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HOW WE TEACH

Resorption of gas trapped in body cavities: comparison of alveolar and pleural space with inner ear and paranasal sinuses

Zdravko Ivezi, Sven Kurbel, Sanda krinjari-Cincar and Radivoje Radi

Osijek Medical Faculty, University of Osijek, Osijek, Croatia

Address for reprint requests and other correspondence: S. Kurbel, Osijek Medical Faculty, J Huttlera 4, 31000 Osijek, Croatia (e-mail: sven{at}jware.hr)

This paper describes our attempt to devise a short text aimed at improving students' understanding of gas resorption in body cavities. Students are expected to understand the mechanisms behind paranasal sinusitis, otitis media, closed pneumothorax, and atelectasis of collapsed lung tissue, all used as examples. On the basis of the interpretation that during pneumothorax resorption, gas diffuses down pressure gradients into the blood, students are encouraged to calculate tables of pressure gradients for the above-mentioned pathological conditions. After answering a few questions, students need to analyze and eventually accept the following conclusion: in cases of air trapping in collapsible body cavities, all gases will be fully reabsorbed without pain. Air trapping in bone cavities leads only to partial reabsorption of gases and results in subatmospheric intracavity pressure. Partial vacuum causes painful mucosal edema and free fluid secretion.

Key words: paranasal sinusitis; otitis media; closed pneumothorax; atelectasis; air trapping

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