I am a paramedic and deal with external pacemaker/defibrillator every day. If the cardiologist knows he is being shocked daily, he has checked that the defib is not failing. Your dads heart is going into ventricular fibrillation
or vent. tachycardia
causing the defib to shock his heart into a livable rhythm. I have never heard of this happening daily. We get 911 calls all the time for implanted defib going off and we always take them to hospital, so I am surprised he is not admitted to hospital. It cant hurt for a second opinion
, but it sound like you would be wasting valuable time.