Нe effectiveness of implantable cardioverter-defibrillator (ICD) in reducing mortality in patients with heart failure and reduced leÑ– ventricular ejection is well documented, so it's now the standard of care in primary and secondary prevention of sudden cardiac death (SCD). Since indications for ICD therapy have expanded, concern about possible adverse eوٴects of ICD therapies is increasing. Shock therapies are closely associated with progressive pump failure and adversely aوٴect patients’ survival irrespective of appropriateness. And also cause anxiety disorder almost one in four patients and also bring about issues which impair QoL such as avoidance behaviors, sedentary lifestyle, sexual problems. Нerefore, minimizing or avoidance of unnecessary and inappropriate ICD shocks remains an important and challenging goal. Dominance of primary prevention indications leads to see that avoidable shocks assumed a relatively larger proportion of total therapy. In order to decrease these avoidable ICD shocks, several studies have focused on specifying the best device programming strategies. Avoidable ICD shocks are indicated to have been reduced by evidences based on the programming of the detection duration, detection rate, ATP algorithms discriminating SVT from VT, and specLÙ½c programming to minimize the sensing of noise.