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Prevention of early aortocoronary bypass occlusion by low-dose aspirin and dipyridamole. Grupo Español para el Seguimiento del Injerto Coronario (GESIC)

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TLDR
Low-dose aspirin plus dipyridamole safely improves early saphenous vein aortocoronary vein graft patency; this effect is an added benefit to a preoperative regimen of dipyrIDamole.
Abstract
To analyze the efficacy of low-dose aspirin in preventing early aortocoronary vein graft occlusion, 1,112 consecutive patients were enrolled in a multicenter, randomized, double-blind, placebo-controlled trial comparing 50 mg t.i.d. aspirin, 50 mg aspirin plus 75 mg t.i.d. dipyridamole, and placebo. All patients received 100 mg q.i.d. dipyridamole for 48 hours before surgery, and assigned treatment was started 7 hours after surgery. Vein graft angiography was performed in 927 patients (83%) within 28 days of surgery (mean, 10 days). Aspirin plus dipyridamole significantly (p = 0.017) reduced the occlusion rate of distal anastomoses from 18% (placebo) to 12.9%. Occlusion rate in the aspirin group was 14%, which approached statistical significance (p = 0.058). Furthermore, only aspirin plus dipyridamole reduced (p = 0.01) the number of patients with occluded grafts (placebo, 33%; aspirin, 27.1%; aspirin plus dipyridamole, 24.3%). Mediastinal drainage was slightly higher (p = 0.04) in the aspirin plus dipyridamole group (713 +/- 456 ml) than in the other two groups (placebo, 670 +/- 437 ml; aspirin, 629 +/- 337 ml), but hospital mortality (average, 4.6%) and early reoperation (average, 3.9%) rates were similar among the three groups. Thus, low-dose aspirin plus dipyridamole safely improves early saphenous vein aortocoronary graft patency; this effect is an added benefit to a preoperative regimen of dipyridamole.

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Collaborative overview of randomized trials of antiplatelet therapy .1. prevention of death, myocardial-infarction, and stroke by prolonged antiplatelet therapy in various categories of patients

R Altman, +418 more
- 08 Jan 1994 - 
TL;DR: There was no appreciable evidence that either a higher aspirin dose or any other antiplatelet regimen was more effective than medium dose aspirin in preventing vascular events, so in each of the four main high risk categories overall mortality was significantly reduced.
Journal ArticleDOI

ACC/AHA Guidelines for the Management of Patients With Acute Myocardial Infarction

TL;DR: The American College of Cardiology and the American Heart Association request that the following format be used when citing this document: Ryan TJ, Antman EM, Brooks NH, Califf RM, Hillis LD, Hiratzka LF, Rapaport E, Riegel B, Russell RO, Smith EE III, Weaver WD.
Journal ArticleDOI

Aspirin as an antiplatelet drug.

TL;DR: A rational basis for antithrombotic prophylaxis and treatment with aspirin is described and basic information on the molecular mechanism of action of aspirin in inhibiting platelet function will be integrated with the appropriate clinical pharmacologic data and the results of randomized clinical trials.
References
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Journal ArticleDOI

Selective Cumulative Inhibition of Platelet Thromboxane Production by Low-dose Aspirin in Healthy Subjects

TL;DR: In healthy men and women, aspirin causes a dose-dependent inhibition of platelet TXA(2) production, with no obvious sex-related difference, and the inhibitory effect of daily low-dose aspirin is cumulative on platelettxB but not on renal PG-synthesis; during chronic low- dose aspirin therapy, renal PGI(2)-producing cells are readily activable by furosemide at a time of virtually complete suppression of Platelet cyclooxygenase

Improvement inearlysaphenous veingraft patency after coronaryartery bypass surgerywith antiplatelet therapy: results ofaVeterans Administration Cooperative Study*

TL;DR: Early vein graft patency was improved after CABG with all aspirin-containing drug regimens and was greater in all the treatment groups that received aspirin compared with the two nonaspirin groups.
Journal ArticleDOI

IMPROVED AORTOCORONARY BYPASS PATENCY BY LOW-DOSE ASPIRIN (100 mg DAILY): Effects on Platelet Aggregation and Thromboxane Formation

TL;DR: The reduced toxicity with full efficacy favours a low and infrequent dosage of aspirin, which effectively blocked platelet throm boxane formation and thromboxane-supported aggregation on collagen and was safe in the postoperative phase.
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