This study examined the dynamics of the middle cerebral artery (MCA) blood flow response to hypocapnia in humans (n = 6) by using transcranial Doppler ultrasound. In a control protocol, end-tidal PCO2 (PETCO2) was held near eucapnia (1.5 Torr above resting) for 40 min. In a hypocapnic protocol, PETCO2 was held near eucapnia for 10 min, then at 15 Torr below eucapnia for 20 min, and then near eucapnia for 10 min. During both protocols, subjects hyperventilated throughout and PETCO2 and end-tidal PO2 were controlled by using the dynamic end-tidal forcing technique. Beat-by-beat values were calculated for the intensity-weighted mean velocity (VIWM), signal power (P), and their instantaneous product (P.VIWM). A simple model consisting of a dela...
Changes in the partial pressure of arterial CO₂ (PaCO₂) regulates cerebrovascular tone and dynamic c...
AIM: Inter-individual variations in normal human cerebral blood flow (CBF) at rest condition have be...
Little is known of the temporal cerebral blood flow response to a chemical stimulus consisting of in...
This study examined the dynamics of the middle cerebral artery (MCA) blood flow response to hypocapn...
This study examined the dynamics of the cerebral blood flow response to hypoxia and hypercapnia in h...
Breath-by-breath variability of the end-tidal partial pressure of CO2 (PetCO2) has been shown to be ...
Although it is known that the vasculatures of the brain and the forearm are sensitive to changes in ...
In humans, cerebrovascular responses to alterations in arterial PCO(2) and PO(2) are well documented...
<div><p>Background</p><p>The middle cerebral artery supplies long end-artery branches to perfuse the...
BACKGROUND AND PURPOSE: This study examined changes in cross-sectional area of the middle cerebral a...
The purpose of this study was to quantify the possible reduction in ventilation that could be attrib...
We studied the response of cerebral blood flow to acute step decreases in arterial blood pressure no...
Blood velocities have been measured transcranially, at small Doppler angles, in the middle cerebral ...
In the evaluation of cerebrovascular CO2 reactivity measurements, it is often assumed that the diame...
Background: The middle cerebral artery supplies long end-artery branches to perfuse the deep white m...
Changes in the partial pressure of arterial CO₂ (PaCO₂) regulates cerebrovascular tone and dynamic c...
AIM: Inter-individual variations in normal human cerebral blood flow (CBF) at rest condition have be...
Little is known of the temporal cerebral blood flow response to a chemical stimulus consisting of in...
This study examined the dynamics of the middle cerebral artery (MCA) blood flow response to hypocapn...
This study examined the dynamics of the cerebral blood flow response to hypoxia and hypercapnia in h...
Breath-by-breath variability of the end-tidal partial pressure of CO2 (PetCO2) has been shown to be ...
Although it is known that the vasculatures of the brain and the forearm are sensitive to changes in ...
In humans, cerebrovascular responses to alterations in arterial PCO(2) and PO(2) are well documented...
<div><p>Background</p><p>The middle cerebral artery supplies long end-artery branches to perfuse the...
BACKGROUND AND PURPOSE: This study examined changes in cross-sectional area of the middle cerebral a...
The purpose of this study was to quantify the possible reduction in ventilation that could be attrib...
We studied the response of cerebral blood flow to acute step decreases in arterial blood pressure no...
Blood velocities have been measured transcranially, at small Doppler angles, in the middle cerebral ...
In the evaluation of cerebrovascular CO2 reactivity measurements, it is often assumed that the diame...
Background: The middle cerebral artery supplies long end-artery branches to perfuse the deep white m...
Changes in the partial pressure of arterial CO₂ (PaCO₂) regulates cerebrovascular tone and dynamic c...
AIM: Inter-individual variations in normal human cerebral blood flow (CBF) at rest condition have be...
Little is known of the temporal cerebral blood flow response to a chemical stimulus consisting of in...