Feasibility and reference intervals assessed by conventional and speckle‐tracking echocardiography in normal hamsters

• Published in: Physiological reports Vol. 9; no. 5; pp. e14776 - n/a
• Main Authors: Barros Filho, Antonio C. L., Moreira, Henrique T., Dias, Beatriz P., Ribeiro, Fernando F. F., Tanaka, Denise M., Schmidt, André, Maciel, Benedito C., Simões, Marcus V., Marin‐Neto, José A., Romano, Minna M. D.
• Format: Journal Article
• Language: English
• Published: United States John Wiley & Sons, Inc 01.03.2021; John Wiley and Sons Inc; Wiley
• Subjects: Anesthesia; Animal models; Animals; Cardiac arrhythmia; Coronary artery disease; Cricetinae; Echocardiography; Echocardiography - methods; Echocardiography, Three-Dimensional - methods; Ejection fraction; Feasibility Studies; hamster; Heart diseases; Heart rate; Heart Ventricles - physiopathology; Image Interpretation, Computer-Assisted - methods; left ventricular function; Methods; Normal distribution; Original; Physiology; Reference Values; Software; speckle tracking; Stroke Volume - physiology; Structure-function relationships; Ventricle; Ventricular Dysfunction, Left - physiopathology; Ventricular Function, Left - physiology; Work stations; speckle tracking; reference values; left ventricular function; hamster; echocardiography
• ISSN: 2051-817X
• DOI: 10.14814/phy2.14776

Objectives This study aimed to determine feasibility, reference intervals, and reproducibility of left ventricular ejection fraction (LVEF) and speckle‐tracking echocardiography (STE) in adult Syrian hamsters. Background Syrian hamster is an experimental model for several heart diseases. Echocardiography allows the evaluation of structure and function with bidimensional conventional techniques and STE. However, there is no data regarding reference values for bidimensional LVEF and myocardial strain in hamsters. Methods A total of 135 female Syrian hamsters were anesthetized and studied with a small animal dedicated echocardiography system. Echocardiography measurements were obtained from M‐mode and B‐mode images. Feasibility and 95% reference intervals were obtained for LVEF using three different approaches: LVEF_Teichholz (from M‐mode linear measurements), LVEF_BMode (from area‐length method), and LVEF_ STE (from strain), and for global longitudinal (GLS), circumferential (GCS), and radial (GRS) endocardial strain. Reproducibility was assessed as intra‐class correlation coefficients. Results Feasibility of LVEF and endocardial strain was high (95% in FEVE_Teichholz, 93% in the LVEF_BMode, 84% in the LVEF_STE, 84% from PSLAX, and 80% from PSSAX). Values of LVEF_Teichholz were significantly higher than values of LVEF_BMode, and LVEF_STE‐derived methods (59.0 ± 5.8, 53.8 ± 4.7, 46.3 ± 5.7, p < 0.0001). The 95% reference intervals for GLS, GCS, and GRS were respectively −13.6(−7.5;‐20.4)%, −20.5 ± 3.1%, and + 34,7 ± 7.0%. Intra‐class correlation coefficients were 0.49 – 0.91 for LVEF measurements, 0.73 – 0.92 for STE, with better results for LVEF_Teichholz and GLS. Conclusions Evaluation of LVEF by several methods and STE parameters is feasible in hamsters. Reference intervals for LVEF and STE obtained for this experimental animal model can be applied at future research. Speckle tracking echocardiography (STE) is highly feasible in Syrian hamsters; Reference intervals of parameters of systolic function in hamsters are described; Reproducibility of STE in hamsters could guide future studies in this animal model.