['Advanced cardiac life support (ACLS) training was introduced to bring order and a systematic approach to the treatment of cardiac arrest by professional responders. In spite of the wide dissemination of ACLS training, it has been difficult to demonstrate improved outcome following such training.', 'To determine the value of formal ACLS training in improving survival from in-hospital cardiac arrest.', 'A multi-center, prospective cohort study examined patient outcomes after resuscitation efforts by in-hospital rescue teams with and without ACLS-trained personnel. A total of 156 patients, experiencing 172 in-hospital cardiopulmonary arrest events over a 38-month period (January 1998 to March 2001) were studied.', 'Primary endpoints included return of spontaneous circulation (ROSC), survival to hospital discharge, 30-day survival, and 1-year survival.', 'The immediate success of resuscitation efforts for all patients was 39.7% (62/156). There was a significant increase in ROSC with ACLS-trained personnel (49/113; 43.4%) versus no ALCS-trained personnel (16/59; 27.1%; p=0.04). Likewise, patients treated by ACLS-trained personnel had increased survival to hospital discharge (26/82; 31.7% versus 7/34; 20.6%; p=0.23), significantly better 30-day survival (22/82; 26.8% versus 2/34; 5.9%; p<0.02), and significantly improved 1-year survival (18/82; 21.9% versus 0/34; 0%; p<0.002).'] Does advanced cardiac life support training improve long-term survival from in-hospital cardiac arrest?