Table 1.

Management protocols in 6 chest pain evaluation units

Study, year	Duration of protocol, hr	ECG	Biochemical markers	Additional testing
Zalenski et al,9 1997	12	0, 6, and 12 hr	CK-MB at 0, 4, 8, and 12 hr	Exercise tolerance testing (ETT)
Gibler et al,10 1995	9	Continuous ST segment monitor	CK-MB at 0, 3, 6, and 9 hr	2-dimensional echo, ETT
Hoekstra et al,11 1994	9	Continuous ST segment monitor	CK-MB at 0, 3, 6, and 9 hr	Thallium ETT
Doherty et al,12 1994	9	0, 3, 6, and 9 hr	CK-MB at 0, 3, 6, and 9 hr	Cardiology consultation, ETT, thallium ETT, MUGA scan
Mikhail et al,13 1997	8	Continuous ST segment monitor	Total CK at 0 hours; with or without CK-MB at 0, 4, and 8 hr; with or without myoglobin at 0 and 4 hr	ETT, stress echo, dobutamine echo, thallium ETT
Gomez et al,14 1996	9	Continuous ST segment monitor	Total CK and CK-MB at 0, 3, 6, and 9 hr	ETT, dobutamine echo
ECG = electrocardiography; CK-MB = creatine kinase—muscle-brain isoenzymes; echo = echocardiography; MUGA = multigated angiocardiography.