9/23/23, SCCM Podcast: '
The Long and Short of Long COVID'
Wes Ely: “...extreme fatigue, which fatigue doesn't really do it justice. These patients experience something so far beyond that. They get completely zapped of any ability to carry on a normal daily life. They refer to it as PEM, post-exertional malaise. But post-exertional malaise is not just a physical catastrophe for them, it's a mental catastrophe too. The brain and the body get so exhausted that they really can't function in their daily life, their jobs, their interactions with human beings.”
“So what's going on? What's happening is that the blood vessels in the brain are having endothelial damage, and we know in COVID that the endothelin has ACE2 receptors. So the virus is attacking those ACE2 receptors, and then we're having a leaky blood brain barrier."
"It's not as much as the virus is getting in and attacking the neurons, but the virus gets in and attacks the glial cells, astrocytes, microglia, et cetera, and those glial cells are what support the neurons. So when the neurons don't have this support structure, think of it as the nurturing environment to keep the neurons healthy and happy, then they go south, they have a tremendous problem, and so the person starts having issues with memory, executive dysfunction, processing speed, all kinds of neurocognitive deficits.”.
“Can we ask you a question about this? Glial cell destruction, is that reversible?:
"Yeah, I love this topic. I was actually very ignorant about this when I first started doing long-term brain dysfunction research after the ICU. And when I was doing my basic science research, I did neutrophil priming. And neutrophils get primed quickly. They dump their azurophilic and basophilic granules quickly. And the whole thing's over within a couple of hours. The microglia in the brain, completely different beast. They can get primed and stay primed for eight weeks, 12 weeks, not a day. And so, when these microglia and astrocytes get primed, they start getting extremely overactive, laying down all kinds of scar tissue, if you want to think about it like that, where, imagine the highway is the bio (?) into the brain. And if the cars, the electoral signals, need to get from one place to another, they can't get there because of downstream axonal injury laid down during this priming process. So, the answer is, yes, this is reversible.”
“They're trying to do things that will help them be the matriarch and patriarch to their family, manage their finances, get directions in a car. And they can't do any of these things because their organizational abilities are extremely thwarted. And that's because of frontal lobe problems. They're also having hippocampal problems, which is memory. We think that the memory and executive dysfunction are tied together very intricately.”
“And there's a lot of stigma associated with that because people are acting like that they're making this up. And I want to say that they are the experts of their illness. They're not making it up. It absolutely is real. And for many years, we kind of denied ME/CFS and fibromyalgia. I think we just have to acknowledge that we don't know everything in medicine.”
“We need well-designed, prospective, random-mouse-controlled trials. Right now, people are doing junk out there. They're trying everything because they're desperate. It's a nightmare out there. And this anecdotal approach is not going to get us the answers we need. So we need NIH-funded, VA-funded, foundational-funded, prospective RCTs of the different things that we think are the key factors in the story of long COVID, the path of pathobiology, which are antivirals for the persistence of virus. We need immuno-modulatory agents that will quell the immune activation and the prolonged inflammation. So we need better science.”