Hemodynamic characteristics of echocardiographic findings in hypertensive patients with negative U waves and effect of an antihypertensive drug, tripamide.

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Twenty-four hypertensive patients were divided into a group A with negative U waves (n=8, mean age, 50±11 years) and a group B without negative U waves (n=16, mean age, 49±11 years). Echocardiographic findings were compared with a group of 20 age-matched normotensive subjects without cardiovascular disease (mean age, 49±11 years). In addition, the effects of the antihypertensive agent tripamide were assessed in groups A and B. Although hemodynamic parameters such as left ventricular end-systolic and diastolic dimensions, stroke volume and cardiac output were elevated in group A, group B showed an increase in total peripheral resistance. Thus, group A was characterized by high cardiac output, while group B displayed increased peripheral resistance. Tripamide was administered to 14 patients. In group A (6 patients receiving tripamide), left ventricular end-systolic and end-diastolic dimensions were significantly reduced by tripamide along with stroke volume and cardiac output. However, in group B the only significant change in hemodynamic parameters after tripamide administration was a drop in total peripheral resistance. These findings suggest that both the hemodynamics of hypertensive patients and responses to tripamide vary with the presence of negative U waves.
International Heart Journal刊行会の論文