Return of spontaneous circulation
From Infogalactic: the planetary knowledge core
Return of spontaneous circulation (ROSC) is resumption of sustained perfusing cardiac activity associated with significant respiratory effort after cardiac arrest.[1] Signs of ROSC include breathing, coughing, or movement and a palpable pulse or a measurable blood pressure. Cardiopulmonary resuscitation and defibrillation increase the chances of ROSC.[1]
Lazarus phenomenon or autoresuscitation after failed cardiopulmonary resuscitation is the spontaneous return of circulation after resuscitation attempts have stopped in someone with cardiac arrest.[2][3] Thus passive monitoring is recommended for 10 minutes after resuscitation attempts have stopped.[2]