Incidence of new diabetes following CABG surgery: Analysis of a single centre registry data

BACKGROUND: About 40-50% of patients undergoing coronary artery bypass graft (CABG) surgery have diabetes. The prevalence of impaired glucose tolerance (IGT) is also high in this group, however, incidence of new diabetes following CABG surgery is unknown. OBJECTIVES: To determine incidence of new diabetes and the impact on ICU and hospital stay in patients undergoing CABG surgery in India, we performed a registry-based study. METHODS: Prospectively collected data among consecutive adult cardiac surgical patients who underwent CABG surgery at a single hospital were analyzed. Descriptive statistics are reported. RESULTS: We recruited 1559 consecutive patients (men 1355, women 204) and analyzed data among 933 non-diabetic patients. Patients with known diabetes (n = 626, 40%) were excluded. 57 (6.1%) of the 933 non-diabetic patients developed persistently high glucose levels at discharge with incidence rate of 61 + 5/1000. Patients who developed diabetes had similar age and body mass index vs those who did not, but had greater preoperative IGT (44.6 vs 13.7%) and more time-period in intensive care unit (102.0 + 75 vs 80.2 + 29 hours) as well as in hospital (11.7 + 5.7 vs 9.6 + 2.4 days) (p < 0.001). CONCLUSION: In a significant proportion of non-diabetic patients diabetes is unmasked after CABG. This is more likely in those with impaired glucose tolerance and prolonged period in intensive care and hospital.