English: chain of survival
Welsh: y gadwyn oroesi
Subject: Iechyd
Welsh definition: A series of actions that, properly executed, reduce the mortality associated with cardiac arrest.
Welsh context: Mae gwella canlyniadau'n gofyn am ystod eang o weithgareddau ar draws y gadwyn oroesi, gan gynnwys cydnabod symptomau yn gynnar a galw am help i atal ataliad y galon rhag digwydd.