title: [Late potentials in patients with myocardial infarction subjected to coronary thrombolysis].
abstract: OBJECTIVE
  Analyse the behavior of the late potentials (LP) in patients submitted to thrombolysis with success.
  
  
  METHODS
  Thirty-five patients with acute myocardial infarction, 32 (91.4%) male with ages varying from 33 to 68 (mean 52.6). Thrombolysis was obtained during cinecoronarography with intravenous infusion "in bolus" of doses of 50 mg, 60 mg and 70 mg of rt-PA, with a new bolus of 30 mg at 60 minutes after the procedure. A new angiographic study was performed 12-48 hours late. The high resolution ECG was taken with the ART system model 1200 EPX, before, after and 72 hours later. The presence of electrical activity in the last 40 ms of the QRS complex with less than 20 mu volts in amplitude and more than 35 ms in duration characterized the LP.
  
  
  RESULTS
  LP was observed in 16 (46%) patients during the phase of arterial occlusion. LP was recorded only in 23% after recanalization and in 26% when the infarcted related artery (IRA) remain opened. The reduction in the LP was 43.5%. Only one patient with LP had threatening arrhythmia.
  
  
  CONCLUSIONS
  In patients with demonstrated thrombotic occlusion of the IRA, the recanalization diminished the incidence of LP in 43.5% of the patients. Further studies are necessary to achieve the exact clinical importance of these findings.
authors: Instituto do Coração do Hospital das Clínicas-FMUSP.
authors: G
authors: G
authors: Bellotti
authors: B
authors: B
authors: Tranchesi
authors: P
authors: P
authors: Moffa
authors: B
authors: B
authors: Caramelli
authors: W I
authors: WI
authors: Pereira
authors: C P
authors: CP
authors: De Albuquerque
authors: O
authors: O
authors: Gebara
authors: A
authors: A
authors: Jatene
authors: F
authors: F
authors: Pileggi
mesh_terms: D000200:Action Potentials; D000328:Adult; D000368:Aged; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000503:physiopathology*; D015912:Thrombolytic Therapy
vernacular_title: Comportamento dos potenciais tardios em portadores de infarto do miocárdio submetidos à trombólise coronária.