Definition:- Sudden, unexpected loss of heart function, breathing and consciousness. (OR). It is defined as the cessation of effective pumping action of heart. Which commonly occurs when the muscles fibres of ventricles start to beat rapidly without any blood ( ventricle fibrillation ) or when the heart stop beating completely (asystole). … Continue readingCardiac arrest, Definition of Cardiac arrest, Causes and Symptoms, Diagnosis & Complications, Management, (By GS India Nursing).