Variability of the heart rate: its physiopathological basis and its use as prognostic index after acute myocardial infarction Variabilidad de la frecuencia cardíaca: sus fundamentos fisiopatológicos y su utilidad como índice pronóstico post-infarto agudo
Author
dc.contributor.author
Vukasovic,
Author
dc.contributor.author
Florenzano Urzúa, Fernando
Admission date
dc.date.accessioned
2019-01-29T16:00:05Z
Available date
dc.date.available
2019-01-29T16:00:05Z
Publication date
dc.date.issued
1995
Cita de ítem
dc.identifier.citation
Revista médica de Chile, Volumen 123, Issue 11, 2018, Pages 1412-1417
Identifier
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00349887
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/163028
Abstract
dc.description.abstract
The analysis of heart rate variability studies the normal oscillatory changes of the cardiac cycle. These changes are periodical or incidental and are controlled by humoral, sympathetic and parasympathetic stimuli. Frequency domain and time domain are the methods most used to assess heart rate variability. Time domain analyses variations of cardiac cycle using the standard deviation of RR intervals in 24 hours (SDRR) and the percentage of difference between adjacent normal RR intervals of more than 50 ms (pNN50). Frequency domain, converts beat to beat fluctuation of heart rate into different components of frequency by a fast Fourier transformation. They are classified, according to their magnitude, in high frequency (> 0.15 Hz), low frequency (0.04-0.15 Hz), very low frequency (0.003-0.04 Hz) and extremely low frequency (< 0.003 Hz). The high frequency fluctuations are predominantly related to parasympathetic activity whereas the low frequency fluctuations are related to sympathetic a
Variability of the heart rate: its physiopathological basis and its use as prognostic index after acute myocardial infarction Variabilidad de la frecuencia cardíaca: sus fundamentos fisiopatológicos y su utilidad como índice pronóstico post-infarto agudo