Nishad Chitnis1, Sudhindra Vooturi2, B Hygriv Rao3. 1. Cardiologist, Dept. of Cardiology, Krishna Institute of Medical Sciences, Hyderabad 500003, India. 2. Physiotherapist and Statistician, Dept. of Physiotherapy, Krishna Institute of Medical Sciences, Hyderabad 500003, India. 3. Director Pacing & Electrophysiology, Dept. of Cardiology, Krishna Institute of Medical Sciences, Hyderabad 500003, India. Electronic address: hygriv@hotmail.com.
Abstract
INTRODUCTION: There is high incidence of SCD in the early period following STEMI. We compared the temporal patterns and predictors of SCD amongst patients with LVEF ≤35% and LVEF >35%. METHODS: Data from STEMI patients was prospectively collected. SCD cases formed the study cohort and were categorized into 2 groups based on their LV function. RESULTS: There were 929 patients (mean age 55 ± 17 years) with a follow up of 41 ± 16 months. 154 pts (16.6%) had LVEF ≤35% (Group A, LVEF-29.9% ± 6%) and 775 pts had LVEF >35% (Group B, LVEF - 49% ± 14%). The two groups were similar with respect to sex distribution, age, prevalence of hypertension, and mean period of presentation. They differed in incidence of anterior wall MI (77.2% vs 55%), reperfusion (69% vs. 75%), prevalence of diabetes (50.6% vs 42%), and medication non-compliance (34% vs. 13%). The total SCD was 78 [Gp A, 25 (16.2%); Gp B, 53 (6.8%); p < 0.001]. The temporal cumulative SCD related mortality in the 2 groups was 1st month (8% vs. 4% p = 0.075), 3 months (14% vs. 5%, p < 0.001), 6 months (17% vs. 5%, p < 0.001), 1 year (18% vs. 6%, p < 0.001), at end of follow up (27% vs. 8%, p < 0.001). Multivariate predictors of SCD were medication compliance in the first month, and severe LV dysfunction with medication compliance beyond 1st month. CONCLUSION: The incidence of SCD is high in first month after STEMI, irrespective of LV function. The number of SCD is higher in Group B patients. Algorithms to assess risk of SCD in early post STEMI period are urgently needed.
INTRODUCTION: There is high incidence of SCD in the early period following STEMI. We compared the temporal patterns and predictors of SCD amongst patients with LVEF ≤35% and LVEF >35%. METHODS: Data from STEMI patients was prospectively collected. SCD cases formed the study cohort and were categorized into 2 groups based on their LV function. RESULTS: There were 929 patients (mean age 55 ± 17 years) with a follow up of 41 ± 16 months. 154 pts (16.6%) had LVEF ≤35% (Group A, LVEF-29.9% ± 6%) and 775 pts had LVEF >35% (Group B, LVEF - 49% ± 14%). The two groups were similar with respect to sex distribution, age, prevalence of hypertension, and mean period of presentation. They differed in incidence of anterior wall MI (77.2% vs 55%), reperfusion (69% vs. 75%), prevalence of diabetes (50.6% vs 42%), and medication non-compliance (34% vs. 13%). The total SCD was 78 [Gp A, 25 (16.2%); Gp B, 53 (6.8%); p < 0.001]. The temporal cumulative SCD related mortality in the 2 groups was 1st month (8% vs. 4% p = 0.075), 3 months (14% vs. 5%, p < 0.001), 6 months (17% vs. 5%, p < 0.001), 1 year (18% vs. 6%, p < 0.001), at end of follow up (27% vs. 8%, p < 0.001). Multivariate predictors of SCD were medication compliance in the first month, and severe LV dysfunction with medication compliance beyond 1st month. CONCLUSION: The incidence of SCD is high in first month after STEMI, irrespective of LV function. The number of SCD is higher in Group B patients. Algorithms to assess risk of SCD in early post STEMI period are urgently needed.
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