hypercapnia/acidente vascular cerebral

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Overnight changes in the cerebral vascular response to isocapnic hypoxia and hypercapnia in healthy humans: protection against stroke.

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OBJECTIVE The reduction in hypercapnic cerebral vascular reactivity that occurs in the morning after sleep is associated with an increased risk of cerebral ischemia and stroke. It is not known if the cerebral vascular response to hypoxia is similarly reduced in the morning, but such a reduction

Altered cerebral inhibition of respiratory and cardiac responses to hypercapnia in acute stroke.

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Ventilatory and heart-rate responses to hypercapnia were evaluated by a CO2 rebreathing technique in 56 patients with acute ischemic stroke and 14 normal controls. Both ventilatory and heart-rate responses were increased in patients with hemispheral lesions, but not in patients with brainstem

Stress of the Endoplasmic Reticulum of Neurons in Stroke Can Be Maximally Limited by Combined Exposure to Hypercapnia and Hypoxia.

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We studied the expression of chaperone GRP-78 and transcription factor NF-kB during the development of ischemic tolerance of the brain after combined and isolated exposure to hypoxia and hypercapnia. Combined exposure to hypoxia and hypercapnia maximally increased the expression of chaperone GRP-78

The cerebral vascular response to hypercapnia in stroke.

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Regional cerebral blood flow response to hypercapnia in stroke.

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Exceptional CO₂ tolerance in white sturgeon (Acipenser transmontanus) is associated with protection of maximum cardiac performance during hypercapnia in situ.

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White sturgeon rank among the most CO₂-tolerant fish species examined to date. We investigated whether this exceptional CO₂ tolerance extended to the heart, an organ generally viewed as acidosis intolerant. Maximum cardiac output (Q(max)) and maximum cardiac power output (PO(max)) were assessed

Blood flow reactivity to hypercapnia in strictly unilateral carotid disease: preliminary results.

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To show relationship between degree of carotid arterial stenosis and cerebral blood flow reactivity (RES%) to induced hypercapnia, fluorine-18-fluoromethane and positron emission tomography (PET) was used to study 18 patients with carotid distribution transient ischaemic attacks (TIA), all free of

The hemodynamic effect of profound hypercapnia on acute hypoxic respiratory failure.

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The effect of profound hypercapnia on acute hypoxic respiratory failure is evaluated. Eight dogs were subjected to oleic acid-induced acute respiratory failure. Four dogs were ventilated normally, and four dogs were made hypercapneic by rebreathing exhaled CO2. In the hypercapneic animals, heart

Altered cerebral vasoregulation predicts the outcome of patients with partial anterior circulation stroke.

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OBJECTIVE The aim of this study was to investigate the correlation between cerebral hemodynamic changes and the evolution of neurological deficit after stroke. METHODS We included 65 patients with non-lacunar stroke admitted to a rehabilitation hospital within 4 weeks from the event. An evaluation

Altered cerebral vasoregulation in hypertension and stroke.

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BACKGROUND Autoregulation of blood flow that maintains steady perfusion over the range of systemic blood pressure is compromised by stroke. OBJECTIVE To determine whether cerebral vasoregulation is impaired in stroke during orthostatic stress. METHODS Subjects included 30 control subjects, 30 with

Reduced microvascular volume and hemispherically deficient vasoreactivity to hypercapnia in acute ischemia: MRI study using permanent middle cerebral artery occlusion rat model.

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Vasoreactivity to hypercapnia has been used for assessing cerebrovascular tone and control altered by ischemic stroke. Despite the high prognostic potential, traits of hypercapnia-induced hemodynamic changes have not been fully characterized in relation with baseline vascular states and brain tissue

Cerebral vasoreactivity in hypocapnia and hypercapnia in patients with diabetes mellitus type 2 with or without arterial hypertension.

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OBJECTIVE Diabetes mellitus (DM) is an in-dependent risk factor for cardiovascular diseases. The origin of diabetic microangiopathy is multifactorial; it affects all layers of the artery wall, causing endothelial and vasoreactivity impairment. The incidence of cerebral vasoreactivity failure in

Nitric oxide improves transpulmonary vascular mechanics but does not change intrinsic right ventricular contractility in an acute respiratory distress syndrome model with permissive hypercapnia.

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OBJECTIVE To test the hypothesis that in a swine model of acute respiratory distress syndrome (ARDS) with permissive hypercapnia, inhaled nitric oxide would improve transpulmonary vascular mechanics and right ventricular workload while not changing intrinsic right ventricular

Proliferative and Synthetic Activity of Nerve Cells after Combined or Individual Exposure to Hypoxia and Hypercapnia.

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We compared synthetic and proliferative activity of brain cells in rats exposed hypoxia, hypercapnia, or both prior to experimental focal stroke. The mean number of nucleolus organizer regions in penumbra neurons did not change after normobaric hypoxia, but increased after permissive hypercapnia or

Peripheral chemoreceptor contributions to sympathetic and cardiovascular responses during hypercapnia.

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We tested the hypothesis that integrated sympathetic and cardiovascular reflexes are modulated by systemic CO2 differently in hypoxia than in hyperoxia (n = 7). Subjects performed a CO2 rebreathe protocol that equilibrates CO2 partial pressures between arterial and venous blood and that elevates end

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