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Fretheim-Kelly Z, Clemm HSH, Røksund OD, Hilland M, Vollsæter M, Halvorsen T. Translaryngeal Resistance: A Measurement to Assist Decision Making in Upper Airway Pathology. Am J Respir Crit Care Med 2023; 208:e32-e34. [PMID: 37219897 DOI: 10.1164/rccm.202205-0961im] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 05/19/2023] [Indexed: 05/24/2023] Open
Affiliation(s)
- Zoe Fretheim-Kelly
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway
- Department of Pediatrics and
| | | | - Ola Drange Røksund
- Department of Pediatrics and
- Faculty of Health and Social Sciences, Western Norway University of Applied Sciences, Bergen, Norway; and
| | - Magnus Hilland
- Department of Otolaryngology, Head and Neck Surgery, Haukeland University Hospital, Bergen, Norway
| | - Maria Vollsæter
- Department of Pediatrics and
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - Thomas Halvorsen
- Department of Pediatrics and
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Norwegian School of Sports Sciences, Oslo, Norway
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Fretheim-Kelly Z, Engan M, Clemm H, Andersen T, Heimdal JH, Strand E, Halvorsen T, Røksund O, Vollsæter M. Reliability of trans-laryngeal airway resistance measurements during maximal exercise. ERJ Open Res 2022; 8:00581-2021. [PMID: 35309036 PMCID: PMC8923134 DOI: 10.1183/23120541.00581-2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 01/11/2022] [Indexed: 11/05/2022] Open
Abstract
Objective: Exercised induced laryngeal obstruction (EILO) is an important cause of exertional dyspnea. The diagnosis rests on visual judgement of relative changes of the laryngeal inlet during continuous laryngoscopy exercise (CLE) tests, but we lack objective measures that reflect functional consequences. We aimed to investigate repeatability and normal values of trans-laryngeal airway resistance measured at maximal intensity exercise.Methods: Thirty-one healthy non-smokers without exercise related breathing problems were recruited. Participants performed two CLE tests enabling verified positioning of two pressure sensors, one at the tip of the epiglottis (supraglottic) and one by the fifth tracheal ring (subglottic). Airway pressure and flow data were continuously collected breath-by-breath and used to calculate trans-laryngeal resistance at peak exercise. Laryngeal obstruction was assessed according to a standardised CLE-score system.Results: Data from 26 participants (16 females) with two successful tests and equal CLE scores on both test-sessions were included in the trans-laryngeal resistance repeatability analyses. The coefficient of repeatability (CR) was 0.62 cmH2O·L−1·s−1, corresponding to a CR% of 21%. Mean (sd) trans-laryngeal airway resistance (cmH2O·L−1·s−1) in participants with no laryngeal obstruction (n=15) was 2.88 (0.50) in females and 2.18 (0.50) in males. Higher CLE scores correlated with higher trans-laryngeal resistance in females (r=0.81, p<0.001).Conclusions: This study establishes trans-laryngeal airway resistance obtained during exercise as a reliable parameter in respiratory medicine, opening the door for more informed treatment decisions and future research on the role of the larynx in health and disease.
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Clemm H, Røksund OD, Andersen T, Heimdal JH, Karlsen T, Hilland M, Fretheim-Kelly Z, Hufthammer KO, Sandnes A, Hjelle S, Vollsæter M, Halvorsen T. Exercise-induced Laryngeal Obstruction: Protocol for a Randomized Controlled Treatment Trial. Front Pediatr 2022; 10:817003. [PMID: 35198517 PMCID: PMC8858975 DOI: 10.3389/fped.2022.817003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 01/10/2022] [Indexed: 12/24/2022] Open
Abstract
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, possibly requiring different therapeutic approaches. Currently applied treatments do not rest on randomized controlled trials, and international guidelines based on good evidence can therefore not be established. This study aims to provide evidence-based information on treatment schemes commonly applied in patients with EILO. METHODS AND ANALYSIS Consenting patients consecutively diagnosed with EILO at Haukeland University Hospital will be randomized into four non-invasive treatment arms, based on 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 inspiratory muscle training and speech therapy. Differential effects in predefined EILO subtypes will be addressed. Patients failing the non-invasive approach and otherwise qualifying for surgical treatment by current department policy will be considered for randomization into (E) standard or (F) minimally invasive laser supraglottoplasty or (G) no surgery. Power calculations are based on the main outcomes, laryngeal adduction during peak exercise, rated by a validated scoring system before and after the interventions. ETHICS AND DISSEMINATION The study will assess approaches to EILO treatments that despite widespread use, are insufficiently tested in structured, verifiable, randomized, controlled studies, and is therefore considered ethically sound. The study will provide knowledge 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. Dissemination will occur in peer-reviewed journals, at relevant media platforms and conferences, and by engaging with patient organizations and the healthcare bureaucracy.
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Affiliation(s)
- Hege Clemm
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway
| | - Ola D Røksund
- Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway.,Faculty of Health and Social Sciences, Western Norway University of Applied Sciences, Bergen, Norway.,Department of Otolaryngology and Head and Neck Surgery, Haukeland University Hospital, Bergen, Norway
| | - Tiina Andersen
- Faculty of Health and Social Sciences, Western Norway University of Applied Sciences, Bergen, Norway.,Department of Physiotherapy, Haukeland University Hospital, Bergen, Norway.,Norwegian Advisory Unit on Home Mechanical Ventilation, Thoracic Department, Haukeland University Hospital, Bergen, Norway
| | - John-Helge Heimdal
- Department of Otolaryngology and Head and Neck Surgery, Haukeland University Hospital, Bergen, Norway.,Department of Surgery, Haukeland University Hospital, Bergen, Norway.,Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Tom Karlsen
- Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway
| | - Magnus Hilland
- Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway
| | - Zoe Fretheim-Kelly
- Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway.,Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | | | - Astrid Sandnes
- Department of Internal Medicine, Innlandet Hospital Trust, Gjøvik, Norway
| | - Sigrun Hjelle
- Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway
| | - Maria Vollsæter
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway
| | - Thomas Halvorsen
- Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Pediatric and Adolescent Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway
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Fretheim-Kelly Z, Fjordbakk CT, Fintl C, Krontveit R, Strand E. A bitless bridle does not limit or prevent dynamic laryngeal collapse. Equine Vet J 2020; 53:44-50. [PMID: 32449540 DOI: 10.1111/evj.13287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 04/17/2020] [Accepted: 05/09/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Bits have often been incriminated as a cause of upper respiratory tract obstruction in horses; however, no scientific studies are available to confirm or refute these allegations. Clinical signs of dynamic laryngeal collapse associated with poll flexion (DLC) are induced when susceptible horses are ridden or driven into the bit. OBJECTIVE To determine whether use of Dr Cook's™ Bitless Bridle, instead of a conventional snaffle bit bridle, would reduce the severity of DLC in affected horses measured objectively using inspiratory tracheal pressures. STUDY DESIGN Intervention study using each horse as its own control in a block randomised order. METHODS Nine Norwegian Swedish Coldblooded trotters previously diagnosed with DLC were exercised on two consecutive days using a standardised high-speed treadmill protocol with either a conventional bridle with a snaffle bit, or Dr Cook's™ Bitless Bridle. Head and neck position, rein tension, inspiratory tracheal pressure measurements, and laryngeal videoendoscopy recordings were obtained. A heart rate greater than 200 bpm, and similar degrees of poll flexion/head height, had to be achieved in both bridles for the individual horse's data to be included for comparison. RESULTS Seven horses' data met the inclusion criteria. The change in mean inspiratory tracheal pressure between free and flexion phases in the bitless bridle (-15.2 ± 12.3 cmH2 O) was significantly greater (P < .001) than in the snaffle bit bridle (-9.8 ± 7.9 cmH2 O). Mean inspiratory pressure during the free phase was significantly (P < .001) more negative with the snaffle bit bridle (-32.3 ± 6.3 cmH2 O), vs the bitless bridle (-28.5 ± 6.9 cmH2 O). Mean pressures in flexion phase, snaffle bridle (-42.1 ± 10.8 cmH2 O), vs bitless bridle (-43.7 ± 15.6 cmH2 O) where not significantly different between bridles (P = .2). MAIN LIMITATION Small sample size due to difficulty recruiting suitable clinical cases. CONCLUSIONS This study could not provide any clear evidence that the effect of a snaffle bit in a horse's mouth influences the development or severity of DLC. Instead, head and neck angles induced by rein tension seem to be the key event in provoking DLC in susceptible horses.
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Affiliation(s)
- Zoe Fretheim-Kelly
- Faculty of Veterinary Medicine, Companion Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway.,Haukeland University Hospital, Bergen, Norway
| | - Cathrine T Fjordbakk
- Faculty of Veterinary Medicine, Companion Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Constanze Fintl
- Faculty of Veterinary Medicine, Companion Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | | | - Eric Strand
- Faculty of Veterinary Medicine, Companion Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
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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; 129:2748-2753. [PMID: 30698834 PMCID: PMC6900056 DOI: 10.1002/lary.27846] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/07/2019] [Accepted: 01/10/2019] [Indexed: 02/06/2023]
Abstract
Objectives/Hypothesis To determine if simultaneous tracheal and supraglottic pressure measurement performed during a continuous laryngoscopy exercise (CLE) test is possible, tolerable, and feasible, and if so, whether measurements can be used to determined airflow resistance over the larynx, thus providing an objective outcome measure for the CLE test, the gold standard for diagnosing exercise‐induced laryngeal obstruction. Study Design Explorative descriptive clinical study. Methods A CLE test was performed with the addition of two pressure sensors (Mikro‐Cath 825‐0101; Millar, Houston, TX) placed at the epiglottic tip and at the fifth tracheal ring. To place sensors, laryngeal anesthesia and a channel scope were required. Tolerability and feasibility was determined by a Likert score and subjective indication from subjects and operators. Adjustments to the technique were made to increase tolerability. The pressure data were continuously collected and analyzed for artifacts, drifts, frequency response, and used with flow data to calculate translaryngeal resistance. Results All subjects (n = 7) completed all procedures. Two main areas of concern were identified regarding tolerability: application of topical anesthesia to the larynx and nasal discomfort due to the added diameter of the laryngoscope. Protocol adjustments improved both. Pressure data were obtained from all procedures in all subjects, were consistent, and followed physiological trends. Conclusions Continuous measurement of the translaryngeal pressure gradient during a CLE test is possible, feasible, and tolerable. A CLE test with direct measurement of the translaryngeal pressure gradient might become a valuable tool in the objective assessment of respiratory function, and normal values should be established in health and disease. Level of Evidence NA Laryngoscope, 129:2748–2753, 2019
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Affiliation(s)
- Zoe Fretheim-Kelly
- Faculty of Veterinary Science, Norwegian University of Life Sciences, Oslo, Norway.,Pediatric Department, Haukeland University Hospital, Bergen, Norway
| | - Thomas Halvorsen
- Pediatric Department, Haukeland University Hospital, Bergen, Norway.,Department of Clinical Science, University of Bergen, Bergen, Norway
| | | | - Eric Strand
- Faculty of Veterinary Science, Norwegian University of Life Sciences, Oslo, Norway
| | - Maria Vollsaeter
- Pediatric Department, Haukeland University Hospital, Bergen, Norway
| | - Hege Clemm
- Pediatric Department, Haukeland University Hospital, Bergen, Norway
| | - Ola Roksund
- Pediatric Department, Haukeland University Hospital, Bergen, Norway
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