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Foss KD, Billhymer AC. Magnetic resonance imaging in canine idiopathic epilepsy: a mini-review. Front Vet Sci 2024; 11:1427403. [PMID: 39021411 PMCID: PMC11251927 DOI: 10.3389/fvets.2024.1427403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Accepted: 06/19/2024] [Indexed: 07/20/2024] Open
Abstract
Magnetic resonance imaging (MRI) in an integral part of the diagnostic workup in canines with idiopathic epilepsy (IE). While highly sensitive and specific in identifying structural lesions, conventional MRI is unable to detect changes at the microscopic level. Utilizing more advanced neuroimaging techniques may provide further information on changes at the neuronal level in the brain of canines with IE, thus providing crucial information on the pathogenesis of canine epilepsy. Additionally, earlier detection of these changes may aid clinicians in the development of improved and targeted therapies. Advances in MRI techniques are being developed which can assess metabolic, cellular, architectural, and functional alterations; as well alterations in neuronal tissue mechanical properties, some of which are currently being applied in research on canine IE. This mini-review focuses on novel MRI techniques being utilized to better understand canine epilepsy, which include magnetic resonance spectroscopy, diffusion-weighted imaging, diffusion tensor imaging, perfusion-weighted imaging, voxel based morphometry, and functional MRI; as well as techniques applied in human medicine and their potential use in veterinary species.
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Affiliation(s)
- Kari D. Foss
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL, United States
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Weston P, Behr S, Garosi L, Maeso C, Carrera I. Ischemic stroke can have a T1w hyperintense appearance in absence of intralesional hemorrhage. Front Vet Sci 2022; 9:932185. [PMID: 36204294 PMCID: PMC9530315 DOI: 10.3389/fvets.2022.932185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 08/10/2022] [Indexed: 11/13/2022] Open
Abstract
Magnetic resonance imaging (MRI) signal changes associated with ischemic stroke are typically described as T2w and FLAIR hyperintense, and T1w isointense lesions. Intralesional T1w hyperintensity is generally attributed to either a hemorrhagic stroke, or an ischemic stroke with hemorrhagic transition, and has an associated signal void on gradient echo (GE) sequences. Cases of ischemic stroke with T1w hyperintense signal in absence of associated signal void on GE sequences have been sporadically demonstrated in human stroke patients, as well as in dogs with experimentally induced ischemia of the middle cerebral artery. This multicenter retrospective descriptive study investigates the presence of T1w hyperintensity in canine stroke without associated signal void on GE sequences. High field (1.5 Tesla) MRI studies of 12 dogs with clinical presentation, MRI features, and cerebrospinal fluid results suggestive of non-hemorrhagic stroke were assessed. The time between the observed onset of clinical signs and MRI assessment was recorded. All 12 patients had an intralesional T1w hyperintense signal compared to gray and white matter, and absence of signal void on T2*w GE or SWI sequences. Intralesional T1w hyperintensities were either homogenously distributed throughout the entire lesion (6/12) or had a rim-like peripheral distribution (6/12). The mean time between the recorded onset of clinical signs and MRI assessment was 3 days; however, the age range of lesions with T1w hyperintense signal observed was 1–21days, suggesting that such signal intensities can be observed in acute, subacute, or chronic stages of ischemic stroke. Follow-up was recorded for 7/12 cases, all of which showed evidence of neurological improvement while in hospital, and survived to discharge. Correlation of the age and MRI appearance of lesions in this study with similar lesions observed in human and experimental studies suggests that these T1w hyperintensities are likely caused by partial tissue infarction or selective neuronal necrosis, providing an alternative differential for these T1w hyperintensities observed.
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Affiliation(s)
- Philippa Weston
- Willows Veterinary Centre and Referral Service, Linnaeus Veterinary Ltd., Birmingham, United Kingdom
- *Correspondence: Philippa Weston
| | - Sebastien Behr
- Willows Veterinary Centre and Referral Service, Linnaeus Veterinary Ltd., Birmingham, United Kingdom
| | | | - Christian Maeso
- Department of Neurology, Ars Veterinary Hospital, Barcelona, Spain
| | - Ines Carrera
- Willows Veterinary Centre and Referral Service, Linnaeus Veterinary Ltd., Birmingham, United Kingdom
- Vet Oracle Teleradiology, Norfolk, United Kingdom
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Niemann L, Beckmann K, Iannucci C, Wang Leandro A, Vigani A. Diagnosis of post-attenuation neurological signs syndrome in a cat with refractory status epilepticus and clinical response to therapeutic plasma exchange. JFMS Open Rep 2022; 8:20551169221121919. [PMID: 36132424 PMCID: PMC9484050 DOI: 10.1177/20551169221121919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Case summary An 8-year-old female spayed British Shorthair cat that underwent surgical portosystemic
shunt (PSS) attenuation developed progressive neurological signs 7 days postoperatively.
Neurological signs progressed, despite medical management, and seizure activity became
rapidly refractory to anticonvulsants. The diagnosis of post-attenuation neurological
signs (PANS) was made based on the timing of the occurrence of clinical signs following
surgery, absence of hyperammonaemia and suggestive MRI findings of the brain. The cat
developed status epilepticus that required treatment with general anaesthesia and
mechanical ventilation, from which the cat could not be effectively weaned without the
recurrence of seizures. Therapeutic plasma exchange (TPE) was performed as a rescue
therapy for PANS and associated refractory status epilepticus. A total of two plasma
volumes were processed during one single TPE session. The seizure activity resolved
immediately after the TPE session, the cat showed progressive improvement of
neurological signs and remained stable thereafter. No significant complications
associated with the TPE were observed. The cat was discharged 11 days after admission
and was fully recovered. Relevance and novel information This is an unusual report of PANS diagnosed in a cat based on clinical and MRI
findings. The cat developed refractory status epilepticus and had a positive outcome
following TPE as rescue therapy. The MRI findings in this report could be useful for the
diagnosis of PANS in cats. We speculate that TPE could be taken into consideration as a
possible therapeutic intervention in PANS syndrome.
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Affiliation(s)
- Lisa Niemann
- Department of Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Katrin Beckmann
- Department of Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Claudia Iannucci
- Department of Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Adriano Wang Leandro
- Department of Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Alessio Vigani
- Department of Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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Jones B, Behr S, Shaw T, Cappello R, Jeffery N, Liebel FX, Harcourt-Brown T. Surgical techniques used in the management of intra-arachnoid diverticula in dogs across four referral centres and their immediate outcome. J Small Anim Pract 2022; 63:520-525. [PMID: 35137433 PMCID: PMC9541676 DOI: 10.1111/jsap.13486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 11/23/2021] [Accepted: 01/18/2022] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To report the surgical techniques being used to treat single focal spinal intra-arachnoid diverticula in dogs, their complications and immediate postoperative outcomes. MATERIALS AND METHODS Retrospective multi-centre case series across four referral centres. RESULTS Fifty-seven dogs were included in the study. The most common type of surgery was durectomy (28 dogs) followed by marsupialisation (11 dogs), durotomy alone (seven dogs), shunt placement (six dogs) and stabilisation (five dogs). A higher proportion of intra-arachnoid shunt dogs became unable to walk in the immediate postoperative period (24 hours postsurgery) (4/6, 66%) compared to all dogs five of 57, 9% (2/7 durotomy alone, 3/28 durectomy alone). Of the nine dogs with immediate postoperative deterioration, seven had improved, walking without assistance, by 3 to 5 weeks postoperatively. CLINICAL SIGNIFICANCE This study does not identify an influence of surgical technique on short-term outcome. Dogs with a thoracolumbar intra-arachnoid diverticulum that undergo a shunt placement are likely to deteriorate neurologically in the immediate 24-hour postoperative period but appear to improve by 3 to 5 weeks after surgery. Further work is required to evaluate whether one surgical technique is superior for preventing or reducing long-term relapse.
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Affiliation(s)
- B Jones
- Neurology/Neurosurgery Service, Langford Vets Small Animal Hospital, Bristol, BS40 5DU, UK
| | - S Behr
- Neurology/Neurosurgery Service, Willows Veterinary Centre and Referral Services, Solihull, UK
| | - T Shaw
- Neurology/Neurosurgery Service, Willows Veterinary Centre and Referral Services, Solihull, UK
| | - R Cappello
- Neurology/Neurosurgery Service, North Downs Specialist Referrals, Bletchingley, RH1 4QP, UK
| | - N Jeffery
- Department of Small Animal Medicine & Surgery, College of Veterinary Medicine, Texas A&M University, College Station, TX, 77843, USA
| | - F X Liebel
- Neurology/Neurosurgery Service, Langford Vets Small Animal Hospital, Bristol, BS40 5DU, UK
| | - T Harcourt-Brown
- Neurology/Neurosurgery Service, Langford Vets Small Animal Hospital, Bristol, BS40 5DU, UK
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Kelley AJ, Stainback LB, Knowles KE, Moore TW, Plummer SB, Shoup OR. Clinical characteristics, magnetic resonance imaging features, treatment, and outcome for presumed intracranial coccidioidomycosis in 45 dogs (2009-2019). J Vet Intern Med 2021; 35:2222-2231. [PMID: 34410019 PMCID: PMC8478036 DOI: 10.1111/jvim.16243] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 07/27/2021] [Accepted: 07/28/2021] [Indexed: 12/16/2022] Open
Abstract
Background Knowledge of the clinical and magnetic resonance imaging (MRI) features of intracranial Coccidioides infection in dogs is essential for prompt diagnosis to limit disease‐associated morbidity and death. Objectives To describe the MRI appearance of intracranial coccidioidomycosis in dogs, identify associated clinical and clinicopathologic findings, and report outcomes of medical treatment. Animals Forty‐five client‐owned dogs with presumed intracranial Coccidioides infection. Methods Retrospective case series. Medical records and images were reviewed. Clinical history, examination findings, serology, imaging characteristics, treatment, and outcome were recorded. Included cases had an abnormal brain MRI and positive Coccidioides serology by agar‐gel‐immunodiffusion (AGID). Results Median age was 7‐years. Generalized tonic‐clonic seizures were the most common presenting sign (25/45). Two lesion categories were identified: a granulomatous form with 1 or more distinct, intra‐axial, contrast‐enhancing foci (37/45), and a second variation with diffuse, bilateral, symmetrical lesions of the caudate nuclei and frontal lobes (8/45). Serum IgG titers ranged from 1 : 1 to ≥ 1 : 256; 2 dogs had positive IgM titers at 1 : 2. All dogs with follow‐up serology (34/45) had a reduction in titer. Mean duration of follow‐up was 22.4 ± 20.5 months (median 16 months). Six dogs were lost to follow‐up <1‐year after diagnosis (median 9 months). Five dogs were clinically well but had yet to be followed for >1‐year. Of the remaining 34 dogs, 28 (82%) were alive ≥ 1‐year after diagnosis. Thirteen of these dogs had follow‐up times ≥ 2‐years. Conclusions and Clinical Importance The prognosis for intracranial Coccidioides infection is generally more favorable with medical treatment than in earlier reports.
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Affiliation(s)
- Ashley J Kelley
- Specialists in Companion Animal Neurology, Naples, Florida, USA
| | | | - Kim E Knowles
- Veterinary Neurological Center, Phoenix, Arizona, USA
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Hoffmann AC, Ruel Y, Gnirs K, Papageorgiou S, Zilberstein L, Nahmani S, Boddaert N, Gaillot H. Brain perfusion magnetic resonance imaging using pseudocontinuous arterial spin labeling in 314 dogs and cats. J Vet Intern Med 2021; 35:2327-2341. [PMID: 34291497 PMCID: PMC8478041 DOI: 10.1111/jvim.16215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 06/17/2021] [Accepted: 06/22/2021] [Indexed: 11/30/2022] Open
Abstract
Background Arterial spin labeling (ASL) is a noninvasive brain perfusion magnetic resonance imaging (MRI) technique that has not been assessed in clinical veterinary medicine. Hypothesis/Objectives To test the feasibility of ASL using a 1.5 Tesla scanner and provide recommendations for optimal quantification of cerebral blood flow (CBF) in dogs and cats. Animals Three hundred fourteen prospectively selected client‐owned dogs and cats. Methods Each animal underwent brain MRI including morphological sequences and ≥1 ASL sequences using different sites of blood labeling and postlabeling delays (PLD). Calculated ASL success rates were compared. The CBF was quantified in animals that had morphologically normal brain MRI results and parameters of ASL optimization were investigated. Results Arterial spin labeling was easily implemented with an overall success rate of 95% in animals with normal brain MRI. Technical recommendations included (a) positioning of the imaging slab at the foramen magnum and (b) selected PLD of 1025 ms in cats and dogs <7 kg, 1525 ms in dogs 7 to 38 kg, and 2025 ms in dogs >38 kg. In 37 dogs, median optimal CBF in the cortex and thalamic nuclei were 114 and 95 mL/100 g/min, respectively. In 28 cats, median CBF in the cortex and thalamic nuclei were 113 and 114 mL/100 g/min, respectively. Conclusions and Clinical Importance Our survey of brain perfusion ASL‐MRI demonstrated the feasibility of ASL at 1.5 Tesla, suggested technical recommendations and provided CBF values that should be helpful in the characterization of various brain diseases in dogs and cats.
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Affiliation(s)
- Anne-Cécile Hoffmann
- Unit of Diagnostic Imaging, ADVETIA Veterinary Referral Hospital, Vélizy-Villacoublay, France
| | - Yannick Ruel
- Unit of Diagnostic Imaging, ADVETIA Veterinary Referral Hospital, Vélizy-Villacoublay, France
| | - Kirsten Gnirs
- Unit of Neurology, ADVETIA Veterinary Referral Hospital, Vélizy-Villacoublay, France
| | - Stella Papageorgiou
- Unit of Neurology, ADVETIA Veterinary Referral Hospital, Vélizy-Villacoublay, France
| | - Luca Zilberstein
- Unit of Anesthesiology-Analgesia, ADVETIA Veterinary Referral Hospital, Vélizy-Villacoublay, France
| | - Sarah Nahmani
- Paediatric Radiology Department, AP-HP, Hôpital Necker Enfants Malades, Université de Paris, Paris, France
| | - Nathalie Boddaert
- Paediatric Radiology Department, AP-HP, Hôpital Necker Enfants Malades, Université de Paris, Paris, France.,Universié de Paris, Institut Imagine INSERM U1163, Paris, France
| | - Hugues Gaillot
- Unit of Diagnostic Imaging, ADVETIA Veterinary Referral Hospital, Vélizy-Villacoublay, France
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Hori A, Miyoshi K, Seo W, Kakuta A, Hanazono K, Nakade T. Cortical laminar necrosis detected by diffusion-weighted imaging in a dog suspected of having hypoglycemic encephalopathy. J Vet Med Sci 2020; 82:1763-1768. [PMID: 33132357 PMCID: PMC7804035 DOI: 10.1292/jvms.20-0134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
We describe a 5-year-old castrated male dog suspected hypoglycemic encephalopathy that was evaluated by using diffusion-weighted imaging (DWI). The dog
experienced hypoglycemia after prolonged generalized and continued partial seizures. In the acute phase, DWI showed hyperintensity in the left temporal lobe.
After about a month, DWI maintained hyperintensity, and left middle cerebral artery dilation was noted on magnetic resonance angiography (MRA). In the chronic
phase, the left temporal lobe lesion was replaced by cerebrospinal fluid. In humans, it was reported that cortical laminar necrosis (CLN) with hypoglycemic
encephalopathy presents hyperintensity in the cerebral cortex on DWI and increased vascularity of the middle cerebral artery branches on MRA. In conclusion, DWI
has detected CLN in a dog suspected hypoglycemic encephalopathy.
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Affiliation(s)
- Ai Hori
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582-1 Bunkyoudai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
| | - Kenjirou Miyoshi
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582-1 Bunkyoudai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
| | - Wakako Seo
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582-1 Bunkyoudai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
| | - Ako Kakuta
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582-1 Bunkyoudai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
| | - Kiwamu Hanazono
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582-1 Bunkyoudai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
| | - Tetsuya Nakade
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582-1 Bunkyoudai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
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Komornik L, Lautenschläger I, Vigani A, Iannucci C, Pozzi A, Wang-Leandro A, Beckmann K. Striate Artery Infarct After Bilateral Carotid Artery Ligation (BCAL) in a Dog: A Multimodal MRI Study. Front Vet Sci 2020; 7:580256. [PMID: 33195593 PMCID: PMC7533532 DOI: 10.3389/fvets.2020.580256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 08/17/2020] [Indexed: 11/13/2022] Open
Abstract
Bilateral carotid artery ligation has been reported as a lifesaving procedure to control severe hemorrhage. However, reports are sparse and little information is available regarding the potential risks associated with this procedure. We report an ischemic brain infarct as a complication after vascular surgery. A 3-year old, male intact border collie was presented for acute onset of forebrain signs 5 days after bilateral carotid artery ligation. Multimodal brain MRI including morphologic sequences, MR angiography, diffusion- and perfusion-weighted images were performed. MRI revealed a well-defined intra-axial lesion of the left caudate nucleus, with increased T2 and decreased T1 signal intensity and moderate heterogeneous peripheral contrast enhancement. The cerebral blood flow was reduced relative to the contralateral caudate nucleus. Images were consistent with a subacute lacunar ischemic infarct of the left striate artery. Additionally, multiple arterio-arterial anastomosis arising from the vertebral arteries were visible in the angiography sequences. Ischemic infarct due to thromboembolism should be considered as a possible complication associated with bilateral carotid artery ligation. Collateral blood supply can develop as early as 5 days after surgery.
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Affiliation(s)
- Lukas Komornik
- Department of Small Animal Surgery, Small Animal Clinic, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
| | - Ines Lautenschläger
- Department of Diagnostics and Clinical Services, Clinic for Diagnostic Imaging, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
| | - Alessio Vigani
- Department of Small Animal Emergency and Critical Care, Small Animal Clinic, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
| | - Claudia Iannucci
- Department of Small Animal Emergency and Critical Care, Small Animal Clinic, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
| | - Antonio Pozzi
- Department of Small Animal Surgery, Small Animal Clinic, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
| | - Adriano Wang-Leandro
- Department of Diagnostics and Clinical Services, Clinic for Diagnostic Imaging, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
| | - Katrin Beckmann
- Department of Neurology, Small Animal Clinic, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland
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Spinillo S, Golini L, Motta L. Brain MRI findings in a dog with late onset epileptic seizure after portosystemic shunt attenuation. VETERINARY RECORD CASE REPORTS 2020. [DOI: 10.1136/vetreccr-2020-001159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Simone Spinillo
- Department of NeurologyNorth West Veterinary SpecialistsRuncornCheshireUK
| | - Lorenzo Golini
- Veterinary Neurology and Neurosurgery ServiceClinica Veterinaria San MarcoVeggianoItaly
| | - Luca Motta
- Department of NeurologyNorth West Veterinary SpecialistsRuncornCheshireUK
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Liu J, Li S, Qian L, Xu X, Zhang Y, Cheng J, Zhang W. Effects of acute mild hypoxia on cerebral blood flow in pilots. Neurol Sci 2020; 42:673-680. [PMID: 32654008 DOI: 10.1007/s10072-020-04567-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Accepted: 07/02/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND Pilots often face and need to overcome a diverse range of unfavorable conditions, of which hypoxic exposure is the most common. Studies have reported that hypoxia can induce a decrease in cerebral blood flow (CBF) in the brains of both humans and animals. Hypoxia and the associated cerebral hemodynamic changes can contribute to cognitive performance deficits that may endanger flight safety and increase the risk of accidents. AIM In this study, we aimed to identify region-specific alterations in CBF in male pilots after exposure to hypoxia. MATERIAL AND METHODS We used 3D pseudo-continuous arterial spin labeling sequences in 35 healthy male pilots (mean age: 30.6 ± 4.82 years) under simulated hypoxic conditions with a 3.0-T magnetic resonance imaging scanner. The generated CBF maps were measured and averaged in several regions of interest. RESULTS Hypoxia decreased CBF in various brain regions, including the right temporal and bilateral occipital lobes, the anterior and posterior lobes of the cerebellum, the culmen and declive, and the inferior semilunar lobule of the cerebellum. CONCLUSION These changes may impact the functional activity of the brains of pilots experiencing hypoxia in flight, but the related mechanisms require further investigation.
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Affiliation(s)
- Jie Liu
- Department of MRI, The First Affiliated Hospital of Zhengzhou University, No.1 Jianshe Dong Road, Erqi District, Zhengzhou, Henan Province, China
| | - Shujian Li
- Department of MRI, The First Affiliated Hospital of Zhengzhou University, No.1 Jianshe Dong Road, Erqi District, Zhengzhou, Henan Province, China
| | - Long Qian
- GE Healthcare China, Floor 1, Yongchang North Road, Beijing Economic and Technological Development Zone, Beijing, China
| | - Xianrong Xu
- Department of Air Duty, The Air Force General Hospital in Beijing, No. 30 Fucheng Road, Haidian District, Beijing, West Diaoyutai, China
| | - Yong Zhang
- Department of MRI, The First Affiliated Hospital of Zhengzhou University, No.1 Jianshe Dong Road, Erqi District, Zhengzhou, Henan Province, China
| | - Jingliang Cheng
- Department of MRI, The First Affiliated Hospital of Zhengzhou University, No.1 Jianshe Dong Road, Erqi District, Zhengzhou, Henan Province, China.
| | - Wanshi Zhang
- Department of Radiology, The Air Force General Hospital in Beijing, No. 30 Fucheng Road, Haidian District, Beijing, West Diaoyutai, China
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Alisauskaite N, Wang-Leandro A, Dennler M, Kantyka M, Ringer SK, Steffen F, Beckmann K. Conventional and functional magnetic resonance imaging features of late subacute cortical laminar necrosis in a dog. J Vet Intern Med 2019; 33:1759-1765. [PMID: 31120629 PMCID: PMC6639491 DOI: 10.1111/jvim.15526] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 05/08/2019] [Indexed: 12/16/2022] Open
Abstract
Cerebral cortical laminar necrosis (CLN) is a consequence of severe hypoxic, ischemic, or hypoglycemic events. In humans, these cortical lesions show characteristic linear T1‐weighted (T1W) hyperintensity in the late subacute stage. Limited information reporting magnetic resonance imaging (MRI) findings in dogs affected by CLN is available. A 3‐year‐old Belgian Shepherd dog was referred 8 days after sudden onset of blindness after general anesthesia. Neurological examination showed central blindness and mild ataxia. Three‐Tesla MRI examination of the brain revealed bilateral asymmetrical areas of T2‐weighted hyperintensity within the occipital, parietal, temporal, and frontal cortex, involving gray and white matter. Furthermore, linear T1W‐hyperintense lesions were found in the cerebral cortex of the same areas and showed heterogeneous contrast enhancement. Perfusion‐weighted images revealed hyperperfusion in the affected regions. Lesions were compatible with subacute CLN with corresponding edema suspected to be secondary to anesthesia‐related brain hypoxia. Three‐Tesla MRI enabled identification of the laminar pattern of the cortical lesions.
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Affiliation(s)
- Neringa Alisauskaite
- Neurology Service, Department of Small Animal Surgery, Vetsuisse-Faculty Zurich, Zurich, Switzerland
| | - Adriano Wang-Leandro
- Clinic for Diagnostic Imaging, Department of Diagnostics and Clinical Services, Vetsuisse-Faculty Zurich, Zurich, Switzerland
| | - Matthias Dennler
- Clinic for Diagnostic Imaging, Department of Diagnostics and Clinical Services, Vetsuisse-Faculty Zurich, Zurich, Switzerland
| | - Marta Kantyka
- Clinic for Anesthesia, Department of Diagnostics and Clinical Services, Vetsuisse-Faculty Zurich, Zurich, Switzerland
| | - Simone K Ringer
- Clinic for Anesthesia, Department of Diagnostics and Clinical Services, Vetsuisse-Faculty Zurich, Zurich, Switzerland
| | - Frank Steffen
- Neurology Service, Department of Small Animal Surgery, Vetsuisse-Faculty Zurich, Zurich, Switzerland
| | - Katrin Beckmann
- Neurology Service, Department of Small Animal Surgery, Vetsuisse-Faculty Zurich, Zurich, Switzerland
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