The impact of injury of the chorda tympani nerve during primary stapes surgery or cochlear implantation on taste function, quality of life and food preferences: A study protocol for a double-blind prospective prognostic association study

The chorda tympani nerve (CTN) is a mixed nerve, which carries sensory and parasympathetic fibres. The sensory component supplies the taste sensation of the anterior two-thirds of the ipsilateral side of the tongue. During middle ear surgery the CTN is exposed and frequently stretched or sacrificed,...

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Veröffentlicht in:PloS one 2023-05, Vol.18 (5), p.e0284571-e0284571
Hauptverfasser: Blijleven, Esther E, Wegner, Inge, Stokroos, Robert J, Thomeer, Hans G X M
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Wegner, Inge
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Thomeer, Hans G X M
description The chorda tympani nerve (CTN) is a mixed nerve, which carries sensory and parasympathetic fibres. The sensory component supplies the taste sensation of the anterior two-thirds of the ipsilateral side of the tongue. During middle ear surgery the CTN is exposed and frequently stretched or sacrificed, because it lacks a bony covering as it passes through the middle ear. Injury may cause hypogeusia, ageusia or altered taste sensation of the ipsilateral side of the tongue. To date, there is no consensus regarding which type of CTN injury (sacrificing or stretching), during middle ear surgery, leads to the least burden for the patient. A double-blind prospective prognostic association study was designed in a single medical centre in the Netherlands to determine the effect of CTN injury on postoperative taste disturbance and quality of life. 154 patients, who will undergo primary stapes surgery or cochlear implantation will be included. The taste sensation, food preferences and quality of life of these patients will be evaluated preoperatively and at one week, six weeks and six months postoperatively using the Taste Strip Test, Electrogustometry, supplementary questionnaire on taste disturbance, Macronutrient and Taste Preference Ranking Task, Appetite, Hunger and Sensory Perception questionnaire and Questionnaire of Olfactory Disorders to assess the association of these outcomes with CTN injury. Evaluation of olfactory function will only take place preoperatively and at one week postoperatively using the Sniffin' Sticks. The patient and outcome assessor are blinded to the presence or absence of CTN injury. This study is the first to validate and quantify the effect of chorda tympani nerve injury on taste function. The findings of this study may lead to evidence-based proof of the effect of chorda tympani injury on taste function with consequences for surgical strategies. Netherlands Trial Register NL9791. Registered on 10 October 2021.
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The sensory component supplies the taste sensation of the anterior two-thirds of the ipsilateral side of the tongue. During middle ear surgery the CTN is exposed and frequently stretched or sacrificed, because it lacks a bony covering as it passes through the middle ear. Injury may cause hypogeusia, ageusia or altered taste sensation of the ipsilateral side of the tongue. To date, there is no consensus regarding which type of CTN injury (sacrificing or stretching), during middle ear surgery, leads to the least burden for the patient. A double-blind prospective prognostic association study was designed in a single medical centre in the Netherlands to determine the effect of CTN injury on postoperative taste disturbance and quality of life. 154 patients, who will undergo primary stapes surgery or cochlear implantation will be included. The taste sensation, food preferences and quality of life of these patients will be evaluated preoperatively and at one week, six weeks and six months postoperatively using the Taste Strip Test, Electrogustometry, supplementary questionnaire on taste disturbance, Macronutrient and Taste Preference Ranking Task, Appetite, Hunger and Sensory Perception questionnaire and Questionnaire of Olfactory Disorders to assess the association of these outcomes with CTN injury. Evaluation of olfactory function will only take place preoperatively and at one week postoperatively using the Sniffin' Sticks. The patient and outcome assessor are blinded to the presence or absence of CTN injury. This study is the first to validate and quantify the effect of chorda tympani nerve injury on taste function. The findings of this study may lead to evidence-based proof of the effect of chorda tympani injury on taste function with consequences for surgical strategies. Netherlands Trial Register NL9791. Registered on 10 October 2021.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>37200313</pmid><doi>10.1371/journal.pone.0284571</doi><tpages>e0284571</tpages><orcidid>https://orcid.org/0000-0001-9011-1393</orcidid><oa>free_for_read</oa></addata></record>
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identifier ISSN: 1932-6203
ispartof PloS one, 2023-05, Vol.18 (5), p.e0284571-e0284571
issn 1932-6203
1932-6203
language eng
recordid cdi_plos_journals_2815236611
source MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; Public Library of Science (PLoS)
subjects Ageusia - etiology
Analysis
Appetite
Biology and Life Sciences
Care and treatment
Chorda tympani
Chorda Tympani Nerve - injuries
Chorda Tympani Nerve - surgery
Cochlea
Cochlear Implantation - adverse effects
Cochlear implants
Coronaviruses
COVID-19
Double-blind studies
Dysgeusia - etiology
Facial nerve
Fibers
Food
Food habits
Food Preferences
Food quality
Health care facilities
Humans
Hunger
Implantation
Informed consent
Injuries
Medical prognosis
Medical research
Medicine and Health Sciences
Medicine, Experimental
Middle ear
Nerves
Olfaction
Otolaryngology
Parasympathetic nervous system
Participation
Patient outcomes
Patients
Prognosis
Prospective Studies
Quality of Life
Questionnaires
Randomized Controlled Trials as Topic
Sensation
Sensory neurons
Sensory perception
Social Sciences
Stapes Surgery - adverse effects
Study Protocol
Surgeons
Surgery
Taste
Taste - physiology
Taste disorders
Tongue
Variables
Wounds and injuries
title The impact of injury of the chorda tympani nerve during primary stapes surgery or cochlear implantation on taste function, quality of life and food preferences: A study protocol for a double-blind prospective prognostic association study
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