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Table 1 Definition of study groups

From: Survival benefit of coronary-artery bypass grafting accounted for deaths in those who remained untreated

Group Target Time for Surgery Anginal Symptoms, Coronary Anatomy, and Left Ventricular Function
Semi-urgent Within 6 weeks Patients with either persistent unstable angina or stable angina and extensive CAD* (left-main stenosis more than 50 percent, triple-vessel disease, or double-vessel disease with significant proximal left anterior descending stenosis and impaired left ventricular function)
Non-urgent Within 12 weeks Stable symptomatic patients with limited CAD (double-vessel disease with no lesion in the proximal left anterior descending artery and normal left ventricular function or single-vessel disease with significant stenosis of the proximal left anterior descending artery)
  1. *CAD = coronary artery disease.
  2. Target Time = Recommended time