Differences between chest pain observation service patients and admitted "rule-out myocardial infarction" patients

Acad Emerg Med. 1997 Jul;4(7):693-8. doi: 10.1111/j.1553-2712.1997.tb03762.x.


Objective: To compare and contrast the patient characteristics of ED patients at low risk for acute cardiac ischemia who were assigned to a chest pain observation service vs those admitted to a monitored inpatient bed for "rule-out acute myocardial infarction" (R/O MI).

Methods: This was a retrospective, cross-sectional comparison of adult patients considered at relatively low risk for cardiac ischemia and who were evaluated in 1 of 2 settings: a short-term observation service and an inpatient monitored bed. All patients had an ED final diagnosis of "chest pain," "R/O MI," or "unstable angina" during the 7-month study period. Demographic features and presenting clinical features were examined as a function of site of patient evaluation.

Results: Of 531 study patients, 265 (50%) were assigned to the observation service. Younger age (OR = 1.75, 95% CI 1.26, 2.44, for each decrement of 20 years), the complaint of "chest pain" (OR = 2.35, 95% CI 1.34, 4.12), and the absence of prior known coronary artery disease (OR = 1.64, 95% CI 1.13, 2.38) were the principal independent factors associated with assignment to a chest pain observation service bed.

Conclusions: Patients evaluated in a chest pain observation service appear to have different clinical characteristics than other individuals admitted to a monitored inpatient bed for "R/O MI." Investigators should address differences in clinical characteristics when making outcome comparisons between these 2 patient groups.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Analysis of Variance
  • Case Management
  • Chest Pain / diagnosis
  • Chest Pain / epidemiology*
  • Confidence Intervals
  • Cross-Sectional Studies
  • Decision Making*
  • Electrocardiography
  • Emergency Service, Hospital / organization & administration
  • Emergency Service, Hospital / statistics & numerical data*
  • Female
  • Humans
  • Logistic Models
  • Male
  • Middle Aged
  • Monitoring, Physiologic / methods
  • Myocardial Infarction / diagnosis
  • Myocardial Ischemia / diagnosis
  • Myocardial Ischemia / epidemiology*
  • Patient Admission / statistics & numerical data
  • Patient Selection
  • Retrospective Studies
  • Risk Assessment
  • Triage / standards
  • Triage / statistics & numerical data*