title: The effect of esophageal pressure monitoring on nasal airway resistance.
abstract: OBJECTIVE
  Artificial obstruction of nasal airflow has been shown to increase the amount of apneas and arousals. An esophageal catheter inserted through the nasal cavity is used in sleep studies to show intrathoracic pressure variations as sign of obstructive apneas and increased respiratory resistance. This study evaluates the effect of transnasal esophageal catheter on nasal airflow.
  
  
  METHODS
  Fifty patients with problem snoring referred to our ENT clinic underwent overnight limited sleep study with an esophageal catheter. Nasal airway resistance was measured the following morning with active anterior rhinomanometry. After exclusion of 17 measurements, the results of 33 patients were compared with same parameters obtained earlier without nasal manipulation.
  
  
  CONCLUSIONS
  The ipsilateral nasal resistance was clearly elevated when measured with a catheter used overnight compared with the control measurement (P < 0.05). However, the combined nasal resistance was not significantly increased in this material with patent nasal airways. In patients with already compromised nasal airflow, the possibility of clinically relevant changes in nasal airflow during catheter use should be taken in account.
authors.affiliation: Department of Otolaryngology, Helsinki University Central Hospital, Finland. paul.virkkula@huch.fi
authors.forename: P
authors.initials: P
authors.lastname: Virkkula
authors.forename: J
authors.initials: J
authors.lastname: Silvola
authors.forename: H
authors.initials: H
authors.lastname: Lehtonen
authors.forename: T
authors.initials: T
authors.lastname: Salmi
authors.forename: H
authors.initials: H
authors.lastname: Malmberg
mesh_terms: D000328:Adult; D000368:Aged; D000403:Airway Resistance; D002406:Catheterization, Peripheral; D004947:Esophagus / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D009666:Nose / Q000502:physiology*