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Li RHL, Fabella A, Nguyen N, Kaplan JL, Ontiveros E, Stern JA. Circulating neutrophil extracellular traps in cats with hypertrophic cardiomyopathy and cardiogenic arterial thromboembolism. J Vet Intern Med 2023; 37:490-502. [PMID: 36951591 DOI: 10.1111/jvim.16676] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 02/14/2023] [Indexed: 03/24/2023] Open
Abstract
BACKGROUND Cats with hypertrophic cardiomyopathy (HCM) are at risk of cardiogenic arterial thromboembolism (CATE). Neutrophil extracellular traps (NETs) may be a potential biomarker and therapeutic target for cardiomyopathy in cats. HYPOTHESIS/OBJECTIVES Characterize NETs in cats with HCM or CATE. We hypothesized that circulating NETs assessed in the form of cell-free DNA (cfDNA) and citrullinated histone H3 (citH3) are increased in cats with HCM and CATE and associated with reported predisposing factors for thrombus formation. ANIMALS Eighty-five cats including client-owned cats with HCM and CATE and staff- and student-owned clinically healthy cats without HCM. METHODS After echocardiographic evaluations, NETs were measured as cfDNA and citH3. RESULTS Cats with CATE had significant increases in cfDNA (11.2 ng/μL; interquartile range [IQR], 8.1 to 29.6) compared to those without HCM (8.2 ng/μL; IQR, 5.7 to 11.7 μL; P = .01) and were responsible for 75% to 83% of cases with cfDNA fragments sized 100 to 2000 base pairs. Citrullinated histone 3, detected in 52% of cats with HCM (31.1 ng/mL; IQR, 16.9 to 29.8), was significantly lower than in those with CATE (48.2 ng/mL; IQR, 34.2 to 60.2; P = .007). The citH3 concentrations correlated significantly with reported risk factors of CATE, such as left atrial auricular velocity. CONCLUSIONS AND CLINICAL IMPORTANCE Neutrophil extracellualr traps, especially citH3, are increased in cats with HCM and CATE. They may serve as a novel therapeutic target and biomarker of thrombosis in cats with HCM.
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Affiliation(s)
- Ronald H L Li
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Arianne Fabella
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Nghi Nguyen
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Joanna L Kaplan
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Eric Ontiveros
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Joshua A Stern
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
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Li RHL, Ontiveros E, Nguyen N, Stern JA, Lee E, Hardy BT. Precision medicine identifies a pathogenic variant of the ITGA2B gene responsible for Glanzmann's thrombasthenia in a cat. J Vet Intern Med 2020; 34:2438-2446. [PMID: 32935881 PMCID: PMC7694846 DOI: 10.1111/jvim.15886] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 05/04/2020] [Revised: 08/11/2020] [Accepted: 08/19/2020] [Indexed: 12/12/2022] Open
Abstract
Background A nonpedigreed male cat presented with epistaxis, severe bladder hemorrhage, and secondary urethral obstruction after cystocentesis. Objectives To characterize the phenotype of a cat with bleeding diathesis and use a precision medicine approach to identify the molecular genetic defect by whole genome sequencing. Methods Adenosine diphosphate (ADP) and arachidonic acid (AA)‐induced whole blood platelet aggregometry was performed in the affected cat and a healthy cat. Platelet activation, measured by P‐selectin expression, and surface integrin subunit β3 expression were evaluated by flow cytometry in the affected cat and healthy control. Total integrin subunit αIIb expression was assessed by western blot. Whole genome sequencing at 30× coverage was used to identify genetic variants that segregated in the affected cat compared to 194 cats from the 99 Lives Sequencing Consortium. Results Platelet aggregometry identified significant impairment in platelet aggregation in response to ADP and AA compared to the control cat. Targeted protein expression analyses by flow cytometry and immunoblot analysis determined that the surface expression and total expression of the integrin, αIIbβ3, was absent. Whole genome sequencing identified a homozygous c.1986delC frameshift variant in the integrin subunit αIIb (ITGA2B) gene that was not detected in the control population. The p.Pro662fs (ITGA2B P662X) variant terminates translation of the protein at the extracellular domain of the integrin prematurely, which is predicted to affect expression of the β3 unit. Conclusions and Clinical Importance This novel ITGA2B variant and the associated phenotype closely resemble Glanzmann's thrombasthenia, which has never been reported in cats.
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Affiliation(s)
- Ronald H L Li
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Eric Ontiveros
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Nghi Nguyen
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Joshua A Stern
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Elizabeth Lee
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Brian T Hardy
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
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Gunther-Harrington CT, Sharpe AN, Vernau KM, Ueda Y, Montgomery EA, Surmick JD, Fernandez N, Ontiveros E, Walker AL, Stern JA. Reference intervals for radiographic, echocardiographic and N-terminal pro B-type natriuretic peptide values in healthy kittens. J Feline Med Surg 2020; 23:293-301. [PMID: 32812464 DOI: 10.1177/1098612x20946461] [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] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Assessment of heart size in kittens is important, and there is a need for reference intervals (RIs) to prevent misinterpretation of cardiomegaly in this patient population. The purpose of this study was to generate RIs for echocardiographic and radiographic quantification of cardiac size in healthy kittens. METHODS In total, 88 kittens aged 6-16 weeks were enrolled in this study. Physical examination, and radiographic and echocardiographic evaluations were performed without sedation. Thoracic radiographs and echocardiographic images were measured to establish RIs for vertebral heart score (VHS), cardiac thoracic ratio (CTR) and multiple echocardiographic variables. N-terminal pro B-type natriuretic peptide (NT-proBNP) was measured. Statistical correlations between echocardiographic parameters and age, body weight and sex were all evaluated and RIs were generated. RESULTS Low-grade heart murmurs were appreciated in 26/88 kittens (29.5%). Kittens had a median VHS of 9.5 vertebrae (95% RI 8.0-10.9) and a median CTR of 67.2% (95% RI 54.4-79.8%). Measured NT-proBNP levels were comparable to healthy adult cats with a median of 31 pmol/l (upper reference limit 75 pmol/l). Multiple moderate-to-strong correlations between body weight and age with various echocardiographic parameters were observed and allometric scaling was performed for body weight. RIs for echocardiographic parameters were generated based on patient weight using allometric scaling formulas. Tricuspid valve regurgitation was a common finding and was present in 37.5% (n = 33) of the kittens. CONCLUSIONS AND RELEVANCE This study establishes RIs for thoracic radiograph assessment, echocardiography and cardiac biomarkers in kittens, which fills a critical gap in the veterinary literature. The VHS reported in this study is higher than previously reported for adult cats.
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Affiliation(s)
| | - Ashley N Sharpe
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Karen M Vernau
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Yu Ueda
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - Elizabeth A Montgomery
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Jennifer D Surmick
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Nicole Fernandez
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Eric Ontiveros
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Ashley L Walker
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - Joshua A Stern
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
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Duler L, Nguyen N, Ontiveros E, Li RHL. Identification of Neutrophil Extracellular Traps in Paraffin-Embedded Feline Arterial Thrombi using Immunofluorescence Microscopy. J Vis Exp 2020. [PMID: 32281975 DOI: 10.3791/60834] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Neutrophil extracellular traps (NETs), composed of cell-free DNA (cfDNA) and proteins like histones and neutrophil elastase (NE), are released by neutrophils in response to systemic inflammation or pathogens. Although NETs have previously been shown to augment clot formation and inhibit fibrinolysis in humans and dogs, the role of NETs in cats with cardiogenic arterial thromboembolism (CATE), a life-threatening complication secondary to hypertrophic cardiomyopathy, is unknown. A standardized method to identify and quantify NETs in cardiogenic arterial thrombi in cats will advance our understanding of their pathological role in CATE. Here, we describe a technique to identify NETs in formaldehyde-fixed and paraffin-embedded thrombi within the aortic bifurcation, extracted during necropsy. Following deparaffinization with xylene, aortic sections underwent indirect heat-induced antigen retrieval. Sections were then blocked, permeabilized, and ex vivo NETs were identified by colocalization of cell-free DNA (cfDNA), citrullinated histone H3 (citH3), and neutrophil elastase (NE) using immunofluorescence microscopy. To optimize the immunodetection of NETs in thrombi, autofluorescence of tissue elements was limited by using an autofluorescence quenching process prior to microscopy. This technique could be a useful tool to study NETs and thrombosis in other species and offers new insights into the pathophysiology of this complex condition.
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Affiliation(s)
- Laetitia Duler
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis
| | - Nghi Nguyen
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis
| | - Eric Ontiveros
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis
| | - Ronald H L Li
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis;
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Duler L, Nguyen N, Ontiveros E, Li RHL. Identification of Neutrophil Extracellular Traps in Paraffin-Embedded Feline Arterial Thrombi using Immunofluorescence Microscopy. J Vis Exp 2020. [PMID: 32281975 DOI: 10.3791/60834.] [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] [Subscribe] [Scholar Register] [Indexed: 09/26/2022]
Abstract
Neutrophil extracellular traps (NETs), composed of cell-free DNA (cfDNA) and proteins like histones and neutrophil elastase (NE), are released by neutrophils in response to systemic inflammation or pathogens. Although NETs have previously been shown to augment clot formation and inhibit fibrinolysis in humans and dogs, the role of NETs in cats with cardiogenic arterial thromboembolism (CATE), a life-threatening complication secondary to hypertrophic cardiomyopathy, is unknown. A standardized method to identify and quantify NETs in cardiogenic arterial thrombi in cats will advance our understanding of their pathological role in CATE. Here, we describe a technique to identify NETs in formaldehyde-fixed and paraffin-embedded thrombi within the aortic bifurcation, extracted during necropsy. Following deparaffinization with xylene, aortic sections underwent indirect heat-induced antigen retrieval. Sections were then blocked, permeabilized, and ex vivo NETs were identified by colocalization of cell-free DNA (cfDNA), citrullinated histone H3 (citH3), and neutrophil elastase (NE) using immunofluorescence microscopy. To optimize the immunodetection of NETs in thrombi, autofluorescence of tissue elements was limited by using an autofluorescence quenching process prior to microscopy. This technique could be a useful tool to study NETs and thrombosis in other species and offers new insights into the pathophysiology of this complex condition.
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Affiliation(s)
- Laetitia Duler
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis
| | - Nghi Nguyen
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis
| | - Eric Ontiveros
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis
| | - Ronald H L Li
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis;
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Kaplan JL, Stern JA, Fascetti AJ, Larsen JA, Skolnik H, Peddle GD, Kienle RD, Waxman A, Cocchiaro M, Gunther-Harrington CT, Klose T, LaFauci K, Lefbom B, Lamy MM, Malakoff R, Nishimura S, Oldach M, Rosenthal S, Stauthammer C, O'Sullivan L, Visser LC, Williams R, Ontiveros E. Correction: Taurine deficiency and dilated cardiomyopathy in golden retrievers fed commercial diets. PLoS One 2018; 13:e0210233. [PMID: 30596785 PMCID: PMC6312369 DOI: 10.1371/journal.pone.0210233] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
[This corrects the article DOI: 10.1371/journal.pone.0209112.].
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Kaplan JL, Stern JA, Fascetti AJ, Larsen JA, Skolnik H, Peddle GD, Kienle RD, Waxman A, Cocchiaro M, Gunther-Harrington CT, Klose T, LaFauci K, Lefbom B, Machen Lamy M, Malakoff R, Nishimura S, Oldach M, Rosenthal S, Stauthammer C, O’Sullivan L, Visser LC, William R, Ontiveros E. Taurine deficiency and dilated cardiomyopathy in golden retrievers fed commercial diets. PLoS One 2018; 13:e0209112. [PMID: 30543707 PMCID: PMC6292607 DOI: 10.1371/journal.pone.0209112] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [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: 08/28/2018] [Accepted: 11/29/2018] [Indexed: 12/24/2022] Open
Abstract
INTRODUCTION Golden retrievers are over-represented in cases of taurine-deficient dilated cardiomyopathy and recently a surge in cases has prompted further investigation. OBJECTIVE To describe the clinical, dietary, and echocardiographic features in golden retrievers diagnosed with taurine deficiency and dilated cardiomyopathy, and to determine specific dietary associations. A second aim was to determine the whole blood taurine concentrations in a representative sample of healthy golden retrievers. ANIMALS Twenty-four client-owned golden retrievers with documented taurine deficiency and dilated cardiomyopathy and 52 healthy client-owned golden retrievers. METHODS In this multicenter prospective observational study, baseline and follow-up echocardiographic data, complete diet and medical histories, and whole blood, plasma, or serum taurine concentrations were obtained. Baseline and follow-up echocardiographic data were compared. Associations were evaluated between specific diets and taurine deficiency or congestive heart failure. The prevalence of low whole blood taurine concentrations in the healthy golden retrievers was calculated. RESULTS Twenty-three of 24 dogs diagnosed with taurine deficiency and dilated cardiomyopathy were fed diets that were either grain-free, legume-rich, or a combination of these factors. None of these diets were feeding trial tested using Association of American Feed Control Officials (AAFCO) procedures. Twenty-three of 24 dogs had significant improvement in their echocardiographic parameters and normalization of taurine concentrations following diet change and taurine supplementation. Nine of 11 dogs diagnosed with congestive heart failure (CHF) had resolution of their congestion at follow-up with five no longer requiring diuretic therapy and four tolerating diuretic dose reduction by >50%. CONCLUSIONS Certain diets and diet characteristics were associated with the development of taurine deficiency. Taurine deficiency and dilated cardiomyopathy in golden retrievers is likely multifactorial, including a combination of dietary, metabolic, and genetic factors.
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Affiliation(s)
- Joanna L. Kaplan
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Joshua A. Stern
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
- * E-mail:
| | - Andrea J. Fascetti
- Department of Molecular Biosciences, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Jennifer A. Larsen
- Department of Molecular Biosciences, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Hannah Skolnik
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Gordon D. Peddle
- Animal Emergency & Referral Associates, Fairfield, New Jersey, United States of America
| | - Richard D. Kienle
- Mission Valley Veterinary Cardiology, Gilroy, California, United States of America
| | - Andrew Waxman
- SAGE Centers for Veterinary Specialty and Emergency Care, Dublin, California, United States of America
| | - Michael Cocchiaro
- Veterinary Specialty Hospital of the Carolinas, Durham, North Carolina, United States of America
| | - Catherine T. Gunther-Harrington
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Tyler Klose
- Lakeshore Veterinary Specialists, Glendale, Wisconsin, United States of America
| | - Kendra LaFauci
- CVCA Cardiac Care for Pets Annapolis, Annapolis, Maryland, United States of America
| | - Bonnie Lefbom
- The Regional Veterinary Referral Center, CVCA Cardiac Care for Pets, Springfield, Virginia, United States of America
| | - Maggie Machen Lamy
- Veterinary Cardiopulmonary Care Center, West Palm Beach, Florida, United States of America
| | - Rebecca Malakoff
- MSPCA Angell West, Waltham, Massachusetts, United States of America
| | - Satoko Nishimura
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Maureen Oldach
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Steven Rosenthal
- CVCA Cardiac Care for Pets, Towson, Maryland, United States of America
| | - Christopher Stauthammer
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine University of Minnesota, St. Paul, Minnesota, United States of America
| | - Lynne O’Sullivan
- Department of Companion Animals, Atlantic Veterinary College University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Lance C. Visser
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
| | - Regan William
- Veterinary Emergency Clinic, Toronto, Ontario, Canada
| | - Eric Ontiveros
- Department of Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, Davis, California, United States of America
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Gunther-Harrington CT, Arthur R, Estell K, Martinez Lopez B, Sinnott A, Ontiveros E, Varga A, Stern JA. Prospective pre- and post-race evaluation of biochemical, electrophysiologic, and echocardiographic indices in 30 racing thoroughbred horses that received furosemide. BMC Vet Res 2018; 14:18. [PMID: 29347921 PMCID: PMC5774161 DOI: 10.1186/s12917-018-1336-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 09/11/2017] [Accepted: 01/04/2018] [Indexed: 11/23/2022] Open
Abstract
Background Exercise induced cardiac fatigue (EICF) and cardiac dysrhythmias are well described conditions identified in high-level human athletes that increase in frequency with intensity and duration of exercise. Identification of these conditions requires an understanding of normal pre- and post-race cardiac assessment values. The objectives of this study were to (1) characterize selected indices of cardiac function, electrophysiologic parameters, and biochemical markers of heart dysfunction prior to and immediately after high level racing in Thoroughbred horses receiving furosemide; and (2) create pre- and post-race reference values in order to make recommendations on possible screening practices for this population in the future. Results Thirty Thoroughbred horses were enrolled in the study with an age range of 3–6 years. All horses received furosemide prior to racing. Physical exams, ECGs, and echocardiograms were performed prior to racing (T0) and within 30–60 min following the race (T1). Blood samples were obtained at T0, T1, 4 h post-race (T4) and 24 h after the race (T24). Electrolytes, hematocrit, cardiac troponin I, and partial pressure CO2 values were obtained at all time points. Heart rate was significantly increased post-race compared to baseline value with a median difference of 49 bpm, 95% CI [31,58],(P < 0.0001). No dysrhythmias were noted during ECG assessment. Following the race, an increase in number of horses demonstrating regurgitation through the aorta and AV valves was noted. Systolic function measured by fractional shortening increased significantly with a mean difference of 7.9%, 95% CI [4.8, 10.9], (P < 0.0001). Cardiac troponin I was not different at pre- and immediately post-race time points, but was significantly increased at T4 (P < 0.001). Troponin returned to baseline value by T24. Conclusions This study utilized a before and after study design where each horse served as its own control, as such the possible effect of regression to the mean cannot be ruled out. The reference intervals generated in this study may be used to identify selected echocardiographic and electrocardiographic abnormalities in racing horses receiving furosemide.
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Affiliation(s)
- Catherine T Gunther-Harrington
- Department of Medicine & Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616, USA
| | - Rick Arthur
- School of Veterinary Medicine, University of California Davis, Davis, CA, 95616, USA
| | - Krista Estell
- William R. Pritchard Veterinary Medical Teaching Hospital (VMTH), University of California Davis, Davis, CA, 95616, USA.,Present Address: Marion duPont Scott Equine Medical Center, Virginia-Maryland College of Veterinary Medicine, Leesburg, VA, 20176, USA
| | - Beatriz Martinez Lopez
- Center for Animal Disease Modeling And Surveillance (CADMS), Department of Medicine & Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616, USA
| | - Alexandra Sinnott
- Department of Medicine & Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616, USA
| | - Eric Ontiveros
- Department of Medicine & Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616, USA
| | - Anita Varga
- William R. Pritchard Veterinary Medical Teaching Hospital (VMTH), University of California Davis, Davis, CA, 95616, USA.,Present Address: Gold Coast Veterinary Service & Consulting, Esparto, CA, 95627, USA
| | - Joshua A Stern
- Department of Medicine & Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616, USA.
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Ontiveros E, Kuo L, Masters P, Perlman S. Analysis of nonessential gene function in recombinant MHV-JHM. Gene 4 knockout recombinant virus. Adv Exp Med Biol 2002; 494:83-9. [PMID: 11774550 DOI: 10.1007/978-1-4615-1325-4_13] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- E Ontiveros
- Interdisciplinary Program in Immunology, University of Iowa, Iowa City, Iowa 52242, USA
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Ontiveros E, Kuo L, Masters PS, Perlman S. Inactivation of expression of gene 4 of mouse hepatitis virus strain JHM does not affect virulence in the murine CNS. Virology 2001; 289:230-8. [PMID: 11689046 DOI: 10.1006/viro.2001.1167] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The protein encoded by ORF 4 of mouse hepatitis virus (MHV) is not required for growth of some strains in tissue culture cells, but its role in pathogenesis in the murine host has not been defined previously in a controlled manner. MHV strain JHM causes acute and chronic neurological diseases in susceptible strains of rodents. To genetically manipulate the structural proteins of this and other strains of MHV, we have generalized an interspecies-targeted RNA recombination selection that was originally developed for the A59 strain of MHV. Using this approach, a recombinant MHV-JHM was constructed in which gene 4 was genetically inactivated. Virus lacking gene 4 expression replicated in tissue culture cells with similar kinetics to recombinant virus in which gene 4 expression was not disrupted. Both types of viruses exhibited similar virulence when analyzed in a murine model of encephalitis. These results establish a targeted recombination system for inserting mutations into MHV-JHM. Furthermore, the protein encoded by ORF 4 is not essential for growth in tissue culture cells or in the CNS of the infected host.
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Affiliation(s)
- E Ontiveros
- Interdisciplinary Program in Immunology, University of Iowa, Iowa City, Iowa 52242, USA
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Shor Pinsker V, López García R, Karchmer S, Ontiveros E. [Drug addiction and pregnancy]. Ginecol Obstet Mex 1976; 39:151-68. [PMID: 944157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Karchimer S, Ontiveros E, López García R. [Placental function and pharmacological stress on the fetus]. Ginecol Obstet Mex 1971; 30:387-401. [PMID: 5138008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Shor V, Santos J, Ontiveros E, Wulfovich M, Karchmer S. [Effects of weight, height, age and parity on the pregnancy, puerperium and the status of the newborn infant]. Ginecol Obstet Mex 1971; 29:463-9. [PMID: 5091931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Karchmer S, Ontiveros E, Shor V. [Maternal nutrition and its effects on fetal nutrition]. Ginecol Obstet Mex 1971; 29:471-82. [PMID: 5091932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Sentíes L, Arellano G, Casellas A, Ontiveros E, Santos J. Effects of some vasopressor drugs upon uterine contractility in pregnant women. Am J Obstet Gynecol 1970; 107:892-7. [PMID: 4913842 DOI: 10.1016/s0002-9378(16)34042-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Karchmer S, Ontiveros E, Shor V, Almaraz R. [Deglutition in the anencephalus fetus in utero]. Ginecol Obstet Mex 1969; 24:489-96. [PMID: 5347654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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MacGregor C, Ontiveros E, Vargas E, Valenzuela S. Hydatidiform mole. Analysis of 145 patients. Obstet Gynecol 1969; 33:343-51. [PMID: 5776082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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18
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Karchmer S, Shor V, Perdomo-de la Sierra A, Eisenberg de Smoler P, Ontiveros E, Barrón-Vega R. [Value of amniography in the study of chronic fetal distress. Correlation with the fetal electrocardiogram]. GAC MED MEX 1968; 98:1299-310. [PMID: 5731750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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19
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Karchmer S, Shor V, Ontiveros E. [Study of electrolytes of the amniotic fluid in pregnancy texemia. Analogy of the mother's blood and the fetus]. Ginecol Obstet Mex 1968; 24:71-8. [PMID: 5667611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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20
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Mac Gregor C, Ontiveros E, Vargas López E, Castelazo Ayala L. [Statistical analysis of molar pregnancy in the Hospital de Gineco-Obstetricia, No. 1, of the I.M.S.S]. Ginecol Obstet Mex 1966; 21:611-8. [PMID: 5994068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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21
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Ontiveros E, Vargas López E, MacGregor C. [Results of long-term follow-up after molar abortion]. Ginecol Obstet Mex 1966; 21:603-10. [PMID: 6011620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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22
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Castelazo Ayala L, Karchmer S, Maqueo M, Ontiveros E. [Hemorrhage due to placental alterations in advanced pregnancy and in the puerperium]. CIR CIR 1964; 37:394-420. [PMID: 5316961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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