A more detailed summary of treatments for coro- nary artery spasm can be found in other guideline 2. Patients with coronary artery spasm who survive an SCA are a high-risk population.S7.1.1.1-5 Recurrent VA, even life-threatening, may be prevented if coronary artery spasm can be effectively addressed with risk factor modification, smoking cessation, and ongo- ing treatment with nitrates and dihydropyridine cal- cium channel blockers.S7.1.1.1-9 However, SCA or VA can recur despite medical therapy or if compliance is poor. Whether a wearable cardioverter-defibrilla- tor may provide protection while medical therapy is being evaluated has not been assessed but is of An ICD can terminate VT/VF initi- ated by spasm, potentially preventing SCD. 3. Patients with coronary vasospasm who survive an SCA are a high-risk population, and some sup- port the use of an ICD in those patients based on the reported event rates from observational stud- even before determining the patient s response to or compliance with medical therapy. Recurrent SCA can occur despite medical therapy. Regardless of the approach, risk factor modifica- tion (eg, illicit drug use), smoking cessation, and ongoing treatment with dihydropyridine calcium channel blockers with or without nitrates repre- sent essential treatments.S7.1.1.1-9 7.1.1.2. Post CABG VT/VF The incidence of sustained VT or VF early after CABG is low, but these VAs are associated with high in-hospital VF occurring very early (intraoperatively or within 24 hours postoperatively) may be due to the transient effects of reperfusion, electrolyte and acid base disturbances, and the use of inotropes. 