Cardiac arrest and Congestive heart failure

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.

Congestive heart failure and cardiac arrest are semantically related in heart attack topic. In some cases you can use "Congestive heart failure" instead a noun phrase "Cardiac arrest".

Congestive heart failure noun - Inability to pump enough blood to avoid congestion in the tissues.

Cardiac arrest and congestive heart failure are semantically related in heart failure topic. You can use "Cardiac arrest" instead a noun phrase "Congestive heart failure", if it concerns topics such as heart attack.