Albumin therapy of transient focal cerebral ischemia

In vivo analysis of dynamic microvascular responses

Ludmila Belayev, Elisabeth Pinard, Helene Nallet, Jacques Seylaz, Yitao Liu, Panomkhawn Riyamongkol, Weizhao Zhao, Raul Busto, Myron Ginsberg

Research output: Contribution to journalArticle

110 Citations (Scopus)

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 languageEnglish
Pages (from-to)1077-1084
Number of pages8
JournalStroke
Volume33
Issue number4
DOIs
StatePublished - Apr 20 2002

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Transient Ischemic Attack
Albumins
Middle Cerebral Artery Infarction
Perfusion
Perfusion Imaging
Venules
Confocal Microscopy
Lasers
Erythrocytes
Therapeutics
Sprague Dawley Rats
Erythrocyte Indices
Nitrous Oxide
Neuroprotective Agents
Halothane
Brain Ischemia
Sutures
Reperfusion
Blood Vessels
Dilatation

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 journalArticle

Belayev, L, Pinard, E, Nallet, H, Seylaz, J, Liu, Y, Riyamongkol, P, Zhao, W, Busto, R & Ginsberg, M 2002, 'Albumin therapy of transient focal cerebral ischemia: In vivo analysis of dynamic microvascular responses', Stroke, vol. 33, no. 4, pp. 1077-1084. https://doi.org/10.1161/hs0402.105555
Belayev L, Pinard E, Nallet H, Seylaz J, Liu Y, Riyamongkol P et al. Albumin therapy of transient focal cerebral ischemia: In vivo analysis of dynamic microvascular responses. Stroke. 2002 Apr 20;33(4):1077-1084. https://doi.org/10.1161/hs0402.105555
Belayev, Ludmila ; Pinard, Elisabeth ; Nallet, Helene ; Seylaz, Jacques ; Liu, Yitao ; Riyamongkol, Panomkhawn ; Zhao, Weizhao ; Busto, Raul ; Ginsberg, Myron. / Albumin therapy of transient focal cerebral ischemia : In vivo analysis of dynamic microvascular responses. In: Stroke. 2002 ; Vol. 33, No. 4. pp. 1077-1084.
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AU - Seylaz, Jacques

AU - Liu, Yitao

AU - Riyamongkol, Panomkhawn

AU - Zhao, Weizhao

AU - Busto, Raul

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