Strain e Strain Rate longitudinal por meio do speckle tracking bidimensional em gatos domésticos sadios e não sedados

Abstract

Echocardiography has become one of the most important diagnostic methods in veterinary cardiology. Thus, new tools incorporated into echocardiography such as tissue Doppler and, more recently two-dimensional speckle tracking has been assisting in the definitive diagnosis, as well as in determining the prognosis of cardiac diseases. The speckle tracking is a well-established and validated tool in human medicine and is used in several heart diseases. In veterinary medicine its use has been demonstrated in dogs and horses. However, its use is recently applied to veterinary, given that, there is little species being studied with speckle tracking. Regarding felines, there is little or even absence of information about the use of this tool in domestic cats. Thus, the present work aimed to demonstrate the use of the two-dimensional speckle tracking echocardiography, in order to establish preliminary reference range and the technique in healthy non-sedated cats. For this purpose, were used 30 clinically healthy non-sedated cats, which were obtained the systolic blood pressure, electrocardiogram (ECG), and Doppler echocardiography. Three to 5 consecutive heart cycles using a continuous monitoring ECG were stored in digital format on a workstation for off-line analysis. Cine loops were acquired from left apical four chamber view and 6 measurements using speckle tracking software were obtained in two different Cine loops (3 measurements for each Cine loop) at end-systole for all studied variables and then average was calculated. Myocardial longitudinal function was evaluated and the variables longitudinal Strain (%) Strain Rate (1/s), velocity (cm/s) and displacement (mm) were obtained, showing the values -15.65 ± 5.46, -1.80 ± 0.59, 1.41 ± 0.87, 1.27 ± 0.80, respectively. Thus, the present study helps in the better understanding of myocardial function in cats