Hypocapnia and Cerebral Hypoperfusion in Orthostatic Intolerance
نویسندگان
چکیده
منابع مشابه
Hypocapnia and cerebral hypoperfusion in orthostatic intolerance.
BACKGROUND AND PURPOSE Orthostatic and other stresses trigger tachycardia associated with symptoms of tremulousness, shortness of breath, dizziness, blurred vision, and, often, syncope. It has been suggested that paradoxical cerebral vasoconstriction during head-up tilt might be present in patients with orthostatic intolerance. We chose to study middle cerebral artery (MCA) blood flow velocity ...
متن کاملOrthostatic Cerebral Hypoperfusion Syndrome
OBJECTIVE Orthostatic dizziness without orthostatic hypotension is common but underlying pathophysiology is poorly understood. This study describes orthostatic cerebral hypoperfusion syndrome (OCHOs). OCHOs is defined by (1) abnormal orthostatic drop of cerebral blood flow velocity (CBFv) during the tilt test and (2) absence of orthostatic hypotension, arrhythmia, vascular abnormalities, or oth...
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INTRODUCTION Orthostatic intolerance is characterized by symptoms of lightheadedness, tiredness, palpitations, blurred vision and occasionally, by loss of consciousness during standing, which are relieved upon recumbency. These symptoms are suggestive of cerebral hypoperfusion, yet they occur in the absence of orthostatic hypotension. We therefore evaluated cerebral vasoregulation in patients w...
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CONTEXT Patients with chronic fatigue syndrome and those with orthostatic intolerance share many symptoms, yet questions exist as to whether CFS patients have physiological evidence of orthostatic intolerance. OBJECTIVE To determine if some CFS patients have increased rates of orthostatic hypotension, hypertension, tachycardia, or hypocapnia relative to age-matched controls. DESIGN Assess b...
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BACKGROUND AND PURPOSE Postoperative brain dysfunction, such as delirium, is a common complication of anesthesia and is sometimes prolonged, especially in patients with cerebrovascular disease. In the present study we investigated the effect of hypocapnia during anesthesia on neuronal damage using a rat model of chronic cerebral hypoperfusion. METHODS Chronic cerebral hypoperfusion was induce...
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ژورنال
عنوان ژورنال: Stroke
سال: 1998
ISSN: 0039-2499,1524-4628
DOI: 10.1161/01.str.29.9.1876