Nasal saline irrigation has no effect on normal olfaction: a prospective randomized trial

Area of Science:

• Otolaryngology
• Neuroscience
• Physiology

Background:

• Nasal saline irrigation is a common treatment for chronic rhinosinusitis, but its effects on olfaction remain unclear.
• Cyclic adenosine monophosphate (cAMP) plays a crucial role in olfactory mechanisms and is linked to smell function.
• Previous animal studies suggest olfactory cilia can be affected by saline preparations.

Purpose of the Study:

• To investigate the impact of nasal saline irrigation on olfactory function in individuals with normal smell.
• To assess changes in smell identification test scores and cyclic adenosine monophosphate (cAMP) levels after nasal irrigation.

Main Methods:

• Healthy volunteers were randomized into a control group or a nasal saline irrigation group.
• Olfactory function was assessed using the University of Pennsylvania Smell Identification Test (UPSIT) before and after the intervention.
• Nasal cell samples were collected to measure cyclic adenosine monophosphate (cAMP) levels.

Main Results:

• There were no statistically significant differences in UPSIT scores between the control and irrigation groups post-intervention (p = 0.48).
• No participants reported any subjective loss of smell.
• Nasal saline irrigation did not significantly alter cyclic adenosine monophosphate (cAMP) levels, regardless of the collection method used.

Conclusions:

• Nasal saline irrigation demonstrates no discernible subjective or objective effect on olfactory function.
• The procedure does not appear to influence cyclic adenosine monophosphate (cAMP) levels, suggesting it does not impact this potential marker of smell.
• Nasal saline irrigation can be considered safe for olfaction.