Beta-trace protein in pediatric otitis media with effusion.

Area of Science:

• Biochemistry
• Otolaryngology
• Pediatrics

Background:

• The middle ear cleft has connections to the inner ear and subarachnoid space, particularly in infants.
• Permeability between these compartments is not fully understood.

Purpose of the Study:

• To quantify beta-trace protein (BTP) concentration in middle ear secretions from children with otitis media with effusion (OME).
• To investigate potential permeability between the cerebrospinal fluid (CSF)/inner ear and the middle ear in OME.

Main Methods:

• Collected 93 middle ear effusion samples from 65 children undergoing myringotomy or tympanotomy.
• Quantified BTP using immunonephelometry in 63 applicable samples from 52 subjects (median age 3 years).
• BTP is a specific marker for CSF and perilymph, absent in serum and mucosal secretions.

Main Results:

• Median BTP concentration in OME samples was 2.4 mg/L (range 0.2-14.2 mg/L).
• BTP values varied significantly, with one sample exceeding CSF levels (18.3 mg/L).
• Compared to serum and mucosal secretions, BTP levels in OME were higher.

Conclusions:

• Elevated BTP in pediatric OME suggests potential permeability between the CSF/inner ear and the middle ear.
• This finding may indicate a compromised barrier in OME.
• Detecting BTP could aid in assessing the risk of complications.