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Mastoid buffering properties: I. Gas partial pressures.

E Raveh¹, J Sadé, H Mover-Lev

¹Department of Bioengineering, Faculty of Engineering and Sackler School of Medicine, Tel-Aviv University, Israel.

The Annals of Otology, Rhinology, and Laryngology

|August 24, 1999

Summary

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Gas diffusion within the middle ear and mastoid air cell system (ME-MACS) is rapid, preventing significant gas partial pressure differences. The ME-MACS functions as a single, homogeneous gas compartment.

Area of Science:

Otolaryngology
Respiratory Physiology
Biophysics

Background:

Gas partial pressure differences between the middle ear (ME) and blood influence ME gas economy.
Potential gas partial pressure gradients within the ME-mastoid air cell system (ME-MACS) are not well understood.

Purpose of the Study:

To investigate gas diffusion rates between different compartments of the ME-MACS.
To determine if significant gas partial pressure differences exist within the ME-MACS.

Main Methods:

Measured gas diffusion rates between compartments in an artificial ME-MACS model.
Quantified gas diffusion rates in human temporal bones using the ME-MACS.

Main Results:

Gas diffusion between various ME-MACS regions, including the mastoid tip, is rapid.

Related Experiment Videos

Observed diffusion half-lives ranged from 0.8 to 5.3 minutes, averaging around 2 minutes.

Conclusions:

The rapid gas diffusion rate homogenizes gas composition throughout the ME-MACS.
The ME-MACS can be considered a single, uniform gas pocket due to efficient gas exchange.