But the primary performance measure for purple 999 calls will be the percentage of people who have a heartbeat restored after a cardiac arrest which is subsequently retained until arrival at hospital.
Ond y prif fesur perfformiad ar gyfer galwadau 999 porffor fydd canran y bobl y mae curiad eu calonnau’n cael ei adfer a'i gynnal ar ôl ataliad y galon nes iddynt gyrraedd yr ysbyty.