to determine whether the asynchronous left ventricular contraction-relaxation sequence that exists during right ventricular pacing alters left ventricular relaxation , measurements of both the maximal rate of decline of left ventricular pressure ( peak negative dp/dt ) and the time constant of left ventricular relaxation were obtained during atrial and atrioventricular ( av ) pacing in 25 patients referred for diagnostic cardiac catheterization .
C0018792
atrial
C0018787
cardiac