V.A. cooperative study on antiplatelet agents in diabetic patients after amputation for gangrene: I. Design, methods, and baseline characteristics

John A. Colwell, Stephen F. Bingham, Carlos Abraira, James W. Anderson, Hau C. Kwaan

Research output: Contribution to journalArticle

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Abstract

This report describes the experimental design, methods, and baseline characteristics of patients enrolled in a Veterans Administration Cooperative Study on the effect of aspirin (325 mg t.i.d.) and dipyridamole (75 mg t.i.d.) (110 patients), or placebo (121 patients) on major vascular outcome variables in noninsulin-dependent diabetic patients with either a recent amputation for gangrene (n = 207) or active gangrene (n = 24). It also describes the baseline characteristics of the patients. A total of 231 patients of 563 screened (41%) were enrolled at 11 participating V.A. Medical Centers during a 39 month period. The median age at entry was 60 years, the median duration of diabetes was 10 years, and weight was 110% of desirable. All patients were men. Sixty-eight percent were treated with insulin and 32% with diet alone. Only 42% were smokers at entry, 40% had retinopathy, 61% sensory neuropathy, 42% hypertension, and 29% had a history of myocardial infarction, angina, and/or congestive heart failure. Thirteen percent had a history of cerebrovascular disease. Despite randomization, the treatment group had an increased frequency of a history of cerebrovascular disease (p = 0.01), diagnosed as stroke (p = 0.03), a finding suggesting that the treatment group was at a slightly increased risk for vascular disease upon enrollment in the study. Other baseline variables did not differ significantly between the two groups. This study should provide definitive data on the efficacy of these doses of anti-platelet agents in preventing further vascular disease in diabetic men with gangrene or recent amputation for gangrene, using death due to vascular disease and subsequent amputation of the opposite extremity for gangrene as major outcome variables. It should also give useful information on the effect of antiplatelet therapy on other vascular outcome variables such as same side amputations, myocardial infarction, stroke, transient ischemic attack, retinopathy, and renal failure. Finally, the study should provide useful data on the natural history and significance of risk factors in this patient population.

Original languageEnglish
Pages (from-to)165-183
Number of pages19
JournalControlled Clinical Trials
Volume5
Issue number2
DOIs
StatePublished - Jan 1 1984

Fingerprint

Gangrene
Platelet Aggregation Inhibitors
Amputation
Cerebrovascular Disorders
Vascular Diseases
Blood Vessels
Stroke
Myocardial Infarction
Diabetic Angiopathies
United States Department of Veterans Affairs
Dipyridamole
Transient Ischemic Attack
Random Allocation
Natural History
Aspirin
Renal Insufficiency
Research Design
Therapeutics
Blood Platelets
Extremities

Keywords

  • amputation
  • antiplatelet agents
  • Diabetes mellitus
  • gangrene
  • lower extremity vascular disease
  • V.A. Cooperative Study

ASJC Scopus subject areas

  • Pharmacology

Cite this

V.A. cooperative study on antiplatelet agents in diabetic patients after amputation for gangrene : I. Design, methods, and baseline characteristics. / Colwell, John A.; Bingham, Stephen F.; Abraira, Carlos; Anderson, James W.; Kwaan, Hau C.

In: Controlled Clinical Trials, Vol. 5, No. 2, 01.01.1984, p. 165-183.

Research output: Contribution to journalArticle

Colwell, John A. ; Bingham, Stephen F. ; Abraira, Carlos ; Anderson, James W. ; Kwaan, Hau C. / V.A. cooperative study on antiplatelet agents in diabetic patients after amputation for gangrene : I. Design, methods, and baseline characteristics. In: Controlled Clinical Trials. 1984 ; Vol. 5, No. 2. pp. 165-183.
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