Coronary flow reserve is impaired in young men with familial hypercholesterolemia

Journal of the American College of Cardiology
O P PitkänenJ Knuuti

Abstract

We sought to investigate whether functional abnormalities in coronary vasomotion exist in young adults by studying 15 men (age 31 +/- 8 years [mean +/- SD]) with familial hypercholesterolemia (FH) and a matched group of 20 healthy control subjects. Precursors of morphologic coronary artery disease are known to be present in adolescents and young adults with a high risk factor profile. Myocardial blood flow was measured at the basal state and during dipyridamole-induced hyperemia using positron emission tomography and oxygen-15-labeled water. Serum total and low density lipoprotein cholesterol concentrations were higher in the patients than in the control subjects (mean +/- SD): 7.7 +/- 1.9 versus 5.3 +/- 1.5 mmol/liter (298 +/- 73 vs. 205 +/- 58 mg/dl) and 6.1 +/- 1.8 versus 3.5 +/- 1.4 mmol/liter (236 +/- 70 vs. 135 +/- 54 mg/dl), respectively (both p < 0.001). The baseline myocardial blood flow was similar in the patients and control subjects: 0.92 +/- 0.24 versus 0.83 +/- 0.13 ml/g per min, respectively (p = 0.21). A significant increase in flow was observed in both groups after dipyridamole infusion, but the flow at maximal vasodilation was 29% lower in the patients: 3.19 +/- 1.59 versus 4.49 +/- 1.27 ml/g per min (p = 0.01...Continue Reading

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