Table 2.

Reasons for Excluding Cases with an ICD-9-CM Code of Acute Myocardial Infarction (AMI) (n = 147)

Reason for Exclusion	n(%)
Diagnosis AMI in the 8 weeks prior to admission	65 (44)
Met symptom criterion only; AMI ruled out	23 (16)
Met electrocardiographic criterion only; AMI ruled out	8 (5)
Met enzyme criterion only; AMI ruled out	7 (5)
AMI more than 5 days prior to admission; admision from home	9 (6)
History of AMI only; not an acute presentation	8 (5)
No mention of AMI in record	7 (5)
Other conditions miscoded as AMI (stroke, n = 3; respiratory arrest, n = 5; pulmonary embolus, n = 1)	9 (6)
Cardiac arrest associated with other conditions; AMI not clearly documented	6 (6)
Missing laboratory and electrocardiographic data	3 (2)
No laboratory tests or electrocardiogram performed	2 (1)