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Prevalence and predictors of appropriate implantable cardioverter defibrillator therapy in chronic left ventricular dysfunction patients for primary prevention of sudden cardiac death in Siriraj Hospital.

OBJECTIVE
The purpose of the present study was to identify the prevalence and predictors offirst appropriate implantable cardioverter defibrillator (ICD) therapy in patients with chronic LV dysfunction after placement of lCD for primary prevention.


MATERIAL AND METHOD
Retrospective design was used. Patients (n = 115) from Siriraj Hospitals with ischemic or non-ischemic cardiomyopathy who underwent ICD implantation for primary prevention were studied. Clinical data and ICD therapy data were obtained from medical records and lCD interrogation reports.


RESULTS
First appropriate ICD therapy for ventricular tachycardia (VT) or ventricular fibrillation (VF) were seen in 22 patients (19%) of whom 11 (9.5%) received lCD shock and 11 patients (9.5%) received anti-tachycardic pacing. Lack of beta-blocker use and lack ofaldosterone antagonist use were identified as significant predictors of appropriate therapy. There was no difference in prevalence of appropriate ICD therapy between ischemic and non-ischemic groups. The freedom from first appropriate therapy at 1, 2 and 3 years was 88%, 80% and 78%. The freedom rate was constant after the third year


CONCLUSION
Nearly one-fifth of chronic LV dysfunction patients with primary prevention ICD implantation experience appropriate ICD therapy. Most first appropriate ICD therapy occurs within 2 years after implantation. Lack ofbeta-blocker use and lack of aldosterone antagonist use were significant predictors of appropriate therapy.