Análise da prevalência dos potenciais tardios ventriculares na fase tardia pós-infarto do miocárdio baseada na localização do infarto / Analysis of the prevalence of ventricular late potentials in the late phase of myocardial infarction based on the site of infarction
Arq. bras. cardiol
;
78(4): 352-363, Apr. 2002. tab
Article
in Portuguese, English
| LILACS
| ID: lil-306451
RESUMO
OBJECTIVE: The initial site of myocardial infarction (MI) may influence the prevalence of ventricular late potentials (VLP), high-frequency signals, due to the time course of ventricular activation. The prevalence of VLP in a period of more than 2 years after acute MI was assessed focusing on the initially injured wall . METHODS: The prevalence of VLP in a late phase after MI (median of 924 days) in anterior/antero-septal and inferior/infero-dorsal wall lesion was analyzed using signal-averaged electrocardiogram in time domain. The diagnostic performance of the filters employed for analysis on was tested at high-pass cut-off frequencies of 25 Hz, 40 Hz and 80 Hz. RESULTS: The duration of the ventricular activation and its terminal portion were larger in inferior than anterior infarction, at high-pass cut-off frequencies of 40 Hz and 80 Hz. In patients with ventricular tachycardia, these differences were more remarked. The prevalence of ventricular late potentials was three times greater in inferior than anterior infarction. CONCLUSION: Late after myocardial infarction, the prevalence and the duration of ventricular late potentials are greater in lesions of inferior/infero-dorsal than anterior/antero-septal wall confirming their temporal process, reflecting their high-frequency content
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Action Potentials
/
Tachycardia, Ventricular
/
Myocardial Infarction
Type of study:
Prevalence study
/
Risk factors
/
Screening study
Limits:
Female
/
Humans
/
Male
Country/Region as subject:
South America
/
Brazil
Language:
English
/
Portuguese
Journal:
Arq. bras. cardiol
Journal subject:
Cardiology
Year:
2002
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual do Rio de Janeiro/BR
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