Troponin I in patients without chest pain.
BACKGROUND
Testing for troponin has important clinical value for patients who present with typical symptoms of acute coronary syndromes (ACS) such as chest pain (CP). Much less is known about the value of troponin testing for patients who present with other symptoms of ACS (anginal equivalent symptoms).


METHODS
The utilization and prognostic value of cardiac troponin I (cTnI) were evaluated at a Veterans Affairs Acute Care Facility. Clinical charts of 1184 predominantly male patients, who submitted specimens for initial cTnI testing by AxSYM, were evaluated for demographic data, cardiovascular risk factors, major diseases, and complaints at the time of testing. The endpoint was defined as all-cause death during a 200-day period after initial testing.


RESULTS
Sixty-one percent of cTnI tests were ordered for patients who did not present with CP. Patients presenting with symptoms other than CP did not have significantly lower plasma cTnI than patients with CP. However, patients with symptoms other than CP were rarely diagnosed with ACS unless cTnI was >/=2 microg/L. The mortality during the follow-up period was severalfold higher among patients presenting with symptoms other than CP (CP, 6%; without CP, 22%; P <0.0001, chi(2) test). cTnI >/=0.2 microg/L provided significant additional predictive information for patients who presented with anginal equivalent symptoms such as shortness of breath or general weakness.


CONCLUSIONS
Patients with anginal equivalent symptoms of ACS and low-positive cTnI are less often diagnosed with ACS and have a higher mortality than patients with CP.
Ritter
Detlef
D
Department of Pathology, Saint Louis University School of Medicine, St. Louis, MO 63104, USA. ritterg@slu.edu
Lee
Paul A
PA
Taylor
James F
JF
Hsu
Leo
L
Cohen
Jerome D
JD
Chung
Hyung D
HD
Virgo
Katherine S
KS
D000208:Acute Disease; D000787:Angina Pectoris / Q000175:diagnosis; D002637:Chest Pain / Q000175:diagnosis / Q000401:mortality; D003327:Coronary Disease / Q000175:diagnosis* / Q000401:mortality; D005260:Female; D006333:Heart Failure / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D019210:Troponin I / Q000097:blood*
D019210:Troponin I