http://stroke.ahajournals.org/content/47/12/2888.abstract?etoc
Abstract
Background and Purpose—Therapeutic
hypothermia is a potent neuroprotectant approved for cerebral
protection after neonatal hypoxia-ischemia and cardiac arrest.
Therapeutic hypothermia for acute ischemic stroke is safe and feasible
in pilot trials. We designed a study protocol to provide safer, faster
therapeutic hypothermia in stroke patients.
Methods—Safety
procedures and 4°C saline infusions for faster cooling were added to
the ICTuS trial (Intravascular Cooling in the Treatment of Stroke)
protocol. A femoral venous intravascular cooling catheter after
intravenous recombinant tissue-type plasminogen activator in eligible
patients provided 24 hours cooling followed by a 12-hour rewarm. Serial
safety assessments and imaging were performed. The primary end point was
3-month modified Rankin score 0,1.
Results—Of
the intended 1600 subjects, 120 were enrolled before the study was
stopped. Randomly, 63 were to receive hypothermia plus antishivering
treatment and 57 normothermia. Compared with previous studies, cooling
rates were improved with a cold saline bolus, without fluid overload.
The intention-to-treat primary outcome of 90-day modified Rankin Score
0,1 occurred in 33% hypothermia and 38% normothermia subjects, odds
ratio (95% confidence interval) of 0.81 (0.36–1.85). Serious adverse
events occurred equally. Mortality was 15.9% hypothermia and 8.8%
normothermia subjects, odds ratio (95% confidence interval) of 1.95
(0.56–7.79). Pneumonia occurred in 19% hypothermia versus 10.5% in
normothermia subjects, odds ratio (95% confidence interval) of 1.99
(0.63–6.98). 19% pneumonia is considered safe, especially for the elderly?
Conclusions—Intravascular
therapeutic hypothermia was confirmed to be safe and feasible (unknown as to efficacy) in
recombinant tissue-type plasminogen activator–treated acute ischemic
stroke patients. Protocol changes designed to reduce pneumonia risk
appeared to fail, although the sample is small.
Clinical Trial Registration—URL: http://www.clinicaltrials.gov. Unique identifier: NCT01123161.
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