Thanks for writing to the forum!
“If a cardiac arrest was due to ventricular tachycardia or ventricular fibrillation, survivors are at risk for another arrest, especially if they have underlying heart disease.
Survivors of cardiac arrest must have all causes corrected to prevent future episodes. Possible causes include myocardial ischemia (inadequate blood flow to the heart muscle), arrhythmia (abnormal heart rhythm), etc.
Possible tests and treatments include
• cardiac catheterization
• electrophysiologic tests
• coronary artery bypass surgery
• balloon angioplasty or PCI (PTCA)
• antiarrhythmic medicine
• implantable cardioverter / defibrillator
• implantable pacemaker
• heart transplant” Refer: http://www.americanheart.org/presenter.jhtml?identifier=4741
If by pass is not possible, or there is ventricular tachycardia or fibrillation and the LVF is poor then defibrillator increases the chance of survival. Go with your cardiologist. It is difficult to comment about cardiac conditions based on just discussion on net. In the end you will have to go by what the cardiologist says. What you can do is seek another opinion from another cardiologist.
Please let me know if there is any thing else and do keep me posted. Take care!