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Benson JM, Wang G, Hutt JA, Wu G, Kaminsky SM, Cram S, Barur R, Donahue JK. Preclinical safety and biodistribution assessment of Ad-KCNH2-G628S administered via atrial painting in New Zealand white rabbits. Basic Clin Pharmacol Toxicol 2023; 133:179-193. [PMID: 37177881 PMCID: PMC10935599 DOI: 10.1111/bcpt.13885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 04/27/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023]
Abstract
Post-operative atrial fibrillation (POAF) is the most common complication after cardiac surgery. Despite implementation of several pharmacological strategies, incidence of POAF remains at approximately 30%. An adenovirus vector encoding KCNH2-G628S has proven efficacious in a porcine model of AF. In this preclinical study, 1.5 × 1010 or 1.5 × 1012 Ad-KCNH2-G628S vector particles (vp) were applied to the atrial epicardium or 1.5 × 1012 vp were applied to the whole epicardial surface of New Zealand White rabbits. Saline and vector vehicle served as procedure controls. Animals were followed for up to 42 days. Vector genomes persisted in the atria up to 42 days, with no distribution to extra-thoracic organs. There were no adverse effects attributable to test article on standard toxicological endpoints or on blood pressure, left atrial or ventricular ejection fractions, electrocardiographic parameters, or serum IL-6 or troponin concentrations. Mononuclear infiltration of the myocardium of the atrial free walls of low-dose, but not high-dose animals was observed at 7 and 21 days, but these changes did not persist or affect cardiac function. After scaling for heart size, results indicate the test article is safe at doses up to 25 times the maximum proposed for the human clinical trial.
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Affiliation(s)
- Janet M. Benson
- Applied Toxicology Program, Lovelace Biomedical Research Institute, Albuquerque, NM 87108, USA
| | - Gensheng Wang
- Applied Toxicology Program, Lovelace Biomedical Research Institute, Albuquerque, NM 87108, USA
- Baxter International, Inc. Deerfield, IL 60015, USA
| | - Julie A. Hutt
- Greenfield Pathology Services, Inc., Greenfield, IN 46140, USA
| | - Guodong Wu
- Applied Toxicology Program, Lovelace Biomedical Research Institute, Albuquerque, NM 87108, USA
| | - Stephen M. Kaminsky
- Weill Cornell Medicine, Belfer Gene Therapy Core Facility, New York, NY 10021, USA
| | - Sara Cram
- Weill Cornell Medicine, Belfer Gene Therapy Core Facility, New York, NY 10021, USA
| | - Rajeshkumar Barur
- Cardiovascular Medicine, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA
| | - J. Kevin Donahue
- Cardiovascular Medicine, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA
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Jekl V, Agudelo CF, Hauptman K. Cardiology in Rodents, Rabbits, and Small Exotic Mammals-Diagnostic Workup. Vet Clin North Am Exot Anim Pract 2022; 25:503-524. [PMID: 35422264 DOI: 10.1016/j.cvex.2022.01.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The incidence of cardiac diseases in pet rabbits and rodents increased over the past decade as these species live longer and diagnostics methods are more precise to diagnose heart diseases even in small-sized animals. The article summarizes diagnostics of cardiac diseases in selected exotic companion mammals, particularly in rabbits, guinea pigs, chinchillas, and rats. The emphasis of the paper is given on clinical examination, thoracic radiography, electrocardiography, and echocardiography.
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Affiliation(s)
- Vladimir Jekl
- Jekl and Hauptman Veterinary Clinic - Focused on Exotic Companion Mammal Care, Mojmirovo Namesti 3105/6a, Brno 61200, Czech Republic; Department of Pharmacology and Pharmacy, Faculty of Veterinary Medicine, VETUNI Brno, Palackeho Tr. 1946/1, Brno 61242, Czech Republic.
| | - Carlos F Agudelo
- Dogs and Cat Clinic, Faculty of Veterinary Medicine, VETUNI Brno, Palackeho Tr. 1946/1, Brno 61242, Czech Republic
| | - Karel Hauptman
- Jekl and Hauptman Veterinary Clinic - Focused on Exotic Companion Mammal Care, Mojmirovo Namesti 3105/6a, Brno 61200, Czech Republic
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Ozawa SM, Guzman DSM, Hawkins MG, Diao SM, Masri AE, Gunther-Harrington CT, Knych HK. Pharmacokinetics of pimobendan following oral administration to New Zealand White rabbits (Oryctolagus cuniculus). Am J Vet Res 2022; 83:356-363. [PMID: 35038306 DOI: 10.2460/ajvr.21.03.0032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the pharmacokinetics and potential adverse effects of pimobendan after oral administration in New Zealand White rabbits (Ocytolagus cuniculi). ANIMALS 10 adult sexually intact (5 males and 5 females) rabbits. PROCEDURES 2 pilot studies were performed with a pimobendan suspension or oral tablets. Eight rabbits received 7.5 mg of pimobendan (mean 2.08 mg/kg) suspended in a critical care feeding formula. Plasma concentrations of pimobendan and O-demethylpimobendan (ODMP) were measured, and pharmacokinetic parameters were calculated for pimobendan by noncompartmental analysis. Body weight, food and water consumption, mentation, urine, and fecal output were monitored. RESULTS Mean ± SD maximum concentration following pimobendan administration was 15.7 ± 7.54 ng/mL and was detected at 2.79 ± 1.25 hours. The half-life was 3.54 ± 1.32 hours. Plasma concentrations of pimobendan were detectable for up to 24 hours. The active metabolite, ODMP, was detected in rabbits for 24 to 36 hours. An adverse event occurred following administration of pimobendan in tablet form in 1 pilot study, resulting in death secondary to aspiration. No other adverse events occurred. CLINICAL RELEVANCE Plasma concentrations of pimobendan were lower than previously reported for dogs and cats, despite administration of higher doses, and had longer time to maximum concentration and half-life. Based on this study, 2 mg/kg of pimobendan in a critical care feeding formulation should maintain above a target plasma concentration for 12 to 24 hours. However, further studies evaluating multiple-dose administration as well as pharmacodynamic studies and clinical trials in rabbits with congestive heart failure are needed to determine accurate dose and frequency recommendations.
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Affiliation(s)
- Sarah M Ozawa
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raliegh, NC
| | | | - Michelle G Hawkins
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Stephanie M Diao
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raliegh, NC
| | - Acacia E Masri
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raliegh, NC
| | | | - Heather K Knych
- K. L. Maddy Equine Analytical Pharmacology Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA
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Ozawa S, Guzman DSM, Keel K, Gunther-Harrington C. Clinical and pathological findings in rabbits with cardiovascular disease: 59 cases (2001-2018). J Am Vet Med Assoc 2021; 259:764-776. [PMID: 34516264 DOI: 10.2460/javma.259.7.764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine epidemiological features of cardiovascular disease in rabbits examined at a veterinary teaching hospital and characterize clinical and pathological findings. ANIMALS 59 rabbits. PROCEDURES Medical records from 2001 to 2018 were reviewed, and data were collected. Echocardiographic images and histologic diagnoses were reviewed. RESULTS The prevalence of cardiovascular disease was 2.6% (59/2,249). Clinical signs related to cardiac disease included heart murmur (n = 25 rabbits), arrhythmia (22), tachypnea or dyspnea (13), hyporexia or anorexia (13), and muscle wasting (9). Radiographic (n = 39) abnormalities included cardiomegaly (19) and peritoneal (12) and pleural (11) effusion. Common echocardiographic (n = 37) diagnoses included degenerative valve disease (15), dilated cardiomyopathy (7), unclassified cardiomyopathy (4), restrictive cardiomyopathy (3), and hypertrophic cardiomyopathy (2). On ECG (n = 19), supraventricular arrhythmias (16) were more common than ventricular arrhythmias (12). Thirty-five necropsy reports were available, and diagnoses included cardiomyopathy (n = 14), myocarditis (10), and arteriosclerosis (9). Medical management (n = 20) included a wide range of drugs and dosages with few adverse effects. Survival times (n = 36 rabbits) ranged from 1 to 2,353 days with a median cardiac disease-specific survival time of 306 days. CONCLUSIONS AND CLINICAL RELEVANCE The findings provided information on the prevalence of cardiovascular disease in rabbits and survival times for affected rabbits. Right-sided, left-sided, and biventricular congestive heart failure occurred equally. Median survival time was lower than that reported for other species. Further research on the diagnosis and treatment of cardiovascular disease in rabbits is needed.
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De Silva M, Bo P, Dora Genocchi E, Tagliavia C, Roccaro M, Grandis A, Baron Toaldo M. Radiographic and anatomical morphometric assessments of heart size in presumed healthy pet guinea pigs. Vet Radiol Ultrasound 2021; 63:8-17. [PMID: 34528738 PMCID: PMC9292407 DOI: 10.1111/vru.13020] [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: 01/16/2021] [Revised: 06/25/2021] [Accepted: 06/29/2021] [Indexed: 11/29/2022] Open
Abstract
Cardiac disease in guinea pigs has been reported in the literature; however, reference intervals for normal radiographic heart size obtained using objective measurement methods have not been provided for this species. The aim of this prospective, reference interval study was to describe cardiac dimensions in presumed healthy guinea pigs using the vertebral heart scale (VHS) from thoracic radiographs, as described for dogs and cats. Furthermore, an anatomical study was carried out to compare the radiographic and anatomical findings. Thoracic radiographs were acquired in right lateral recumbency for 30, client‐owned, conscious, presumed healthy guinea pigs and radiographs were acquired in left lateral recumbency for 10 presumed healthy guinea pigs as comparisons. The influence of sex, age, body weight (BW), and recumbency on the VHS and absolute cardiac measurements was investigated. The median (interquartile range; IQR) VHS was 7.4 (7.1‐7.6). No differences emerged between the VHS measured in right versus left lateral recumbency (P = .41) or between sexes (P = .16). The VHS values were not influenced by age (P = .53) or BW (P = .26). The anatomical study was carried out on 10 guinea pig cadavers, and in situ and ex situ cardiac measurements were taken using a caliper. A median (IQR) 7.5 (7.2‐8.0) VHS was assessed by this anatomical study. The reference intervals provided should be useful tools in the future for the radiographic interpretation of cardiac size in guinea pigs in clinical practice.
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Affiliation(s)
- Margherita De Silva
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, Italy
| | | | | | - Claudio Tagliavia
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, Italy
| | - Mariana Roccaro
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, Italy
| | - Annamaria Grandis
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, Bologna, Italy
| | - Marco Baron Toaldo
- Department for Small Animals, Division of Cardiology, Clinic for Small Animal Internal Medicine, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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Tagirova Sirenko S, Tsutsui K, Tarasov KV, Yang D, Wirth AN, Maltsev VA, Ziman BD, Yaniv Y, Lakatta EG. Self-Similar Synchronization of Calcium and Membrane Potential Transitions During Action Potential Cycles Predict Heart Rate Across Species. JACC Clin Electrophysiol 2021; 7:1331-1344. [PMID: 33933406 PMCID: PMC10089231 DOI: 10.1016/j.jacep.2021.02.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 02/23/2021] [Accepted: 02/25/2021] [Indexed: 01/23/2023]
Abstract
OBJECTIVES The purpose of this study was to discover regulatory universal mechanisms of normal automaticity in sinoatrial nodal (SAN) pacemaker cells that are self-similar across species. BACKGROUND Translation of knowledge of SAN automaticity gleaned from animal studies to human dysrhythmias (e.g., "sick sinus" syndrome [SSS]) requiring electronic pacemaker insertion has been suboptimal, largely because heart rate varies widely across species. METHODS Subcellular Ca2+ releases, whole cell action potential (AP)-induced Ca2+ transients, and APs were recorded in isolated mouse, guinea pig, rabbit, and human SAN cells. Ca2+-Vm kinetic parameters during phases of AP cycles from their ignition to recovery were quantified. RESULTS Although both action potential cycle lengths (APCLs) and Ca2+-Vm kinetic parameters during AP cycles differed across species by 10-fold, trans-species scaling of these during AP cycles and scaling of these to APCL in cells in vitro, electrocardiogram RR intervals in vivo, and body mass (BM) were self-similar (obeyed power laws) across species. Thus, APCL in vitro, heart rate in vivo, and BM of any species can be predicted by Ca2+-Vm kinetics during AP cycles in SAN cells measured in any single species in vitro. CONCLUSIONS In designing optimal heart rate to match widely different BM and energy requirements from mice to humans, nature did not "reinvent pacemaker cell wheels," but differentially scaled kinetics of gears that regulate the rates at which the "wheels spin." This discovery will facilitate the development of novel pharmacological and biological pacemakers featuring a normal, wide-range rate regulation in animal models and the translation of these to humans to target recalcitrant human SSS.
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Affiliation(s)
- Syevda Tagirova Sirenko
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA.
| | - Kenta Tsutsui
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA; Saitama International Medical Center, Saitama, Japan
| | - Kirill V Tarasov
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA
| | - Dongmei Yang
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA
| | - Ashley N Wirth
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA
| | - Victor A Maltsev
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA
| | - Bruce D Ziman
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA
| | - Yael Yaniv
- Biomedical Engineering Faculty, Technion-IIT, Haifa, Israel
| | - Edward G Lakatta
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institute of Health, Baltimore, Maryland, USA.
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Dias S, Anselmi C, Espada Y, Martorell J. Vertebral heart score to evaluate cardiac size in thoracic radiographs of 124 healthy rats (Rattus norvegicus). Vet Radiol Ultrasound 2021; 62:394-401. [PMID: 33821524 DOI: 10.1111/vru.12973] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 01/30/2021] [Accepted: 02/09/2021] [Indexed: 12/01/2022] Open
Abstract
Dilated cardiomyopathy is a relatively common disease in pet rats (Rattus norvegicus); however, there is a lack of radiographic references for the normal cardiac size in this species. The aim of this prospective, anatomical and reference interval study was to establish quantitative radiographic reference range measurements for the vertebral heart score (VHS) in rats. Right lateral (RL), ventrodorsal (VD), and dorsoventral (DV) radiographs of clinically healthy rats (n = 124) were evaluated. Measurements were performed by 2 expert readers who were unaware of signalment data. The mean values and references intervals of VHS were 7.7 and 7.0-8.5 for the RL, 7.5 and 6.6-8.6 for the VD, and 7.9 and 6.9-9.0 for the DV, with VHS values greater in males than in females. The measurements reported in this study can be used by the clinician as an objective tool to evaluate cardiac size in rats, in order to improve the diagnosis and treatment of cardiac diseases.
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Affiliation(s)
- Sara Dias
- Hospital Clínic Veterinari - UAB, Bellaterra, Barcelona, Spain.,Present address: Sara Dias, Pride Veterinary Centre - Referral Hospital and Nottingham University, UK
| | - Carlo Anselmi
- Hospital Clínic Veterinari - UAB, Bellaterra, Barcelona, Spain
| | - Yvonne Espada
- Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Jaume Martorell
- Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
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Marques AEGW, Marques MG, Silveira BCR, Oliveira SP, Ferraz IG, Ventricci ABG, Silva NC, Nagata WB, Floriano BP, Ferreira WL, Santos PSP. Lidocaine administered at a continuous rate infusion does not impair left ventricular systolic and diastolic function of healthy rabbits sedated with midazolam. Vet Anim Sci 2020; 10:100151. [PMID: 33117910 PMCID: PMC7581963 DOI: 10.1016/j.vas.2020.100151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 08/18/2020] [Accepted: 09/30/2020] [Indexed: 11/25/2022] Open
Abstract
Lidocaine is a versatile drug that not only provides local anesthesia, but also reduces anesthetic requirements of other agents and has antiarrhythmic, pro-kinetic, anti-inflammatory, antiendotoxemic and antioxidant effects. As it is a drug commonly used in critically ill patients, its safety from the cardiovascular system should be ensured. The aim of this study was to determine the effects of a continuous rate infusion (CRI) of lidocaine on left ventricular systolic and diastolic function of healthy rabbits sedated with midazolam by use of transthoracic echocardiography. Ten New Zealand healthy rabbits were sedated with intramuscular midazolam (1 mg/kg) and enrolled in two experimental treatments (control or lidocaine). The control treatment (CT) comprised an intravenous bolus of 0.9% sodium chloride (0.05 mL/kg) followed by CRI at 5 mL/h, whereas the lidocaine treatment (LT) comprised a bolus of 2% lidocaine without epinephrine at 1 mg/kg followed by CRI at 50 µg/kg/minute. Echocardiographic and hemodynamic variables were studied. Variables were recorded at baseline (TB) and 20, 40 and 60 minutes following start of CRI (T20, T40 and T60, respectively). No differences were found between treatments. The results of this study demonstrate that a continuous rate infusion of lidocaine at 50 µg/kg/minute does not impair echocardiographic indices of left ventricular systolic and diastolic function of healthy rabbits sedated with midazolam.
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Affiliation(s)
- A E G W Marques
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - M G Marques
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil.,Department of Veterinary Medicine, University Center of the Integrated Colleges of Ourinhos (UniFio), BR 153, Km 338+420m, 19909-100, Ourinhos, São Paulo State, Brazil
| | - B C R Silveira
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - S P Oliveira
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - I G Ferraz
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - A B G Ventricci
- Department of Veterinary Medicine, University Center of the Integrated Colleges of Ourinhos (UniFio), BR 153, Km 338+420m, 19909-100, Ourinhos, São Paulo State, Brazil
| | - N C Silva
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - W B Nagata
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - B P Floriano
- Department of Veterinary Medicine, University Center of the Integrated Colleges of Ourinhos (UniFio), BR 153, Km 338+420m, 19909-100, Ourinhos, São Paulo State, Brazil
| | - W L Ferreira
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
| | - P S P Santos
- Department of Animal Clinic, Surgery and Reproduction, São Paulo State University (UNESP), School of Veterinary Medicine, 793 Clovis Pestana st., 16050-680, Araçatuba, São Paulo State, Brazil
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Cardiovascular effects of increasing dosages of norepinephrine in healthy isoflurane-anesthetized New Zealand White rabbits. Vet Anaesth Analg 2020; 47:781-788. [PMID: 32826161 DOI: 10.1016/j.vaa.2020.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 06/29/2020] [Accepted: 07/01/2020] [Indexed: 01/29/2023]
Abstract
OBJECTIVE To characterize the cardiovascular effects of increasing dosages of norepinephrine (NE) in healthy isoflurane-anesthetized rabbits. STUDY DESIGN Prospective experimental study. ANIMALS A total of nine female ovariohysterectomized New Zealand White rabbits weighing 3.4 ± 0.2 kg (mean ± standard deviation). METHODS Rabbits were premedicated intramuscularly with buprenorphine (0.05 mg kg-1) and midazolam (0.5 mg kg-1). Anesthesia was induced with intravenous propofol and maintained with a 1.1 × minimum alveolar concentration of isoflurane for this species to induce hypotension. Rabbits were administered NE infusions at three doses: low, 0.1 μg kg-1 minute-1; medium, 0.5 μg kg-1 minute-1; and high doses, 1 μg kg-1 minute-1 for 10 minutes each in that order. Cardiovascular variables including heart rate (HR), cardiac output (CO) by lithium dilution technique and systolic (SAP), mean (MAP) and diastolic (DAP) invasive arterial blood pressures measured in the auricular artery were recorded at baseline, 10 minutes after the start of the infusion of each NE treatment and 10 minutes after NE was discontinued. A linear mixed model and a type III anova with Tukey's post hoc comparison was performed (p < 0.05). RESULTS Significant increases in SAP (28% and 90%), MAP (27% and 90%) and DAP (33% and 97%) were measured with medium and high dose treatments, respectively (p < 0.001), with no changes in CO. HR decreased and stroke volume increased significantly with high dose treatment (by 17% and 15%, respectively; p < 0.05). No arrhythmias were noticed with NE treatments. CONCLUSIONS AND CLINICAL RELEVANCE The infusion of NE at 0.5-1.0 μg kg-1 minute-1 is a potentially effective treatment for hypotension in healthy isoflurane-anesthetized New Zealand White rabbits.
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Yang CC, Lin SL, Chan IP. Contrast echocardiography for detecting bidirectional shunting in a rabbit with an atrial septal defect. J Exot Pet Med 2020. [DOI: 10.1053/j.jepm.2020.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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TRANSTHORACIC ECHOCARDIOGRAPHY IN NONSEDATED, FREE-RANGING HEALTHY AGOUTIS ( DASYPROCTA AZARAE). J Zoo Wildl Med 2020; 50:903-909. [PMID: 31926522 DOI: 10.1638/2018-0153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/30/2019] [Indexed: 11/21/2022] Open
Abstract
Most of the agouti species are kept in captivity, including the species Dasyprocta azarae. These animals are of zootechnical interest and, in addition, they can potentially be used as experimentation models because of their physical characteristics and possibility of manipulation. Therefore, the purpose of this study was to investigate the feasibility of the echocardiographic exam in nonsedated agoutis and to determine the normal reference ranges for the standard transthoracic echocardiographic parameters in healthy, adult, free-ranging agoutis found in an urban wood and intended for scientific investigations. Most of the echocardiographic parameters evaluated were similar to what has already been described for other rodent species such as rabbits or the Dasyprocta primnolopha agoutis. Based on the information compiled in this study, echocardiographic examination is feasible in awake adult, free-ranging agoutis. The results obtained from the morphologic and hemodynamic evaluation of the heart can help in future studies, either involving the clinical aspects or considering the potential use of these animals as an experimental model.
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Abstract
Cardiac disease is increasingly diagnosed in pet rabbits, presumably because of their lengthening life span and the increased sophistication of their veterinary care. However, relatively little is known about the origins of and therapy for cardiac disease in pet rabbits. Dyspnea, murmurs, and arrhythmias are common clinical signs in rabbits with cardiac disease. However, rabbits with congestive heart failure may hide signs of illness until the disease has become severe. Unique physiologic characteristics (e.g., obligate nasal breathing and limited collateral circulation to the myocardium) predispose rabbits to collapse from stress and oxygen deprivation; therefore, oxygen supplementation and stabilization are priorities for the rabbit presenting in cardiorespiratory distress. The diagnostic workup for cardiac disease in rabbits is very similar to that for traditional pets and involves radiography, electrocardiography, and echocardiography. Cardiomyopathy and valvular degeneration are relatively common forms of cardiac disease in rabbits, while congenital anomalies are rare. Use and dosing of therapeutic agents is extrapolated from dogs and cats. Spontaneous arteriosclerosis is prevalent in rabbits, with an historical incidence of up to 40% in large breeds.
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Chapel JM, Castillo C, Hernández J, Cipone M, Benedito JL. Electrocardiographic reference values for healthy Netherland Dwarf rabbits and the influence of body position, age and gender. WORLD RABBIT SCIENCE 2017. [DOI: 10.4995/wrs.2017.7424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
<p>The aim of this study was to provide reference values for a single, popular breed of pet rabbit. Moreover, additional objectives were to determine whether sex, body position or age alter Netherland Dwarf rabbit electrocardiographic variables and whether the use of electrocardiographic filters affects those variables. Forty Netherland Dwarf rabbits were examined clinically and standard six-lead electrocardiograms (ECGs) were recorded in sternal and then dorsal recumbency. At first power-line and anti-drift filters were used and then they were disabled. The following variables were measured in lead II: heart rate; P wave duration and amplitude; P-R interval; QRS duration; R wave amplitude (with and without filters); Q-T interval; T wave duration and amplitude; S-T segment; J-T duration; and mean electrical axis (MEA) (with and without filters). MEA was determined by 3 different methods. After statistical processing of the data, our results showed that there were no significant differences between both recumbencies, with the exception of the J-T duration, which was higher in dorsal recumbency. The R wave amplitude using electrocardiographic filters showed significant differences between males (0.083 mV) and females (0.115 mV; P<0.05); and between younger rabbits (0.108 mV) and older rabbits (0.097 mV; P<0.05). These differences were not shown between R waves with filters disabled. Moreover, the strongest correlation was between 2 MEA methods without filters. MEA was more leftward in the pet rabbit than in other species (dog or cats). In conclusion, electrocardiography recording without electrocardiographic filters should be assessed when it is possible, and the specific ECGs characteristics for Netherland Dwarf rabbit should be taken into account.</p>
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Doss GA, Mans C, Hoey S, Di Girolamo N, Stepien RL, Waller KR. Vertebral heart size in chinchillas (Chinchilla lanigera) using radiography and CT. J Small Anim Pract 2017; 58:714-719. [DOI: 10.1111/jsap.12715] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 05/24/2017] [Accepted: 06/16/2017] [Indexed: 11/28/2022]
Affiliation(s)
- G. A. Doss
- Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison; Madison Wisconsin 53706 USA
| | - C. Mans
- Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison; Madison Wisconsin 53706 USA
| | - S. Hoey
- School of Veterinary Medicine; University College Dublin; Belfield Dublin 4 Ireland
| | | | - R. L. Stepien
- Department of Medical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison; Madison Wisconsin 53706 USA
| | - K. R. Waller
- Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison; Madison Wisconsin 53706 USA
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15
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Abstract
Rabbits have the ability to hide their signs and often present in a state of decompensatory shock. Handling can increase susceptibility to stress-induced cardiomyopathy and specific hemodynamic changes. Careful monitoring with a specific reference range is important to detect early decompensation, change the therapeutic plan in a timely manner, and assess prognostic indicators. Fluid requirements are higher in rabbits than in other small domestic mammals and can be corrected both enterally and parenterally. Critical care in rabbits can be extrapolated to many hindgut fermenters, but a specific reference range and dosage regimen need to be determined.
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Affiliation(s)
- Minh Huynh
- Exotic Department, Centre Hospitalier Vétérinaire Frégis, 43 Avenue Aristide Briand, Arcueil 94110, France.
| | - Anaïs Boyeaux
- Department of Emergency and Critical Care, Centre Hospitalier Vétérinaire Frégis, 43 Avenue Aristide Briand, Arcueil 94110, France
| | - Charly Pignon
- Exotics Medicine Service, Alfort National Veterinary School, 7 avenue du Général de Gaulle, Maisons-Alfort 94700, France
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16
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CARDIAC ASSESSMENT OF ZOO-KEPT, BLACK-TAILED PRAIRIE DOGS (CYNOMYS LUDOVICIANUS) ANESTHETIZED WITH ISOFLURANE. J Zoo Wildl Med 2016; 47:955-962. [DOI: 10.1638/2014-0241.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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