[The Wenckebach phenomenon in patients with acute myocardial infarction].
To show the incidence of second degree Auriculoventricular block (AVB) with Wenckebach phenomenon (WF) 1336 patients with acute myocardial Infarction (AMI) were studied. We found 67 cases with WF 5.0% from the total group of AMI and the 33.83% form the group with any type of AVB. Fifty three were male and 14 female (4:1). 77.5% arrived to ICU for their first AMI and 22.38% for their second AMI. 43.26% were posteroinferior with extension to right ventricule; 36.0% pare posteroinferior, 10.4% anterolateral; 9.0% posterolaterals and 1.4% lateral. The onset time of WF in relation to the AMI set was 64.2% in the first 24 hours; and 17.9% for the 24-48 hour group as well as for those over 48 hours. The duration of the WF in 43.3% was lees than 24 hours 19.4%; between 24-48 hours; 25.4% more than 48 hours and 11.9% was transient. The WF was always present with heart rate under 110x'. In 9 patients it occurred with sinus bradycardia with a 48 to 40x' heart rate. The QRS duration was from 80 to 90 msec in 91.0% and from 100 to 120 msec in 9.0%; 4.47% of them had right bundle branch block previous to WF. 10.4% had progression to Mobitz II and 11.9% lead to complete AVB. Mortality was the 2.98% in the group their first AMI; and 4.47% in the group with their second AMI.
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Instituto Nacional de Cardiología Ignacio Chávez, México, D.F.
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D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006327:Heart Block / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000503:physiopathology*; D012849:Sinoatrial Node / Q000503:physiopathology*; D013997:Time Factors
El fenómeno de Wenckebach en el paciente con infarto agudo del miocardio.