title: [Cerebral circulation in patients with dilated cardiomyopathy and aortic valve diseases].
abstract: The present study was performed in order to investigate the effect of dilated cardiomyopathy and severe aortic valve disease on cerebral blood flow. Cerebral perfusion was determined in 39 healthy volunteers representing two control groups of different age (77.7 +/- 8.7; 79.7 +/- 8.1 ml/100 g/min), in 7 patients with dilated cardiomyopathy (64.0 +/- 4.7 ml/100 g/min), in 11 patients with severe aortic stenosis (71.1 +/- 14.8 ml/100 g/min), and in 6 patients with severe aortic regurgitation (54.6 +/- 5.8 ml/100 g/min). Regional cerebral blood flow was measured with the 133Xenon inhalation method. Cerebral blood flow in severe aortic regurgitation patients (p = 0.006) was markedly and significantly reduced versus controls, whereas in dilated cardiomyopathy patients (p = 0.197) and in patients with severe aortic stenosis (p = 0.111) cerebral blood flow was not significantly reduced. A chronic adaptation of cerebral blood flow to the profound reduction of cardiac output is assumed in dilated cardiomyopathy patients. The collapsing pulse and the maximal reduction of mean arterial blood pressure in severe aortic regurgitation patients cause the reduction of autoregulatory capacity of cerebral blood flow with subsequent decrease of brain perfusion. Measurement of cerebral blood flow appears to be suitable for evaluation of perfusion deficits due to cardiac abnormalities. It provides an additional parameter for estimating the indication of valve replacement in patients with aortic valve disease.
authors: Medizinische Universitätsklinik Bonn.
authors: A
authors: A
authors: Hagendorff
authors: C
authors: C
authors: Dettmers
authors: P
authors: P
authors: Wirtz
authors: L
authors: L
authors: Pizzulli
authors: A
authors: A
authors: Block
authors: H
authors: H
authors: Omran
authors: W
authors: W
authors: Fehske
authors: A
authors: A
authors: Hartmann
authors: B
authors: B
authors: Lüderitz
mesh_terms: D000328:Adult; D000368:Aged; D001022:Aortic Valve Insufficiency / Q000000981:diagnostic imaging* / Q000503:physiopathology; D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging* / Q000503:physiopathology; D001783:Blood Flow Velocity / Q000502:physiology; D001921:Brain / Q000098:blood supply*; D002545:Brain Ischemia / Q000000981:diagnostic imaging / Q000503:physiopathology; D002311:Cardiomyopathy, Dilated / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D002534:Hypoxia, Brain / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D012016:Reference Values; D014980:Xenon Radioisotopes
chemical_list: D014980:Xenon Radioisotopes
vernacular_title: Die zerebrale Durchblutung bei Patienten mit dilativer Kardiomyopathie sowie bei Aortenklappenfehlern.