Effects of normal blood pressure, prehypertension, and hypertension on coronary microvascular function

Circulation
Dogan ErdoganHaldun Muderrisoglu

Abstract

The assessment of coronary flow reserve (CFR) by transthoracic Doppler echocardiography has recently been introduced into clinical practice, and reduced CFR has been suggested to be a sensitive indicator of hypertensive end-organ damage; however, to date, this methodology has not been used to evaluate CFR in subjects with prehypertension. Accordingly, the present study was designed to evaluate CFR in subjects with prehypertension. We measured CFR of 40 subjects with prehypertension, 60 patients with hypertension, and 50 normotensive healthy volunteers using transthoracic Doppler echocardiography. None of the subjects had any systemic disease. Age, gender, body mass index, heart rate, lipid profiles, fasting glucose levels, and hemoglobin were similar among the 3 groups. CFR was significantly lower in the hypertension group than in the prehypertension and control groups; in addition, it was significantly lower in subjects with prehypertension than in control subjects (2.23+/-0.47, 2.54+/-0.48, and 2.91+/-0.53, respectively). Furthermore, we found that prehypertension (beta=-0.31, P<0.01) and hypertension (beta=-0.57, P<0.01) were significant predictors of lower CFR in a multivariable model that adjusted for other variables. CFR ...Continue Reading

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