Xenon and hypothermia combine additively offering long term functional and histopathological neuroprotection after neonatal hypoxia-ischemia

CE Hobbs, M Thoresen, AM Tucker, K Aquilina, EV Chakkarapani, J Dingley

Research output: Contribution to journalArticle (Academic Journal)peer-review

182 Citations (Scopus)

Abstract

Background and Purpose— Hypoxic/ischemic (HI) brain injury affects 1 to 6 per 1000 live human births, with a mortality of 15% to 20%. A quarter of survivors have permanent disabilities. Hypothermia is the only intervention that improves outcome; however, further improvements might be obtained by combining hypothermia with additional treatments. Xenon is a noble anesthetic gas with an excellent safety profile, showing great promise in vitro and in vivo as a neuroprotectant. We investigated combinations of 50% xenon (Xe50%) and hypothermia of 32°C (HT32°C) as a post-HI therapy.

Methods— An established neonatal rat HI model was used. Serial functional neurologic testing into adulthood 10 weeks after injury was performed, followed by global and regional brain histopathology evaluation.

Results— In the combination Xe50%HT32°C group, complete restoration of long-term functional outcomes was seen. Hypothermia produced improvement on short- (P<0.001) and long- (P<0.001) term functional testing, whereas Xe50% alone predominantly improved long-term function (P<0.05), suggesting that short-term testing does not always predict eventual outcome. Similarly, the Xe50%HT32°C combination produced the greatest (71%) improvement in global histopathology scores, a pattern mirrored in the regional scores, whereas Xe50% and HT32°C individually produced smaller improvements (P<0.05 and P<0.001, respectively). The interaction between the 2 treatments was additive.

Conclusions— The xenon/hypothermia combination additively confers greater protection after HI than either treatment alone. The functional improvement is almost complete, is sustained long term, and is accompanied by greatly improved histopathology. The unique safety profile differentiates xenon as an attractive combination therapy with hypothermia to improve the otherwise bleak outcome from neonatal HI.
Translated title of the contributionXenon and hypothermia combine additively offering long term functional and histopathological neuroprotection after neonatal hypoxia-ischemia
Original languageEnglish
Pages (from-to)1307 - 1313
Number of pages7
JournalStroke
Volume39
Early online date28 Feb 2008
DOIs
Publication statusPublished - Apr 2008

Bibliographical note

Publisher: Lippincott, Williams & Wilkins

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