CEREBRAL AUTOREGULATION IS A NONLINEAR TYPE CONTROL SYSTEM
نویسندگان
چکیده
منابع مشابه
Cerebral autoregulation of preterm neonates--a non-linear control system?
The low frequency cerebral blood flow velocity (CBFV) oscillations in neonates are commonly attributed to an under-dampened immature linear type cerebral autoregulation, and the 'instability' is regarded as causative for peri-intraventricular haemorrhage/periventricular leukomalacia. In contrast, oscillations susceptible to frequency entrainment are a fundamental part of the stable function of ...
متن کاملWhy is the neural control of cerebral autoregulation so controversial?
Cerebral autoregulation refers to the mechanisms that act to keep cerebral blood flow (CBF) constant during changes in blood pressure. The mechanisms of cerebral autoregulation, especially in humans, are poorly understood but are undoubtedly multifactorial and likely reflect many redundant pathways that potentially differ between species. Whether sympathetic nervous activity influences CBF and/...
متن کاملDynamic cerebral autoregulation is unaffected by aging.
BACKGROUND AND PURPOSE Normal aging is associated with marked changes in the cardiovascular and cerebrovascular systems. Although cerebral autoregulation (CA) is impaired in certain disease states, the effect of age per se on dynamic CA in humans is unknown and the focus of this study. METHODS Twenty-seven young subjects (/=55 years), matched for sex and s...
متن کاملLinear and nonlinear analysis of human dynamic cerebral autoregulation.
The linear dynamic relationship between systemic arterial blood pressure (ABP) and cerebral blood flow velocity (CBFV) was studied by time- and frequency-domain analysis methods. A nonlinear moving-average approach was also implemented using Volterra-Wiener kernels. In 47 normal subjects, ABP was measured with Finapres and CBFV was recorded with Doppler ultrasound in both middle cerebral arteri...
متن کاملDynamic cerebral autoregulation after intracerebral hemorrhage: A case-control study
BACKGROUND Dynamic cerebral autoregulation after intracerebral hemorrhage (ICH) remains poorly understood. We performed a case-control study to compare dynamic autoregulation between ICH patients and healthy controls. METHODS Twenty-one patients (66 ± 15 years) with early (< 72 hours) lobar or basal ganglia ICH were prospectively studied and compared to twenty-three age-matched controls (65 ±...
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ژورنال
عنوان ژورنال: Pediatric Research
سال: 1994
ISSN: 0031-3998,1530-0447
DOI: 10.1203/00006450-199402000-00125