Hypertension has a major impact on cardiovascular and renal mortality and morbidity, with a 90% lifetime risk of developing hypertension. 1 Optimal blood pressure control reduces the risk of stroke by 38% and of myocardial infarction by 16%. 2 Compared to peripheral arterial pressure measurements, aortic pressures were shown to better predict coronary artery disease (CAD) 3,4 and cardiovascular risk. 5 Brachial arterial pressure does not correctly reflect aortic pressure, especially its systolic component, due to pulse pressure amplification. 6,7 It is also important to mention that central (aortic) pressures are the pressures directly affecting coronary and cerebral circulations, as well as the left ventricle, much more than pressures measured in the arm, and the latter is of paramount importance in end-organ damage related to hypertension. 8 Several ascending aortic blood pressure indices were studied, among which aortic pulse pressure (APP) correlated with increased cardiovascular complications. 9 Moreover, a higher APP was associated with more extensive CAD at time of coronary angiography. 10 A recent large prospective study has shown the superiority of central (aortic) over peripheral (brachial) pressures, as well as the superiority of APP and pulsatility over mean pressure in predicting adverse cardiovascular events. 11 Higher APP is related to arterial stiffness, a feature of aging and multiple cardiovascular conditions. 7 Although arterial stiffening is thought to represent by itself a form of cardiovascular end-organ damage, 7 and although APP is only an indirect indicator of arterial stiffness, higher APP may link arteriosclerosis (arterial stiffening) to other forms of end-organ damage such as atherosclerosis. The role of cyclical stretch due to pulsatile pressure in atherosclerosis is recognized. 12
BackgroundAortic pulse pressure (APP) is related to arterial stiffness and associated with the presence and extent of coronary artery disease (cAD). Besides, the left coronary artery (LcA) has a predominantly diastolic flow while the right coronary artery (RcA) receives systolic and diastolic flow. thus, we hypothesized that increased systolicdiastolic pressure difference had a greater atherogenic effect on the RcA than on the LcA.