Antioxidants during stapedotomy

SND-ID: SND 0974

Creator/Principal investigator(s)

Anders Fridberger - Linköping University, Department of Clinical and Experimental Medicine, IKE


Background: Otosclerosis is a disorder that impairs middle ear function, leading to conductive hearing loss. Surgical treatment results in large improvement of hearing at low sound frequencies, but high-frequency hearing often suffers. A likely reason for this is that inner ear sensory cells are damaged by surgical trauma and loud sounds generated during the operation. Animal studies have shown that antioxidants such as N-Acetylcysteine can protect the inner ear from noise, surgical trauma, and some ototoxic substances, but it is not known if this works in humans. This trial was performed to determine whether antioxidants improve surgical results at high frequencies.

Methods: We performed a randomized, double-blind and placebo-controlled parallel group clinical trial at three Swedish university clinics. Using block-stratified randomization, 156 adult patients undergoing stapedotomy were assigned to intravenous N-Acetylcysteine (150 mg/kg body weight) or matching placebo (1:1 ratio), starting one hour before surgery. The primary outcome was the hearing threshold at 6 and 8 kHz; secondary outco

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Research principal, contributors, and funding

Research principal

Linköping University

Responsible department/unit

Department of Clinical and Experimental Medicine, IKE

Protection and ethical review

Ethics Review

Stockholm - Ref. 2007/305-31

Method and time period

Unit of analysis


Patients who had surgery for otosclerosis at Karolinska University Hospital in Solna and Huddinge, and at Uppsala University Hospital.

Study design

Double-blind randomised trial

Sampling procedure

Probability: Stratified

Time period(s) investigated

2007-12-01 – 2013-04-30

Geographic coverage

Geographic spread

Geographic description: Stockholm, Uppsala


Fridberger A. A randomised, double blind trial of N-acetylcysteine for hearing protection during stapes surgery. PLOS One 2014, In press.

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Antioxidants in stapedotomy

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Associated documentation


The dataset contains 9 variables:
"id" is a number with range 1 - 145, unique for each patient.
"medicin" denotes the type of treatment given (possible values are "N-Acetylcysteine" or "Placebo").
"beta" denotes whether the steroid betametason was given before surgery.
"gender" is "f" for female patients and "m" for males.
"weight" is each patient's weight in kg.
"age" is the age (in years, at the time of surgery).
"freq" denotes the type of measurement performed. There are several possible valu

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Version 1.0


Anders Fridberger. Linköping University (2014). Antioxidants in stapedotomy. Swedish National Data Service. Version 1.0.

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Data format / data structure


Creator/Principal investigator(s)

Anders Fridberger - Linköping University, Department of Clinical and Experimental Medicine, IKE

Time period(s) investigated

2007-12-01 – 2013-04-30

Data collection

  • Mode of collection: Physical measurements and tests
  • Time period(s) for data collection: 2007-12-01–2013-04-30
  • Data collector: Karolinska university Hospital and Uppsala University Hospital
  • Source of the data: Population group



Number of individuals/objects


Published: 2015-01-08
Last updated: 2017-01-02