Publications
Academic article
- Anne Kristine Brekka; Petrine Veierød Solli; Solfrid Indrekvam et al. (2026). Laryngeal Responses During Non-Invasive Ventilation in Stable Chronic Obstructive Pulmonary Disease: An Observational Study. (external link)
- Lorentz Sandvik; Sivert Helland Veseth; Haakon Kristian Kvidaland et al. (2026). Exercise-Induced Laryngeal Obstruction: A Randomized Controlled Trial of Surgical Treatment. (external link)
- Anne Kristine Brekka; Maria Vollsæter; Zoe Fretheim-Kelly et al. (2025). Exploring upper airway and laryngeal resistance to noninvasive ventilation in healthy awake adults. (external link)
- Kristine Vreim; Tom Karlsen; Petter Carlsen et al. (2025). Speech therapy for exercise-induced laryngeal obstruction. (external link)
- Tiina Maarit Andersen; Anne Kristine Brekka; Zoe Fretheim-Kelly et al. (2025). Upper Airway and Translaryngeal Resistance During Mechanical Insufflation-Exsufflation. (external link)
- Tom Hemming Karlsen; Kristine Vreim; Ola Drange Røksund et al. (2024). A speech therapy treatment protocol for exercise induced laryngeal obstruction. (external link)
- Ida Jansrud; Thomas Halvorsen; Maria Vollsæter et al. (2022). Conundrums in the breathless athlete; exercise-induced laryngeal obstruction or asthma?. (external link)
- Zoe Fretheim-Kelly; Mette Engan; Hege Synnøve Havstad Clemm et al. (2022). Reliability of translaryngeal airway resistance measurements during maximal exercise. (external link)
- Hege Synnøve Havstad Clemm; Ola Drange Røksund; Tiina Maarit Andersen et al. (2022). Exercise-induced Laryngeal Obstruction: Protocol for a Randomized Controlled Treatment Trial. (external link)
- Astrid Sandnes; Tiina Maarit Andersen; Hege Synnøve Havstad Clemm et al. (2021). Clinical responses following inspiratory muscle training in exercise-induced laryngeal obstruction. (external link)
- Erling Johan Setså; Øyvind Sverre Svendsen; Paul Husby et al. (2020). An experimental study on intraoperative recovery of recurrent laryngeal nerve function. (external link)
- Zoe Fretheim-Kelly; Thomas Halvorsen; John-Helge Heimdal et al. (2019). Feasibility and tolerability of measuring translaryngeal pressure during exercise. (external link)
- Astrid Sandnes; Tiina Maarit Andersen; Hege Synnøve Havstad Clemm et al. (2019). Exercise-induced laryngeal obstruction in athletes treated with inspiratory muscle training. (external link)
- Astrid Sandnes; Magnus Hilland; Maria Vollsæter et al. (2019). Severe exercise-induced laryngeal obstruction treated with supraglottoplasty. (external link)
- Tiina Maarit Andersen; Thomas Halvorsen; Ove Fondenes et al. (2019). Larynx: The Complex Gateway to the Lungs. (external link)
- Solbjørg Makalani Myrtveit Sæther; Torhild Heggestad; John-Helge Heimdal et al. (2019). Long Waiting Times for Elective Hospital Care – Breaking the Vicious Circle by Abandoning Prioritisation. (external link)
- Geir Olav Dahle; Erling Johan Setså; Øyvind Sverre Svendsen et al. (2019). Vocal Cord Function During Recurrent Laryngeal Nerve Injury Assessed by Accelerometry and EMG. (external link)
- Hege Synnøve Havstad Clemm; Astrid Sandnes; Maria Vollsæter et al. (2018). The Heterogeneity of Exercise-induced Laryngeal Obstruction.. (external link)
- Tiina Maarit Andersen; Astrid Sandnes; Ove Fondenes et al. (2018). Laryngeal responses to mechanically assisted cough in progressing amyotrophic lateral sclerosis. (external link)
- Tom Karlsen; Lorentz Sandvik; John-Helge Heimdal et al. (2018). Acoustic voice analysis and maximum phonation time in relation to voice handicap index score and larynx disease. (external link)
- Thomas Halvorsen; Emil Schwarz Walsted; Caterina Bucca et al. (2017). Inducible laryngeal obstruction: An official joint European Respiratory Society and European Laryngological Society statement. (external link)
- Tom Karlsen; Lorentz Sandvik; John-Helge Heimdal et al. (2017). Health-related Quality of Life as Studied by EORTC QLQ and Voice Handicap Index Among Various Patients With Laryngeal Disease. (external link)
- Ola Drange Røksund; John-Helge Heimdal; Hege Synnøve Havstad Clemm et al. (2016). Exercise inducible laryngeal obstruction: diagnostics and management. (external link)
- Katrin Brauckhoff; Renate Kollevåg Vik; Lorentz Sandvik et al. (2016). Impact of EMG changes in continuous vagal nerve monitoring in high-risk endocrine neck surgery. (external link)
- Tiina Maarit Andersen; Astrid Sandnes; Anne Kristine Brekka et al. (2016). Laryngeal response patterns influence the efficacy of mechanical assisted cough in amyotrophic lateral sclerosis. (external link)
- Hans Jørgen Aarstad; Helene Hersvik Aarstad; Olav Karsten Vintermyr et al. (2016). In vitro monocyte IL-6 secretion levels following stimulation with autologous spheroids derived from tumor or benign mucosa predict long-term survival in head and neck squamous cell carcinoma patients. (external link)
- Magnus Hilland; Ola Drange Røksund; Lorentz Sandvik et al. (2016). Congenital laryngomalacia is related to exerciseinduced laryngeal obstruction in adolescence. (external link)
- Hans Jørgen Aarstad; Olav Karsten Vintermyr; Elling Ulvestad et al. (2015). Peripheral blood monocyte and T-lymphocyte activation levels at diagnosis predict long-term survival in head and neck squamous cell carcinoma patients. (external link)
- Katrin Brauckhoff; Renate Kollevåg Vik; Lorentz Sandvik et al. (2015). Impact of EMG Changes in Continuous Vagal Nerve Monitoring in High-Risk Endocrine Neck Surgery. (external link)
- Helene Hersvik Aarstad; Olav Karsten Vintermyr; Elling Ulvestad et al. (2015). In vitro-stimulated IL-6 monocyte secretion and in vivo peripheral blood T lymphocyte activation uniquely predicted 15-year survival in patients with head and neck squamous cell carcinoma. (external link)
- Tom Karlsen; John-Helge Heimdal; Anne Rita Helle Grieg et al. (2015). The Norwegian Voice Handicap Index (VHI-N) patient scores are dependent on voice-related disease group. (external link)
- Katarina Norlander; Pernille M. Christensen; Robert Maat et al. (2015). Comparison between two assessment methods for exercise-induced laryngeal obstructions. (external link)
- Ola Drange Røksund; John-Helge Heimdal; Jan Olofsson et al. (2014). Larynx during exercise: the unexplored bottleneck of the airways. (external link)
- Camilla Sofie Aaby; John-Helge Heimdal (2013). The voice-related quality of life (V-RQOL) measure-a study on validity and reliability of the Norwegian version. (external link)
- Tom Karlsen; Anne Rita Hella Grieg; John-Helge Heimdal et al. (2013). Cross-cultural adaption and translation of the voice handicap index into Norwegian. (external link)
- Tiina Maarit Andersen; Astrid Sandnes; Magnus Hilland et al. (2013). Laryngeal response patterns to mechanical insufflation-exsufflation in healthy subjects. (external link)
- Astrid Sandnes; Tiina Maarit Andersen; Magnus Hilland et al. (2013). Laryngeal movements during inspiratory muscle training in healthy subjects. (external link)
- Tom Karlsen; Anne Rita Helle Grieg; John-Helge Heimdal et al. (2012). Cross-cultural adaption and translation of the voice handicap index into Norwegian. (external link)
- Robert Maat; Magnus Hilland; Ola Drange Røksund et al. (2011). Exercise-induced laryngeal obstruction: natural history and effect of surgical treatment. (external link)
- Ola Drange Røksund; Hege Synnøve Havstad; John-Helge Heimdal et al. (2010). Left vocal cord paralysis after extreme preterm birth, a new clinical scenario in adults. (external link)
- Robert Maat; Ola Drange Røksund; Thomas Halvorsen et al. (2009). Audiovisual assessment of exercise-induced laryngeal obstruction: reliability and validity of observations. (external link)
- Ola Drange Røksund; Robert Maat; John-Helge Heimdal et al. (2009). Exercise induced dyspnea in the young. Larynx as the bottleneck of the airways. (external link)
- John-Helge Heimdal; Kenneth Wilfried Kross; Beate Klementsen et al. (2008). Stimulated monocyte IL-6 secretion predicts survival of patients with head and neck squamous cell carcinoma. (external link)
- Kenneth Wilfried Kross; John-Helge Heimdal; Carla Olsnes et al. (2008). Co-culture of head and neck squamous cell carcinoma spheroids with autologous monocytes predicts prognosis. (external link)
- Kenneth Wilfried Kross; John-Helge Heimdal; Carla Olsnes et al. (2007). Tumour-associated macrophages secrete IL-6 and MCP-1 in head and neck squamous cell carcinoma tissue. (external link)
- John-Helge Heimdal; Ola Drange Røksund; Thomas Halvorsen et al. (2007). Continuous Laryngoscopy Exercise Test: A Method for Visualizing Laryngeal Dysfunction During Exercise (Letter). (external link)
- Robert Maat; Ola Drange Røksund; Jan Olofsson et al. (2007). Surgical treatment of exercise-induced laryngeal dysfunction. (external link)
- John-Helge Heimdal; Ola Drange Røksund; Thomas Halvorsen et al. (2006). Continuous laryngoscopy exercise test: a method for visualizing laryngeal dysfunction during exercise. (external link)
- Hans Jørgen Aarstad; John-Helge Heimdal; Beate Klementsen et al. (2006). Presence of activated T lymphocytes in peripheral blood of head and neck squamous cell carcinoma patients predicts impaired prognosis. (external link)
- Hans Jørgen Aarstad; John-Helge Heimdal; Jan Olofsson et al. (2005). Mood, anxiety and sense of humor in head and neck cancer patients in relation to disease stage, prognosis and quality of life. (external link)
- Kenneth Wilfried Kross; John-Helge Heimdal; Carla Olsnes et al. (2005). Head and neck squamous cell carcinoma spheroid- and monocyte spheroid-stimulated IL-6 and monocyte chemotactic protein-1 secretion are related to TNM stage, inflammatory state and tumor macrophage density. (external link)
- Carla Olsnes; John-Helge Heimdal; Kenneth Wilfried Kross et al. (2005). Viable head and neck tumor spheroids stimulate in vitro autologous monocyte MCP-1 secretion through soluble substances and CD14/lectin-like receptors. (external link)
Academic literature review
- Zoe Louise Fretheim-Kelly; Thomas Halvorsen; Hege Synnøve Havstad Clemm et al. (2019). Exercise induced laryngeal obstructions in humans and equines. A comparative review. (external link)
- John-Helge Heimdal; Robert Maat; Leif Nordang (2018). Surgical intervention for exercise-induced laryngeal obstruction. (external link)
- Pernille M. Christensen; John-Helge Heimdal; Kent L. Christopher et al. (2015). ERS/ELS/ACCP 2013 international consensus conference nomenclature on inducible laryngeal obstructions. (external link)
- John-Helge Heimdal; Thomas Halvorsen; Robert Maat et al. (2011). Exercise Induced Laryngeal Obstruction (EILO): Diagnosis and Management. (external link)
- Kenneth Wilfried Kross; John-Helge Heimdal; Hans Jørgen Aarstad (2010). Mononuclear phagocytes in head and neck squamous cell carcinoma. (external link)
Conference lecture
- John-Helge Heimdal; Magnus Hilland (2013). Instructional Course " A method for visualising laryngeal obstruction during exercise". (external link)
- John-Helge Heimdal (2012). Inducible Laryngeal obstructions. (external link)
- John-Helge Heimdal (2012). Various faces of laryngeal spasm. (external link)
- Anne Kari Hersvik Aarstad; Hans Jørgen Aarstad; John-Helge Heimdal et al. (2004). Personality and quality of life in relation to quantity of treatment in patients With HNSCC.. (external link)
Conference poster
- Tiina Andersen; Anne Kristine Brekka; Zoe Fretheim-Kelly et al. (2024). Upper airway and translaryngeal resistance during mechanical insufflation-exsufflation. (external link)
- Tiina Maarit Andersen; Astrid Sandnes; Anne Kristine Brekka et al. (2015). Laryngeal response patterns to mechanical assisted cough in Amyotrophic Lateral Sclerosis.. (external link)
- Tiina Maarit Andersen; Astrid Sandnes; Anne Kristine Brekka et al. (2015). Laryngeal response patterns to mechanical insufflation-exsufflation in amyotrophic lateral sclerosis.. (external link)
- Carolina Campos; Ola Drange Røksund; Maria Vollsæter et al. (2014). Exercise induced inspiratory symptoms. (external link)
- Maria Vollsæter; Hege Synnøve Havstad Clemm; John-Helge Heimdal et al. (2014). Spirometry- a tool for diagnosing exercise induced laryngeal obstruction (EILO)?. (external link)
- Hege Synnøve Havstad Clemm; Maria Vollsæter; Magnus Hilland et al. (2014). Exercise induced laryngeal obstruction(EILO)diagnosed with laryngoscopy during rest or during exercise?. (external link)
- Maria Vollsæter; Hege Synnøve Havstad Clemm; John-Helge Heimdal et al. (2014). Exercise Induced Inspiratory Stridor (EIIS) - A growing Challenge during Physical activity. (external link)
- Hege Synnøve Havstad Clemm; Maria Vollsæter; Ola Drange Røksund et al. (2014). Exercise induced inspiratory stridor (EIIS) in athletes. (external link)
Doctoral thesis (PhD)
- Zoe Fretheim-Kelly; Eric Strand; Constanze Fintl et al. (2021). From horses to humans : a comparative study developing the first protocol for measuring upper airway pressures in exercising humans. (external link)
- Tiina Maarit Andersen; Ola Drange Røksund; Thomas Halvorsen et al. (2018). Laryngeal response patterns during mechanically assisted cough in Amyotrophic Lateral Sclerosis. (external link)
- Robert Maat; Jan Olofsson; John-Helge Heimdal (2011). Exercise-induced laryngeal obstruction. Diagnostic procedures and therapy. (external link)
Letter to the editor
- Tiina Maarit Andersen; Astrid Sandnes; Ove Fondenes et al. (2018). Laryngoscopy Can Be a Valuable Tool for Unexpected Therapeutic Response in Noninvasive Respiratory Interventions.. (external link)
- Thomas Halvorsen; O.D. Røksund; John-Helge Heimdal et al. (2011). Larynx in exercising humans; the unexplored bottleneck of the airways (Letter). (external link)
- Thomas Halvorsen; Ola Drange Røksund; Robert Maat et al. (2011). Use of Post-Exercise Laryngoscopy to Evaluate Exercise Induced Dyspnea (Letter). (external link)