This is a complete guess.
It is warmer in Italy than the USA. It is moving into 50 degree weather. Approaching Spring. When I think of bronchospasm, I think of asthma. Some folks that suffer from severe asthma use CPAP to help with breathing. Sometimes, that asthma is seasonal. Sometimes even seasonal asthma can be severe. Perhaps, Pope Francis has allergies, even to some sorts of food.
Or, his heart is unable to move fluid from his lungs and he is reliant on CPAP to move the fluid aside to breath.
It may or may not be allergies, but, in good conscience I had write what I thought. I wish him well and comfort. Keep breathing.❤️