Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná (UFPR), Rua dos Funcionários, 1540, Curitiba, Paraná, CEP 80035-050, Brazil.
Autonomous veterinarian, Curitiba, Paraná, Brazil.
Vet Res Commun. 2022 Sep;46(3):823-836. doi: 10.1007/s11259-022-09907-6. Epub 2022 Mar 8.
The tissue motion annular displacement (TMAD) measures the longitudinal displacement of the mitral annulus during systole, using speckle-tracking echocardiography (STE). The main objective was to determine the TMAD means in healthy cats, exploring the correlations with systolic surrogates. The influence of age, body surface area (BSA), heart rate, and systemic blood pressure on the indices was also analyzed. One hundred ninety-three healthy, client-owned cats participated in this prospective, cross-sectional observational study undergoing conventional and STE. Apical four-chamber (AP4) and two-chamber (AP2) images were recorded for offline calculations. Mean TMAD values were similar to mitral annulus plane systolic excursion (MAPSE), varying between 4 to 4.8 mm depending on the annulus and image used. No significant differences between age and BSA categories were detected, except for AP4 MP%, reduced in the heavier group. TMAD variables showed moderate correlation with longitudinal strain (LSt) and MAPSE, but not with fraction shortening (FS) and ejection fraction (EF). The median time required for the offline calculation was 12.2 s for AP4 and 11.8 s for AP2. The technique showed moderate inter and intraobserver variation, proving a reliable tool for assessing left ventricular longitudinal systolic function in cats.
组织运动环状位移（TMAD）使用斑点追踪超声心动图（STE）测量收缩期二尖瓣环的纵向位移。主要目的是确定健康猫的 TMAD 平均值，探讨与收缩期替代指标的相关性。还分析了年龄、体表面积（BSA）、心率和系统血压对这些指标的影响。193 只健康的、有主人的猫参与了这项前瞻性的、横断面的观察性研究，接受了常规超声心动图和 STE 检查。记录心尖四腔（AP4）和两腔（AP2）图像，以便离线计算。平均 TMAD 值与二尖瓣环平面收缩期位移（MAPSE）相似，根据使用的瓣环和图像，变化范围在 4 到 4.8mm 之间。除了较重组的 AP4 MP% 降低外，年龄和 BSA 类别之间没有发现显著差异。TMAD 变量与纵向应变（LSt）和 MAPSE 呈中度相关，但与缩短分数（FS）和射血分数（EF）无关。AP4 的离线计算中位数时间为 12.2 秒，AP2 的中位数时间为 11.8 秒。该技术显示出中等的观察者内和观察者间的变异性，证明了它是评估猫左心室纵向收缩功能的可靠工具。
