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Bahadormanesh N, Tomka B, Abdelkhalek M, Khodaei S, Maftoon N, Keshavarz-Motamed Z. A Doppler-exclusive non-invasive computational diagnostic framework for personalized transcatheter aortic valve replacement. Sci Rep 2023; 13:8033. [PMID: 37198194 PMCID: PMC10192526 DOI: 10.1038/s41598-023-33511-6] [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: 10/21/2022] [Accepted: 04/13/2023] [Indexed: 05/19/2023] Open
Abstract
Given the associated risks with transcatheter aortic valve replacement (TAVR), it is crucial to determine how the implant will affect the valve dynamics and cardiac function, and if TAVR will improve or worsen the outcome of the patient. Effective treatment strategies, indeed, rely heavily on the complete understanding of the valve dynamics. We developed an innovative Doppler-exclusive non-invasive computational framework that can function as a diagnostic tool to assess valve dynamics in patients with aortic stenosis in both pre- and post-TAVR status. Clinical Doppler pressure was reduced by TAVR (52.2 ± 20.4 vs. 17.3 ± 13.8 [mmHg], p < 0.001), but it was not always accompanied by improvements in valve dynamics and left ventricle (LV) hemodynamics metrics. TAVR had no effect on LV workload in 4 patients, and LV workload post-TAVR significantly rose in 4 other patients. Despite the group level improvements in maximum LV pressure (166.4 ± 32.2 vs 131.4 ± 16.9 [mmHg], p < 0.05), only 5 of the 12 patients (41%) had a decrease in LV pressure. Moreover, TAVR did not always improve valve dynamics. TAVR did not necessarily result in a decrease (in 9 out of 12 patients investigated in this study) in major principal stress on the aortic valve leaflets which is one of the main contributors in valve degeneration and, consequently, failure of heart valves. Diastolic stresses increased significantly post-TAVR (34%, 109% and 81%, p < 0.001) for each left, right and non-coronary leaflets respectively. Moreover, we quantified the stiffness and material properties of aortic valve leaflets which correspond with the reduced calcified region average stiffness among leaflets (66%, 74% and 62%; p < 0.001; N = 12). Valve dynamics post-intervention should be quantified and monitored to ensure the improvement of patient conditions and prevent any further complications. Improper evaluation of biomechanical valve features pre-intervention as well as post-intervention may result in harmful effects post-TAVR in patients including paravalvular leaks, valve degeneration, failure of TAVR and heart failure.
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Affiliation(s)
- Nikrouz Bahadormanesh
- Department of Mechanical Engineering, McMaster University, JHE-310, Hamilton, ON, L8S 4L7, Canada
| | - Benjamin Tomka
- Department of Mechanical Engineering, McMaster University, JHE-310, Hamilton, ON, L8S 4L7, Canada
| | | | - Seyedvahid Khodaei
- Department of Mechanical Engineering, McMaster University, JHE-310, Hamilton, ON, L8S 4L7, Canada
| | - Nima Maftoon
- Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada
- Centre for Bioengineering and Biotechnology, University of Waterloo, Waterloo, ON, Canada
| | - Zahra Keshavarz-Motamed
- Department of Mechanical Engineering, McMaster University, JHE-310, Hamilton, ON, L8S 4L7, Canada.
- School of Biomedical Engineering, McMaster University, Hamilton, ON, Canada.
- School of Computational Science and Engineering, McMaster University, Hamilton, ON, Canada.
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Trachsel DS, Calloe K, J Rgensen E, Lunddahl CS, Pedersen PJ, Kanters JRK, Klaerke DA, Buhl R. Evaluation of electrocardiographic repolarization parameters after administration of trimethoprim-sulfadiazine, detomidine, or their combination in horses. Am J Vet Res 2021; 82:207-217. [PMID: 33629897 DOI: 10.2460/ajvr.82.3.207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine whether administration of trimethoprim-sulfadiazine (TMS), detomidine (DET), or TMS plus DET would be associated with changes in ECG repolarization parameters in horses. ANIMALS 9 healthy adult horses. PROCEDURES Each horse received 4 treatments in a blinded, randomized, crossover study design as follows: TMS, 16 to 24 mg/kg, IV; DET, 0.015 to 0.02 mg/kg, IV; TMS plus DET; and saline (0.9% NaCl) solution. Surface ECG traces were obtained over 24 hours, and repolarization parameters were measured at predefined time points after each treatment and compared with a 2-way ANOVA for repeated measures. RESULTS Heart rate-corrected QT intervals (QTc) were significantly increased after administration of DET (mean ± SD difference in QTc, 36.57 ± 23.07 milliseconds; increase of 7%) and TMS plus DET (44.96 ± 29.16 milliseconds; increase of 9%), compared with baseline (before treatment) values and values after administration of saline solution. Saline solution and TMS alone did not affect QTc. CONCLUSIONS AND CLINICAL RELEVANCE Administration of DET or TMS plus DET was associated with a significant and possibly clinically relevant prolongation of QTc, with prolongation of 7% to 9%, a range that is considered as a risk factor for the development of cardiac arrhythmias in people. Results were unexpected because DET is considered to be a safe sedative for horses.
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Zuber N, Zuber M, Schwarzwald CC. Assessment of systolic and diastolic function in clinically healthy horses using ambulatory acoustic cardiography. Equine Vet J 2018; 51:391-400. [DOI: 10.1111/evj.13014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Accepted: 08/21/2018] [Indexed: 12/13/2022]
Affiliation(s)
- N. Zuber
- Clinic for Equine Internal Medicine, Vetsuisse Faculty University of Zurich Zurich Switzerland
| | - M. Zuber
- Division of Cardiology University of Zurich Zurich Switzerland
| | - C. C. Schwarzwald
- Clinic for Equine Internal Medicine, Vetsuisse Faculty University of Zurich Zurich Switzerland
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Afonso T, Giguère S, Brown SA, Barton MH, Rapoport G, Barba M, Dembek KA, Toribio RE, Coleman AE. Preliminary investigation of orally administered benazepril in horses with left-sided valvular regurgitation. Equine Vet J 2017; 50:446-451. [PMID: 29044678 DOI: 10.1111/evj.12773] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 10/11/2017] [Indexed: 11/26/2022]
Abstract
BACKGROUND Despite the paucity of data available, orally administered angiotensin-converting enzyme (ACE) inhibitors are empirically used in horses with valvular regurgitation. OBJECTIVE Evaluate the echocardiographic and hormonal changes in response to oral benazepril in horses with left-sided valvular regurgitation. STUDY DESIGN Prospective, randomised double-blind, placebo-controlled trial. METHODS Horses with mitral valve (MR) and/or aortic valve regurgitation (AR) received oral benazepril (n = 6) at a dosage of 1 mg/kg q 12 h or a placebo (n = 5) for 28 days. Echocardiography was performed before drug administration and after 28 days of treatment. Plasma renin activity, serum ACE activity, angiotensin II concentration, aldosterone concentration and biochemical variables were measured before drug administration and after 7 and 28 days of treatment. RESULTS Relative to baseline, horses treated with benazepril had statistically significant reduction in left ventricular internal diameter in systole (mean difference between groups = -0.97 cm; 95% CI = -1.5 to -0.43 cm), aortic sinus diameter (-0.31 cm; -0.54 to -0.07 cm), and percentage of the aortic annulus diameter occupied by the base of the AR jet (-17.05%; -31.17 to -2.93%) compared with horses receiving a placebo. In addition, horses treated with benazepril had a significantly greater increase in cardiac output (11.95 L/min; 1.17-22.73 L/min) and fractional shortening (7.59%; 3.3-11.88%) compared with horses receiving a placebo. Despite profound serum ACE inhibition, renin activity and concentrations of angiotensin II and aldosterone were not significantly different between treatment groups or among time points. MAIN LIMITATIONS Very small sample size and short treatment period. CONCLUSIONS Treatment with oral benazepril resulted in statistically significant echocardiographic changes that might indicate reduced cardiac afterload in horses with left-sided valvular regurgitation. Additional studies with a larger sample size will be necessary to determine if administration of benazepril is beneficial in horses with valvular regurgitation. The Summary is available in Spanish - see Supporting Information.
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Affiliation(s)
- T Afonso
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - S Giguère
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - S A Brown
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - M H Barton
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - G Rapoport
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - M Barba
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
| | - K A Dembek
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, USA
| | - R E Toribio
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, USA
| | - A E Coleman
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
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Abbott JA, Gentile-Solomon JM. Measurement Variation and Repeatability of Echocardiographic Variables Used to Estimate Pulmonary Artery Pressure in Dogs. J Vet Intern Med 2017; 31:1622-1628. [PMID: 29031025 PMCID: PMC5697183 DOI: 10.1111/jvim.14846] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 06/09/2017] [Accepted: 08/28/2017] [Indexed: 11/30/2022] Open
Abstract
Background Pulmonary hypertension (PH) is an important clinical entity in dogs. Pulmonary hypertension is generally identified based on echocardiographic findings, but measurement variation of the variables most often used in this context has not been reported. Objective To define measurement variation of echocardiographic variables that are used to estimate pulmonary artery pressure. Animals Four dogs with subclinical tricuspid valve regurgitation were selected from a hospital population. Methods Prospective descriptive study ‐ dogs were subject to repeated echocardiographic examination by 2 operators. Each dog was echocardiographically examined 12 times, once by each operator during mornings and afternoons of 3 nonconsecutive days. Measurement variation was defined by coefficients of variation and by mean square errors (MSE) from ANOVA models. Repeatability coefficients (RC) were calculated from MSE. Results Of 50 within‐day, between‐day, and interoperator coefficients of variation (CVs), 37 were less than 10% and 46 were less than 15%. The range of peak velocity of tricuspid valve regurgitation (VTR) VTR was 1.87–3.34 m/s. Analysis of variance revealed a significant effect (P < 0.05) of operator for 7 of 10 measurements. Within‐operator/between‐day/within‐subject and between‐operator/between‐day/within‐subject RCs of VTR were, respectively, 0.3 and 0.6 m/s. Conclusions and Clinical Importance With regard to repeatability, VTR is superior to other methods used for echocardiographic estimation of systolic pulmonary artery pressure. When TR is absent, the acceleration time of pulmonary ejection and the acceleration‐to‐ejection time ratio are alternative measures. A change in VTR exceeding 0.3 m/s might be outside the range of expected within‐operator variation.
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Affiliation(s)
- J A Abbott
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA
| | - J M Gentile-Solomon
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA
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Decloedt A, Schwarzwald CC, De Clercq D, Van Der Vekens N, Pardon B, Reef VB, van Loon G. Risk factors for recurrence of atrial fibrillation in horses after cardioversion to sinus rhythm. J Vet Intern Med 2015; 29:946-53. [PMID: 25917409 PMCID: PMC4895430 DOI: 10.1111/jvim.12606] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 02/13/2015] [Accepted: 03/31/2015] [Indexed: 11/29/2022] Open
Abstract
Background Although atrial fibrillation (AF) can be successfully treated in horses, recurrence occurs frequently. In humans, atrial function after cardioversion can predict recurrence. Objectives To examine the prognostic value of atrial mechanical function at 24 hours after cardioversion and other potential predictor variables for AF recurrence in horses. Animals 117 horses treated for AF at 4 referral centers. Methods Retrospective study. Inclusion criteria were successful cardioversion, echocardiography at 24 hours after cardioversion and ≥4 months follow‐up. To determine factors associated with AF recurrence, a multivariable survival model was built. Results 133 AF episodes in 117 horses were included. AF recurred in 36/100 horses with a first AF episode and in 57/133 AF episodes overall. Factors associated with recurrence in horses with a first episode were previous unsuccessful treatment attempt (hazard ratio HR 2.36, 95% confidence interval CI 1.11–4.99, P = .025) and mild or moderate mitral regurgitation (HR 2.70, 95% CI 1.23–5.91, P = .013). When the last AF episode of all horses was included, previous AF (HR 2.53, 1.33–4.82, P = .005) and active left atrial fractional area change ≤9.6% (HR 3.43, 1.22–9.67, P = .020) were significant predictors. Conclusions and Clinical Importance The only echocardiographic variable of left atrial function with significant prognostic value for recurrence was low active left atrial fractional area change. Further research is necessary to evaluate whether echocardiography at a later timepoint could provide more prognostic information.
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Affiliation(s)
- A Decloedt
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, 9820, Belgium
| | - C C Schwarzwald
- Clinic for Equine Internal Medicine, Vetsuisse Faculty, University of Zurich, Zurich, 8057, Switzerland.,Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, OH, 43210
| | - D De Clercq
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, 9820, Belgium
| | - N Van Der Vekens
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, 9820, Belgium
| | - B Pardon
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, 9820, Belgium
| | - V B Reef
- Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA, 19348
| | - G van Loon
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, 9820, Belgium
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Hassan EA, Torad FA. Two-Dimensional and M-Mode Echocardiographic Measurements in the Healthy Donkey (Equus asinus). J Equine Vet Sci 2015. [DOI: 10.1016/j.jevs.2015.01.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Atrial Natriuretic Peptide as an Indicator of the Severity of Valvular Regurgitation and Heart Failure in Horses. J Equine Vet Sci 2014. [DOI: 10.1016/j.jevs.2014.08.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Michlik KM, Biazik AK, Henklewski RZ, Szmigielska MA, Nicpoń JM, Pasławska U. Quadricuspid aortic valve and a ventricular septal defect in a horse. BMC Vet Res 2014; 10:142. [PMID: 24981768 PMCID: PMC4134333 DOI: 10.1186/1746-6148-10-142] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 06/17/2014] [Indexed: 12/13/2022] Open
Abstract
Background Quadricuspid aortic valve (QAV) and ventricular septal defect (VSD) are congenital heart defects and have been described in both human and veterinary medical literature. Case presentation A 5-year-old half-bred bay stallion was referred for surgical castration. Cardiac murmurs were heard on the presurgical clinical examination and the cardiac examination revealed subcutaneous oedema, tachycardia with a precodrial thrill and a grade 5/6 pansystolic murmur, which was heard on auscultation of the right and left side of the chest. Examination of the B-mode echocardiograms revealed the presence of a QAV (one small cusp, two equal-sized cusps, and one large cusp) and VSD in the membranous portion of the intraventricular septum. These two congenital cardiac defects were accompanied by mild aortic valve regurgitation and severe tricuspid regurgitation. Despite the presence of these cardiac defects, the horse underwent surgical castration under general anesthesia. Surgery, anaesthesia and recovery from anaesthesia were uneventful. The gelding was euthanasied after 17 months because of a progressive loss of body weight, weakness and recumbency. Conclusion A QAV in combination with VSD in a horse is an interesting finding, because to the best of our knowledge, this has not been previously described in equine literature.
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Affiliation(s)
- Katarzyna M Michlik
- Department of Internal Medicine and Clinic of Disease of Horses, Dogs and Cats, Veterinary Faculty of Wrocław University of Environmental and Life Sciences, pl, Grunwaldzki 47, 50-366 Wrocław, Poland.
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Vitale V, Sgorbini M, Briganti A, Corazza M, Breghi G, Staffieri F. Evaluation of Echocardiographic Parameters During Increasing Infusion Rates of Dobutamine in Isoflurane-Anesthetized Horses. J Equine Vet Sci 2013. [DOI: 10.1016/j.jevs.2013.04.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Leroux A, Detilleux J, Sandersen C, Borde L, Houben R, Al Haidar A, Art T, Amory H. Prevalence and Risk Factors for Cardiac Diseases in a Hospital-Based Population of 3,434 Horses (1994-2011). J Vet Intern Med 2013; 27:1563-70. [DOI: 10.1111/jvim.12197] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 07/18/2013] [Accepted: 08/13/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
- A.A. Leroux
- Equine Teaching Hospital; Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - J. Detilleux
- Quantitative Genetics Section; Department of Animal Production; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - C.F. Sandersen
- Equine Teaching Hospital; Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - L. Borde
- Equine Teaching Hospital; Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - R.M.A.C. Houben
- Equine Teaching Hospital; Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - A. Al Haidar
- Equine Teaching Hospital; Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - T. Art
- Equine Sports Medicine Centre; Department of Functional Sciences (Art); Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
| | - H. Amory
- Equine Teaching Hospital; Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Liege; Sart-Tilman Liege Belgium
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de Solis CN, Slack J, Boston RC, Reef VB. Hypertensive cardiomyopathy in horses: 5 cases (1995–2011). J Am Vet Med Assoc 2013; 243:126-30. [DOI: 10.2460/javma.243.1.126] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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McConachie E, Barton M, Rapoport G, Giguère S. Doppler and Volumetric Echocardiographic Methods for Cardiac Output Measurement in Standing Adult Horses. J Vet Intern Med 2013; 27:324-30. [DOI: 10.1111/jvim.12034] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 08/23/2012] [Accepted: 11/27/2012] [Indexed: 11/28/2022] Open
Affiliation(s)
- E. McConachie
- Department of Large Animal Medicine; College of Veterinary Medicine; University of Georgia; Athens GA
| | - M.H. Barton
- Department of Large Animal Medicine; College of Veterinary Medicine; University of Georgia; Athens GA
| | - G. Rapoport
- Department of Large Animal Medicine; College of Veterinary Medicine; University of Georgia; Athens GA
- Departments of Small Animal Medicine and Surgery; College of Veterinary Medicine; University of Georgia; Athens GA
| | - S. Giguère
- Department of Large Animal Medicine; College of Veterinary Medicine; University of Georgia; Athens GA
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Leroux AA, Farnir F, Moonen ML, Sandersen CF, Deleuze S, Amory H. Repeatability, variability and reference values of pulsed wave Doppler echocardiographic measurements in healthy Saanen goats. BMC Vet Res 2012; 8:190. [PMID: 23067875 PMCID: PMC3488548 DOI: 10.1186/1746-6148-8-190] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 10/12/2012] [Indexed: 11/11/2022] Open
Abstract
Background Pulsed wave (PW) Doppler echocardiography has become a routine non invasive cardiac diagnostic tool in most species. However, evaluation of intracardiac blood flow requires reference values, which are poorly documented in goats. The aim of this study was to test the repeatability, the variability, and to establish the reference values of PW measurements in healthy adult Saanen goats. Using a standardised PW Doppler echocardiographic protocol, 10 healthy adult unsedated female Saanen goats were investigated three times at one day intervals by the same observer. Mitral, tricuspid, aortic and pulmonary flows were measured from a right parasternal view, and mitral and aortic flows were also measured from a left parasternal view. The difference between left and right side measurements and the intra-observer inter-day repeatability were tested and then the reference values of PW Doppler echocardiographic parameters in healthy adult female Saanen goats were established. Results As documented in other species, all caprine PW Doppler parameters demonstrated a poor inter-day repeatability and a moderate variability. Tricuspid and pulmonary flows were best evaluated on the right side whereas mitral and aortic flows were best obtained on the left side, and reference values are reported for healthy adult Saanen goats. Conclusions PW Doppler echocardiography allows the measurement of intracardiac blood flow indices in goats. The reference values establishment will help interpreting these indices of cardiac function in clinical cardiac cases and developing animal models for human cardiology research.
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Affiliation(s)
- Aurélia A Leroux
- Equine Clinic, Department of Companion Animals and Equids, University of Liege, Liege, Sart Tilman, Belgium.
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Hallowell GD, Potter TJ, Bowen IM. Reliability of quantitative echocardiography in adult sheep and goats. BMC Vet Res 2012; 8:181. [PMID: 23017011 PMCID: PMC3574009 DOI: 10.1186/1746-6148-8-181] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 09/25/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Echocardiography is a non-invasive method for assessment of the ovine and caprine heart. Complete reference ranges for cardiac dimensions and time indices for both species are not currently available and reliability of these measurements has not been evaluated. The objectives for this study are to report reliability, normal cardiac dimensions and time indices in a large group of adult sheep and goats.Fifty-one adult sheep and forty adult goats were recruited. Full echocardiographic examinations were performed in the standing unsedated animal. All animals underwent echocardiography four times in a 72-hour period. Echocardiography was performed three times by one author and once by another. Images were stored and measured offline. Technique and measurement repeatability and reproducibility and any differences due to animal or day were evaluated. Reference ranges (mean ± 2 standard deviations) were calculated for both species. RESULTS Majority of the images obtained were of good to excellent quality. Image acquisition was straightforward with 5.4% of animals demonstrating a small scanning window. Reliability was excellent for majority of dimensions and time indices. There was less variation in repeatability when compared with reproducibility and differences were greater for technique than for measurements. Dimensions that were less reliable included those for right ventricular diameter and left ventricular free wall. There were many differences in cardiac dimensions between sheep and goats. CONCLUSIONS This study has demonstrated that specific reference ranges are required for these two species. Repeatability and reproducibility were excellent for the majority of cardiac dimensions and time indices suggesting that this technique is reliable and valuable for examination of clinical cases over time and for longitudinal research studies.
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Affiliation(s)
- Gayle D Hallowell
- School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, LE12 5RD, UK
| | - Timothy J Potter
- Westpoint Veterinary Group, Dawes Farm, Bognor Road, Warnham, West Sussex, RH12 3SH, UK
| | - I Mark Bowen
- School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, LE12 5RD, UK
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Leroux AA, Moonen ML, Farnir F, Sandersen CF, Deleuze S, Salciccia A, Amory H. Two-dimensional and M-mode echocardiographic reference values in healthy adult Saanen goats. Vet Rec 2012; 170:154. [DOI: 10.1136/vr.100192] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- A. A. Leroux
- Equine Clinic; Department of Companion Animals and Equids; Faculty of Veterinary Medicine; University of Liege; Boulevard de Colonster 20, Bât B41 4000 Liege - Sart Tilman Belgium
| | - M. L. Moonen
- Department of Cardiology; University Hospital of Liege; Medicine Faculty; University of Liege; avenue de l'Hôpital 13, Bât B35 4000 Liege - Sart Tilman Belgium
| | - F. Farnir
- Biostatistics, Bioinformatics and Animal Selection; Department of Animal Production; Faculty of Veterinary Medicine; University of Liege; Boulevard de Colonster 20, Bât B43 4000 Liege - Sart Tilman Belgium
| | - C. F. Sandersen
- Equine Clinic; Department of Companion Animals and Equids; Faculty of Veterinary Medicine; University of Liege; Boulevard de Colonster 20, Bât B41 4000 Liege - Sart Tilman Belgium
| | - S. Deleuze
- Equine Clinic; Department of Companion Animals and Equids; Faculty of Veterinary Medicine; University of Liege; Boulevard de Colonster 20, Bât B41 4000 Liege - Sart Tilman Belgium
| | - A. Salciccia
- Equine Clinic; Department of Companion Animals and Equids; Faculty of Veterinary Medicine; University of Liege; Boulevard de Colonster 20, Bât B41 4000 Liege - Sart Tilman Belgium
| | - H. Amory
- Equine Clinic; Department of Companion Animals and Equids; Faculty of Veterinary Medicine; University of Liege; Boulevard de Colonster 20, Bât B41 4000 Liege - Sart Tilman Belgium
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SLACK J, DURANDO MM, BELCHER CN, COLLINS N, PALMER L, OUSEY J, BIRKS EK, MARR CM. Intraoperator, intraobserver and interoperator variability of echocardiographic measurements in healthy foals. Equine Vet J 2012:69-75. [DOI: 10.1111/j.2042-3306.2011.00503.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Draper ACE, Bowen IM, Hallowell GD. Reference ranges and reliability of transabdominal ultrasonographic renal dimensions in thoroughbred horses. Vet Radiol Ultrasound 2011; 53:336-41. [PMID: 22168823 DOI: 10.1111/j.1740-8261.2011.01902.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 10/24/2011] [Indexed: 11/29/2022] Open
Abstract
The aims of this study were to establish a normal reference range (mean ± 2 SD) and assess reliability of renal dimensions obtained using transabdominal ultrasonography in Thoroughbred horses (n = 7). A minimum of three ultrasonographic cineloops were obtained from each intercostal space and the left paralumbar fossa by two observers daily for three consecutive days. Renal length, width, and thickness and cortex, medulla, and pelvic dimensions were obtained. Measurements were undertaken by both observers, who were unaware of prior measurements, to assess reproducibility and measured on three separate occasions to evaluate short-term measurement repeatability. Measurements from images obtained by both operators were compared to evaluate image repeatability. The left kidney was consistently identified in the left 15th-17th intercostal space and the paralumbar fossa with maximal length in the 16th intercostal space (12.7 ± 2.0 cm) and maximal width in the paralumbar fossa (7.9 ± 1.1 cm). The right kidney was consistently identified in the right 15th-17th intercostal space with maximal length and maximal width in the 15th intercostal space (16.0 ± 0.7 cm and 7.9 ± 1.0 cm). Reproducibility, image repeatability, measurement repeatability were good to excellent, although were less good for the smaller structures. There were no differences in renal dimensions between horses. Overall renal ultrasonography was reliable and a normal reference range for Thoroughbred horses was established. Renal dimensions vary between rib spaces. As repeatability and reproducibility were excellent for renal length and width, it may be prudent to use those measurements in rib spaces where parameters were maximal.
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Buhl R, Meldgaard C, Barbesgaard L. Cardiac arrhythmias in clinically healthy showjumping horses. Equine Vet J 2011:196-201. [PMID: 21059006 DOI: 10.1111/j.2042-3306.2010.00185.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
REASONS FOR PERFORMING STUDY Electrocardiographic reference values of clinically normal horses during exercise are a prerequisite when evaluating horses with poor performance or horses presented with cardiac abnormalities (e.g. valvular regurgitation). No published studies have reported cardiac rhythms of clinically normal showjumping horses. OBJECTIVES To demonstrate the feasibility of obtaining exercise electrocardiogram (ECG) in normal horses during showjumping and also to document the prevalence and frequency of arrhythmias in association with exercise. METHODS Thirty-four healthy showjumping horses aged 4-13 years (mean 7.5 years) underwent clinical examination and resting echocardiography. Modified chest lead ECG examinations were performed during rest, during a standardised showjumping course, as well as for the following 45 min recovery. All ECG recordings were analysed for presence and frequency of arrhythmias. RESULTS Six horses (17%) were excluded due to ECG recordings of poor diagnostic quality. Echocardiography demonstrated that 11 (39%) horses had one or more mild or moderate valvular regurgitations, but no associations were found between valvular regurgitation and arrhythmias. Supraventricular premature complexes (SVPCs) were found in 9 (32%) horses at rest, 25 (89%) during exercise and 15 (54%) during recovery. Only few arrhythmias occurred in each horse (<9 SVPCs/horse); however, one horse had 13 single SVPCs during exercise and another developed 41 SVPCs during recovery. SVPCs occurred typically at low HR (40-98 beats/min). Ventricular premature complexes (VPCs) was demonstrated in 5 (18%) horses during exercise and 2 (7%) during recovery, with <2 VPCs/horse. CONCLUSIONS It is possible to obtain good quality ECG during showjumping. Reference values for normal performing showjumping horses are presented for the first time and showed a high prevalence of SVPCs both during and after exercise, but few VPCs. POTENTIAL RELEVANCE Normal reference values enable future studies of cardiac function in showjumping horses presented with poor performance and provide valuable information for veterinary practitioners in the field.
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Affiliation(s)
- R Buhl
- Department of Large Animal Sciences, Faculty of Life Sciences, University of Copenhagen, Denmark.
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Barbesgaard L, Buhl R, Meldgaard C. Prevalence of exercise-associated arrhythmias in normal performing dressage horses. Equine Vet J 2011:202-7. [PMID: 21059007 DOI: 10.1111/j.2042-3306.2010.00223.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
REASONS FOR PERFORMING STUDY Exercise-associated arrhythmias are important differentials when evaluating poor performance sport horses. However, most studies of arrhythmias have been conducted in racehorses and therefore there is a paucity of knowledge concerning the prevalence and significance of exercise-associated arrhythmias in riding horses. OBJECTIVES The objective of this study was to examine the prevalence of arrhythmias, particularly supraventricular premature complex (SVPCs) and ventricular premature complex (VPCs), associated with exercise in normal performing dressage horses. METHODS In total, 21 normal performing dressage horses, aged 5-16 years (mean 9 years), were examined clinically and echocardiographically to detect the prevalence of valvular regurgitation. Electrocardiographic (ECG) examinations were performed during rest and during a standardised dressage exercise programme, as well as during recovery period 1 h after exercise. All ECG recordings were analysed for presence and frequency of arrhythmias and arrhythmias were correlated with HR. Mean HR for walk, trot, canter and for specific dressage movements, as well as maximum HR was calculated. Fisher's exact test was used to test for associations between arrhythmias, valvular regurgitation, age and gender. RESULTS SVPCs occurred rarely during rest, but occurred during exercise in 6 (28.6%), and in 13 (61.9%) horses during recovery period. Most horses had ≤ 3 SVPCs. Ventricular premature complex were seen in one horse, which developed twice during exercise. Mild valvular regurgitation was seen in 11 (52%) of the horses. No significant associations between arrhythmia and age, gender or valvular regurgitation were observed. CONCLUSIONS Reference values for normal performing dressage horses are presented for the first time, demonstrating that arrhythmias occur infrequently during exercise and recovery. Maximum HR in dressage horses is low compared to both showjumping and racehorses. Studies of dressage horses with moderate to severe valvular regurgitation at rest or poor performance are needed to further elucidate the significance of cardiac arrhythmias.
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Affiliation(s)
- L Barbesgaard
- Faculty of Life Sciences, Department of Large Animal Sciences, University of Copenhagen, Agrovej 5, Taastrup, Denmark.
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22
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Collins NM, Palmer L, Marr CM. Two-dimensional and M-mode echocardiographic findings in healthy Thoroughbred foals. Aust Vet J 2010; 88:428-33. [DOI: 10.1111/j.1751-0813.2010.00641.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Underwood C, Norton J, Nolen-Walston R, Dallap-Schaer B, Boston R, Slack J. Echocardiographic Changes in Heart Size in Hypohydrated Horses. J Vet Intern Med 2010; 25:563-9. [DOI: 10.1111/j.1939-1676.2010.0612.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Abstract
REASONS FOR PERFORMING STUDY Although valvular regurgitation is diagnosed frequently by colour Doppler echocardiography in racehorses at rest, there is currently no information about the effect of exercise on valvular regurgitation. OBJECTIVES To investigate the effect of light exercise on valvular regurgitation in a population of trotters. METHODS Standardbred trotters (n = 73) were examined by resting auscultation and echocardiography, of which 50 fullfilled the criteria of the study. Of these, 4 had reduced performance according to the trainers and were not included in the statistical analyses. Horses that showed valvular regurgitations diagnosed by colour Doppler echocardiography at rest, were light exercised and the regurgitant valves were then re-examined by colour Doppler echocardiography. RESULTS Of the 46 horses, 41 (89%) had one or more valvular regurgitations at rest with tricuspid regurgitation present in 83% of horses, mitral regurgitation 46%, pulmonary regurgitation 37% and aortic regurgitation 57%. After exercise, one or more valvular regurgitation persisted for 23 of the 41 horses (56%). The regurgitation decreased significantly for mitral, pulmonary and aortic valves; the mitral regurgitation persisted for 21% of the horses, pulmonary regurgitation persisted for 6% and aortic regurgitation persisted after exercise for 23 % with regurgitation diagnosed at rest. Half of those with tricuspid regurgitation at rest still had tricuspid regurgitation after exercise. CONCLUSIONS The results of this study showed that the majority of small valvular regurgitations disappear after light exercise. However, the severity of tricuspid regurgitation increased in 4 horses. Furthermore, these horses were not performing satisfactorily according to the trainers. POTENTIAL RELEVANCE Studies in man have shown that severity after exercise suggests pathological regurgitation. The present study indicates that echocardiographic examination of valvular regurgitation after exercise might be a relevant examination in horses. However, more studies are needed to evaluate the effect of strenuous exercise on valvular regurgitation in horses.
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Affiliation(s)
- R Buhl
- Department of Large Animal Sciences, The Royal Veterinary andAgricultural University, 48 Dyrlaegevej, DK- 1870 Frederiksberg C, Denmark
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Helwegen MMGHJ, Young LE, Rogers K, Wood JLN. Measurements of right ventricular internal dimensions and their relationships to severity of tricuspid valve regurgitation in National Hunt Thoroughbreds. Equine Vet J 2010:171-7. [PMID: 17402414 DOI: 10.1111/j.2042-3306.2006.tb05535.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
REASONS FOR PERFORMING STUDY The effect of tricuspid valve regurgitation (TR) in right ventricular (RV) chamber size has not been reported. METHODS An echocardiographic and auscultation study was conducted on 394 race-fit National Hunt Thoroughbreds (TBs) in 4 training yards. Auscultation was performed on each horse and audible murmurs of TR graded using a 1-6 scale. Echocardiography was also performed and standard, 2-dimensional (2D), short (SA) and long axis (LA) images of the RV obtained from a right parasternal location. An m-mode image was recorded from an SA view of the RV just below the level of the tricuspid valve. Colour flow Doppler (CFD) echocardiography was used to interrogate the tricuspid valve and right atrium. If retrograde flow was visible, representative recordings were also acquired. Severity of TR by CFD was graded using a subjective 1-9 scale. Measurements of RV chamber size in systole and diastole were made from archived 2D, LA, SA and m-mode images by a single observer unaware of the auscultation and CFD findings. To determine day-to-day repeatability of RV measurements from each imaging plane and of TR by CFD, 5 horses were examined on 5 consecutive days using an identical echocardiographic protocol. Images from 30 horses in the original dataset were also measured on a second occasion to determine the intra-observer repeatability. RESULTS There were significant positive correlations between the severity of TR by CFD and RV internal diameter from each image plane. In contrast, there were no significant associations between grade of TR by auscultation and any RV dimension. Data also showed that only RV measurements derived from M-mode images have acceptable intraobserver repeatability and similarly the M-mode measurements had the best overall day-to-day repeatability. CONCLUSIONS AND CLINICAL RELEVANCE Data showed that TR assessed by CFD was positively associated with the diastolic and systolic dimensions of the RV, but failed to demonstrate a positive association between the presence of a murmur of TR and RV chamber size. M-mode and 2D echocardiography provided moderately reliable and repeatable methods for obtaining measurements of RV internal dimensions. M-mode images provide the most reliable and repeatable measurements, particularly for less experienced operators.
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Al Haidar A, Farnir F, Deleuze S, Sandersen C, Amory H. Comparison of the Repeatability of Echocardiographic Measurements from Different Modes and Views in Horses of Various Breeds and Sizes. J Equine Vet Sci 2010. [DOI: 10.1016/j.jevs.2010.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Rovira S, Muñoz A, Rodilla V. Allometric scaling of echocardiographic measurements in healthy Spanish foals with different body weight. Res Vet Sci 2009; 86:325-31. [DOI: 10.1016/j.rvsc.2008.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2007] [Revised: 06/02/2008] [Accepted: 08/03/2008] [Indexed: 11/24/2022]
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Menzies-Gow NJ. Effects of sedation with acepromazine on echocardiographic measurements in eight healthy thoroughbred horses. Vet Rec 2008; 163:21-5. [PMID: 18603631 DOI: 10.1136/vr.163.1.21] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Eight normal thoroughbred horses were examined by echocardiography before and 10 minutes after they had been sedated by the intravenous administration of 0.03 mg/kg acepromazine. There were significant (P<0.025) increases in the diameters of the pulmonary artery and the aorta, measured at end-systole, and in the thickness of the interventricular septum, measured at end-systole and end-diastole. In addition, there was a significant (P<0.001) decrease in the diameter of the left atrium measured at end-diastole. The remaining cardiac dimensions, all the indices of cardiac function, and the occurrence and severity of valvular regurgitation were not affected by sedation.
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Affiliation(s)
- N J Menzies-Gow
- Department of Veterinary Clinical Sciences, Royal Veterinary College, Hawkshead Lane, Hatfield AL9 7TA, UK
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Zucca E, Ferrucci F, Croci C, Di Fabio V, Zaninelli M, Ferro E. Echocardiographic measurements of cardiac dimensions in normal Standardbred racehorses. J Vet Cardiol 2008; 10:45-51. [DOI: 10.1016/j.jvc.2008.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Frank N, Buchanan BR, Elliott SB. Effects of long-term oral administration of levothyroxine sodium on serum thyroid hormone concentrations, clinicopathologic variables, and echocardiographic measurements in healthy adult horses. Am J Vet Res 2008; 69:68-75. [DOI: 10.2460/ajvr.69.1.68] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Buhl R, Ersbøll AK, Larsen NH, Eriksen L, Koch J. The effects of detomidine, romifidine or acepromazine on echocardiographic measurements and cardiac function in normal horses. Vet Anaesth Analg 2007; 34:1-8. [PMID: 17238956 DOI: 10.1111/j.1467-2995.2005.00269.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To evaluate by echo- and electrocardiography the cardiac effects of sedation with detomidine hydrochloride, romifidine hydrochloride or acepromazine maleate in horses. STUDY DESIGN An experimental study using a cross-over design without randomization. ANIMALS Eight clinically normal Standardbred trotters. MATERIALS AND METHODS Echocardiographic examinations (two-dimensional, guided M-mode and colour Doppler) were recorded on five different days. Heart rate (HR) and standard limb lead electrocardiograms were also obtained. Subsequently, horses were sedated with detomidine (0.01 mg kg(-1)), romifidine (0.04 mg kg(-1)) or acepromazine (0.1 mg kg(-1)) administered intravenously and all examinations repeated. RESULTS Heart rate before treatment with the three drugs did not differ significantly (p = 0.98). Both detomidine and romifidine induced a significant decrease (p < 0.001) in HR during the first 25 minutes after sedation; while acepromazine had a varying effect on HR. For detomidine, there was a significant increase in LVIDd (left ventricular internal diameter in diastole; p = 0.034) and LVIDs (left ventricular internal diameter in systole; p < 0.001). In addition, a significant decrease was found in IVSs (the interventricular septum in systole; p < 0.001), LVFWs (the left ventricular free wall in systole; p = 0.002) and FS% (fractional shortening; p < 0.001). The frequency of pulmonary regurgitation was increased significantly (p < 0.001). Romifidine induced a significant increase in LVIDs (p < 0.001) and a significant decrease in IVSs (p < 0.001) and FS% (p = 0.002). Acepromazine had no significant effect upon any of the measured values. CONCLUSIONS and clinical relevance The results indicate that sedation of horses with detomidine and to a lesser extent romifidine at the doses given in this study has a significant effect on heart function, echocardiographic measurements of heart dimensions and the occurrence of valvular regurgitation. Although the clinical significance of these results may be minimal, the potential effects of sedative drugs should be taken into account when echocardiographic variables are interpreted in clinical cases.
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Affiliation(s)
- Rikke Buhl
- Department of Large Animal Sciences, The Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
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Buhl R, Ersbøll AK, Eriksen L, Koch J. Use of color Doppler echocardiography to assess the development of valvular regurgitation in Standardbred trotters. J Am Vet Med Assoc 2006; 227:1630-5. [PMID: 16313042 DOI: 10.2460/javma.2005.227.1630] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the incidence and development of valvular regurgitation and its effect on racing performance in Standardbred trotters from 2 to 3.5 years of age. DESIGN Longitudinal observational study. ANIMALS 103 horses. PROCEDURE Horses were examined via echocardiographic imaging 4 times at 6-month intervals. Two-dimensional and M-mode echocardiographic examinations were performed in each horse, and color Doppler imaging was used to detect and evaluate regurgitant blood flow at each valve. RESULTS For all cardiac valves, the frequency of valvular regurgitation increased significantly during the 18-month study period. Regurgitation was mild in all valves in which it was detected, and no progression in severity was observed at any valve. Tricuspid regurgitation was more prevalent in horses that raced regularly and was diagnosed more frequently in males and horses with larger left ventricular mass and left ventricular internal diameter during diastole. No relationship between racing performance and valvular regurgitation was observed. CONCLUSIONS AND CLINICAL RELEVANCE The incidence of valvular regurgitation increased during the study period, and it was common at 3.5 years of age. It was not possible to determine whether the increase was a result of maturity or training. The study revealed that there is a high prevalence of mild valvular regurgitation at this age, but apparently, the regurgitation had no effect on racing performance in this age group. Whether regurgitation will progress or influence future performance is not known.
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Affiliation(s)
- Rikke Buhl
- Department of Large Animal Sciences, The Royal Veterinary and Agricultural University, Frederiksberg, Denmark
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Chetboul V, Tidholm A, Nicolle A, Sampedrano CC, Gouni V, Pouchelon JL, Lefebvre HP, Concordet D. Effects of animal position and number of repeated measurements on selected two-dimensional and M-mode echocardiographic variables in healthy dogs. J Am Vet Med Assoc 2005; 227:743-7. [PMID: 16178395 DOI: 10.2460/javma.2005.227.743] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the effects of positioning and number of repeated measurements on intra- and interobserver variability of echocardiographic measurements in dogs. DESIGN Prospective study. ANIMALS 4 healthy dogs. PROCEDURE Each observer performed 24 examinations, separately assessing each dog 6 nonconsecutive times (3 times with the dog in lateral recumbency and 3 with the dog in a standing position). Variables evaluated included M-mode measurements of left ventricular end-diastolic and left ventricular end-systolic diameters, left ventricular free-wall thickness in diastole and systole, interventricular septal thickness in diastole and systole, left ventricular shortening fraction, and 2-dimensional measurements of the left atrial diameter-to-aortic diameter ratio. RESULTS All coefficients of variation (range, 3.4% to 26.6%) were similar between operators and positions and were < 15% for 27 of 32 values. For both operators, repeatability of the measurements was better for left ventricular end-systolic diameter, left ventricular free-wall thickness in diastole, left ventricular free-wall thickness in systole, and the left atrial diameter-to-aortic diameter in the standing position, and similar for both positions for shortening fraction and left ventricular end-diastolic diameter. No effect of cardiac cycle was observed. CONCLUSIONS AND CLINICAL RELEVANCE Within-day variability of conventional echocardiography performed with the dog in the standing position was at least as good as that obtained with the dog in lateral recumbency for most measured variables. Single measurements of each variable may be sufficient for trained observers examining dogs that do not have an arrhythmia. The standing position should be used, particularly for stressed or dyspneic dogs.
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Affiliation(s)
- Valerie Chetboul
- Unité de Cardiologie, and INSERM U660, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort cedex, France
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Buhl R, Ersbøll AK, Eriksen L, Koch J. Changes over time in echocardiographic measurements in young Standardbred racehorses undergoing training and racing and association with racing performance. J Am Vet Med Assoc 2005; 226:1881-7. [PMID: 15934256 DOI: 10.2460/javma.2005.226.1881] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate changes over time in echocardiographic measurements in young Standardbred racehorses undergoing training and racing and determine whether there was any relationship between cardiac dimensions and racing performance. DESIGN Longitudinal observational study. ANIMALS 103 horses. PROCEDURE 2-dimensional and M-mode echocardiography was performed 4 times at 6-month intervals. RESULTS Significant cardiac enlargement took place during the study period as indicated by increases in left ventricular internal diameter in diastole (LVIDd), estimated left ventricular muscle mass (LV mass), and mean wall thickness attributable to eccentric left ventricular hypertrophy. Estimated body weight was positively correlated with left ventricular size, and males had significantly larger LVIDd and LV mass than did females. Horses that were racing regularly had larger LVIDd and LV mass than did unraced horses. A significant relationship between left ventricular size and racing performance was observed. The relationship was strongest at the time of the fourth examination. CONCLUSIONS AND CLINICAL RELEVANCE Results suggest that age must be taken into account when interpreting results of echocardiography in young Standardbred racehorses because significant cardiac enlargement takes place with age and training. A larger heart was found in horses that were racing, and size of the heart was correlated with athletic performance of the horse.
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Affiliation(s)
- Rikke Buhl
- Department of Large Animal Sciences, The Royal Veterinary and Agricultural University, 88-Dyrlaegevej, DK-1870 Frederiksberg C, Denmark
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