cardiac arrest [cardiac arrests](cessation of the heartbeat resulting in the loss of effective circulation of the blood) noun [UK: ˈkɑː.dɪæk ə.ˈrest] [US: ˈkɑːr.di.ˌæk ə.ˈrest]
heart failure(chronic inability of the heart) noun [UK: ˈhɑːt.ˌfeɪ.ljə] [US: ˈhɑːt.ˌfeɪ.ljə]