A secondary prevention ICD indication includes: syncope plus inducible VT/VF during EP study.

A secondary prevention ICD indication includes: syncope plus inducible VT/VF during EP study.

• A. ST-elevation MI
• B. Ventricular tachycardia on Holter
• C. Syncope plus normal EP study
• D. Syncope plus induced VT/VF during EP study

Answer: (D)

Secondary prevention ICD indications apply when a patient has already experienced a life-threatening ventricular arrhythmia or syncope due to such an arrhythmia, and testing shows a heart that is susceptible to dangerous rhythms. When syncope occurs and an electrophysiology study reveals inducible VT or VF, it confirms the presence of a substrate capable of producing malignant arrhythmias, making an ICD the appropriate preventive therapy. This combination directly demonstrates both a prior clinical event and a provoked dangerous rhythm, aligning with the criteria for secondary prevention. The other scenarios don’t fit as clearly: ST-elevation MI is an acute event and doesn’t by itself establish a risk of recurrent VT/VF managed by an ICD. Ventricular tachycardia detected on a Holter monitor shows VT but without a prior life-threatening event or inducible substrate it doesn’t demonstrate secondary prevention candidacy. Syncope with a normal EP study implies no inducible arrhythmia substrate found during testing, making ICD indication for secondary prevention less appropriate.

Secondary prevention ICD indications apply when a patient has already experienced a life-threatening ventricular arrhythmia or syncope due to such an arrhythmia, and testing shows a heart that is susceptible to dangerous rhythms. When syncope occurs and an electrophysiology study reveals inducible VT or VF, it confirms the presence of a substrate capable of producing malignant arrhythmias, making an ICD the appropriate preventive therapy. This combination directly demonstrates both a prior clinical event and a provoked dangerous rhythm, aligning with the criteria for secondary prevention.

The other scenarios don’t fit as clearly: ST-elevation MI is an acute event and doesn’t by itself establish a risk of recurrent VT/VF managed by an ICD. Ventricular tachycardia detected on a Holter monitor shows VT but without a prior life-threatening event or inducible substrate it doesn’t demonstrate secondary prevention candidacy. Syncope with a normal EP study implies no inducible arrhythmia substrate found during testing, making ICD indication for secondary prevention less appropriate.