Study Results
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Basic Information
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COMPLETED
NA
147 participants
INTERVENTIONAL
2020-12-08
2023-06-09
Brief Summary
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Detailed Description
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Surgical removal of palatal tonsils is among the most common ear, nose and throat operations in adults in Finland. The vast majority of these operations are done for recurrent and chronic tonsillitis. Internationally accepted guidelines for the treatment of these diseases are lacking and the indications for tonsil surgery are practice-based rather than evidence-based. The choice of the surgical technique further confuses the picture. The traditional surgical technique has been the total removal of tonsils (tonsillectomy, TE). The relatively recent introduction of partial resection of tonsils, namely tonsillotomy (TT), is suggested to have the benefits of less postoperative pain and smaller risk of post-operative hemorrhage as compared to TE. The relative efficacy of these two techniques to alleviate infective tonsillar diseases is still unclear.
Objectives
The main aim of this study is to obtain reliable evidence on, whether tonsil surgery improves the quality of life in adult patients suffering from recurrent or chronic tonsillitis, and whether the lighter TT would be as effective as TE. We will also compare the scores of a generic quality of life questionnaire as well as several other subjective and objective beneficial and harmful outcomes between the groups.
Methods
In this pragmatic multi-center randomized controlled trial, adult patients suffering from recurrent or chronic tonsillitis will be randomly allocated to three groups: tonsillotomy group (TT), tonsillectomy group (TE) and control group with watchful waiting (WW) in ratio 2:2:1. The patients in the surgical groups are blinded to the operation type (TT or TE). Our hypothesis is that both surgical treatments are more effective than watchful waiting in enhancing quality of life without significant risks (superiority assumption) and that TT is non-inferior to TE when the surgical groups are compared (non-inferiority assumption). Our principal outcome is disease-specific quality of life questionnaire score (Tonsillectomy Outcome Inventory (TOI)-14) at 6 months follow-up. We have validated this questionnaire in Finnish and explored the interpretation of the scores. Secondary outcomes have been listed in the Outcomes section.
Separate random allocation lists for the main research center (Oulu University Hospital) and for the four other centers collectively as well as for recurrent and for chronic tonsillitis will be used. Random permuted blocks is used with block size varying between 5 and 10. Based on our earlier study, the principal outcome, TOI-14 score, will most probably be left-truncated at zero and right-skewed. Therefore, both tobit-analysis and covariate analysis is used with log (1+y) transformation. The primary analysis has two phases. Firstly, the TOI-14 score in the combined surgical group (TT+TE) is compared to that in the WW group. Secondly, the score in the TT group is compared to that in the TE group. Effects will be estimated by adjusted mean differences in the log-transformed scores with 95% confidence intervals. Based on our earlier observational studies on the subject, the following covariates are included in the multivariable adjusted model: gender and baseline TOI-14 score together with stratification factors: enrolling center (Oulu vs. others) and main complaint (recurrent vs. chronic tonsillitis). In case there is missing data on the primary outcome, a multiple imputation method will be used. The analyses will be performed on an intention to treat basis. Per protocol analysis will be performed as sensitivity analysis and results from comparisons on secondary outcomes and subgroup analysis (main complaint) are used to generate hypothesis for future trials.
Conditions
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Study Design
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RANDOMIZED
PARALLEL
TREATMENT
SINGLE
Study Groups
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Tonsillectomy
Patients will undergo tonsillectomy under general anesthesia within three weeks after enrollment.
Tonsillectomy
Tonsillectomy is done by monopolar electrocautery, bipolar scissors or cold instruments. First the mucosa of the anterior palatinal arch is incised and tonsillar capsule identified, then tonsillar tissue is removed along the capsule. Any bleeding is coagulated either with monopolar or bipolar electrocautery.
Tonsillotomy
Patients will undergo tonsillotomy under general anesthesia within three weeks after enrollment.
Tonsillotomy
Tonsillotomy is done using monopolar electrosurgery, bipolar scissors or coblator device. Most of the tonsillar tissue is removed, exceeding the removal behind the line between anterior and posterior palatinal arch so that only thin layer of tonsil tissue is left over the tonsillar capsule.
Watchful waiting
Patients will be closely monitored for the 5-6 months monitoring period.
No interventions assigned to this group
Interventions
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Tonsillectomy
Tonsillectomy is done by monopolar electrocautery, bipolar scissors or cold instruments. First the mucosa of the anterior palatinal arch is incised and tonsillar capsule identified, then tonsillar tissue is removed along the capsule. Any bleeding is coagulated either with monopolar or bipolar electrocautery.
Tonsillotomy
Tonsillotomy is done using monopolar electrosurgery, bipolar scissors or coblator device. Most of the tonsillar tissue is removed, exceeding the removal behind the line between anterior and posterior palatinal arch so that only thin layer of tonsil tissue is left over the tonsillar capsule.
Other Intervention Names
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Eligibility Criteria
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Inclusion Criteria
* At least 4 episodes in the previous 12 months or at least 3 episodes in 6 months
* Episodes are disabling, prevent normal functioning and are severe enough for the patient to seek medical attention
* Episodes are thought to involve the palatine tonsils based on signs found during the episodes (e.g. edema, erythema, exudative tonsillitis, anterior cervical lymphadenitis)
* No throat cultures or antigen/molecular tests to show infection with group A streptococcus are needed
* Chronic tonsillitis:
* Recurrent or chronic throat pain for at least 6 months
* At least one symptom or sign that indicate that symptoms originate from the palatal tonsils (disturbing tonsil stones, halitosis, anterior cervical lymphadenitis, tonsillar exudates, abnormal tonsillar crypts)
* Symptomatic treatment has not been effective
Exclusion Criteria
* Pregnancy
* History of peritonsillar abscess
* Previous illness that make prompt same-day surgery unfeasible
* No electronic identity verification tools
18 Years
ALL
No
Sponsors
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Oulu University Hospital
OTHER
Responsible Party
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Olli-Pekka Alho, MD
Professor, MD
Principal Investigators
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Olli-Pekka Alho, MD, PhD
Role: PRINCIPAL_INVESTIGATOR
Oulu University Hospital, University of Oulu
Aleksi EJ Laajala, MD
Role: STUDY_CHAIR
Oulu University Hospital, University of Oulu
Paulus Tokola, MD
Role: STUDY_CHAIR
Oulu University Hospital, University of Oulu
Timo J Autio, MD, PhD
Role: STUDY_CHAIR
Oulu University Hospital
Timo J Koskenkorva, MD, PhD
Role: STUDY_CHAIR
University of Oulu
Pasi Ohtonen, M. Sc.
Role: STUDY_CHAIR
Division of Operative Care, Oulu University Hospital, Finland
Esa Läärä, PhD.
Role: STUDY_CHAIR
Oulu University
Locations
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Lapland Central Hospital
Rovaniemi, Lapland, Finland
Länsi-Pohja Central Hospital
Kemi, , Finland
Keski-Pohjanmaa Central Hospital
Kokkola, , Finland
Oulu University Hospital
Oulu, , Finland
Seinäjoki Central Hospital
Seinäjoki, , Finland
Turun yliopistollinen keskussairaala
Turku, , Finland
Vaasan keskussairaala
Vaasa, , Finland
Countries
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References
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Laajala A, Autio TJ, Ohtonen P, Alho OP, Koskenkorva TJ. Interpretation of Tonsillectomy Outcome Inventory-14 scores: a prospective matched cohort study. Eur Arch Otorhinolaryngol. 2020 May;277(5):1499-1505. doi: 10.1007/s00405-020-05832-z. Epub 2020 Feb 14.
Koskenkorva T, Koivunen P, Laara E, Alho OP. Predictive factors for quality of life after tonsillectomy among adults with recurrent pharyngitis: a prospective cohort study. Clin Otolaryngol. 2014 Aug;39(4):216-23. doi: 10.1111/coa.12263.
Laajala A, Tokola P, Autio TJ, Koskenkorva T, Tastula M, Ohtonen P, Laara E, Alho OP. Total or partial tonsillar resection (tonsillectomy or tonsillotomy) to change the quality of life for adults with recurrent or chronic tonsillitis: study protocol for a randomised controlled trial. Trials. 2021 Sep 15;22(1):617. doi: 10.1186/s13063-021-05539-4.
Provided Documents
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Document Type: Statistical Analysis Plan
Other Identifiers
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Diary number 113/2020
Identifier Type: -
Identifier Source: org_study_id
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