Table 1

Management protocols in six chest pain evaluation units

First author	Duration of protocol (h)	ECG	Biochemical markers	Additional testing
ETT, exercise tolerance test; echo, echocardiogram.
Zalenski⁹	12	0, 6, 12 hours	CK-MB at 0, 4, 8, 12 hours	ETT
Gibler¹⁰	9	Continuous ST segment monitor	CK-MB at 0, 3, 6, 9 hours	2-D echo, ETT
Hoekstra¹¹	9	Continuous ST segment monitor	CK-MB at 0, 3, 6, 9 hours	Thallium ETT
Doherty¹²	9	0, 3, 6, 9 hours	CK-MB at 0, 3, 6, 9 hours	Cardiology consult, ETT,
				Thallium ETT, MUGA scan
Mikhail¹³	8	Continuous ST segment monitor	Total CK at 0 hours	ETT, Stress echo
			+/− CK-MB at 0, 4, 8 hours	Dobutamine echo,
			+/− myoglobin at 0, 4 hours	Thallium ETT
Gomez¹⁴	9	Continuous ST segment monitor	Total CK + CK-MB at 0, 3, 6, 9 hours	ETT, Dobutamine echo