Nasal-cardiopulmonary reflexes: a role of the larynx.

A brief review of the literature from otorhinolaryngology and the basic sciences shows the existence and role of nasal-cardiopulmonary reflexes in animals and man. There is ample evidence that odors, fluids and mechanical stiumlation of the nasal mucosa will induce changes in the lungs and cardiovascular system. The proposition that nasal obstruction also produces cardiopulmonary changes is briefly reviewed. The suggestion is made that one of the functions of the nose is to act as an expiratory brake. the removal of this brake could result in changes in laryngeal resistance that lead to poor ventilation.