In the last Long Covid talk that I attended and wrote about (here: Pulmonary Manifestations of Long Covid), the pulmonologist and intensivist says that one problem with Long Covid is that we do not have imaging that can “see” it.

That is, the chest x-ray looks normal, the echocardiogram may look normal (heart ultrasound), the chest CT scan may look normal, a brain CT or MRI may look normal, but the patient may still be tachycardic, feel exhausted, feel brain fog and have multiple other symptoms.

That pulmonologist listed five of the top mechanisms that are prolonged in the immune system. Most of the scientists and physicians are framing this as “immune system dysfunction”. I am not. I am framing it as “you were really really sick and your immune system is still on high alert and trying to protect you so you can recover”. Now wait, you say, how could chronic fatigue like symptoms protect me? Well, if you are exhausted, you can’t go to work and you’ll stay quiet at home most of the time and less exposure chance. But what about brain fog? Again, this will slow your interaction with other people and force you to rest and heal. But, you say, I don’t like it. Well, yeah. Patience. We call grumpy patients that are recovering “convalescents”. It is a good sign when they are grumpy and over it and just want to be better. That doesn’t mean I can make myself or anyone else heal faster.

The pulmonologist says that the best test is the six minute walk test. This is usually done by a respiratory therapist. The person walks in a circle for six minutes wearing a pulse ox, with the respiratory therapist doing regular checks. This distinguishes between the people who have primarily a lung issue from all the other issues. If the person is tachycardic (fast heart rate) but not hypoxic (oxygen level dropping), then it’s not primarily lungs though blood clots to the lungs sometimes have to be ruled out. One of the mechanisms in the immune system is microclots and an increased risk of blood clots. That can mean heart attack, stroke, or pulmonary embolus, a clot in the lungs. The microclots are suspected of causing some of the muscle fatigue and exercise intolerance, by clogging capillaries and reducing oxygen flow to muscle cells. Muscle cells do not like this at all.

I have done my own quick walk test with patients since 2003, when I had terrible influenza. About a week after my influenza started, with the temperature of 104 and heart rate at 100 at rest and 135 walking, my temperature came down. However, the fast heart rate continued. Normal heart rate is 70-100 and 135 walking will make you feel exhausted. I lay on the couch and could barely make my kids dinner for two months. It resolved then. I read a book about influenza and thought that I had “influenza viral pneumonia” where there is lung tissue swelling, reducing the air spaces, after influenza.

My quick walk test in clinic is to check a sitting oxygen level and heart rate and then have the person walk. I would have them walk up and down a short hall three times then sit down. When they sat, I watched the pulse oximeter recovery. Some people would jump from a resting heart rate of 62 to a walking heart rate of over 100, say 120. Their oxygen level could stay normal or it could drop. If they dropped below 88, I would get home oxygen and forbid them to return to work. If their oxygen level held, then they needed to rest until their walking heart rate stayed under 100 and they were no longer exhausted by gentle or normal activity. If they return to work with a walking heart rate of 120, they will be exhausted and are more likely to get a secondary pneumonia or have other problems. The heart does not like to run at 120 all the time. You can see why a person who already has some coronary artery blockage would be more likely to have a heart attack if they get pneumonia from influenza or Covid-19.

The conferences I am attending are talking about “targets” in the immune system. That is, new drugs. I think the science is wonderful and amazing, but I also think we need to step back and say, this is a really really bad infection and some people need a lot of support and reassurance and time to heal. Reassure them that even though they have not yet returned to normal, the immune system is working hard to protect them from other infections and it is saying very very loudly that they need to rest. Rest, recuperate and trust the immune system. Some things need immediate treatment, especially blood clots, heart attacks and strokes, but once those are ruled out, we need to support people through their convalescence and healing.

______________

The photograph is from April 2021, a few days after I was put on oxygen. A selfie.