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Cooling for cerebral protection during brain surgery.

Imelda M Galvin1, Ron Levy, J Gordon Boyd

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Induced hypothermia (cooling) did not significantly reduce mortality or severe neurological disability in neurosurgery patients. This updated review found no clear evidence of benefit or harm from cooling in this patient group.

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Area of Science:

  • Neurosurgery
  • Neuroprotection
  • Therapeutic Hypothermia

Background:

  • Neurosurgery patients face risks of cerebral ischemia, hypoxia, and neuronal death, increasing mortality and long-term disability.
  • Induced hypothermia shows neuroprotective potential, demonstrated in animal studies and cardiac arrest survivors.
  • Previous reviews found no conclusive evidence for or against induced hypothermia's effectiveness or safety in neurosurgery.

Purpose of the Study:

  • To evaluate the effectiveness and safety of induced hypothermia versus normothermia for neuroprotection in patients undergoing brain surgery.
  • To assess impact on short- and long-term mortality and neurological outcomes.
  • To determine the incidence of adverse events such as infection, myocardial infarction, and stroke.

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials (RCTs) comparing induced hypothermia with normothermia.
  • Searched multiple databases (Cochrane, MEDLINE, EMBASE, LILACS) from inception to May 2014, including grey literature.
  • Included four RCTs with 1219 participants undergoing various neurosurgical procedures; data extraction and bias assessment were performed independently.

Main Results:

  • No statistically significant difference in mortality (RR 0.87, 95% CI 0.59-1.27) or poor neurological outcome (RR 0.80, 95% CI 0.61-1.04) between hypothermia and normothermia groups.
  • No significant differences in adverse events including infection (RR 1.20), myocardial infarction (RR 1.86), ischemic stroke (RR 0.93), or congestive heart failure (RR 0.85).
  • A weak statistically significant increased risk of infection was observed in patients cooled postoperatively (RR 1.77, 95% CI 1.05-2.98).

Conclusions:

  • The current evidence does not support the use of induced hypothermia for reducing mortality or severe neurological disability in neurosurgery patients.
  • No significant increase in harm was detected, although a slight increase in postoperative infection risk was noted with delayed cooling.
  • Further research is needed to clarify the role, optimal timing, and temperature targets for induced hypothermia in specific neurosurgical contexts.