Along with last years, most authors were concentrating on ECG Changes presented with Acute Coronary Syndrome. My book will not focus on ST changes that frequently happening with Acute Coronary Syndrome, but will focus on P wave Dispersion, QRS Duration & QT dispersion, their importance, measurements, relation to ischemic event, relation to morbidity and mortality & relation to each other. This work will be beneficial to medical students, cardiologists & Critical care physicians.