Clinical trial NCT04620343: HelpILO - RCT on EILO Treatment
Official title: Exercise Induced Laryngeal Obstruction; a Randomized Controlled Treatment Trial
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Exercise Induced Laryngeal Obstruction (EILO)
Keywords: Larynx
Obstruction
Exercise
Lead sponsor: Haukeland University Hospital
Sponsor class: OTHER
First posted: 2020-11-09
Enrollment: 350
Sex: ALL
Minimum age (years): 12
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: FACTORIAL
Primary purpose: TREATMENT

Brief summary: Exercise induced laryngeal obstruction (EILO) is a common cause of exertional breathing problems in young individuals, caused by paradoxical inspiratory adduction of laryngeal structures, and diagnosed by continuous visualization of the larynx during high intensity exercise.

Detailed description: Exercise induced laryngeal obstruction (EILO) is a common cause of exertional breathing problems in young individuals, caused by paradoxical inspiratory adduction of laryngeal structures, and diagnosed by continuous visualization of the larynx during high intensity exercise.

Studies indicate that EILO responds positively to treatment interventions; however, the investigators lack randomized controlled studies to confirm this (10-15). This study aims to provide evidence-based information on interventions commonly applied to treat EILO. Background: Exercise induced laryngeal obstruction (EILO) is a common cause of exertional breathing problems in young individuals, caused by paradoxical inspiratory adduction of laryngeal structures, and diagnosed by continuous visualization of the larynx during high intensity exercise. Empirical data suggest that EILO consists of different subtypes that require different therapeutic approaches. However, currently applied treatment schemes do not rest on randomized controlled trials. This study aims to provide evidence-based information on treatment schemes commonly applied in patients with EILO.

Methods: Consenting patients consecutively diagnosed with EILO at Haukeland University Hospital will be randomized into four different conservative treatment arms, selected on the basis of promising reports from non-randomized studies: (A) standardized information and breathing advice only (IBA), (B) IBA plus inspiratory muscle training, (C) IBA plus speech therapy, and (D) IBA plus provision of both inspiratory muscle training and speech therapy. Differential effects in predefined EILO subtypes will be addressed. Patients failing the conservative approach and otherwise qualifying for surgical treatment by current department policy will be considered for randomization into (E) standard or (F) minimal laser supraglottoplasty, and a "wait-and-see" control group. Power calculations will be based on the main outcomes, laryngeal adduction during peak exercise, rated by a validated scoring system before and after the interventions.

Discussion: The study will provide evidence-based information on the treatment of EILO, listed as a priority in a recent statement issued by the European Respiratory Society, requested by clinicians and researchers engaged in this area, and relevant to 5-7% of young people.

Eligibility criteria: Inclusion Criteria:

* EILO with CLE score at peak exercise graded as ≥ 2 at glottic or supraglottic level and
* Respiratory complaints to an extent that the patient wants further treatment and follow-up.

Exclusion Criteria:

* Breathing problems caused by disorders other than EILO or well controlled asthma.
* Perceived to be unable to perform repeated maximal cardiopulmonary treadmill exercise tests, or failing to accept the procedures required for repeated successful CLE tests, or unable to perform any of the other examinations required by the protocol.
* Abnormal anatomy at rest in the laryngeal region or the upper airways.
* Age below 12 years

Primary outcomes:
measure: Questionnaires
timeFrame: Day 1
measure: Pulmonary function and exercise test - Spirometry 1
timeFrame: Through study completion, on average 6 months
measure: Pulmonary function and exercise test - Spirometry 2
timeFrame: Through study completion, on average 6 months
measure: Pulmonary function and exercise test - Spirometry 3
timeFrame: Through study completion, on average 6 months
measure: Continuous Laryngoscopy Exercise test (CLE-test) and scoring
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - Variables of gas exchange
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - duration of run
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - distance of run
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - oxygen consumption
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - CO2 production
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - respiratory rates.
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - heart rates.
timeFrame: Through study completion, on average 6 months
measure: Cardiopulmonary exercise (CPX) data - Exercise tidal flow/volume loops
timeFrame: Through study completion, on average 6 months
measure: Continuous laryngoscopy exercise (CLE) with pressure recordings
timeFrame: During Phase 3, average duration 6 months.
Secondary outcomes:
Other outcomes:
Locations:
city: Bergen
country: Norway
facility: Haukeland University Hospital, Children and Youth Clinic
state: Vestland
Study officials:
affiliation: Haukeland University Hospital
name: Hege H Clemm, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Halvorsen T, Clemm HSH, Vollsaeter M, Roksund OD. Conundrums of Exercise-related Breathing Problems. Epiglottic, Laryngeal, or Bronchial Obstruction? Am J Respir Crit Care Med. 2020 Nov 15;202(10):e142-e143. doi: 10.1164/rccm.201910-1921IM. No abstract available.
citation: Engan M, Engeseth MS, Fevang S, Vollsaeter M, Eide GE, Roksund OD, Halvorsen T, Clemm H. Predicting physical activity in a national cohort of children born extremely preterm. Early Hum Dev. 2020 Jun;145:105037. doi: 10.1016/j.earlhumdev.2020.105037. Epub 2020 Apr 11.
citation: Fretheim-Kelly ZL, Halvorsen T, Clemm H, Roksund O, Heimdal JH, Vollsaeter M, Fintl C, Strand E. Exercise Induced Laryngeal Obstruction in Humans and Equines. A Comparative Review. Front Physiol. 2019 Oct 30;10:1333. doi: 10.3389/fphys.2019.01333. eCollection 2019.
citation: Sandnes A, Hilland M, Vollsaeter M, Andersen T, Engesaeter IO, Sandvik L, Heimdal JH, Halvorsen T, Eide GE, Roksund OD, Clemm HH. Severe Exercise-Induced Laryngeal Obstruction Treated With Supraglottoplasty. Front Surg. 2019 Jul 31;6:44. doi: 10.3389/fsurg.2019.00044. eCollection 2019.
citation: Sandnes A, Andersen T, Clemm HH, Hilland M, Vollsaeter M, Heimdal JH, Eide GE, Halvorsen T, Roksund OD. Exercise-induced laryngeal obstruction in athletes treated with inspiratory muscle training. BMJ Open Sport Exerc Med. 2019 Jan 18;5(1):e000436. doi: 10.1136/bmjsem-2018-000436. eCollection 2019.
citation: Fretheim-Kelly Z, Halvorsen T, Heimdal JH, Strand E, Vollsaeter M, Clemm H, Roksund O. Feasibility and tolerability of measuring translaryngeal pressure during exercise. Laryngoscope. 2019 Dec;129(12):2748-2753. doi: 10.1002/lary.27846. Epub 2019 Jan 30.
citation: Andersen TM, Sandnes A, Fondenes O, Clemm H, Halvorsen T, Nilsen RM, Tysnes OB, Heimdal JH, Vollsaeter M, Roksund OD. Laryngoscopy Can Be a Valuable Tool for Unexpected Therapeutic Response in Noninvasive Respiratory Interventions. Respir Care. 2018 Nov;63(11):1459-1461. doi: 10.4187/respcare.06674. No abstract available.
citation: Clemm HSH, Sandnes A, Vollsaeter M, Hilland M, Heimdal JH, Roksund OD, Halvorsen T. The Heterogeneity of Exercise-induced Laryngeal Obstruction. Am J Respir Crit Care Med. 2018 Apr 15;197(8):1068-1069. doi: 10.1164/rccm.201708-1646IM. No abstract available.
citation: Roksund OD, Heimdal JH, Clemm H, Vollsaeter M, Halvorsen T. Exercise inducible laryngeal obstruction: diagnostics and management. Paediatr Respir Rev. 2017 Jan;21:86-94. doi: 10.1016/j.prrv.2016.07.003. Epub 2016 Jul 18.
citation: Heimdal JH, Roksund OD, Halvorsen T, Skadberg BT, Olofsson J. Continuous laryngoscopy exercise test: a method for visualizing laryngeal dysfunction during exercise. Laryngoscope. 2006 Jan;116(1):52-7. doi: 10.1097/01.mlg.0000184528.16229.ba.
citation: Maat RC, Roksund OD, Olofsson J, Halvorsen T, Skadberg BT, Heimdal JH. Surgical treatment of exercise-induced laryngeal dysfunction. Eur Arch Otorhinolaryngol. 2007 Apr;264(4):401-7. doi: 10.1007/s00405-006-0216-6. Epub 2007 Jan 4.
citation: Maat RC, Roksund OD, Halvorsen T, Skadberg BT, Olofsson J, Ellingsen TA, Aarstad HJ, Heimdal JH. Audiovisual assessment of exercise-induced laryngeal obstruction: reliability and validity of observations. Eur Arch Otorhinolaryngol. 2009 Dec;266(12):1929-36. doi: 10.1007/s00405-009-1030-8. Epub 2009 Jul 8.
citation: Roksund OD, Maat RC, Heimdal JH, Olofsson J, Skadberg BT, Halvorsen T. Exercise induced dyspnea in the young. Larynx as the bottleneck of the airways. Respir Med. 2009 Dec;103(12):1911-8. doi: 10.1016/j.rmed.2009.05.024. Epub 2009 Sep 26.
citation: Maat RC, Hilland M, Roksund OD, Halvorsen T, Olofsson J, Aarstad HJ, Heimdal JH. Exercise-induced laryngeal obstruction: natural history and effect of surgical treatment. Eur Arch Otorhinolaryngol. 2011 Oct;268(10):1485-92. doi: 10.1007/s00405-011-1656-1. Epub 2011 Jun 5.
citation: Sandnes A, Andersen T, Hilland M, Ellingsen TA, Halvorsen T, Heimdal JH, Roksund OD. Laryngeal movements during inspiratory muscle training in healthy subjects. J Voice. 2013 Jul;27(4):448-53. doi: 10.1016/j.jvoice.2013.02.010. Epub 2013 May 15.
citation: Roksund OD, Heimdal JH, Olofsson J, Maat RC, Halvorsen T. Larynx during exercise: the unexplored bottleneck of the airways. Eur Arch Otorhinolaryngol. 2015 Sep;272(9):2101-9. doi: 10.1007/s00405-014-3159-3. Epub 2014 Jul 18.
citation: Christensen PM, Heimdal JH, Christopher KL, Bucca C, Cantarella G, Friedrich G, Halvorsen T, Herth F, Jung H, Morris MJ, Remacle M, Rasmussen N, Wilson JA; ERS/ELS/ACCP Task Force on Inducible Laryngeal Obstructions. ERS/ELS/ACCP 2013 international consensus conference nomenclature on inducible laryngeal obstructions. Eur Respir Rev. 2015 Sep;24(137):445-50. doi: 10.1183/16000617.00006513.
citation: Norlander K, Christensen PM, Maat RC, Halvorsen T, Heimdal JH, Moren S, Rasmussen N, Nordang L. Comparison between two assessment methods for exercise-induced laryngeal obstructions. Eur Arch Otorhinolaryngol. 2016 Feb;273(2):425-30. doi: 10.1007/s00405-015-3758-7. Epub 2015 Sep 8.
citation: Hilland M, Roksund OD, Sandvik L, Haaland O, Aarstad HJ, Halvorsen T, Heimdal JH. Congenital laryngomalacia is related to exercise-induced laryngeal obstruction in adolescence. Arch Dis Child. 2016 May;101(5):443-8. doi: 10.1136/archdischild-2015-308450. Epub 2016 Feb 23.
citation: Roksund OD, Olin JT, Halvorsen T. Working Towards a Common Transatlantic Approach for Evaluation of Exercise-Induced Laryngeal Obstruction. Immunol Allergy Clin North Am. 2018 May;38(2):281-292. doi: 10.1016/j.iac.2018.01.002. Epub 2018 Feb 19.