Background and Purpose: Transcranial Doppler blood flow velocities are inversely related to age and hematocrit, but the relative importance of age, oxygenation, and hemorheological factors has not previously been examined. We evaluated the relative contributions of these factors to middle cerebral artery blood flow velocity in adults with chronic renal failure, a population subject to significa...

A 54-year-old woman presented to the emergency department with sudden onset severe headache, nausea and vomiting upon waking that morning. On examination, she was alert and oriented, with a mild right facial droop and a right upper extremity pronator drift. A non-contrast computed tomography (CT) of the head revealed diffuse subarachnoid blood, with a prominent triangular focus projecting into ...

BACKGROUND AND PURPOSE The purpose of this study was to assess the ability of transcranial Doppler ultrasonography to detect selective circulatory changes during cognitive activity. METHODS We measured cerebral artery flow velocity in 21 normal volunteers by transcranial Doppler ultrasonography during rest followed by cerebral activation. Mean and peak systolic flow velocities of the anterior...

BACKGROUND One of the main methods for evaluation of fetal well-being is analysis of Doppler flow velocity waveform of fetal vessels. Evaluation of Doppler wave of the middle cerebral artery can predict most of the at-risk fetuses in high-risk pregnancies. In this study, we tried to determine the normal ranges and their trends during pregnancy of Doppler flow velocity indices (resistive index, ...

Content/Summary Low pulsatile or non-pulsatile cerebral perfusion was noted in patients with aortic arch dissection, acute proximal internal carotid or common carotid artery occlusion and means impending large cerebral infarction. A 45-year-old man had a sudden aphasia and left hemispheric symptoms with NIHSS of 16 on arrival. Complete occlusion of left middle artery with leptomeningeal collate...

The authors report the case of a patient whose left middle cerebral artery aneurysm was wrapped with cotton. Occlusion of the middle cerebral artery, probably secondary to a foreign-body inflammatory reaction, developed late in the postoperative course. A computerized tomography scan revealed cerebral infarct, and an enhancing expansive lesion at the site of the aneurysm suggesting the formatio...

We report a case of a 5-year-old girl who developed left hemiparesis and left facial palsy, 6 days after the initiation of fever and respiratory symptoms due to pneumonia. Chest radiography, conducted upon admission, showed pneumonic infiltration and pleural effusion in the left lung field. Brain magnetic resonance imaging showed acute ischemic infarction in the right middle cerebral artery ter...