Olfactory perception in patients with a mild traumatic brain injury: a longitudinal study

Area of Science:

• Neuroscience
• Otorhinolaryngology

Background:

• Mild traumatic brain injury (mTBI) can impact sensory functions.
• Olfactory dysfunction is a potential consequence of head trauma.
• Understanding olfactory changes post-mTBI is crucial for patient care.

Purpose of the Study:

• To longitudinally assess olfactory perception in patients with first-time mild traumatic brain injury (mTBI).
• To evaluate changes in odor detection and perception at 2-4 weeks and 6 months post-trauma.

Main Methods:

• A longitudinal study design tracking patients with mTBI and healthy controls.
• Utilized an olfactometer for automated odor presentation.
• Assessed odor detection (yes/no) and self-reported odor perception (intensity, pleasantness).

Main Results:

• At baseline, mTBI patients exhibited impaired odor detection but perceived odors as more intense and less pleasant.
• These olfactory deficits in mTBI patients resolved by the 6-month follow-up.
• No significant differences in olfactory function were observed between groups at follow-up.

Conclusions:

• Patients with mTBI experience transient olfactory dysfunction in the early weeks post-injury.
• Altered olfactory perception may affect eating behavior and quality of life after mTBI.
• Olfactory function shows recovery within six months following mild traumatic brain injury.