Your browser doesn't support javascript.
loading
Altered pattern of circadian neural control of heart period in mild hypertension.
Guzzetti, S; Dassi, S; Pecis, M; Casati, R; Masu, A M; Longoni, P; Tinelli, M; Cerutti, S; Pagani, M; Malliani, A.
Afiliação
  • Guzzetti S; Istituto Ricerche Cardiovascolari, Ospedale L. Saccó, Università Milano, Italy.
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.
Assuntos
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
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