title: The Doppler CO2 test to exclude patients not in need of extracranial/intracranial bypass surgery.
abstract: In patients with an internal carotid artery (ICA) occlusion who suffer from ipsilateral transient ischaemic attacks or minor stroke extra/intracranial (EC/IC) bypass surgery may be useful only where there is insufficient collateral supply. The transcranial Doppler CO2 test offers a simple method of investigating the residual autoregulatory capacity which gives quantitative information about the efficiency of the collaterals. In 155 patients with 162 ICA occlusions there was a significant correlation between a markedly decreased or exhausted autoregulatory capacity and a recent ipsilateral ischaemic event (p less than 0.001). The Doppler CO2 test may enable the exclusion of patients not in need of EC/IC bypass surgery. In the reported series this affected more than 80% of all ICA occlusions.
authors.affiliation: Department of Neurology, University of Ulm, Federal Republic of Germany.
authors.forename: B
authors.initials: B
authors.lastname: Widder
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001783:Blood Flow Velocity; D002545:Brain Ischemia / Q000175:diagnosis / Q000601:surgery*; D002245:Carbon Dioxide; D002340:Carotid Artery Diseases / Q000601:surgery*; D002343:Carotid Artery, Internal / Q000601:surgery; D002548:Cerebral Revascularization; D002560:Cerebrovascular Circulation; D004453:Echoencephalography; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis; D011379:Prognosis
chemical_list: D002245:Carbon Dioxide