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Hypothermia During Intracranial Aneurysm Surgery Trial

This study has been completed.
Information provided by:
National Institute of Neurological Disorders and Stroke (NINDS) Identifier:
First received: January 8, 2002
Last updated: June 23, 2005
Last verified: August 2003
This is a large multi-center, prospective, randomized trial designed to determine whether mild intraoperative hypothermia results in improved neurological outcome in patients with an acute subarachnoid hemorrhage (SAH) who are undergoing an open craniotomy to clip their aneurysms.

Condition Intervention Phase
Aneurysm Hypothermia Subarachnoid Hemorrhage Procedure: mild intraoperative hypothermia (33 degrees Celsius) Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by National Institute of Neurological Disorders and Stroke (NINDS):

Estimated Enrollment: 1000
Study Start Date: February 2000
Detailed Description:

The purpose of this trial is to determine whether mild intraoperative body cooling (body temperature = 33 degrees Celsius or 91.4 degrees Fahrenheit) during open neurosurgical craniotomies for aneurysm clipping improves neurological outcome (measured as 3 months after surgery) in patients who have suffered an aneurismal SAH. This may be the only NIH-funded trial to examine the impact of an intraoperative intervention on neurological outcome following any neurosurgical procedure, and is certainly the largest trial of its kind yet undertaken.

Many methods have been proposed to "protect" neurosurgical patients from neurological complications that can occur during and after intracranial vascular procedures. However, no treatment targeted at the intraoperative period has ever been systematically tested. Mild hypothermia was chosen as the treatment to be tested after an extensive review of medical literature and discussions with many anesthesiologists and neurosurgeons expert in the field suggested it was the intervention most likely to be beneficial. Hypothermia is also easily produced in the operating room and most anesthesiologists are familiar with managing mild hypothermia. As a result, the investigators felt that a trial of hypothermia was practical and reasonably safe.


Ages Eligible for Study:   19 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
  • Adult greater than 18 years old
  • Non-obese (body mass index less than 35kg/m2)
  • Non-pregnant
  • World Federation of Neurologic Surgeons preoperative Grade I, II, or III patients with acute SAH and scheduled to undergo open craniotomies for aneurysm clipping within 14 days of a documented SAH.
  • There must be no contraindications to cooling (e.g., sickle cell anemia, cryoglobulinemia, or severe Raynaud's disease).
  • Patients must also have pre-SAH Rankin disability scores of 0 to 1 (i.e., no serious pre-existing functional disability of any kind), and a perioperative course of Nimodipine (a calcium-channel blocker and the only drug known to improve outcome in patients with SAH) must be planned.
  • Each center must have approval from their local Human Subjects Committee to participate in the trial and written informed consent from either the patient, next-of-kin, or legal guardian is required.
  Contacts and Locations
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Please refer to this study by its identifier: NCT00029133

United States, Iowa
University of Iowa, Department of Anesthesia, 6505-5 John Colloton Pavilion
Iowa City, Iowa, United States, 52242
Sponsors and Collaborators
National Institute of Neurological Disorders and Stroke (NINDS)
Principal Investigator: Michael Todd, M.D. University of Iowa
  More Information

Publications automatically indexed to this study by Identifier (NCT Number): Identifier: NCT00029133     History of Changes
Other Study ID Numbers: R01NS038554 ( U.S. NIH Grant/Contract )
Study First Received: January 8, 2002
Last Updated: June 23, 2005

Keywords provided by National Institute of Neurological Disorders and Stroke (NINDS):
subarachnoid intracranial hemorrhage

Additional relevant MeSH terms:
Subarachnoid Hemorrhage
Intracranial Aneurysm
Pathologic Processes
Vascular Diseases
Cardiovascular Diseases
Body Temperature Changes
Signs and Symptoms
Intracranial Hemorrhages
Cerebrovascular Disorders
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Intracranial Arterial Diseases processed this record on September 21, 2017