Left ventricular systolic response to exercise in patients with systemic hypertension without left ventricular hypertrophy

Abstract

Supine exercise radionuclide angiography was performed in 367 men to assess left ventricular (LV) systolic response to exercise; 58 had systemic hypertension without LV hypertrophy on a resting electrocardiogram and 309 were normotensive. All patients met the following criteria defining a low pretest likelihood of coronary artery disease: age <50 years; normal electrocardiographic response to exercise; absence of typical or atypical chest pain; and exercise heart rate >120 beats/min. Patients taking β-receptor blockers were excluded. There were no significant differences between hypertensive and normotensive groups in peak exercise heart rate, workload or exercise duration. However, hypertensive patients had significantly higher peak exercise systolic blood pressures and peak exercise rate-pressure products. There were no differences between patients with and without hypertension in resting ejection fraction, peak exercise ejection fraction (hypertensive patients 0.71 ± 0.01, normotensive patients 0.70 ± 0.05) or change in ejection fraction at peak exercise (hypertensive patients 0.07 ± 0.01, normotensive patients 0.07 ± 0.04). Diastolic and systolic ventricular volumes tended to be smaller in the hypertensive patients, but the difference was not statistically significant. The change in systolic volume with exercise was similar in the 2 groups (hypertensive -10 ± 3 ml/m 2, normotensive -10 ± 1 ml/m 2). In the absence of electrocardiographic evidence of LV hypertrophy, systemic hypertension does not influence LV systolic response to exercise.