title: Serum cardiac troponin I and ST-segment elevation in patients with acute pericarditis.
abstract: OBJECTIVE
  ST-segment elevation in acute pericarditis is believed to be caused by superficial myocardial inflammation or epicardial injury. We used cardiac troponin I, a sensitive and specific marker of myocardial injury, to assess myocardial lesions in idiopathic acute pericarditis and its relationship to ST-segment elevation.
  
  
  METHODS
  Sixty-nine consecutive patients (53 men, 48+/-17 years) with idiopathic acute pericarditis were included. We used an enzymoimmunoflurometric method to measure serum cardiac troponin I on admission (myocardial infarction threshold was 1.5 ng. ml(-1)).
  
  
  RESULTS
  Cardiac troponin I was detectable in 34 patients (49%) and was beyond the 1.5 ng. ml(-1)threshold in 15 (22%). Coronary angiography performed in seven of these 15 patients was normal in all of them. ST-segment elevation was observed in 93% of the patients with cardiac troponin I >1.5 ng. ml(-1)vs 57% of those without (P<0.01). Sensitivity of ST-segment elevation to detect myocardial injury was 93% and specificity 43%. Patients with a cardiac troponin I increase higher than 1.5 ng. ml(-1)were more likely to have had a recent infection (66% vs 31%;P=0.01) and were younger (37+/-14 vs 52+/-16 years;P=0.002). There was no significant relationship with other parameters such as pericardial friction rub, fever, PR segment abnormalities, echocardiographic findings or C-reactive protein.
  
  
  CONCLUSIONS
  In patients with idiopathic acute pericarditis, an increase in cardiac troponin I is frequently observed, especially in younger patients and those with a recent infection. Although ST-segment elevation does not reliably indicate myocardial injury, a significant cardiac troponin I increase is only seen in these patients.
authors.affiliation: Service de Reanimation et Soins Intensifs de Cardiologie, Hopital Louis Pradel, Lyon, France.
authors.forename: E
authors.initials: E
authors.lastname: Bonnefoy
authors.forename: P
authors.initials: P
authors.lastname: Godon
authors.forename: G
authors.initials: G
authors.lastname: Kirkorian
authors.forename: M
authors.initials: M
authors.lastname: Fatemi
authors.forename: P
authors.initials: P
authors.lastname: Chevalier
authors.forename: P
authors.initials: P
authors.lastname: Touboul
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D002637:Chest Pain / Q000097:blood; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010493:Pericarditis / Q000097:blood*; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D019210:Troponin I / Q000097:blood*
chemical_list: D019210:Troponin I