Estudo da voltagem do QRS em 12 derivaçöes e do critério Cornell na detecçäo de hipertrofia ventricular esquerda / Evaluation of QRS voltage in 12 derivations and Cornell criteria in the diagnosis of left ventricular hypertrophy

RESUMO

PURPOSE--To search for the existence and degree of correlation between total 12 lead ECG amplitude and the sum of RaVL + SV3 > 28 mm (for men) or > 20mm (for women) and left ventricular hypertrophy (LV mass calculated by echocardiography > 215g for both sexes). METHODS--ECG and echocardiograms of 227 consecutive patients were examined and submitted to statistical analysis searching for correlation between total 12 lead ECG amplitude and Cornell criteria and LV mass (ASE formula modified by Devereux). RESULTS--Patients had ischemic heart disease, hypertension, valvular disease, cardiomyopathy or other less common heart diseases, or had no cardiac illness at all. There was statistically significant association of total 12 lead amplitude > 120mm and Cornell criteria with LV mass > 215g (p = 0.02 and p = 0.01 respectively). Total ECG amplitude showed 74.3//sensitivity, 42.6//specificity, and 52.4//accuracy. Cornell criteria showed values of 37.8//, 82.7//and 68.7//respectively. CONCLUSION--Total 12-lead amplitude presented limited diagnostic performance for detecting LV hypertrophy, as well as did ECG Cornell criteria, although the latter was more specific and more accurate