If there is trapped lung after a thoracentesis in an outpatient setting, in a patient who has stable vitals and no dyspnea, is there a role of overnight observation?

I am assuming this question came up because there was a pneumothorax post-thoracentesis, and you are suspecting entrapped lung.

If you are confident that the patient has an entrapped (trapped) lung and remains completely asymptomatic, overnight observation or hospitalization is not necessary.

In case...

In these situations, it is important to use your clinical scenario -- including patient history and prior imaging -- to guide management.

I think it comes down to what your pre-test probability of the cause of the effusion is. If you're evaluating for a malignant effusion or another exudative/inflam...