["Little data exists on whether the physicians' skills in responding to cardiac arrest are fully developed after the advanced cardiac life support (ACLS) course, or if there is a significant improvement in their performance after an initial learning curve.", 'To estimate the effect of physician experience on the results of prehospital cardiac arrests.', 'Prospective data were collected on all prehospital resuscitative attempts in the area by ACLS-trained ambulance physicians.', 'Of 232 attempted cardiac resuscitations, 96 (41%) patients survived to hospital admission and 44 (19%) were discharged alive. A group of 39 physicians responded to from one up to 29 cases with a mean of four cases. Physicians responding to five or fewer cases had a trend to fewer patients surviving to admission compared with those responding to six or more (36 vs. 45%, P=0.31) but no difference was found on survival to discharge (19 vs. 20%, P=0.87).'] Does physician experience in addition to ACLS training significantly affect the outcome of prehospital cardiac arrest?