Altered pattern of circadian neural control of heart period in mild hypertension.
J Hypertens
; 9(9): 831-8, 1991 Sep.
Article
em En
| MEDLINE
| ID: mdl-1663984
ABSTRACT
We addressed the problem of the circadian changes in neural control of heart period in ambulant hypertensive subjects. A running spectral analysis of R-R variability from Holter tapes provided markers of sympathetic, i.e. low-frequency component (LF) almost equal to 0.10 Hz, and vagal, i.e. high-frequency component (HF) almost equal to 0.25 Hz, controlling activities for the 24-h period of the recording. Significant circadian differences were observed in LF between the two groups of subjects:
during night-time rest (0300-0400 h), LF was greater in hypertensives than in normotensives (56 +/- 2 and 48 +/- 2 nu, respectively; P less than 0.05). Furthermore, the difference between daytime and night-time LF values was progressively reduced with increasing severity of the hypertensive state, as assessed by resting arterial pressure levels. Spectral analysis of R-R variability suggests that essential hypertension may be characterized by a reduced day-night oscillation in sympathetic activity than can be quantified non-invasively using this approach.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Ritmo Circadiano
/
Eletrocardiografia
/
Hipertensão
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Humans
Idioma:
En
Ano de publicação:
1991
Tipo de documento:
Article