Cardiac standstill and Cardiac arrest

Cardiac arrest and cardiac standstill are semantically related. In some cases you can use "Cardiac arrest" instead a noun "Cardiac standstill".

Cardiac arrest noun - Absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death.

Cardiac standstill and cardiac arrest are semantically related. You can use "Cardiac standstill" instead a noun phrase "Cardiac arrest".