Marty Rossman

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Before surgery, we evaluated major intracranial collateral pathways using transcranial Doppler ultrasonography (TCD) in 50 patients who then underwent carotid endarterectomy with concurrent multimodality cerebral monitoring. Patients were grouped with respect to collateral pathways demonstrated preoperatively by TCD: Group 1, good collateralization with an(More)
Neurologic deficits that occur simultaneously with or subsequent to internal carotid artery occlusion may be influenced by the adequacy of the intracerebral collateral circulation. Transcranial Doppler ultrasonography was used to evaluate mean middle cerebral artery blood velocity and blood flow in major collateral arteries in 78 patients, including 39(More)
Transcranial Doppler (TCD) insonation permits quantitative noninvasive evaluation of intracerebral arterial velocity. With the use of a 2 MHz Doppler through a transtemporal approach, middle cerebral artery blood velocity (MCA-V, centimeters per second) and major collaterals were measured in 96 patients, including 15 normal control subjects, 66 patients(More)
Acute mountain sickness (AMS) is a prevalent illness seen in humans exposed to high altitudes. An increase in cerebral blood flow as a result of cerebrovasodilatation is felt by many to be responsible for its occurrence. Using the recently developed transcranial Doppler (TCD), it has become possible to detect and quantify flow velocity in the large cerebral(More)
We assessed the potential of 2-MHz pulsed-wave transorbital Doppler ultrasonography to delineate the role of the ophthalmic artery as a source of collateral cerebral blood supply by comparing oculopneumoplethysmography, transorbital Doppler ultrasonography, periorbital continuous-wave Doppler ultrasonography, and transcranial Doppler ultrasonography in 25(More)
The diagnosis of vertebrobasilar insufficiency (VBI) is a clinical challenge because its manifestations are subjective and difficult to quantify. We evaluate 61 patients with the clinical diagnosis of VBI and 30 control patients with other medical problems. We used duplex scanning to study the extracranial carotid, vertebral, and subclavian arteries, and a(More)
Transcranial Doppler (TCD) evaluation is dependent on the accurate identification of intracranial vessels. Manual extracranial vertebral artery compression was used to modulate blood flow in vessels of the vertebrobasilar system in 118 patients examined by TCD. Two examples of its utility are presented in detail. Complete examination by TCD should include(More)