The sleep apnea needs to be looked into, before the surgery. The recovery will be more challenging without a device

Naixi

Very good question. Having obstructive sleep apnea (OSA) does put you at risk for breathing problems after any surgery. Shoulder surgery can be a bit tricky with OSA; most anesthesiologists will place a nerve block before surgery to help with pain for 1-2 days after the procedure is done. Along with blocking the nerves that provide pain sensation to the shoulder, the nerve to the diaphragm (the phrenic nerve) is often blocked to some degree. This means your breathing may be slightly impaired. This makes the CPAP machine that is used to treat OSA even more important. You will also be prescribed pain medications that suppress your breathing to a degree. It would be best to have a diagnosis of OSA and get a CPAP prior to surgery.
That said, I take care of many patients with undiagnosed OSA and many more who simply refuse to wear the CPAP at night despite knowing they have OSA. If your shoulder is pretty bad it is reasonable to proceed with the surgery and handle the OSA issue afterward. You must still get tested for OSA in the future as it is dangerous in the long run

Yes, just make sure your anesthesiologist is aware.

Are you using machine at night when you go to sleep If you are Not using then you don’t have to worry too much Let your Anesthesiologist be aware of it