Cerebral blood flow and cerebral oxygen consumption in patients with COPD on mechanical ventilation

1992 ◽  
Vol 18 (8) ◽  
pp. 455-458 ◽  
Author(s):  
A. Sari ◽  
S. Oshiata ◽  
T. Toriumi ◽  
S. Yamashita ◽  
S. Kojima ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Oxygen Consumption ◽  
Cerebral Oxygen ◽  
Cerebral Oxygen Consumption

Influence of endogenous norepinephrine on cerebral blood flow and metabolism

1976 ◽  
Vol 231 (2) ◽  
pp. 489-494 ◽  
Author(s):  
ET MacKenzie ◽  
J McCulloch ◽  
AM Harper
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Oxygen Consumption ◽  
Glucose Uptake ◽  
Cerebral Circulation ◽  
Brain Metabolism ◽  
Cerebral Metabolism ◽  
Cerebral Oxygen ◽  
Brain Norepinephrine ◽  
Cerebral Oxygen Consumption

The influence of brain norepinephrine on cerebral metabolism and blood flow was examined because exogenous norepinephrine, administered in a way that the blood-brain barrier is bypassed, has been shown to effect pronounced changes in the cerebral circulation. Reserpine (40 mug/kg, by intracarotid infusion) was administered in order to release brain norepinephrine in five anesthetized baboons. Reserpine significantly increased cerebral oxygen consumption (23%) and cerebral blood flow (50%). This response lasted for approximately 60 min. In a further five animals, effects of central beta-adrenoreceptor blockade were studied. Pro pranolol (12 mug/kg-min) produced an immediate, significant reduction in both cerebral oxygen consumption (40%) and cerebral glucose uptake (39%). Cerebral blood flow was reduced minimally. However, the responsiveness of the cerebral circulation to induced hypercapnia was severely attenuated from a gradient of 3.22 before, to 1,11 after, administration. These experiments suggest that central norepinephrine can influence the cerebral circulation primarily through noradrenergic effects on brain metabolism.

Cerebral Blood Flow and Cerebral Oxygen Consumption during Nitroprusside-induced Hypotension to Less than 50 mmHg

1989 ◽  
Vol 70 (2) ◽  
pp. 255-260 ◽  
Author(s):  
Michel Pinaud ◽  
Réml Souron ◽  
Jean-Noël Lelausque ◽  
Marie-France Gazeau ◽  
Youenn Lajat ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Oxygen Consumption ◽  
Cerebral Oxygen ◽  
Induced Hypotension ◽  
Cerebral Oxygen Consumption

scholarly journals Effects of Indomethacin on Cerebral Blood Flow and Oxygen Consumption in Barbiturate-Anesthetized Normocapnic and Hypercapnic Rats

1981 ◽  
Vol 1 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Nils Dahlgren ◽  
Bo K. Siesjö
Keyword(s):  
Blood Flow ◽  
Nitrous Oxide ◽  
Cerebral Blood Flow ◽  
Oxygen Consumption ◽  
Fatty Acid ◽  
Cerebral Oxygen ◽  
Similar Technique ◽  
Cerebral Oxygen Consumption

Although results obtained in baboons and rats have demonstrated that the fatty acid cyclo-oxygenase inhibitor indomethacin reduces cerebral blood flow (CBF) under control conditions and markedly attenuates the CBF response to hypercapnia, nonconfirmatory results have been obtained in rabbits and cats. Since these latter studies were carried out under barbiturate anesthesia, we tested the effect of indomethacin (10 mg kg−1) on CBF and cerebral oxygen consumption in rats anesthetized with 150 mg kg−1 of phenobarbital. At normocapnia the barbiturate reduced CBF, measured with a 133Xe modification of the Kety-Schmidt technique, to about 50% of nitrous oxide control values as previously determined with a similar technique. At this CBF level, indomethacin induced a small, albeit highly significant decrease in CBF. We suggest that a reduction of this magnitude will escape detection with some CBF techniques in current use. Indomethacin induced a highly significant decrease in CBF during hypercapnia, demonstrating that the barbiturate does not eliminate the effect of indomethacin on CO2 responsiveness. The magnitude of the reduction in CO2 response was so large that it should be detected with most methods for measuring CBF. A comparison with previous data on animals under 70% N2O demonstrated that phenobarbital reduced the CO2 responsiveness, defined as the ratio ΔCBF/ΔPco2, to 39% of that observed under nitrous oxide analgesia. With both types of anesthesia, indomethacin curtailed the CO2 responsiveness 4- to 5-fold.

scholarly journals Effects of a Dopaminergic Agonist (Piribedil) on Cerebral Blood Flow in Man

1982 ◽  
Vol 2 (2) ◽  
pp. 255-257 ◽  
Author(s):  
A. Güell ◽  
G. Géraud ◽  
Ph. Jauzac ◽  
G. Victor ◽  
M. C. Arné-Bès
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Oxygen Consumption ◽  
The Other ◽  
Cerebral Oxygen ◽  
Dopaminergic Agonist ◽  
Human Volunteers ◽  
Cerebral Oxygen Consumption ◽  
Normal Human ◽  
Dose Dependent

In baboons, the intravenous administration of piribedil, a dopaminergic agonist, was associated with marked dose dependent increases in CBF and cerebral oxygen consumption. We have studied the effects of piribedil on CBF in 20 normal, human volunteers of comparable ages. Ten received 0.1 mg/kg piribedil intravenously for 30 min; the other ten received 0.2 mg/kg. In the first group, CBF did not vary significantly, in the second group, there was a mean increase in CBF of 21.8% (p ≤ 0.005). In man, as in animals, piribedil provokes an increase of CBF.

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