The study explored interactions between systemic hemodynamics and cerebral blood flow during attentional processing. Using transcranial Doppler sonography, blood flow velocities in the middle cerebral arteries (MCA) of both hemispheres were recorded while 50 subjects performed a cued reaction time task. Finger arterial pressure and heart rate were also continuously monitored. Doppler sonography...

BACKGROUND AND PURPOSE We sought to evaluate the diagnostic value of echo-enhanced transcranial color-coded duplex sonography (TCCD) and the clinical relevance of vascular pathology assessed by sonography for early clinical outcome in acute ischemic stroke. METHODS We present 23 consecutive patients with an anterior circulation stroke in whom clinical examination, CT, and ultrasonography were...

BACKGROUND AND PURPOSE The transcranial color duplex sonography technique was applied to the vertebrobasilar-posterior system to provide normal data for clinical application. METHODS The intracranial posterior circulation was studied in 49 healthy volunteers (mean +/- SD age, 35 +/- 12 years) by a transcranial and suboccipital approach with a 2.0-MHz sector transducer of a computed sonography...

The blood flow velocities in the basal cerebral arteries can be recorded at any age by transcranial Doppler sonography. We examined nine children with either initial or developing clinical signs of brain death. Soon after successful resuscitation increased diastolic flow velocities indicated a probable decrease in cerebrovascular resistance; this was of no particular prognostic importance. As s...

BACKGROUND AND PURPOSE The wide application of embolization in the treatment of aneurysms has created the need for an intraprocedural means to anticipate a poor outcome by monitoring hemodynamic changes in the brain. METHODS Transcranial Doppler sonography was used to monitor flow velocity in the middle cerebral artery (MCA) in 23 patients undergoing embolization with Guglielmi detachable coi...

BACKGROUND AND PURPOSE During the past decade, transcranial Doppler sonography has widely been used to assess blood flow velocities in the basal intracranial arteries and cerebrovascular reactivity (CR) to various stimuli. Although numerous studies have shown a decline of cerebral blood flow velocity with age, the age dependency of CR, including cerebrovascular CO2 reactivity, however, is contr...

A 72-year-old male presented to the emergency department with gait instability and unclear speech. Computed tomography of the brain showed old lacunar infarcts in basal ganglia. Transcranial Doppler (TCD) sonography was normal. Extracranial Duplex sonography showed indirect hemodynamic signs of bilateral subclavian artery stenosis and both vertebral arteries also showed delayed systolic flow in...

BACKGROUND Cerebrovascular diseases are among the most frequent diseases of the central nervous system. There are several diagnostic methods for cerebral blood vessels evaluation. The optimal test is characterized with low risk, availability and diagnostic certainty. Lately, the rapid development of transcranial color duplex sonography (TCCS) and magnetic resonance angiography (MRA) have shown ...

Abstract In order to prevent stroke, screening for disease‐related intracranial vasculopathy using Doppler ultrasound is recommended in sickle‐cell disease (SCD) children. How screen such adults remains largely unknown. The objective of this study was assess whether transcranial color‐coded duplex sonography (TCCD) sensitive and specific enough identify SCD adult patients with vasculopathy, com...

BACKGROUND AND PURPOSE We conducted this prospective study to evaluate the time course of hemorrhagic transformation (HT) and arterial recanalization in the early phase of ischemic stroke using transcranial sonography (TCS). METHODS Fifty-five patients with acute ischemic hemispheric stroke <32 hours after symptom onset were studied. A 2-MHz sector probe was used to evaluate brain tissue by T...