RESUMEN
Heart failure continues to be a major challenge to healthcare; several resting and exercise electrocardiographic parameters have been investigated to predict the left ventricular diastolic dysfunction [LVDD]. One hundred and forty patients, classified into 2 groups according to LVDD, were assessed by measurement of normal and corrected QT interval, T wave peak to T wave End and P wave dispersion in resting ECG. Exercise stress test looking for Hump sign [upward deflection of the ST-segment] was done. The relationships between these ECG parameters and LVDD were investigated. The study revealed significant occurrence of hump sign in patients with LVDD, there was a significant difference between both groups regarding QTc and P wave dispersion. P wave dispersion was significantly higher in patients with LVDD. Sensitivity and specificity of the ST hump sign in prediction of LVDD were 86% and 78% respectively. The study also concluded that P wave dispersion at cut off value of about 0.045 msec had the highest sensitivity [sensitivity 98%; specificity 64%] while QTc at cut off value of 0.395 msec had the highest specificity [sensitivity 81%, specificity 79%]. P wave dispersion and hump sign had higher sensitivity while corrected QT interval had higher specificity in prediction of LVDD