Shifting dullness in hydropneumothorax steps
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hydropneumothorax shifting dullness physical examination technique
Shifting dullness in hydropneumothorax: steps
- Position the patient sitting upright with the chest exposed.
- Percuss the affected hemithorax, usually posteriorly and laterally, from above downward.
- You will find a transition from hyperresonant/tympanitic note above (air) to dull note below (fluid).
- In hydropneumothorax, this transition is usually a horizontal line rather than the curved meniscus of a simple pleural effusion.
- Mark the level where percussion changes from resonant to dull at one or more points.
- Turn the patient to the opposite lateral decubitus position and wait briefly, about 1 to 2 minutes, for free pleural fluid to move.
- Repeat percussion and compare the level.
- If the dull area moves to the dependent part of the chest, shifting dullness is positive.
- This supports the presence of free mobile fluid with air in the pleural cavity, consistent with hydropneumothorax.
Other supporting signs include a succussion splash, reduced or absent breath sounds, and reduced vocal fremitus over the affected side. A chest radiograph, ideally erect, confirms an air-fluid level. The PMC clinical description notes decreased breath sounds, a straight horizontal level of dullness over fluid, shifting dullness, and a succussion splash in hydropneumothorax.
Do not repeatedly reposition a patient with marked respiratory distress or suspected tension physiology.
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