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Diaphragm dimensions after single-lung transplantation for emphysema
M Cassart1, Y Verbandt, P de Francquen
1Departments of Radiology, Thoracic Surgery, and Chest Medicine, Erasme University Hospital, Brussels, Belgium.
Summary
Single-lung transplantation for emphysema can alter diaphragm size. While configuration normalizes, the diaphragm
Area of Science:
- Pulmonary Medicine
- Thoracic Surgery
- Medical Imaging
Background:
- Emphysema significantly impacts lung function and respiratory mechanics.
- Diaphragm function is crucial for breathing and can be affected by lung diseases and surgery.
- Single-lung transplantation (SLT) is a treatment option for severe emphysema.
Purpose of the Study:
- To quantify diaphragm surface area and geometry after SLT for emphysema.
- To compare diaphragm dimensions in SLT patients with healthy controls.
- To investigate the impact of mediastinal shift on diaphragm morphology post-SLT.
Main Methods:
- Three-dimensional reconstructions using spiral computed tomography.
- Measurement of total diaphragm surface area (Adi), dome surface area (Ado), and zone of apposition (Aap).
- Data acquisition at different lung volumes: supine functional residual capacity (FRC), mid-inspiratory capacity, and total lung capacity (TLC).
Main Results:
- Diaphragm dome (Ado) and total surface area (Adi) were smaller on the transplanted side compared to controls.
- Mediastinal shift towards the lung graft reduced Ado and Adi.
- Diaphragm dome curvature remained similar between the grafted and contralateral sides.
Conclusions:
- After SLT for emphysema, diaphragm configuration largely normalizes.
- However, Ado and Adi remain reduced post-SLT due to mediastinal displacement.
- These findings highlight persistent anatomical changes in the diaphragm following SLT.