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Definition: The cessation of effective pumping action of the heart. This may be because the heart stops beating altogether (asystole), because there is normal electrical activity without mechanical pumping activity (pulseless electrical activity), or because there is rapid, chaotic, ineffective electrical and mechanical activity of the heart (ventricular fibrillation or ventricular tachycardia). There is abrupt loss of consciousness, absence of the pulse, and breathing stops.
Notes: Nid yw ataliad y galon yn gyfystyr â thrawiad ar y galon.
