What effect does isoflurane have upon ciliary beat pattern: an in vivo study.

Area of Science:

• Anesthesiology
• Rhinology
• Cell Biology

Background:

• Nasal cilia are crucial for mucociliary clearance.
• The effects of anesthetic gases administered via laryngeal mask on nasal ciliary function remain largely unstudied.
• Known anesthetic agents like isoflurane can decrease ciliary beat frequency.

Purpose of the Study:

• To investigate the impact of isoflurane anesthesia, delivered via a laryngeal mask, on nasal ciliary beat pattern and frequency.
• To determine if isoflurane causes dyskinetic ciliary beating or increases immotile cilia.

Main Methods:

• Brush biopsies of nasal mucosa were obtained from patients undergoing nasal surgery before and after anesthesia with isoflurane via laryngeal mask.
• Light microscopy and high-speed digital video recordings were used to assess ciliary beat frequency.
• Ciliary beat pattern and proportion of immotile cilia were analyzed using slow-motion playback to score for dysmotility.

Main Results:

• A statistically significant decrease in ciliary beat frequency was observed after isoflurane exposure (from 10.24 Hz to 9.20 Hz, P < 0.01).
• Isoflurane administration did not alter the ciliary beat pattern.
• The proportion of immotile cilia in the nasal mucosa samples remained unchanged.

Conclusions:

• Isoflurane anesthesia administered via a laryngeal mask significantly reduces nasal ciliary beat frequency.
• Isoflurane does not induce dyskinetic ciliary beating or increase the number of immotile cilia.
• These findings contribute to understanding the effects of common anesthetic agents on airway mucociliary function.