title: Endogenous digoxin-like factor in acute myocardial infarction.
abstract: OBJECTIVE
  The aim of the study was to test the hypotheses that the concentrations of endogenous digoxin-like factor (EDLF) are (i) increased in the initial period after acute myocardial infarction (AMI) and (ii) may contribute to the genesis of ventricular arrhythmias.
  
  
  METHODS
  Consecutive sample study.
  
  
  METHODS
  An 800-bed city teaching hospital, primary hospitalized care centre.
  
  
  METHODS
  Fifty-four consecutive patients of both sexes with a first transmural AMI, 16 male patients with unstable angina pectoris and eight healthy subjects.
  
  
  METHODS
  None.
  
  
  METHODS
  Time-course of the changes of plasma concentrations of EDLF (DELFIA digoxin fluoroimmunoassay) in patients during days 1-14 after uncomplicated AMI and AMI complicated with ventricular fibrillation and congestive heart failure.
  
  
  RESULTS
  Plasma concentrations of EDLF in patients on the 1st day after AMI were increased (1.25 +/- 0.26 ng ml-1 digoxin equivalents, P < 0.025) as compared with both healthy controls (0.34 +/- 0.06 ng ml-1) and patients with unstable angina pectoris (0.40 +/- 0.08 ng ml-1). On the 1st day after AMI the plasma levels of EDLF in seven patients with primary ventricular fibrillation were higher (2.54 +/- 0.67 ng ml-1, P < 0.05) than in 47 patients without ventricular fibrillation (1.05 +/- 0.27 ng ml-1). In 14 patients with AMI and congestive heart failure (class III, Killip), plasma concentrations of EDLF were significantly lower (0.32 +/- 0.09 ng ml-1, P < 0.01) than in 40 patients with AMI without congestive heart failure (1.51 +/- 0.32 ng ml-1). Starting from the 2nd day of AMI, plasma EDLF decreased to the level of the control values (0.35 +/- 0.04 ng ml-1) and did not change during a 2-week period of observation.
  
  
  CONCLUSIONS
  The results show an increase of plasma EDLF during the 1st day after AMI, and that higher plasma EDLF may be associated with the development of ventricular arrhythmias.
authors.affiliation: Division of Cardiology, I. I. Dzhanelidze Research Institute of Emergency Medicine, St Petersburg, Russian Federation.
authors.forename: A Y
authors.initials: AY
authors.lastname: Bagrov
authors.forename: E A
authors.initials: EA
authors.lastname: Kuznetsova
authors.forename: O V
authors.initials: OV
authors.lastname: Fedorova
mesh_terms: D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000097:blood / Q000209:etiology; D001798:Blood Proteins / Q000378:metabolism*; D002298:Cardenolides; D004077:Digoxin; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000150:complications; D012503:Saponins; D000254:Sodium-Potassium-Exchanging ATPase / Q000037:antagonists & inhibitors; D013997:Time Factors
chemical_list: D001798:Blood Proteins; D002298:Cardenolides; D012503:Saponins; C034504:digoxin-like factors; D004077:Digoxin; D000254:Sodium-Potassium-Exchanging ATPase