slag ‐ II. Practical application of secondary effluent. ACTA ACUST UNITED AC 1987. [DOI: 10.1080/09593338709384522] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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