Is there a biomechanical cause for spontaneous pneumothorax?
Aaron R Casha1, Alexander Manché2, Ruben Gatt3
1Department of Cardiac Services, Mater Dei Hospital, Msida, Malta Faculty of Medicine, Department of Anatomy, University of Malta, Msida, Malta aaron.casha@um.edu.mt.
Summary
Chest wall shape influences primary spontaneous pneumothorax. A low thoracic index in young males significantly increases pleural stress, suggesting a biomechanical cause for this condition.
Area of Science:
- Biomedical Engineering
- Thoracic Surgery
- Pulmonology
Background:
- Primary spontaneous pneumothorax (PSP) is often attributed to unknown causes.
- Chest wall morphology may play a role in PSP pathogenesis.
Purpose of the Study:
- To investigate the association between chest wall shape and the development of primary spontaneous pneumothorax.
- To quantify pleural stress in relation to thoracic index using finite element analysis.
Main Methods:
- Chest radiographs and computed tomography (CT) scans were used to measure rib cage and apical lung shape in PSP patients and controls.
- A finite element analysis (FEA) model of the lung apex was created to assess pleural stress under varying thoracic indexes.
Main Results:
- PSP patients exhibited a taller, wider, and flatter chest with a lower thoracic index compared to controls.
- FEA revealed significantly higher stress in the lung apex, exacerbated by low thoracic indexes, leading to a 20-fold increase in stress levels.
- Prominent rib indentations, particularly on the first rib, were observed in PSP patients.
Conclusions:
- A low thoracic index, characteristic of PSP patients, is associated with a 20-fold increase in apical pleural stress, indicating a potential biomechanical etiology for PSP in young males.
- Subtle alterations in thoracic index, as seen in females or with aging, may reduce pleural stress and the risk of PSP.
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