Figure 7.

Ratio of blood flow during systole to blood flow during diastole in the right coronary artery (RCA) as a function of right ventricular (RV) systolic pressure in patients with pulmonary hypertension. When RV systolic pressure is near normal levels, the amount of RCA blood flow is similar during systole and diastole. As RV systolic pressure increases, RCA blood flow during systole falls. Blood flow in the RCA during systole is inversely proportional to RV systolic pressure, such that RCA blood flow during systole approaches zero as RV systolic pressure approaches systemic levels. Reproduced by permission from Reference 67.