Linear and nonlinear dynamics of heart rate variability after acute myocardial infarction with normal and reduced left ventricular ejection fraction.
Am J Cardiol
; 77(15): 1283-8, 1996 Jun 15.
Article
en En
| MEDLINE
| ID: mdl-8677867
We analyzed heart rate variability (HRV) in 2 groups of patients after acute myocardial infarction with normal and reduced ejection fraction (EF) by considering both the power of the 2 major harmonic components at low and high frequency and 2 indexes of nonlinear dynamics, namely the 1/f slope and the correlation dimension D2. HRV of patients with a reduced EF was characterized by a diminished RR variance as well as a different distribution of the residual power in all frequency ranges, with lower values of the low-frequency component expressed in both absolute and normalized units, and of the low- to high-frequency ratio. In these patients we also observed a steeper slope of the negative regression line between power and frequency in the very low frequency range. The presence of a smaller fractal dimension was suggested by a lower D2. Thus, in patients after acute myocardial infarction with a reduced EF, the reduction in HRV is associated with a different distribution of the residual power in the entire frequency range, which suggests a diminished responsiveness of sinus node to neural modulatory inputs.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Volumen Sistólico
/
Procesamiento de Señales Asistido por Computador
/
Función Ventricular Izquierda
/
Electrocardiografía Ambulatoria
/
Disfunción Ventricular Izquierda
/
Frecuencia Cardíaca
/
Infarto del Miocardio
Tipo de estudio:
Diagnostic_studies
/
Observational_studies
/
Risk_factors_studies
Límite:
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Am J Cardiol
Año:
1996
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Estados Unidos