Am. Moreno et al., Prognostic significance of advanced atrioventricular block in patients with acute myocardial infarction, MED CLIN, 114(9), 2000, pp. 321-325
BACKGROUND: Advanced atrioventricular block (AB) during acute myocardial in
farction (AMI), characterises a high-risk subgroup of patients. Our aim was
to determine the prognostic significance of AB and its possible peculiarit
ies in relation to infarction localization and/or the thrombolytic therapy.
PATIENTS AND METHODS: The prospective study involved 1,239 patients with AM
I. We studied clinical characteristics, as well as indexes of infarct size,
short and long-term complications.
RESULTS: An was present in 85 (6.8%) patients and was more often associated
with: previous treatment with diuretics, diabetes, inferior localisation,
higher number of ECG leads with elevated ST segment, and higher peak of OK.
The AB was associated with a higher mortality: in-hospital (27% vs 10.6%;
p < 0.01)) and after one-year (31.7% vs 19.4%; p < 0.05). Patients with AB
had a different in-hospital mortality depending on anterior or inferior inf
arct localization (66% vs 18.5%; p < 0.001, respectively). In patients rece
iving thrombolytic treatment (n = 681), the duration of AB was shorter and
in-hospital mortality was lower (13.7% vs 47%, p < 0.11) than that occurred
in patients without this treatment (n = 558). AB had independent value for
predicting in-hospital mortality (OR: 3.56; 95% CI: 1.84-6.90) and one-yea
r mortality (OR: 2.77; 95% CI: 1.52-5.04).
CONCLUSIONS: AB is associated with larger infarcts and higher incidence of
complications. The prognosis is especially poor when it is presented associ
ated with anterior infarction and/or in patients without thrombolytic treat
ment. AB is a variable with independent prognostic value on the mortality.