Cardiovascular medicine
Safe discharge from the cardiac emergency room with a rapid
rule-out myocardial infarction protocol using serial
CK-MBmass
R Bholasingh, R J de Winter, J C Fischer, R W Koster, R J G Peters, G T Sanders
Department of
Cardiology, Academic Medical Centre, Meibergdreef 9, 1105 AZ Amsterdam,
Netherlands
Correspondence to: Dr Bholasingh r.bholasingh{at}amc.uva.nl
Accepted 12 September
2000
OBJECTIVE
To determine whether a new
protocol, using a rapid and sensitive CK-MBmass assay and
serial sampling, can rule out myocardial infarction in patients with
chest pain and decrease their length of stay in the cardiac emergency
room without increasing risk.
DESIGN
The combined incidence of
cardiac death and acute myocardial infarction at 30 days, six months,
and 24 months of follow up were compared between patients discharged
home from the cardiac emergency room after ruling out myocardial
infarction with a CK-MBactivity assay in 1994 and those
discharged home after a rapid CK-MBmass assay in 1996.
SETTING
Cardiac emergency room of a
large university hospital.
PATIENTS
In 1994 and 1996, 230 and
423 chest pain patients, respectively, were discharged home from the
cardiac emergency room with a normal CK-MB and an uneventful
observation period.
RESULTS
The median length of stay in
the cardiac emergency room was significantly reduced, from 16.0 hours
in 1994 to 9.0 hours in 1996 (p < 0.0001). Mean event rates in
patients from the 1994 and 1996 cohorts, respectively, were 0.9% (95%
confidence interval (CI)
0.3% to 2.1%)
v 0.7% (95% CI
0.1% to 1.5%) at 30 days, 3.0% (95% CI 0.8% to 5.2%) v 2.8%
(95% CI 1.2% to 4.4%) at six months, and 7.0% (95% CI 3.7% to
10.3%) v 5.7% (95% CI 3.5% to 7.9%) at
24 months. Kaplan-Meier survival analysis showed no difference in mean
event-free survival at 30 days, six months, and 24 months of follow up.
CONCLUSIONS
Using a rule-out
myocardial infarction protocol with a rapid and sensitive
CK-MBmass assay and serial sampling, the length of stay of
patients with chest pain in the cardiac emergency room can be reduced
without compromising safety.
Keywords: length of stay; cardiac emergency room; creatine kinase-MB; myocardial infarction
© 2001 by Heart
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