I had the real deal in PACU last year. Patient had some vascular procedure in the neck with multiple wires down the carotid and IJ. Got real tachy in the PACU, BP drifts down, starts to have altered mental status. Happened over about 10 minutes, so not immediate. Had discussed with his surgeons, and they placed a cardiology consult prior to him getting unstable. Once he started to get unconscious/unstable, I intubated him (no drugs) and was starting to give epi. Cardiologist (non-interventional guy) walked in just as we were starting compressions. I already had someone running for a TTE probe, so he took a look and saw a big effusion. I asked him if he wanted to try to needle it or if he wanted me to, and he volunteered (whew!). 14g needle substernal with a stopcock and a 60 cc syringe. We pulled about 200 cc out and watched his a-line give us a waveform again in real time. While we were setting up cath lab for pigtail placement, the effusion recurred and his BP tanked again. Did one more pull for about 300 more ccs with immediate improvement. Stable for transport to cath lab, but did code again while getting set up in cath lab. Pigtail placed stat, and he again stabilized immediately. Turns out vascular guys poked a hole in his RV with their wires. He ended up coming to the OR at about midnight for sternotomy and oversew of hole. That was a fun call night.
If my patient was coding and I thought it might help (and there was no surgeon around), I'd definitely give it a shot.