Y gwir trist amdani yw bod cleifion 10% yn llai tebygol o oroesi ataliad y galon y tu allan i'r ysbyty wrth i bob munud fynd heibio. Mae'r cyfraddau goroesi'n isel ond mae yna botensial i lawer mwy o fywydau gael eu hachub, fel y dangosir gan nifer o wledydd eraill sydd wedi cymryd camau gweithgar i wella pob cam yn yr hyn a elwir yn “gadwyn oroesi”. Hwn yw'r rheswm y tu ôl i'r Cynllun hwn a dyna pam y mae mor bwysig inni gymryd camau pendant.
It is a sad fact that a patient’s chance of surviving an out of hospital cardiac arrest decreases by an estimated 10% with every passing minute. Survival rates are low but there is the potential for many more lives to be saved, as has been demonstrated by a number of countries which have taken active steps to improve each stage in what is called “the chain of survival”. This is the reason behind this plan and why it is so important that we take concerted action.