The upper airways. II. The larynx and trachea

Area of Science:

• Respiratory Medicine
• Otolaryngology
• Pulmonary Physiology

Background:

• The laryngotracheal airway is a critical, narrow passage in the respiratory system.
• Diseases affecting the nasal passage or bronchial airways have limited impact, unlike those of the laryngotracheal region, which are life-threatening.
• The nasal airway normally conditions inhaled air before it reaches the lungs, a function vital for lower airway health.

Purpose of the Study:

• To highlight the critical role of the nasal airway in respiratory health.
• To discuss the detrimental effects of bypassing the nasal airway on pulmonary function.
• To emphasize the need for improved understanding and methods for air conditioning when the natural nasal pathway is compromised.

Main Methods:

• Review of physiological functions of the upper airway.
• Analysis of the consequences of nasal airway bypass (e.g., intubation, tracheostomy).
• Evaluation of current air humidification techniques and their limitations.

Main Results:

• Impaired nasal function places an increased burden on lower airways, potentially contributing to small airway disease.
• Acute (orotracheal intubation) and chronic (tracheostomy, laryngectomy) bypass of the nose negatively impact pulmonary airways.
• Current methods for substituting nasal air conditioning are hazardous and of questionable efficacy.

Conclusions:

• A comprehensive understanding of upper airway function is essential for managing respiratory conditions.
• Malfunction or bypass of the upper airway necessitates effective air conditioning strategies.
• Further research is needed to develop safer and more efficacious methods for conditioning air delivered directly to the trachea.