Today’s Zoom lecture was about pulmonary manifestations of Long Covid, and this is from the Schmidt Initiative for Long Covid Global ECHO Webinar Series, out of the U of New Mexico.

First of all, the talk is brilliant. The speaker is Lekshmi Santhosh, MD, MAEd, Asso Prof Med, Pulm Critical Care Med, UCSF, Intensive Care.

Two things to start with: she stressed the six minute walk test for patients, to distinguish oxygen desaturation (dropping) from the people who have terrible tachycardia (fast heart rate) only. The oxygen drop indicates that the person needs lung studies and may need oxygen, while tachycardia alone means either a heart problem, chronic fatigue/ME pattern or dysautonomia, where the heart goes fast when the person sits or stands up. Her point was that it’s a simple test and that Long Covid presents in multiple different patterns.

The second point is that there are least five main mechanisms that Long Covid can mess us up and people can have one or many. There is a review article in Nature last month (I need a copy!) and it talks about these five: immune system problems, gut microbiome problems, autoimmune responses, blood clotting/microclotting/endothelial problems and dysfunctional neurological signalling. SO: this is a MESS. She says that patient care needs to be individualized depending on which mechanism(s) are predominant and it can be more than one. This Covid-19 is a hella bad virus.

So: “The underlying biological mechanism may not be the same in each patient.” That is the understatement of the year.

She reiterates that the current diagnostic criteria, subject to change, is symptoms that last longer than 12 weeks after Covid-19 and two months past that. She states that the symptoms can wax and wane and that we need to listen to and believe patients.

In JAMA this month, there is an article that uses big data to find which symptoms are more associated with Long Covid, and lists 13 symptoms. Smell/taste tops the list but fatigue is there too. However, this is not a list for diagnosis, it’s a study list.

She also is careful to say that the treatment for the pulmonary manifestations is not the same as the people with the pattern that resembles chronic fatigue syndrome/ME. The pulmonary people can build exercise tolerance, but the CFS/ME folks need a different regimen, with pacing and energy conservation. That sounds like a subtle difference. I had both though my CFS/ME is weird. It does not put me in bed, I just can get really tired and need to sleep. It’s a bit invisible. People see me dance and would not guess that I have CFS/ME. All relative to previous function and energy, right?

For lung manifestations, she lists a pyramid, with the more rare things at the bottom. As follows:

1. persistent dyspnea (shortness of breath)
2. post viral reactive airways disease (asthma that can resolve from irritated pissed off lung tissue)
3. deconditioning. She says that the isolation and quarantine with some people in very small rooms, leads to terrible deconditioning in some folks. They can build up, especially with supervised exercise with pulmonary rehabilitation and/or physical therapy. It is scary to exercise when you are short of breath and the supervision really helps, with limits on how much you should push, or encouragement to push.
4. organizing pneumonia. This is rare and responds to steroids. Otherwise steroids are not good for the muscles in Long Covid, with the exception of inhaled steroids for the asthmatics and post viral reactive airways.
5. post ARDS fibrosis: fibrosis is fibrous scarring that can form in the lungs. Anyone who has any terrible pneumonia and is in the ICU and intubated and on a ventilator can get this. Not everyone gets it, thankfully. ARDS is Acute Respiratory Distress Syndrome. Luckily the fibrosis is rare and it turns out that in some people it improves with time, like years. She does not recommend the pulmonary fibrosis medicines right now. There are many causes of pulmonary fibrosis besides infection.
6. PVD: peripheral vascular disease. Covid-19 increases clotting, so we have to look for both clots and for disease in arteries, which could be lungs, brain, heart, anywhere in the body.

She says DON’T assume that chest pain is from the lungs and don’t miss cardiovascular. That is, rule out a heart attack and pulmonary embolus first.

Other lung problems have to be kept in mind that are not caused by Covid-19. This list: Reflux associated cough, pleuritic pain, neuromuscular disease, vocal cord dysfunction, tracheal stenosis, tracheomalacia. Watch for those. She says that it is very very important to look at old chest x-rays and CT scans, because those can show previous signs of emphysema/COPD/asthma/fibrosis.

Testing: She puts the 6 minute walk test first. AFTER the thorough history and making sure there are no red flags for pulmonary embolism and heart attack. Those have to ruled out if there is any suspicion. Next: pulmonary function testing. If the DLCO is low, consider a chest CT. Consider TTE -TransThoracic Echocardiogram, to look at the heart. Labs: CBC (blood count), ESR, CRP, thyroid, +/-CPK.

She has diagnosed people who are sent to her with NOT Long Covid: they have metastatic lung cancer, metastatic prostate cancer, new pregnancy, hypersensitivity pneumonitis and many other things. She says, “Don’t assume it is Long Covid. Sometimes it isn’t.”

Now, this is all a formidable list of problems and this is JUST the lungs. Long Covid can affect every system in the body and every patient is different.

She also says that she has done more disability and accommodation paperwork in the last three years than in her entire career before that. That the US disability system is a horrid mess and that she has to talk to employers and insurers OFTEN to say that the person will get better faster and have less long term problems if she treats now and they have rest and return to work may need to be very gradual.

She approaches new patients by asking which symptoms are worst. She thinks about severity of the infection, vaccination status, previous/present other medical problems and habits that can contribute or worsen things (smoking, vaping, exposures). Her clinic is for Long Covid pulmonary, but now they have opened up a neurological branch. They use multiple other specialists as well.

Last quotation: “Until we elucidate the biology and have clinical trials, treatments are largely symptomatic.” So the basic science studies working on immune system, the gut microbiome, the clotting problems, are huge in figuring out what to do in clinical trials. This is a tremendously complex illness and three years into Covid-19, we are still trying to figure out the multiple mechanisms that cause Long Covid.

This was a very hopeful lecture from my standpoint, admitting that this is complex but that we are also working to sort out the mechanisms and work on treatments. She works hard at getting patient input and feedback as well.

Two links: A free PDF from Johns Hopkins on Bouncing Back from Covid. https://www.hopkinsmedicine.org/physical_medicine_rehabilitation/coronavirus-rehabilitation/_files/impact-of-covid-patient-recovery.pdf

The American Physical Therapy Association has articles as well: https://www.apta.org/patient-care/public-health-population-care/long-covid

Also here are webinar links:

SILC Global ECHO Webinar Series Resource Links June 28, 2023

• Long Covid Pathophysiology: https://www.nature.com/articles/s41579-022-00846-2
• LIINC Study: https://www.liincstudy.org/en/study-findings
• LIINC Study Pathophysiology: https://www.jci.org/articles/view/163669
• Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection:
  https://jamanetwork.com/journals/jama/fullarticle/2805540
• Identification of Distinct Long COVID Clinical Phenotypes Through Cluster Analysis of Self-
  Reported Symptoms: https://pubmed.ncbi.nlm.nih.gov/35265728/
• Impact of a Multidisciplinary Post-COVID-19 Clinic on Hospital Admissions and ED Visits:
  https://pubmed.ncbi.nlm.nih.gov/36610666/
• Functional Disability 5 Years after Acute Respiratory Distress Syndrome:
  https://www.nejm.org/doi/full/10.1056/nejmoa1011802
• Fatigue Symptoms During the First Year Following ARDS:
  https://pubmed.ncbi.nlm.nih.gov/32304774/

Now, how will I use the Ragtag Daily Prompt riposte for this? I think I will just say again how important it is to listen to and believe our patients!

The photograph is from Marrowstone Island, East Beach. The shape in the driftwood is sort of lung shaped.