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BACKGROUND To determine the relation of post-percutaneous transluminal coronary angioplasty (PTCA) restenosis to serum lipid fractions and to circulating levels of endogenous tissue plasminogen activator (t-PA) and its rapid inhibitor (PAI-1), 68 patients with coronary artery disease who underwent a successful PTCA were studied. METHODS AND RESULTS During a mean follow-up of 9 months (range, 7-11 months), 28 (41%) patients developed restenosis. A low high density lipoprotein (HDL) cholesterol level was independently and strongly related to both the risk of restenosis (p less than 0.001) and to the time of restenosis (p = 0.03). The mean HDL cholesterol level was 33 +/- 12 mg% in the restenosis group compared with 45 +/- 12 mg% in the nonrestenosis group (p less than 0.001). Restenosis developed in 22 of 34 (64%) patients with an HDL cholesterol less than or equal to 40 mg% compared with six of 34 (17%) patients with an HDL cholesterol greater than 40 mg% (p less than 0.002). The only other variable that was significantly related to restenosis was a low PAI-1 level (p = 0.04). CONCLUSIONS The strong relation between a low HDL cholesterol level and the risk of restenosis suggests that lipid fractions could be important in the pathogenesis and prevention of restenosis.

Low high density lipoprotein level is associated with increased restenosis rate after coronary angioplasty.