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(Hypertension. 1999;34:808-812.)
© 1999 American Heart Association, Inc.

Scientific Contributions

Contribution of Stroke Volume to the Change in Pulse Pressure Pattern With Age

José Alfie; Gabriel D. Waisman; Carlos R. Galarza; Mario I. Cámera

From the Hypertension Unit, Hospital Italiano de Buenos Aires, Argentina.

Correspondence to José Alfie, MD, Unidad de Hipertensión Arterial, Servicio de Clínica Médica, Hospital Italiano, Gascón 450 (1181), Buenos Aires, Argentina. E-mail alfie{at}connmed.com.ar

Abstract—This study investigated the effect of age on pulse pressure and its underlying mechanisms in unmedicated hypertensive men with the same level of mean arterial pressure. We included 77 men 17 to 76 years old with daytime mean arterial pressure between 95 and 114 mm Hg. In the supine position, pulse pressure showed a significant widening in young (<30 years) and older (60 years) patients. Pulse pressure decreased in parallel with stroke index from age >30 to 40 to 49 years. Upright posture, however, eliminated this difference through a larger orthostatic fall in stroke index and pulse pressure in the youngest patients. After age 50 years, pulse pressure exhibited a progressive widening despite the further age-related decrease in stroke index. Supine, upright, and 24-hour pulse pressure fitted a curvilinear correlation with age (r=0.55, 0.56, and 0.68, respectively, P<0.001), with a transition at age 50 years. Before age 50 years, 24-hour pulse pressure correlated positively with stroke volume (r=0.5, P<0.001) and negatively with arterial compliance (SV/PP ratio, r=-0.37, P<0.01). In contrast, in men 50 years old, 24-hour pulse pressure correlated negatively with the SV/PP ratio (r=-0.5; P<0.01), without significant influence of stroke volume. Thus, in hypertensive men, the age-related change in stroke volume significantly accounted for the change in clinic and ambulatory pulse pressure during young adulthood, but its contribution decreased after the fifth decade.

Key Words: : age • pulse pressure • stroke volume • hypertension, arterial • blood pressure monitoring