Published online before print May 7, 2007, doi: 10.1161/HYPERTENSIONAHA.107.089078
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(Hypertension. 2007;50:197.)
© 2007 American Heart Association, Inc.
Sixth International Workshop on Structure and Function of the Vascular System |
Central Pressure More Strongly Relates to Vascular Disease and Outcome Than Does Brachial Pressure
The Strong Heart Study
From the Division of Cardiology (M.J.R., R.B.D., J.R.K.), Weill Medical College of Cornell University, New York; the Center for American Indian Health Research (E.T.L., T.A.), University of Oklahoma Health Sciences Center, Oklahoma City; the University of Arizona (J.M.G.), Tucson; and Medstar Research Institute (J.G.U., B.V.H.), Washington, DC.
Correspondence to Mary J. Roman, MD, Division of Cardiology, 525 East 68th Street, New York, NY 10021. E-mail mroman{at}med.cornell.edu
Brachial blood pressure is predictive of cardiovascular outcome; however central pressure may better represent the load imposed on the coronary and cerebral arteries and thereby bear a stronger relationship to vascular damage and prognosis. Relations of brachial and central pressures to carotid artery hypertrophy (intimal-medial thickness and vascular mass), extent of atherosclerosis (plaque score), and incident cardiovascular events were examined in the Strong Heart Study. Central pressures were calculated using radial applanation tonometry. Among 3520 participants, central and brachial pulse pressures were more strongly related to vascular hypertrophy and extent of atherosclerosis than were systolic pressures. Central pulse pressure was more strongly related to all 3 arterial measures than was brachial pulse pressure (r=0.364 versus 0.309 for plaque score; P<0.001 for comparison of Spearman correlation coefficient; r=0.293 versus 0.249 for intimal-medial thickness; P<0.002; r=0.320 versus 0.289 for vascular mass; P<0.05). Among the 2403 participants free of clinical cardiovascular disease at baseline, 319 suffered fatal or nonfatal cardiovascular events during mean follow-up of 4.8±1.3 years. After adjustment for age, gender, current smoking, body mass index, cholesterol:HDL ratio, creatinine, fibrinogen, diabetes, and heart rate, central pulse pressure predicted cardiovascular events more strongly than brachial pulse pressure (hazards ratio=1.15 per 10 mm Hg, 
2=13.4, P<0.001 versus hazards ratio=1.10, 2=6.9, P=0.008). In conclusion, noninvasively-determined central pulse pressure is more strongly related to vascular hypertrophy, extent of atherosclerosis, and cardiovascular events than is brachial blood pressure. These findings support prospective examination of use of central blood pressure as a treatment target in future trials.
Key Words: blood pressure • arterial stiffness • atherosclerosis
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