Funding sources for the study: National Institutes of Health (National Center for Research Resources [NCRR] and the National Center for Advancing Translational Sciences [NCATS], KL2 RR025015 to G.E.D.; National Institute on Deafness and Other Communication Disorders [NIDCD], RO1 DC004156 to D.R.S. and NIDCD, T32 DC000018-27 to J.J.L.; National Center for Research Resources [NCRR], NCRR, TL1 RR025016 to A.S.H.).
Nasal saline irrigation has no effect on normal olfaction: a prospective randomized trial
Article first published online: 4 NOV 2013
© 2013 ARS-AAOA, LLC
International Forum of Allergy & Rhinology
Volume 4, Issue 1, pages 39–42, January 2014
How to Cite
How to Cite this Article: Nasal saline irrigation has no effect on normal olfaction: a prospective randomized trial. Int Forum Allergy Rhinol. 2014;4:39-42., , , , .
Potential conflict of interest: None provided.
- Issue published online: 2 JAN 2014
- Article first published online: 4 NOV 2013
- Manuscript Accepted: 26 JUL 2013
- Manuscript Revised: 26 JUN 2013
- Manuscript Received: 5 MAY 2013
- National Center for Research Resources [NCRR] and the National Center for Advancing Translational Sciences [NCATS]. Grant Number: KL2 RR025015 to G.E.D.
- National Institute on Deafness and Other Communication Disorders [NIDCD]. Grant Numbers: RO1 DC004156 to D.R.S., NIDCD, T32 DC000018-27 to J.J.L.
- National Center for Research Resources [NCRR], NCRR. Grant Number: TL1 RR025016 to A.S.H.
- nasal cell harvesting;
- nasal curette;
- nasal cytobrush;
- olfactory cilia;
- saline irrigation
Nasal saline irrigation is a safe treatment for chronic rhinosinusitis; however, its effect on olfaction is unclear. Cyclic adenosine monophosphate (cAMP) is a key second messenger in the mechanism of olfaction and has been shown to be associated with smell function. In animal studies, olfactory cilia may be harvested by simple saline preparations. This study aimed to characterize the effect of nasal saline irrigation on smell function.
Volunteers with normal olfaction were randomized into a control or irrigation cohort. In the initial appointment, subjects completed a University of Pennsylvania Smell Identification Test (UPSIT) and nasal samples were obtained by 2 methods: the nasal curette and cytobrush. The irrigation cohort performed daily nasal saline irrigations. Both cohorts then returned in 1 week. The UPSIT and nasal cell collection were repeated, and each subject completed a subjective olfactory transition scale. Nasal samples were processed for cAMP levels using a commercial assay.
Thirty-two subjects were enrolled and randomized into each cohort. Control and postirrigation mean UPSIT scores were 36.8 and 36.7 (p = 0.48). No subjects reported a subjective smell loss. Ten pairs of nasal samples were assayed. Using the curette, control and postirrigation cAMP levels were 509 and 490 fmol/(mg/mL), respectively (p = 0.94). Using the cytobrush, respective cAMP levels were 424 and 449 fmol/(mg/mL), respectively (p = 0.94).
Nasal saline irrigation has no subjective or objective effect on olfaction. It also does not appear to affect cAMP levels, a potential marker of smell function.