Safety Study to Evaluate the Effect of Lowering Body Temperature During Cochlear Implantation

This study has been terminated.
(as specified in the protocol)
Sponsor:
Information provided by (Responsible Party):
University of Miami
ClinicalTrials.gov Identifier:
NCT00375882
First received: September 11, 2006
Last updated: August 14, 2014
Last verified: August 2014
  Purpose

Hypothesis: Mild Hypothermia has a protective effect on residual hearing of patients undergoing cochlear implantation


Condition Intervention Phase
Hypothermia
Procedure: hypothermia
Procedure: cochlear implantation with mild hypothermia
Phase 2

Study Type: Interventional
Study Design: Endpoint Classification: Safety Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Mild Hypothermia During Cochlear Implantation

Resource links provided by NLM:


Further study details as provided by University of Miami:

Primary Outcome Measures:
  • To determine if mild hypothermia has a protective effect on residual hearing of patients undergoing cochlear implantation. [ Time Frame: one month post cochlear implantation ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • To determine if mild hypothermia has a protective effect on residual hearing of patients undergoing cochlear implantation [ Time Frame: one year post cochlear implantation ] [ Designated as safety issue: No ]

Enrollment: 19
Study Start Date: March 2006
Study Completion Date: February 2010
Primary Completion Date: February 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
cochlear implantation with mild hypothermia Procedure: hypothermia Procedure: cochlear implantation with mild hypothermia

Detailed Description:

Hypothermia has been shown to have a protective effect following trauma to the central nervous system and the peripheral auditory system. We have previously demonstrated a protective effect of mild hypothermia on auditory function caused by cochlear implant electrodes in animal models. Preservation of residual hearing of patients undergoing cochlear implantation is highly desirable and based on these animal studies, it may be possible to achieve in human subjects using mild degrees of hypothermia. We propose to investigate the hypothesized protective effect of intra-operative hypothermia on adult subjects undergoing cochlear implantation.

Inclusion Criteria: Adults greater than or equal to 18 years of age with some measurable auditory function who are undergoing cochlear implantation as routine management of severe to profound hearing loss.

Exclusion Criteria: Pure tone average hearing (mean of .5, 1 and 2 KHz) worse than 100dB; Age > 70 years; History of arrhythmia or ischemic heart disease; sickle cell trait or disease; immune incompetence; coagulation disorders; revision cochlear implant; body-mass index > 35; cold related disorders.

Phase I: Up to 40 healthy adult subjects who have qualified for CI will undergo implantation with core body temperature lowered to 34 degree Centigrade for approximately one hour before electrode insertion and 30 minutes after insertion. Otherwise, the surgical technique will be unchanged from our standard procedure.

The heating/cooling blanket is an FDA approved device. similar temperature controlling blankets are used in virtually all operations done under general anesthesia. Each subject's temperature will be gradually lowered only after they are put to sleep. Warming will being at least 30 minutes before the subject is awakened. We will measure and record the subject's temperature every 5 to 15 minutes while they are in the operating room and also while they are in the recovery room.

Each subject will undergo a battery of audiometric tests (CNC words, HINT sentences, pure tone thresholds, and immittance) within one month prior to implantation, at one month post operatively, at 6 months post operatively and 1 year postoperatively. Outcomes will be analyzed by PI after 10 subjects have completed the 1 month test interval. If outcomes indicate proof of principle (measurable pure tone responses in greater than or equal to 60% of subjects), phase two of the study will be initiated. If not, outcomes will be analyzed after 20, 30, and 40 subjects until evidence of hearing conservation or lack of it is established, leading to the following study or precluding it.

Phase II: Up to 80 healthy adults who have qualified for CI will be randomized into control group (CI surgery using standard procedure at core body temperature of 37 degree C) or active group (identical core body temperature of 34 degrees C). Subjects will be randomized using a random table of numbers. The patient, surgeon and audiologist will be blinded to the group assignment. Only the study coordinator will have the sequestered and locked list of randomization and blinding. Only the anesthesiologist will know the patients' assignment at the time of surgery. The audiologist will not be present in the O.R. or in the outpatient clinic, but will only test the patient post surgery. Each subject will undergo a battery of audiometric tests (CNC words, HINT sentences, pure tone thresholds, and immittance) just prior to implantation, at 1 month post operatively, at 6 months post operatively and at 1 year postoperatively.

  Eligibility

Ages Eligible for Study:   18 Years to 70 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Adults undergoing measurable auditory function who are undergoing cochlear implantation as routine management of severe to profound hearing loss.

Exclusion Criteria:

  • Pure tone average hearing ( mean of .5, 1 adn 2 KHz) worse than 100dB
  • Age> 70 years
  • History of arrhythmia or ischemic heart disease
  • Sickle cell trait or disease
  • Immune incompetence; coagulation disorders
  • Revision cochlear implant; body-mass index >35
  • Cold related disorders
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00375882

Locations
United States, Florida
University of Miami, Miller School of Medicine, Ear Institute
Miami, Florida, United States, 33136
Sponsors and Collaborators
University of Miami
Investigators
Principal Investigator: Thomas J Balkany, M.D. University of Miami
  More Information

No publications provided

Responsible Party: University of Miami
ClinicalTrials.gov Identifier: NCT00375882     History of Changes
Other Study ID Numbers: 20060088
Study First Received: September 11, 2006
Last Updated: August 14, 2014
Health Authority: United States: Institutional Review Board

Additional relevant MeSH terms:
Hypothermia
Body Temperature Changes
Signs and Symptoms

ClinicalTrials.gov processed this record on October 29, 2014