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Platelet glycoprotein IIb/IIIa receptor blockade and coronary resistance in unstable angina.

Abstract：

OBJECTIVES:We designed a study to explore the effect of glycoprotein (GP) IIb/IIIa blockade on the atherosclerotic plaque and distal coronary vasculature. BACKGROUND:Platelet GP IIb/IIIa blockers have been proven to be beneficial in acute ischemic syndromes. This effect has also been attributed to the prevention of microvascular obstruction, although the underlying mechanisms have not been fully defined. METHODS:Eighteen patients with unstable refractory angina pectoris underwent cardiac catheterization and angioplasty. Trans-stenotic and microvascular resistances to flow were measured at baseline, during hyperventilation, and after intracoronary adenosine. Measurements were repeated early after abciximab administration and after successful percutaneous transluminal coronary angioplasty. RESULTS:Hyperventilation induced an ischemic attack in 12 of 18 patients and increased epicardial (12.8 +/- 16.9 vs. 6.1 +/- 6.1 mm Hg/ml per min, p < 0.05) and microvascular (9.9 +/- 7.5 vs. 6.8 +/- 5.8 mm Hg/ml per min, p < 0.05) coronary resistance. Abciximab had no significant effect on epicardial resistance, although it significantly reduced distal coronary resistance under all study conditions, including baseline (4.8 +/- 4.8 mm Hg/ml per min, p < 0.01), hyperventilation (5.1 +/- 5.4 mm Hg/ml per min, p < 0.01), and intracoronary adenosine (2.7 +/- 3.0 vs. 4.3 +/- 4.3 mm Hg/ml per min, p < 0.05). The hyperventilation test became negative in all patients after abciximab administration. CONCLUSIONS:These observations confirm the immediate beneficial effects of platelet GP IIb/IIIa blockade with abciximab in acute ischemic syndromes and suggest that improvement of microvascular function may play a central role in the mechanism of action of this drug.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Marzilli M,Sambuceti G,Testa R,Fedele S

doi

10.1016/s0735-1097(02)02590-1

subject

Has Abstract

pub_date

2002-12-18 00:00:00

pages

2102-9

issue

12

eissn

0735-1097

issn

1558-3597

pii

S0735109702025901

journal_volume

40

pub_type

临床试验,杂志文章

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