Olfactory impairment after total laryngectomy: A prospective cohort study

Area of Science:

• Otolaryngology
• Neuroscience
• Quality of Life Research

Background:

• Total laryngectomy disrupts the upper and lower airways, necessitating breathing through a stoma.
• This altered airflow significantly impacts olfactory function, as nasal airflow is crucial for smell perception.

Purpose of the Study:

• To investigate the reduction in olfactory function following total laryngectomy.
• To determine associations between clinical characteristics and olfactory impairment post-surgery.

Main Methods:

• A prospective cohort study involving 40 patients undergoing total laryngectomy.
• Olfactory ability was assessed pre- and post-surgery using the validated Sniffin' Sticks test.
• Clinical characteristics were analyzed for correlations with olfactory impairment.

Main Results:

• Pre-surgery, 82.5% of patients had normal smell (normosmia), and 17.5% had reduced smell (hyposmia).
• Post-surgery, all patients experienced olfactory impairment, with 87.5% developing complete loss of smell (anosmia).
• A statistically significant decline in olfactory function was observed post-laryngectomy (p < 0.001). No clinical factors were significantly associated with impairment.

Conclusions:

• Olfactory impairment is a common and significant consequence of total laryngectomy, negatively affecting quality of life.
• Loss of nasal airflow and potential olfactory epithelium changes are primary causes.
• Universal preoperative counseling and postoperative olfactory rehabilitation are crucial for all patients.