This paper proposes a method of efficient assessment of the cardiac risk based on the T-wave statistics obtained from long term Holter ECG recordings. T-wave alternans, T-wave amplitude variability, and related indices are suggested to be utilized for the integrated cardiac risk assessment. The method has been applied to the Holter ECG data taken from 351 patients hospitalized at Fujita Health University Hospital due to acute coronary syndrome. It has been shown that TAVP could differentiate patients with ejection fraction < 40%.