BACKGROUND: We applied magnetic resonance imaging to analyze the degree of local diffusion and perfusion abnormalities and the status of reperfusion in regions with subsequent hemorrhagic transformation (HT). METHODS: 51 patients with acute ischemic stroke were studied by diffusion- and perfusion-weighted imaging within 3.0 +/- 0.8 h, on day 1 and days 5-8. After realignment of the image data sets, the parameter maps of the apparent diffusion coefficient (ADC), cerebral blood flow (CBF) and cerebral blood volume (CBV), and mean transit time were analyzed in the area of subsequent HT. The degree of local diffusion and perfusion impairment in the HT area was compared with the entire diffusion and perfusion abnormality. Reperfusion status was separately assessed for the entire perfusion abnormality and the HT area. RESULTS: HT was observed in 19/51 patients (37.2%) within 8 days after symptom onset. Areas destined for HT revealed a more severe decrease in ADC (to 70 +/- 13%; p < 0.01), CBV (to 31 +/- 26%; p < 0.001) and CBF (to 28 +/- 19%; p < 0.001) compared to the entire perfusion abnormality. Local reperfusion in the HT area was seen in 18/19 patients. The presence of HT did not coincide with a worse clinical outcome. DISCUSSION: HT is the result of reperfusion in the region with the most severe local perfusion impairment and does not influence the neurological outcome. Copyright (c) 2005 S. Karger AG, Basel.
BACKGROUND: We applied magnetic resonance imaging to analyze the degree of local diffusion and perfusion abnormalities and the status of reperfusion in regions with subsequent hemorrhagic transformation (HT). METHODS: 51 patients with acute ischemic stroke were studied by diffusion- and perfusion-weighted imaging within 3.0 +/- 0.8 h, on day 1 and days 5-8. After realignment of the image data sets, the parameter maps of the apparent diffusion coefficient (ADC), cerebral blood flow (CBF) and cerebral blood volume (CBV), and mean transit time were analyzed in the area of subsequent HT. The degree of local diffusion and perfusion impairment in the HT area was compared with the entire diffusion and perfusion abnormality. Reperfusion status was separately assessed for the entire perfusion abnormality and the HT area. RESULTS: HT was observed in 19/51 patients (37.2%) within 8 days after symptom onset. Areas destined for HT revealed a more severe decrease in ADC (to 70 +/- 13%; p < 0.01), CBV (to 31 +/- 26%; p < 0.001) and CBF (to 28 +/- 19%; p < 0.001) compared to the entire perfusion abnormality. Local reperfusion in the HT area was seen in 18/19 patients. The presence of HT did not coincide with a worse clinical outcome. DISCUSSION: HT is the result of reperfusion in the region with the most severe local perfusion impairment and does not influence the neurological outcome. Copyright (c) 2005 S. Karger AG, Basel.
Authors: Leticia C S Souza; Seyedmehdi Payabvash; Yifei Wang; Shervin Kamalian; Pamela Schaefer; R Gilberto Gonzalez; Karen L Furie; Michael H Lev Journal: Cerebrovasc Dis Date: 2011-11-30 Impact factor: 2.762
Authors: A D Horsch; J W Dankbaar; J M Niesten; T van Seeters; I C van der Schaaf; Y van der Graaf; W P Th M Mali; B K Velthuis Journal: AJNR Am J Neuroradiol Date: 2015-04-23 Impact factor: 3.825
Authors: Fabien Scalzo; Jeffry R Alger; Xiao Hu; Jeffrey L Saver; Krishna A Dani; Keith W Muir; Andrew M Demchuk; Shelagh B Coutts; Marie Luby; Steven Warach; David S Liebeskind Journal: Magn Reson Imaging Date: 2013-04-13 Impact factor: 2.546
Authors: Bruce C V Campbell; Søren Christensen; Mark W Parsons; Leonid Churilov; Patricia M Desmond; P Alan Barber; Kenneth S Butcher; Christopher R Levi; Deidre A De Silva; Maarten G Lansberg; Michael Mlynash; Jean-Marc Olivot; Matus Straka; Roland Bammer; Gregory W Albers; Geoffrey A Donnan; Stephen M Davis Journal: Ann Neurol Date: 2013-02-26 Impact factor: 10.422