Background and Purpose Doppler ultrasound detection of emboli signals may assist in distinguishing erabolic from thrombotic stroke. Selected patient groups have a high incidence of such signals. We have examined consecutive stroke cases to identify the incidence of Doppler emboli in different etiologic subtypes of stroke. Methods Forty-five patients presenting with first-ever acute carotid terr...

Background and Purpose Doppler ultrasound detection of emboli signals may assist in distinguishing erabolic from thrombotic stroke. Selected patient groups have a high incidence of such signals. We have examined consecutive stroke cases to identify the incidence of Doppler emboli in different etiologic subtypes of stroke. Methods Forty-five patients presenting with first-ever acute carotid terr...

INTRODUCTION End-stage renal disease has been associated with premature atherosclerosis of the cerebral circulation. The risk of stroke, a frequent complication of uremia as a result of cerebral blood flow reduction, is high in dialysis patients. This study aimed to assess brain hemodynamics between hemodialysis interval periods by transcranial Doppler ultrasonography. MATERIALS AND METHODS I...

The dynamics of the metabolic mechanism that regulates cerebral blood flow was studied in 10 normal human subjects using a noninvasive transcranial ultrasonic Doppler method. Flow volume in the posterior cerebral artery, supplying the visual cortex, increased 20.2% in response to light stimulation of the retina, while flow velocity in the same artery increased 16.4%. The regulation of blood flo...

References 1. Newell DW, Aaslid R, Lam A, Mayberg T, Winn HR. Flow and velocity during autoregulation testing in humans. Stroke. 1994; 25:270. Abstract. 2. Miiller HR, Casty M, Moll R, Zehnder R. Response of middle cerebral artery volume flow. Cerebrovasc Dis. 1991;l:82-89. 3. Muller HR, Casty M, Loeb J, Haefele M, Boccalini P. Transcranial Doppler sonography under lower body negative pressure ...

The report on “bleeding and fetal Doppler parameter” is very interesting (1). Iskender et al. reported that “bleeding during genetic amniocentesis did not change umbilical artery and middle cerebral artery Doppler parameters (1).” The finding might not applicable to all cases. In cases with pathology, an aberration might be possible. For example, in the case with intrauterine growth restriction...

BACKGROUND AND PURPOSE The use of Doppler ultrasound to detect arterial emboli has major implications for the classification and treatment of stroke. Experimental studies indicate that embolic materials produce different ultrasound signals, depending on their acoustic properties. To examine the possibility of characterizing emboli of different sources in the clinical setting, we compared the em...

Functional transcrannial Doppler (fTCD) is used for monitoring the hemodynamics characteristics of major cerebral arteries. Its resting-state characteristics are known only when considering the maximal velocity corresponding to the highest Doppler shift (so called the envelope signals). Significantly more information about the resting-state fTCD can be gained when considering the raw cerebral b...

References 1. Newell DW, Aaslid R, Lam A, Mayberg T, Winn HR. Flow and velocity during autoregulation testing in humans. Stroke. 1994; 25:270. Abstract. 2. Miiller HR, Casty M, Moll R, Zehnder R. Response of middle cerebral artery volume flow. Cerebrovasc Dis. 1991;l:82-89. 3. Muller HR, Casty M, Loeb J, Haefele M, Boccalini P. Transcranial Doppler sonography under lower body negative pressure ...

We used a combination of transcranial Doppler ultrasonography and single-photon emission computed tomography to noninvasively assess changes in the diameter of the middle cerebral artery induced by sublingual nitroglycerin in 10 healthy subjects. Nitroglycerin reduced mean blood flow velocities without concurrently changing regional cerebral blood flow in the perfusion territory of this vessel....