[Sacamuelas]

I think Bdonham is referring to the condition you describe.

If I go by what you typed though, then I think you referring to terminology describing the situation verses the actual medical diagnosis, Pericardial tamponade. "Pericardial stenosis" is my guess of what you were attempting to spell. Stenosis literally means an "abnormal narrowing of a bodily canal or passageway".

Therefore, you are most likely describing the process that Bdonham refers to in his post.

Note- there is one similar situation that "sort of " fits with your description. The space surrounding the heart (pericardium) can be compressed from the outside forces during a tension pneumothorax, and that condition can be treated by needle aspiration initially too. You wouldn't be "decompressing the membrane around the heart" but in laymen's terms it might be described in a similar way since both Tx use needle decompression to relieve the pressure(one from the pericardial sac and the other from the pleural sac around the lung).