I can answer only from personal experience what happened to DesertWife who died from ALS, specifically her diaphragm being paralyzed, not cancer which has a reputation for causing a lot of pain towards the end.
ALS, for those who don’t know, strikes the anterior horn cells, nerve cells in the spinal column that descend from the brain and connect with the motor nerves that go out to the muscle being ennervated.* These are the exact same nerves that are affected by poliovirus except waking up one morning paralyzed, ALS has a slow onset and they don’t know what causes it.
Also like polio it can affect limbs or the diaphragm and if the latter, the victim will be on a respirator the rest of their life. DW had some pain in her limbs – as various muscle bundles stopped working, the remaining ones were being overtaxed – but she had no particular pain or difficulty breathing, until the crisis.
She had weakened to the point it was difficult to move around any more and a hospital bed with raising ability had been lent and placed in the living room earlier in the week by the local ALS society. That morning when I went to work she asked I leave several file folders with her papers within reach so she could go through them. When I got back that night she said, sounding worried, “I couldn’t do it.” Looking back on it I suspect her lungs had been failing unnoticed and her brain was short of oxygen.
I fixed dinner which included a fancy mushroom soup with slices in it instead of the little cubes. After dinner she began having difficulty breathing and had the impression she had inspirated one of the slices. I drove her to ER where it was quickly determined her lungs were filled with fluid. She went into surgery where the fluids were drained (over a half-liter), she was intubated and a gastric tube was also placed along with a catheter.
The doc said bluntly, “She may well not come out of this. If there’s anyone who’d like to see her, now is the time to call them.” Her two siblings and mother flew in from Iowa, her two daughters plus a husband and a life-long friend drove from California. This was all at the hospital where she’d worked until forced to stop about two months before so a lot of her coworkers also stopped by for a minute or two.
She was alert and in no apparent pain but they may have been giving her analgesics – all those tubes can be damned uncomfortable. The morning of the third day she came down with a bad headache. Since she was a heavy coffee drinker I immediately recognized it as caffeine withdrawal and with the nurses’ permission carefully fed her a few ounces of coffee cooled to tepid via a cup and straw.
She seemed to be doing well and they were going to try removing the ventilator tube the next morning. Late that night, shortly before I left her I told her the bravest thing I have ever done. “What counts is the quality of your life. Do not be afraid to stay because of the burden you’d be. Do not be afraid to go because of how lonely I will be.” She had a very active life and I knew which choice she would make since – as all the literature said – once she was on a ventilator she would never be off of it. She hated being stuck in the bed all day; being tied to a machine to stay alive would be intolerable.
I had misunderstood the schedule and when I arrived at the hospital the next morning everyone else (but the friend who’d had to return to California) was there and the ventilator shut off an hour before. Up until then and for some minutes after I arrived she seemed to be doing okay but then began to fail. The docs said they had to turn the ventilator back on or she would die.
After consultation among me and her daughters – I still have the paper with her last words on it, Does this make sense? – we agreed to follow her wishes and not put her back on the ventilator. Except for the catheter the tubes were removed and she was moved from ICU to the hospice within the hospital with a much more pleasant room at about 11am.
From then on she’d open her eyes once in a while to look around the room but mostly kept them closed while we took turns holding her hands. A nurse would come in every hour to check her vitals. About 3pm she sat up looking around but not focusing on anything then settled back down and never opened her eyes again. I suspect that was the last fully cognitive function of her brain.
About 6pm her older daughter, husband, and I went to dinner and upon our return the rest went. Before they returned, she was gone. She didn’t struggle to breathe and there were no rales; her breaths simply came farther and farther apart, shallower and shallower until the next one didn’t come. Her daughter and I who were on opposite hands looked at each other. I waited another minute then fetched a nurse who listened with a stethascope and nodded her head. The doctor called it at 7:05pm, May 25th, 1992.
I have never been the same since.
*The posterior horn cells carry sensation and touch information back up to the brain and are not relevent here.