title: Diagnostic value of contrast-enhanced cardiac magnetic resonance in patients with acute coronary syndrome with normal coronary arteries.
abstract: OBJECTIVE
  To evaluate retrospectively the diagnostic value of cardiac magnetic resonance (CMR) in patients with acute coronary syndromes (ACS) with normal coronary arteries, without pre-existing comorbidities.
  
  
  METHODS
  We retrospectively reviewed the contrast-enhanced (CE) CMR images of 143 patients (70 males and 73 females, mean age 63 years, age range 37-87), within a server of 1590 patients, between January 2012 and January 2014. Only patients with ACS (anginal episode lasting at least 30 min) with normal coronary arteries were included, as well as patients with serologic assay of positive troponin I (TnI) and possible changes in ECG, particularly ST elevation. All patients with a history of ACS, or chronic troponin elevation, dyslipidemia, smoking, patients with cardiomyopathies or preexisting comorbidities such as diabetes, hereditary collagenopathies, amyloidosis, sarcoidosis, hemosiderosis or other infiltrative diseases were excluded to avoid possible bias.
  
  
  RESULTS
  The CMR LGE pattern attributable to AMI occurred in 40/143 cases (28 %) and in particular involved only a myocardial segment (60 %). The MR pattern of acute myocarditis occurred in 16/143 (11.2 %); in 6/143 cases, Tako-Tsubo cardiomyopathy was present. Eighty-one cases out of 143 presented a CMR with no LGE, parietal edema or morphological alterations (56.6 %).
  
  
  CONCLUSIONS
  In patients with a first episode of ACS with normal coronary arteries, in the absence of pre-existing comorbidities, CMR has a high negative predictive value, often without significant alterations. In particular, the CMR LGE for AMI is infrequent and has predominantly focal distribution. However, further multidisciplinary studies are needed to define the prognostic value of CMR.
authors.affiliation: Department of Radiology, Parma Hospital, University of Parma, Via Gramsci, 14, 43100, Parma, Italy, lukas_red@hotmail.it.
authors.forename: Luca
authors.initials: L
authors.lastname: Saba
authors.forename: Federica
authors.initials: F
authors.lastname: Fellini
authors.forename: Massimo
authors.initials: M
authors.lastname: De Filippo
mesh_terms: D054058:Acute Coronary Syndrome / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003331:Coronary Vessels / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D014336:Troponin / Q000097:blood
chemical_list: D014336:Troponin