Results 241 to 250 of about 38,746 (266)
Some of the next articles are maybe not open access.
Cerebral Autoregulation in Orthostatic Intolerance
Annals of the New York Academy of Sciences, 2001Abstract: Many of the primary symptoms of orthostatic intolerance (fatigue, diminished concentration) as well as some of the premonitory symptoms of neurally mediated syncope (NMS) are thought to be due to cerebral hypoperfusion. Transcranial Doppler measurements of middle cerebral artery blood velocity (CBV) is at present the only technique for ...
R, Schondorf, J, Benoit, R, Stein
openaire +2 more sources
Cerebral Autoregulation and Syncope
Progress in Cardiovascular Diseases, 2007Whatever the pathogenesis of syncope is, the ultimate common cause leading to loss of consciousness is insufficient cerebral perfusion with a critical reduction of blood flow to the reticular activating system. Brain circulation has an autoregulation system that keeps cerebral blood flow constant over a wide range of systemic blood pressures. Normally,
openaire +2 more sources
Cerebrovascular and brain metabolism reviews, 1990
Autoregulation of blood flow denotes the intrinsic ability of an organ or a vascular bed to maintain a constant perfusion in the face of blood pressure changes. Alternatively, autoregulation can be defined in terms of vascular resistance changes or simply arteriolar caliber changes as blood pressure or perfusion pressure varies.
Paulson, O B +2 more
openaire +1 more source
Autoregulation of blood flow denotes the intrinsic ability of an organ or a vascular bed to maintain a constant perfusion in the face of blood pressure changes. Alternatively, autoregulation can be defined in terms of vascular resistance changes or simply arteriolar caliber changes as blood pressure or perfusion pressure varies.
Paulson, O B +2 more
openaire +1 more source
Phase dynamics in cerebral autoregulation
American Journal of Physiology-Heart and Circulatory Physiology, 2005Complex continuous wavelet transforms are used to study the dynamics of instantaneous phase difference Δφ between the fluctuations of arterial blood pressure (ABP) and cerebral blood flow velocity (CBFV) in a middle cerebral artery. For healthy individuals, this phase difference changes slowly over time and has an almost uniform distribution for the ...
Miroslaw, Latka +5 more
openaire +2 more sources
Clinical Significance of Cerebral Autoregulation
2002Disturbed cerebral autoregulation is believed to be associated with an unfavourable outcome following head injury. Previously, using ICP monitoring and transcranial Doppler ultrasonography, we investigated whether cerebral response to spontaneous variations in arterial pressure (ABP) or cerebral perfusion pressure (CPP) provide reliable information on ...
M, Czosnyka +3 more
openaire +2 more sources
Oxygen-dependent mechanisms in cerebral autoregulation
Annals of Biomedical Engineering, 1985Autoregulatory adjustments in the caliber of cerebral arterioles were studied in anesthetized cats equipped with cranial windows for the direct observation of the pial microcirculation. Increased venous pressure caused slight, but consistent, arteriolar dilation, at normal and at reduced arterial blood pressure and irrespective of whether or not ...
H A, Kontos, E P, Wei
openaire +2 more sources
Cerebral Autoregulation Dynamics in Premature Newborns
Stroke, 1995Background and Purpose Autoregulation of cerebral blood flow is easily disrupted, and loss of this normal physiological reflex may worsen the neurological outcome for patients undergoing intensive care. We studied the response of cerebral blood flow velocity to changes in mean arterial blood pressure.
R B, Panerai +3 more
openaire +2 more sources
Cerebral Blood Flow Autoregulation and Hypertension
The American Journal of the Medical Sciences, 1985Hypertension and antihypertensive therapy have clinically important effects on cerebral blood flow. The autoregulatory changes that occur with chronic arterial hypertension should influence the clinician's choice of antihypertensive agents and the rapidity with which the blood pressure is lowered in order to avoid symptoms of focal or global cerebral ...
G, Reed, M, Devous
openaire +2 more sources
Nonstationarity of dynamic cerebral autoregulation
Medical Engineering & Physics, 2014Dynamic cerebral autoregulation (dCA), the transient response of cerebral blood flow (CBF) to rapid changes in arterial blood pressure (BP), is usually quantified by parameters extracted from time- or frequency-domain analysis. Reproducibility studies of dCA parameters and consideration of the physiological determinants of the dynamic BP-CBF ...
openaire +2 more sources
Ceranapril and cerebral blood flow autoregulation
Journal of Hypertension, 1993To investigate the effect of the new angiotensin converting enzyme inhibitor ceranapril (1 mg/kg) on the cerebral blood flow (CBF) autoregulation in normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHR).Sixteen WKY rats and 16 SHR were given ceranapril 1 mg/ml intravenously and compared with two untreated control groups (n = 16)
Torup, M, Waldemar, G, Paulson, O B
openaire +3 more sources