title: Practicality, safety and accuracy of computed tomography coronary angiography in the evaluation of low TIMI-risk score chest pain patients: a pilot study.
abstract: OBJECTIVE
  The present pilot study aimed to assess the practicality, safety and accuracy of performing CT coronary angiography (CT-CA) in the evaluation of acute chest pain of patients with low thrombolysis in myocardial infarction (TIMI) risk scores.
  
  
  METHODS
  The present prospective observational study was undertaken in a university teaching hospital between November 2004 and December 2005. Participants were a convenience sample of patients admitted to hospital for investigation of chest pain with TIMI risk scores <3. Consenting patients underwent CT-CA within 48 h of presentation. Outcomes of interest were practicality (proportion of diagnostic quality scans obtained and preparation time for CT-CA), rate of serious adverse events, and accuracy at the patient level using selective coronary angiography as the reference standard.
  
  
  RESULTS
  Thirty-four patients were recruited. Diagnostic quality scans were obtained in 26/34 or 76% of patients (four failed CT-CA and four non-diagnostic scans). The median CT preparation time was 1.9 h (range 0.17-4.0). No serious adverse events were found. Fourteen of those 26 patients with diagnostic CT-CA subsequently had selective coronary angiography, of which nine were positive. The sensitivity and specificity of CT-CA in identifying patients with significant coronary artery disease were 9/9 (100%; 95% confidence interval 72-100%) and 4/5 (80%; 95% confidence interval 28-100%), respectively.
  
  
  CONCLUSIONS
  The majority of acute chest pain patients with low TIMI risk scores were successfully scanned with a 16-slice CT to produce CT-CA studies with good diagnostic quality and accuracy. No major adverse events were found. The place of CT-CA in diagnostic workup for chest pain remains to be defined.
authors: Centre for Cardiovascular Therapeutics, Western Hospital, Melbourne, Victoria, Australia. kean.soon@wh.org.au
authors: Kean H
authors: KH
authors: Soon
authors: Anne-Maree
authors: AM
authors: Kelly
authors: Nicholas
authors: N
authors: Cox
authors: Lachlan
authors: L
authors: MacGregor
authors: Ivan
authors: I
authors: Chaitowitz
authors: Kevin
authors: K
authors: Bell
authors: Yean
authors: Y
authors: Lim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002637:Chest Pain / Q000000981:diagnostic imaging* / Q000209:etiology; D016001:Confidence Intervals; D017023:Coronary Angiography / Q000379:methods*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications / Q000000981:diagnostic imaging*; D010865:Pilot Projects; D011237:Predictive Value of Tests; D011446:Prospective Studies; D018570:Risk Assessment; D012449:Safety; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed