title: Nocturnal nasal congestion and nasal resistance.
abstract: OBJECTIVE
  To compare total nasal resistance (TNR) in upright and supine positions in patients who did and did not complain of nocturnal (supine) nasal congestion symptoms without daytime (upright) congestion, and to determine what other conditions were associated with nocturnal nasal congestion (NNC) symptoms.
  
  
  METHODS
  A prospective study comparing objectively measured nasal airflow in different positions (upright and reclining) with subjective patient symptoms.
  
  
  METHODS
  Subjects completed a questionnaire about nasal symptoms. Anterior rhinomanometry was performed with patients upright, reclined 45 degrees, and supine. TNR in subject subsets was compared using the Student t test.
  
  
  RESULTS
  TNR did not differ between upright patients with (n = 27) and without (n = 20) NNC. Supine TNR (P < .04) and increase in TNR (P < .02) between upright and supine was greater in patients with NNC. Smokers (n = 15, 10 with NNC, 5 without) had greater TNR increases when supine versus nonsmokers (P < .02). Patients with rhinitis symptoms (n = 29, 18 with NNC, 11 without) had greater TNR increases when supine than patients without rhinitis (P < .01). Patients who both smoked and had rhinitis (n = 11, 7 with NNC, 4 without) had a greater supine TNR than patients who smoked or had rhinitis alone (P < .02).
  
  
  CONCLUSIONS
  Some patients without daytime nasal congestion experience NNC. They have a significantly greater TNR increase when supine versus patients without NNC. Smokers and patients with rhinitis, with or without NNC, have a significantly greater TNR increase when supine versus nonsmokers or patients without rhinitis. Smoking cessation and treatment of rhinitis may improve the patients' NNC.
authors.affiliation: Department of Otolaryngology, University of Texas Medical Branch, Galveston 77555, USA.
authors.forename: R H
authors.initials: RH
authors.lastname: Stroud
authors.forename: S T
authors.initials: ST
authors.lastname: Wright
authors.forename: K H
authors.initials: KH
authors.lastname: Calhoun
mesh_terms: D000403:Airway Resistance / Q000502:physiology*; D016022:Case-Control Studies; D006801:Humans; D008365:Manometry; D009297:Nasal Mucosa / Q000098:blood supply* / Q000503:physiopathology; D015508:Nasal Obstruction / Q000175:diagnosis / Q000503:physiopathology*; D011187:Posture / Q000502:physiology; D011446:Prospective Studies; D012220:Rhinitis / Q000503:physiopathology; D012907:Smoking / Q000503:physiopathology