Abstract
Background and Purpose - To study whether intravascular or hemodynamic factors contribute to the marked neuroprotective effect of albumin therapy in focal cerebral ischemia, 2 complementary methods were applied: laser-scanning confocal microscopy (LSCM) and laser-Doppler perfusion imaging (LDPI). Methods - In the LSCM study, Sprague-Dawley rats were anesthetized with halothane/nitrous oxide, and a cranial window was placed over the dorsolateral frontoparietal cortex. Rats received 2-hour middle cerebral artery occlusion (MCAO) by an intraluminal suture and were treated with human albumin (1.25 g/kg; n=4) or saline (n=3) after 30 minutes of recirculation. Video images of cortical vessels were continually acquired and were digitized offline to measure diameters and fluorescent erythrocyte velocities. In the LDPI study, cortical perfusion was measured in anesthetized Sprague-Dawley rats that received 2-hour MCAO and were treated with albumin (2.5 g/kg; n=6) or saline (n=5) at 30 minutes after recirculation. Results - In the LSCM study, MCAO was associated with arteriolar dilation and slowing of capillary and venular erythrocyte perfusion. During the first 15 to 30 minutes of postischemic recirculation, prominent foci of vascular stagnation developed within cortical venules, associated with thrombuslike foci and adherent corpuscular structures consistent in size with neutrophils. Saline administration failed to affect these phenomena, while albumin therapy was followed by significant increases in arteriolar diameter (≈12%; P=0.007) and by a prompt improvement of venular and capillary erythrocyte perfusion and a partial disappearance of adherent thrombotic material. Albumin therapy increased erythrocyte flow velocity in both capillaries (288±73% versus 76±18% in the saline group; P=0.023) and venules (2.7-fold [P=0.001] versus 1.0-fold in the saline group [P=NS]). In the LDPI study, cortical perfusion declined during MCAO and rose initially with recirculation (to ≈135% of baseline) in both groups. Mean cortical perfusion improved slightly (≈14%; P=NS) in albumin-treated animals. Conclusions - These results reveal a beneficial effect of albumin therapy in reversing stagnation, thrombosis, and corpuscular adherence within cortical venules in the reperfusion phase after focal ischemia and support its utility in the treatment of acute ischemic stroke.
| Original language | English |
|---|---|
| Pages (from-to) | 1077-1084 |
| Number of pages | 8 |
| Journal | Stroke |
| Volume | 33 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 20 2002 |
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Keywords
- Albumin
- Middle cerebral artery occlusion
- Neuroprotection
- Perfusion
- Rats
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
- Neuroscience(all)
Cite this
Albumin therapy of transient focal cerebral ischemia : In vivo analysis of dynamic microvascular responses. / Belayev, Ludmila; Pinard, Elisabeth; Nallet, Helene; Seylaz, Jacques; Liu, Yitao; Riyamongkol, Panomkhawn; Zhao, Weizhao; Busto, Raul; Ginsberg, Myron.
In: Stroke, Vol. 33, No. 4, 20.04.2002, p. 1077-1084.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Albumin therapy of transient focal cerebral ischemia
T2 - In vivo analysis of dynamic microvascular responses
AU - Belayev, Ludmila
AU - Pinard, Elisabeth
AU - Nallet, Helene
AU - Seylaz, Jacques
AU - Liu, Yitao
AU - Riyamongkol, Panomkhawn
AU - Zhao, Weizhao
AU - Busto, Raul
AU - Ginsberg, Myron
PY - 2002/4/20
Y1 - 2002/4/20
N2 - Background and Purpose - To study whether intravascular or hemodynamic factors contribute to the marked neuroprotective effect of albumin therapy in focal cerebral ischemia, 2 complementary methods were applied: laser-scanning confocal microscopy (LSCM) and laser-Doppler perfusion imaging (LDPI). Methods - In the LSCM study, Sprague-Dawley rats were anesthetized with halothane/nitrous oxide, and a cranial window was placed over the dorsolateral frontoparietal cortex. Rats received 2-hour middle cerebral artery occlusion (MCAO) by an intraluminal suture and were treated with human albumin (1.25 g/kg; n=4) or saline (n=3) after 30 minutes of recirculation. Video images of cortical vessels were continually acquired and were digitized offline to measure diameters and fluorescent erythrocyte velocities. In the LDPI study, cortical perfusion was measured in anesthetized Sprague-Dawley rats that received 2-hour MCAO and were treated with albumin (2.5 g/kg; n=6) or saline (n=5) at 30 minutes after recirculation. Results - In the LSCM study, MCAO was associated with arteriolar dilation and slowing of capillary and venular erythrocyte perfusion. During the first 15 to 30 minutes of postischemic recirculation, prominent foci of vascular stagnation developed within cortical venules, associated with thrombuslike foci and adherent corpuscular structures consistent in size with neutrophils. Saline administration failed to affect these phenomena, while albumin therapy was followed by significant increases in arteriolar diameter (≈12%; P=0.007) and by a prompt improvement of venular and capillary erythrocyte perfusion and a partial disappearance of adherent thrombotic material. Albumin therapy increased erythrocyte flow velocity in both capillaries (288±73% versus 76±18% in the saline group; P=0.023) and venules (2.7-fold [P=0.001] versus 1.0-fold in the saline group [P=NS]). In the LDPI study, cortical perfusion declined during MCAO and rose initially with recirculation (to ≈135% of baseline) in both groups. Mean cortical perfusion improved slightly (≈14%; P=NS) in albumin-treated animals. Conclusions - These results reveal a beneficial effect of albumin therapy in reversing stagnation, thrombosis, and corpuscular adherence within cortical venules in the reperfusion phase after focal ischemia and support its utility in the treatment of acute ischemic stroke.
AB - Background and Purpose - To study whether intravascular or hemodynamic factors contribute to the marked neuroprotective effect of albumin therapy in focal cerebral ischemia, 2 complementary methods were applied: laser-scanning confocal microscopy (LSCM) and laser-Doppler perfusion imaging (LDPI). Methods - In the LSCM study, Sprague-Dawley rats were anesthetized with halothane/nitrous oxide, and a cranial window was placed over the dorsolateral frontoparietal cortex. Rats received 2-hour middle cerebral artery occlusion (MCAO) by an intraluminal suture and were treated with human albumin (1.25 g/kg; n=4) or saline (n=3) after 30 minutes of recirculation. Video images of cortical vessels were continually acquired and were digitized offline to measure diameters and fluorescent erythrocyte velocities. In the LDPI study, cortical perfusion was measured in anesthetized Sprague-Dawley rats that received 2-hour MCAO and were treated with albumin (2.5 g/kg; n=6) or saline (n=5) at 30 minutes after recirculation. Results - In the LSCM study, MCAO was associated with arteriolar dilation and slowing of capillary and venular erythrocyte perfusion. During the first 15 to 30 minutes of postischemic recirculation, prominent foci of vascular stagnation developed within cortical venules, associated with thrombuslike foci and adherent corpuscular structures consistent in size with neutrophils. Saline administration failed to affect these phenomena, while albumin therapy was followed by significant increases in arteriolar diameter (≈12%; P=0.007) and by a prompt improvement of venular and capillary erythrocyte perfusion and a partial disappearance of adherent thrombotic material. Albumin therapy increased erythrocyte flow velocity in both capillaries (288±73% versus 76±18% in the saline group; P=0.023) and venules (2.7-fold [P=0.001] versus 1.0-fold in the saline group [P=NS]). In the LDPI study, cortical perfusion declined during MCAO and rose initially with recirculation (to ≈135% of baseline) in both groups. Mean cortical perfusion improved slightly (≈14%; P=NS) in albumin-treated animals. Conclusions - These results reveal a beneficial effect of albumin therapy in reversing stagnation, thrombosis, and corpuscular adherence within cortical venules in the reperfusion phase after focal ischemia and support its utility in the treatment of acute ischemic stroke.
KW - Albumin
KW - Middle cerebral artery occlusion
KW - Neuroprotection
KW - Perfusion
KW - Rats
UR - http://www.scopus.com/inward/record.url?scp=0036217242&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036217242&partnerID=8YFLogxK
U2 - 10.1161/hs0402.105555
DO - 10.1161/hs0402.105555
M3 - Article
C2 - 11935064
AN - SCOPUS:0036217242
VL - 33
SP - 1077
EP - 1084
JO - Stroke
JF - Stroke
SN - 0039-2499
IS - 4
ER -