Thank you for all of your replies. The support from this forum is helping us to make it through this extremely difficult time. Dad was still pretty clear-headed for most of yesterday, but he's not doing that well. I think I mentioned that he has pleural effusion. He now also has heart failure. On a positive note, he is no longer gurgling. His breathing is much better and less labored.
He tried to transition from the bed to the bedside commode twice yesterday. Even with the assistance of two CNAs, it took a lot out of him. Something happened each time after the exertion: he would become very weak, nonresponsive, with a blank stare. This lasted a minute or two. Afterwards, he was very confused. This was happening in the rehab center after exertion, too. I don't know what is causing it. Nonetheless, it is amazing that he was able to make the transition twice because he hadn't been out of bed in 3 days. Also, he sat in the recliner for 30 minutes.
Towards the end of the evening, he started getting confused. This was discouraging, but he's still tons better than he had been. In the previous two days, he had been confused 90% of the time; yesterday, he was confused only 10% of the time.
Today, he is supposed to get a four-hour stress test. Just the thought of four hours of testing sounds stressful! I will accompany him. All three of my brothers are now here in town, so he has a lot of support and love. Thank you for all of your prayers.