Análise da concordância dos valores de pressão arterial de equinos em estação pelos métodos invasivo e doppler em cauda - Resultados preliminares

Abstract

Blood pressure is an important clinical parameter that can be measured in conscious, standing horses with the aim of assessing peripheral tissue perfusion. The gold standard method for blood pressure assessment is the direct, or invasive, method, which consists of inserting a catheter into the facial or transverse facial artery. However, this method is more feasible in anesthetized animals and requires a higher degree of knowledge and practical skill to be properly performed and to provide reliable values. Given these limitations, non-invasive methods for measuring blood pressure, such as Doppler, can be used. This technique is mainly based on the temporary occlusion of blood flow using a cuff, followed by its release and the detection of flow return through auscultation with the Doppler device. Considering its relevance, the objective is to measure the blood pressure of adult standing horses using both invasive and Doppler ultrasonic sphygmomanometry methods, through the transverse facial artery catheterization and tail cuff placement, respectively, and then collect the measured values. Measurements were performed in eight healthy animals, simultaneously between the methods, during normotension, hypotension, and hypertension, pharmacologically induced using sodium nitroprusside and acepromazine to achieve hypotension, and norepinephrine to induce hypertension. Based on the collected data, this study aims to analyze the agreement and reliability of blood pressure measurements obtained by the invasive and non-invasive methods under the proposed conditions. Preliminary results show that although the methods are correlated, Doppler tends to record higher values, especially under hypertensive conditions, and its measurements should therefore be interpreted considering hydrostatic correction and the possibility of overestimation.