Relationship of Maximum Rate of Pressure Rise Between Aorta and Left Ventricle in Pediatric Patients Implication for Ventricular-Vascular Interaction With the Potential for Noninvasive Determination of Left Ventricular Contractility

摘要

Background: The maximum rate of the ventricular pressure rise (dp/dtmax) provides a reliable measure of ventricular contractility. However, its estimation requires invasive measurement of left ventricular (LV) pressure, limiting its bedside clinical applicability. In the present study, 2 hypotheses were tested: (1) that the ratio of dp/dtmax between the aorta (Ao) and LV is consistent among patients despite marked differences in underlying cardiac disease, contractile state and heart rate when vascular mechanical and loading properties are taken into account, and (2) that using such a relationship, LV dp/dtmax can be estimated from Ao dp/dtmax, potentially providing a method of noninvasive determination of LV contractility. Methods and Results: Data from 30 control children and 45 pediatric patients with various cardiovascular diseases revealed that the characteristic impedance (Zc) and mean arterial pressure were significant determinants of the Ao-LV dp/dtmax relationship in both control and disease groups. LV dp/dtmax estimated using the regression obtained in the control children (Ao dp/dtmax/LV dp/dtmax=0.64+1.45*10