title: [The non Q wave myocardial infarction in conventional valvular surgery. Diagnosis with cardiac troponin I].
abstract: BACKGROUND
  Morbidity and mortality in elective valve surgery is still significant. The main cause of death in these patients is cardiogenic shock, of which the most frequent etiology is acute myocardial infarction (AMI) with Q wave in the ECG. However, there are patients with cardiogenic shock without Q wave in the ECG and with rises in CK-MB enzyme that makes us suspect non-Q wave AMI.
  
  
  OBJECTIVE
  To analyze the use of the determination of cardiac troponin-I, a more specific marker of AMI than CK-MB after cardiac surgery, to detect perioperative non-Q wave AMI, and to establish its clinical significance.
  
  
  METHODS
  A total of 147 patients without coronary artery disease scheduled for elective valve surgery were included. We used, based in anterior publications, ECG (presence or not of new Q wave) and cardiac troponin I to define perioperative AMI. Levels of cardiac troponin-I were analysed before surgery and 14 hours after. Non-Q wave AMI was diagnosed when troponin I was superior to 38.85 ng/ml and there was not a phatologic Q wave in ECG.
  
  
  RESULTS
  One hundred twenty-three (83.67%) of patients did not have AMI, 9 (6.12%) suffered perioperative AMI with Q wave, and 15 (10.27%) carried out criteria of non-Q wave perioperative AMI. Morbidity and mortality in this last group was similar to that in the group with Q wave AMI. Morbidity and mortality were minimum in patients without AMI.
  
  
  CONCLUSIONS
  This study suggest the possibility of in vivo identification of non-Q wave perioperative AMI, an entity with important morbidity and mortality in our series, with a simple determination of cardiac troponin I 14 hours after surgery.
authors.affiliation: Servicios de Cirugía Cardiovascular, Hospital Universitario de Gran Canaria Dr. Negrín, Las Palmas de Gran Canaria, Spain. gponce@correo.hpino.rcanaria.es
authors.forename: G
authors.initials: G
authors.lastname: Ponce
authors.forename: J L
authors.initials: JL
authors.lastname: Romero
authors.forename: G
authors.initials: G
authors.lastname: Hernández
authors.forename: A
authors.initials: A
authors.lastname: Padrón
authors.forename: E
authors.initials: E
authors.lastname: Cabrera
authors.forename: C
authors.initials: C
authors.lastname: Abad
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D004562:Electrocardiography; D005260:Female; D006351:Heart Valves / Q000601:surgery*; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood / Q000175:diagnosis* / Q000401:mortality; D011183:Postoperative Complications / Q000097:blood / Q000175:diagnosis* / Q000401:mortality; D012770:Shock, Cardiogenic / Q000097:blood / Q000175:diagnosis / Q000401:mortality; D019210:Troponin I / Q000097:blood*
chemical_list: D015415:Biomarkers; D019210:Troponin I