Analysis of Pressure Head‐Flow Loops of Pulsatile Rotodynamic Blood Pumps

In this study, the impact of these parameters upon the heart‐RBP interaction was examined in terms of the pressure head‐flow (HQ) diagram. The measurements were conducted using a rotodynamic Deltastream DP2 pump in a validated hybrid mock circulation with baroreflex function. The pump was operated with a sinusoidal speed profile, synchronized to the native cardiac cycle. The simulated ventriculo‐aortic cannulation showed that the level of (un)loading and the shape of the HQ loops strongly depend on the phase shift. The HQ loops displayed characteristic shapes depending on the phase shift. Increased contribution of native contraction (increased ventricular stroke work [WS]) resulted in a broadening of the loops. It was found that the previously described linear relationship between WS and the area of the HQ loop for constant pump speeds becomes a family of linear relationships, whose slope depends on the phase shift.

Source: Artificial Organs - July 1, 2013 Category: Transplant Surgery Authors: Silje E. Jahren, Gregor Ochsner, Fangjun Shu, Raffael Amacher, James F. Antaki, Stijn Vandenberghe Tags: Main Text Article Source Type: research