Assessment of prognosis in myocardial infarction: norris coronary prognostic index versus QRS scoring system

ABSTRACT

40 patients with acute myocardial infarction were studied. They were divided into five subgroups on the basis of Norris Coronary Prognostic Index [CPI], and into two subgroups, i.e., Group A or high risk group and group B or low risk group on the basis of LVEF calculated from QRS scoring system. They were followed up for one year and mortality rate was noted in each subgroup of the two methods. There were total eight deaths [20%] and QRS scoring system was able to predict correctly [100%] to segregate all these patients into group A. While Norris CPI method was unable to segregate clearly these patients into prognostically different subgroups. Mortality rate did not show linear relationship with the CPI score or its individual factors. The prediction of prognosis by QRS scoring system was statistically significant, while by Norris CPI was insignificant. QRS scoring system is superior to Norris CPI and can be used reliably to predict the prognosis after acute myocardial infarction. Hence ECG can provide important indirect quantitative information about left ventricular function