A new performance indicator for acute myocardial infarction.
OBJECTIVE
To develop a performance indicator for acute myocardial infarction which would reliably measure success of treatment and which might provide an alternative to case fatality as an audited outcome.


METHODS
A two year audit of all cases of acute myocardial infarction and resuscitated cases of out of hospital cardiac arrest from coronary heart disease in patients under 75 years of age. Behaviour of patients in calling for help, performance of the ambulance services in treating out of hospital arrest, and of the hospitals in providing resuscitation and thrombolytic treatment are audited separately.


METHODS
Four district general hospitals. AUDITED INTERVENTIONS: Resuscitation from cardiac arrest and thrombolytic treatment.


METHODS
Hospital case fatality and lives saved/1000 patients treated.


RESULTS
Overall, the lives of 83/1000 patients were saved (95% confidence interval 70 to 96). Of these, 29 (35%) were saved by out of hospital resuscitation and 38 (46%) by in hospital resuscitation from cardiac arrest. It was estimated that 16 lives (19%) were saved by thrombolytic treatment. There were no significant differences in case fatality among the hospitals.


CONCLUSIONS
Lives saved/1000 patients treated is an easily measurable index and assesses performance of the ambulance service as well as of the hospital. Because it is relatively insensitive to diagnostic definitions, it may provide a robust alternative to case fatality as a performance indicator.
Royal Sussex County Hospital, Cardiac Research Department, 1 Abbey Road, Brighton, East Sussex BN2 1ES, UK. robin.norris@talk21.com
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D000552:Ambulances; D003362:Cost-Benefit Analysis; D004632:Emergency Medical Services / Q000191:economics; D004636:Emergency Service, Hospital; D006323:Heart Arrest / Q000628:therapy; D006801:Humans; D008485:Medical Audit; D009203:Myocardial Infarction / Q000191:economics / Q000628:therapy*; D010043:Outcome and Process Assessment, Health Care; D012151:Resuscitation / Q000191:economics; D016019:Survival Analysis; D015912:Thrombolytic Therapy / Q000191:economics; D006113:United Kingdom