Speaker's Highlight

• Don Sin University of British Columbia, St. Paul Hospital (Canada)
  Kenneth R. Chapman Toronto General Hospital Research Institute (Canada)
• Parameswaran Nair McMaster University (Canada)
  Carolyn Calfee UCSF (U.S.A.)
• Gregory P. Downey University of Colorado School of Medicine (U.S.A.)
  David A. Schwartz University of Colorado School of Medicine (U.S.A.)
• Neil Schluger Tuberculosis Control Branch, California Department of Public Health (U.S.A.)
  Nick Kim Critical Care & Sleep Medicine, University of California San Diego (U.S.A.)
• Nicola Hananiah Baylor College of Medicine (U.S.A.)
  Jae-Joon Yim Seoul National University College of Medicine (Republic of Korea)
• Koichiro Asano Tokai University School of Medicine (Japan)
  Diahn-Warng Perng Taipei Veterans General Hospital (Taiwan)
• Konstantinos Kostikas University of Ioannina (Greece)
  Karin Klooster University Medical Center Groningen (Kingdom of the Netherlands)

• Non-Invasive Ventilation in Chronic Respiratory Failure

  Chronic respiratory failure develops when the lungs cannot maintain adequate oxygenation, ventilation, or both over an extended period. The condition may arise from advanced chronic obstructive pulmonary disease (COPD), neuromuscular weakness, obesity hypoventilation syndrome, chest wall disorders, or severe sleep-related breathing abnormalities. For many patients, non-invasive ventilation (NIV) has become an important component of long-term respiratory care.

  NIV supports breathing through a mask rather than an invasive airway. By improving alveolar ventilation and reducing the work of breathing, it can help control carbon dioxide retention, relieve respiratory muscle fatigue, and improve sleep quality. Its role is especially relevant to respiratory specialists, allied health professionals, and clinical teams attending an APSR and KATRD-connected medical congress.

  Effective treatment requires more than selecting a pressure setting. Patient selection, disease mechanism, interface choice, adherence, monitoring, and education all influence outcomes. Long-term ventilatory support should therefore be integrated into a broader plan that includes medication review, pulmonary rehabilitation, nutritional care, vaccination, oxygen assessment, and management of comorbidities.

  Clinical Role Of Long-Term Ventilatory Support

  NIV assists inspiration by delivering positive airway pressure through a nasal, oronasal, or full-face interface. Bilevel systems provide separate inspiratory and expiratory pressures, while volume-assured modes adjust pressure support to target a preset ventilation level. Continuous positive airway pressure (CPAP) may be appropriate when upper-airway obstruction is the main problem, but it does not provide the same ventilatory assistance as bilevel therapy.

  The principal physiological goals are to increase effective minute ventilation, reduce nocturnal hypoventilation, unload the respiratory muscles, and improve gas exchange. In selected patients, these changes may reduce morning headaches, daytime somnolence, exertional limitation, and recurrent admissions. NIV is generally most useful when clinicians identify a persistent ventilatory problem that can be addressed with adequate support and sustained use.

  Identifying Suitable Patients

  Assessment begins with the cause and pattern of respiratory failure. Symptoms such as orthopnea, disturbed sleep, fatigue, morning headache, impaired concentration, and recurrent exacerbations can indicate nocturnal hypoventilation. Arterial or venous blood gases, serum bicarbonate, overnight oximetry, transcutaneous carbon dioxide monitoring, pulmonary function testing, and sleep studies may all contribute to the evaluation.

  In COPD, home NIV is commonly considered after an acute hypercapnic episode when daytime carbon dioxide elevation persists following stabilization. Patients with obesity hypoventilation syndrome may require positive airway pressure alongside weight-management care, while individuals with motor neuron disease or other neuromuscular conditions may benefit as respiratory muscle weakness progresses. The decision should reflect symptoms, blood gas findings, disease trajectory, cognitive status, secretion clearance, and the person’s ability to use the equipment.

  Selecting The Right Mode And Interface

  A successful setup balances physiological effectiveness with comfort. Bilevel positive airway pressure can offer pressure support for hypoventilation, whereas spontaneous-timed modes may provide a backup respiratory rate when the patient has unreliable respiratory effort. Volume-targeted pressure support can be useful in selected cases, but clinicians should understand how the device responds to leaks, changing respiratory mechanics, and altered patient effort.

  Clinical situation	Common support approach	Main objective	Important considerations
  COPD with persistent hypercapnia	High-support bilevel NIV, often with a backup rate	Reduce carbon dioxide and respiratory muscle load	Confirm stability, assess adherence, monitor leaks and gas exchange
  Obesity hypoventilation syndrome	CPAP or bilevel NIV according to obstruction and hypoventilation	Correct sleep-disordered breathing and daytime ventilatory failure	Address weight, oxygen needs, and obstructive sleep apnea
  Neuromuscular weakness	Bilevel NIV with backup support when needed	Maintain ventilation and reduce fatigue	Plan secretion management, cough assistance, and progression review
  Chest wall restriction	Bilevel pressure support	Improve ventilation and sleep quality	Evaluate posture, restrictive mechanics, and interface tolerance
  Predominantly obstructive sleep apnea	CPAP in appropriate patients	Prevent upper-airway collapse	Escalate to NIV if hypoventilation persists or another indication emerges

  The interface is equally important. Nasal masks may be comfortable for some users, while oronasal masks can be preferable for mouth breathing or higher support levels. Mask fitting should account for facial structure, pressure injury risk, claustrophobia, and the need to speak or clear secretions. Heated humidification, gradual acclimatization, and practical coaching can make regular use more achievable.

  Applying NIV Across Respiratory Diseases

  For COPD, the clinical objective is usually control of chronic or recurrent hypercapnia rather than correction of oxygen saturation alone. NIV should complement optimized inhaled treatment, smoking cessation support, rehabilitation, and early action plans for exacerbations. A careful reassessment after an acute admission helps distinguish persistent chronic ventilatory failure from temporary carbon dioxide elevation during an exacerbation.

  Patients with neuromuscular disease often need a proactive pathway because respiratory decline can be gradual and difficult to recognize. Serial forced vital capacity, sniff nasal inspiratory pressure, cough effectiveness, nocturnal symptoms, and carbon dioxide measurements can help identify the appropriate time to begin support. NIV may also be combined with mechanical insufflation-exsufflation or other airway-clearance techniques when cough strength is reduced.

  In obesity hypoventilation syndrome, treating sleep-related upper-airway obstruction is important, but CPAP alone may not correct sustained hypoventilation in every patient. Bilevel support may be required when hypercapnia continues, when CPAP is poorly tolerated, or when respiratory mechanics and sleep-disordered breathing create a more complex clinical picture. Weight reduction remains a central part of long-term management.

  Monitoring Effectiveness And Safety

  Follow-up should assess both clinical response and objective ventilation. Useful measures include daytime symptoms, sleep quality, device-generated usage data, unintentional leak, overnight oxygenation, transcutaneous or end-tidal carbon dioxide, and repeat blood gases when clinically indicated. A fall in carbon dioxide, improved alertness, and fewer exacerbations may suggest benefit, although each patient requires individualized targets.

  Common problems include nasal congestion, dry mouth, skin breakdown, aerophagia, eye irritation, anxiety, and intolerance of pressure. Mask refitting, humidification, pressure adjustment, and behavioral support can often resolve these barriers. Persistent leaks may reduce delivered support and compromise monitoring accuracy. Clinicians should also review oxygen prescriptions carefully, since excessive supplemental oxygen in patients prone to hypoventilation can worsen carbon dioxide retention.

  Practical Steps For Better Home NIV

  A coordinated service can improve initiation and long-term adherence. Respiratory nurses, physiotherapists, sleep specialists, physicians, home-care providers, and caregivers each have a role in making treatment workable outside the hospital.

  • Confirm the underlying cause of respiratory failure before choosing the device or mode.
  • Establish baseline symptoms, gas exchange, lung function, sleep findings, and functional status.
  • Fit the interface carefully and provide supervised acclimatization before home use.
  • Teach patients and caregivers troubleshooting, cleaning, skin care, and signs that require urgent review.
  • Schedule early follow-up to examine adherence, leaks, comfort, ventilation, and changing clinical needs.

  Education should be repeated rather than delivered only at initiation. Patients need to understand why NIV has been prescribed, how regular use affects effectiveness, and when worsening breathlessness, confusion, infection, or secretion retention warrants prompt medical attention. Remote monitoring may support follow-up, but device data should be interpreted alongside symptoms and clinical findings.

  Respiratory medicine continues to refine how home ventilatory support is prescribed, monitored, and integrated with multidisciplinary care. Explore the APSR 2022 congress program, committee expertise, and invited-speaker perspectives to deepen understanding of chronic respiratory failure and advance patient-centered NIV practice.

  Richard Russell Nuffield Department of Clinical Medicine, University of Oxford (United Kingdom)
• Mona Bafadhel King’s College London (United Kingdom)
  David Jackson Guy’s and St Thomas’ Hospital, King’s College London (United Kingdom)
• James Chalmers University of Dundee (United Kingdom)
  David Price University of Aberdeen (United Kingdom)