منابع مشابه
Hyperventilation and cerebral blood flow.
Hyperventilation and Cerebral Blood Flow • Hypocapnic-hyperventilation has a profound, but probably temporary, effect on CBF, producing approximately a 2% decline in CBF for each 1 torr decline in Pcov Th' effect appears to be mediated through changes in perivascular pH of the cerebral resistance vessels acting directly on the vessel wall. At low PC0;( the vasoconstrictor effect of short-term h...
متن کاملCerebral hemodynamics at altitude: effects of hyperventilation and acclimatization on cerebral blood flow and oxygenation.
OBJECTIVE Alterations in cerebral blood flow (CBF) and cerebral oxygenation are implicated in altitude-associated diseases. We assessed the dynamic changes in CBF and peripheral and cerebral oxygenation engendered by ascent to altitude with partial acclimatization and hyperventilation using a combination of near-infrared spectroscopy, transcranial Doppler ultrasound, and diffuse correlation spe...
متن کاملHyperventilation and human calf blood flow.
COFFMAN, JAY D., AND PETER ALLY. Hyperventilation and human calf blood $0~. Am. J. Physiol. 21 I (5): 1255-1260. rg66.-Calf blood flow was measured in normal subjects by venous occlusion plethysmography, and capillary blood flow by the disappearance rate of an intramuscular injection of NaI131 before and during hyperventilation at 30 breaths/min for 3 min. Hyperventilation with room air produce...
متن کاملThe effect of hyperventilation upon cerebral blood flow and metabolism in patients with fulminant hepatic failure.
Patients with FHF have a high risk of cerebral edema and intracranial hypertension. The pathophysiological background for this phenomenon is not completely settled, but alteration in CBF as well as cerebral metabolism seems to be of importance. Mechanical hyperventilation has a prompt effect on intracranial pressure. This effect is assumed to be caused by the hypocapnia induced alkalosis which ...
متن کاملEffect of nimodipine on cerebral blood flow and metabolism in rats during hyperventilation.
Nimodipine shws promise in the prevention and treatment of brain ischemia. We examined the interaction of nimodipine pretreatment in a dose sufficient to prevent postischemic hypoperfusion and hyperventilation. We studied four groups of rats: normocarbia plus vehicle (Group 1, n = 5), hypocarbia plus vehicle (Group 2, n = 4), normocarbia plus nimodipine (Group 3, n = 7), and hypocarbia plus nim...
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ژورنال
عنوان ژورنال: Stroke
سال: 1972
ISSN: 0039-2499,1524-4628
DOI: 10.1161/01.str.3.5.566