title: [The Q wave in the electrocardiogram: necrosis or an electrically inactive area? Myocardial pseudoinfarct].
abstract: Six patients with Q-wave myocardial infarction in the ECG, two with coronary disease, two with metabolic alterations, one with acute myocarditis and another with ischemic stroke had an improvement of ECG tracings with disappearance of the Q wave. All had normal plasmatic levels of CPK and CKMB. It is believed that metabolic transitory disturbance of the myocardium increases the rest transmembrane potential turning the cell nonresponsive to electrical stimulus and without mechanical activity (inactive electrical zone, not a necrosis zone, which is an anatomo-pathological diagnosis).
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo.
authors.forename: R A
authors.initials: RA
authors.lastname: Franken
authors.forename: M A
authors.initials: MA
authors.lastname: Assef
authors.forename: F de P
authors.initials: Fde P
authors.lastname: Stella
authors.forename: S M
authors.initials: SM
authors.lastname: Gandra
authors.forename: L A
authors.initials: LA
authors.lastname: Rivetti
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004562:Electrocardiography / Q000295:instrumentation; D004594:Electrophysiology; D005260:Female; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D009206:Myocardium / Q000473:pathology*; D009336:Necrosis
vernacular_title: Onda Q do eletrocardiograma: necrose ou zona eletricamente inativa? O pseudo-infarto do miocárdio.