Hypothermia is not neuroprotective after infection-sensitized neonatal hypoxic-ischemic brain injury

Resuscitation
Damjan OsredkarHemmen Sabir

Abstract

Therapeutic hypothermia (HT) is the standard treatment after perinatal hypoxic-ischemic (HI) injury. Infection increases vulnerability to HI injury, but the effect of HT on lipopolysaccharide (LPS) sensitized HI brain injury is unknown. P7 rat pups were injected either with vehicle or LPS, and after a 4h delay they were exposed to left carotid ligation followed by global hypoxia inducing a unilateral stroke-like HI injury. Pups were randomized to the following treatments: (1) vehicle treated HI-pups receiving normothermia treatment (NT) (Veh-NT; n=30); (2) LPS treated HI-pups receiving NT treatment (LPS-NT; n=35); (3) vehicle treated HI-pups receiving HT treatment (Veh-HT; n=29); or (4) LPS treated HI-pups receiving HT treatment (LPS-HT; n=46). Relative area loss of the left/right hemisphere and the areas of hippocampi were measured at P14. Mean brain area loss in the Veh-NT group was 11.2±14%. The brain area loss in LPS-NT pups was 29.8±17%, which was significantly higher than in the Veh-NT group (p=0.002). The Veh-HT group had a significantly smaller brain area loss (5.4±6%), when compared to Veh-NT group (p=0.043). The LPS-HT group showed a brain area loss of 32.5±16%, which was significantly higher than in the Veh-HT group ...Continue Reading

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