Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná (UFPR), Rua dos Funcionários 1540, Curitiba, 80035-050, Brazil.
Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná (UFPR), Rua dos Funcionários 1540, Curitiba, 80035-050, Brazil.
J Vet Cardiol. 2020 Dec;32:40-48. doi: 10.1016/j.jvc.2020.09.010. Epub 2020 Sep 29.
INTRODUCTION/OBJECTIVES: There are few parameters for assessment of right ventricular (RV) systolic function on echocardiographic examination. Morphofunctional studies are limited by the irregular shape of the RV. Recently, tissue motion annular displacement (TMAD), a technique that evaluates valve annulus displacement toward the cardiac apex, has shown a good correlation with left ventricular global longitudinal strain (GLS) in healthy dogs. Therefore, the aim of this study was to evaluate the longitudinal systolic function of the RV of healthy dogs using TMAD.
A hundred healthy client-owned dogs.
Cross-sectional study. Physical examination, electrocardiogram, blood pressure measurement, and echocardiography were recorded. The systolic function of the RV was evaluated by GLS free wall and TMAD. Data were compared with those derived from conventional echocardiography.
TMAD values varied according to body weight. There was a correlation of TMAD in millimeters with all indices of RV systolic function, including GLS free wall (R:-0.239; p:0.017). TMAD had a correlation with age and heart rate; whereas there was no relationship with sex and blood pressure. The coefficient of variation for the intraobserver evaluation was lower for the TMAD in millimeters (9.9%) compared with the GLS free wall (17.9%). In addition, the mean time to perform TMAD (8.1 s) was lower than that of the GLS free wall (37.7 s).
TMAD is a fast, reproducible, and promising method for assessing RV systolic function in healthy dogs. However, further studies are needed to understand the applicability of this technique in patients with heart disease.
介绍/目的：在超声心动图检查中，评估右心室（RV）收缩功能的参数很少。形态功能研究受到 RV 不规则形状的限制。最近，组织运动环形位移（TMAD）评估瓣环向心尖方向的位移的技术，已显示出与健康犬的左心室整体纵向应变（GLS）具有良好的相关性。因此，本研究旨在使用 TMAD 评估健康犬 RV 的纵向收缩功能。
100 只健康的客户拥有的狗。
横断面研究。记录体格检查、心电图、血压测量和超声心动图。RV 收缩功能通过 GLS 游离壁和 TMAD 进行评估。将数据与常规超声心动图得出的数据进行比较。
TMAD 值随体重而变化。TMAD 与 RV 收缩功能的所有指标均呈相关关系，包括 GLS 游离壁（R：-0.239；p：0.017）。TMAD 与年龄和心率相关，而与性别和血压无关。毫米 TMAD 的观察者内评估变异系数（9.9%）低于 GLS 游离壁（17.9%）。此外，执行 TMAD 的平均时间（8.1s）低于 GLS 游离壁（37.7s）。
TMAD 是一种快速、可重复、有前途的评估健康犬 RV 收缩功能的方法。然而，需要进一步的研究来了解该技术在心脏病患者中的适用性。
