it is important to understand that the concomitant use of a non-selective beta-antagonist along with a slow calcium channel blocker may result in Asystole. Asystole is a type of cardiac arrest in which your heart stops beating completely.
Asystole, also known as flatline, is the cessation of electrical and mechanical activity in the heart. Asystole usually develops as a result of a worsening of the initial non-perfusing ventricular rhythms: ventricular fibrillation (V-fib) or pulseless ventricular tachycardia (V-tach). This typically causes you to pass out. It's also possible that you'll stop breathing or take only gasping breaths. Without immediate CPR or medical attention, this condition is fatal.
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