Valsalva manoevre:
Forcibly exhaling with mouth and nose closed. This outlines the upper respiratory tract with air. Allowing for better evaluation.
Expiration on CXR:
Obstructed Lung will show an increased radiographic density on CXR - Emphysema.
On expiration the affected lung will have a raised diaphragm as air cannot leave the lungs.
The heart will also by pushed away from the affected lung, due to the lung expanding as air cannot leave but can enter.
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