background: the goal of this study was to determine the reliability of tcd in evaluation of vertebrobasilar arteries in comparison with brain mra in patients suffering from acute vertebrobasilar stroke. methods: samples were patients with definite clinical diagnosis of vertebrobasilar stroke. for all patients brain mri, mra and tcd were performed during the first 48 hours of admission. basilar ...

Commentary Cerebral vasospasm (CVS) is well known to be clinically significant after subarachnoid hemorrhage and has been thoroughly studied in that setting. There has been limited study of CVS following cranial surgeries for tumors, vascular lesions and epilepsy. The incidence of transcranial Doppler sonography (TCD)-defined CVS after certain cranial surgeries has been documented in several st...

This paper presents a new concept of algorithms for estimation of maximum frequency ( fmax) in the nonstationary Transcranial Doppler (TCD) signal. The improvement of estimator’s properties is achieved by exploiting the knowledge about dynamic properties of the blood flow. The raw estimates of fmax, calculated with a conventional algorithm for short segments of TCD signal, are smoothed and used...

A 52-year-old man was admitted with a brain abscess in the left basal ganglia. He had a paradoxical brain embolic mechanism owing to a pulmonary arteriovenous fistula (PAVF) and was diagnosed as having a right-to-left shunt by transesophageal echocardiography (TEE) and transcranial color Doppler (TCD) with saline contrast medium. We determined that the brain abscess was caused by the PAVFs with...

Background. Vertebrobasilar insufficiency (VBI) is a hemodynamic posterior circulation transient ischemic attack (TIA) caused by intermittent vertebral artery occlusion that is induced by a head rotation or extension. VBI may result from large vessel atherosclerotic disease, dissection, cervical compressive lesions, and subclavian steal phenomenon. Diagnostic transcranial Doppler (TCD) of VBI d...

A 42-year-old woman with history of analgesic overuse and episodic migraine without aura presented thunderclap headache. She then ingested 4.5 g of dipyrone, 0.75 g of isometheptene, 0.45 g of caffeine and subsequently developed right hemiparesis and dysarthria. Brain computed tomography (CT) and digital subtraction angiography (DSA) are shown, respectively, in Figures 1A and 1B. Transcranial d...

TCD (transcranial Doppler) technology has improved considerably in the last decade with a corresponding increase in research interest and clinical applications by neurologists in Asia and the rest of the world. This review was written to assess the current use of TCD in atherosclerotic ischaemic stroke particularly in the areas of diagnosis and prognostication of intracranial cerebral artery di...