because our primary intent was to examine the effects of the drug on the heart and arterial circulation , lactated ringer 's solution was infused continuously to keep pulmonary capillary wedge pressure ( pcwp ) at control values in an attempt to keep constant the ventricular `` '' preload '' '' ( although pcwp is only an approximation of the true preload ) .
C0018787
heart
C0018827
ventricular