Sept. 10, 2020 — This past spring, health care providers at hospitals around the country scrambled to treat people who were critically ill with a virus they’d only just heard of themselves. Usually, when a severely ill person arrives at the hospital, doctors already know or can quickly find established guidelines, based on years of research, for treating the sickness. But in the spring of 2020, nothing was established about COVID-19.
“It was a dramatic situation. We had a lot of sick people, in a very short period of time, and it was overwhelming to take care of them. There was an almost irrational exuberance to try any treatment that we could think of,” says David Kaufman, MD, director of medical intensive care at New York University Langone Health in New York City.
While doctors may have at times rushed to try anything, that trial and error over the last 6 months has helped accumulate the scientific evidence of what works and what doesn’t in the treatment of COVID-19.
“The ability of the medical community to pull together quickly to get these large critical care studies done in a very short period of time with reliable, high-quality results is amazing,” Kaufman says. “It’s like being in a wartime economy when all automobile and refrigerator factories convert to make tanks and planes.”
The Case for Steroids
At the start of the pandemic, doctors didn’t have a go-to medication they could give to critically sick COVID-19 patients admitted to their ERs and ICUs. Today, corticosteroids are that medication. Last week, on the heels of several scientific studies that supported the move, the World Health Organization (WHO) released its official recommendation that people with severe COVID-19 receive steroids to improve their chances of survival.
“Low-dose steroids for 10 days or until the patient is discharged, whichever one comes first, can actually help with symptoms, can avoid escalating to a ventilator, and can lower the risk of death,” says Javier Lorenzo, MD, a critical care anesthesiologist at Stanford Hospital and Clinics in Stanford, CA.
That’s because steroids act as anti-inflammatories. The worst cases of COVID-19 are marked by extreme inflammation that doesn’t let up. A little inflammation at the beginning of a viral infection helps fight it off. But in serious cases of COVID-19, the inflammation gets out of control and can eventually lead to organ failure and death.
“Steroids may not be good for people who have only had the infection for a few days because they may actually limit the body’s ability to fight infection,” Kaufman says. “But in people who are critically ill because of over-inflammation, steroids help put a lid on it.”
Growing Evidence for Remdesivir
“This data is not quite as robust as it is for steroids,” Lorenzo says, “but we know that patients who get remdesivir can experience faster resolution of symptoms, shorter duration of hospitalization, and be less likely to need a ventilator.”
Controversy Over Convalescent Plasma
Plasma is the part of the blood that carries antibodies against viruses. In this case, the treatment uses plasma donated by survivors of COVID-19. The idea is that COVID-19 survivors have antibodies that fight the virus. Through plasma, doctors can pass those virus-fighting antibodies onto others struggling to fight the illness.
The concept dates back to at least the 1918 Spanish flu pandemic. But it’s unclear just how helpful it is in COVID-19. There hasn’t been a large, randomized, controlled clinical trial to compare the effects of convalescent plasma to placebo. Some trials are currently enrolling volunteers.
“The evidence for convalescent plasma is really weak,” Lorenzo says. “Not all plasma is equal. Not all plasma has high titers [high concentration of antibodies], and not all antibodies neutralize the virus. We’re using it, but it’s still not clear whether it’s effective or not.”
To Intubate or Not
Some critical care doctors may be holding off on intubating patients and putting them on a mechanical ventilator a little longer than they did earlier in the pandemic. Intubation requires heavy sedation and care in the ICU. Early in the pandemic, when doctors saw that patients were progressing in their need for oxygen, many erred on the side of caution and put patients on a ventilator sooner rather than later.
At the time, before doctors knew the benefits of steroids and remdesivir, the thought was that the patient would escalate and eventually need the ventilator no matter what.
“So if we did it early, rather than waiting until it was an emergency, when we could take our time donning the personal protective equipment, we would also reduce the risk of exposure to our health care workers,” Lorenzo says.
Doctors were also concerned that oxygen delivered through a tube in the nose – a step below a mechanical ventilator — could push the virus out into the air and increase exposure risk for health care workers, too.
“But we now know that in some patients, if we give the steroids and remdesivir a little bit more time, and allow them to escalate a little further along with high-flow nasal [oxygen], we might just squeak by and not have to put them on a ventilator,” Lorenzo says.
In Stanford’s ICU, Lorenzo says, they are now confident their staff are protected. “The risk of aerosolization of the virus is real. But we now know that our health care provider infection rate is low. So if we maintain our full PPE guidelines, then the risk of transmission is low, and we might be able to prevent the patient from escalating to a ventilator.”
New research shows this may be a safe risk to take. A recent study found that there was no difference in survival rates among COVID-19 patients who went directly on a ventilator and those who were put on nasal oxygen first.
Prone to Recover Faster
Some patients on ventilators may recover faster by spending some time each day lying prone, or face down. It doesn’t work for everyone. But for those who benefit, the idea is that the face-down position may distribute oxygen more evenly throughout the lungs. Long before COVID-19, critical care providers flipped sedated patients on ventilators onto their stomachs in order to get more oxygen into their lungs.
But since the pandemic, some ICUs are trying it on patients who are awake and perhaps on the way to needing a ventilator. Numerous clinical trials in progress are examining the benefits for patients who are not yet on a ventilator but struggling to get oxygen.
“For some patients, the oxygen level goes up, but it’s not universal,” Kaufman says. “And soon after you stop lying on your stomach, the oxygen goes back down.”
On the road to finding what works, health care providers have thrown out many things that proved not to work, too.
“A lot of people were talking about hydroxychloroquine,” Lorenzo says. “But we now know, unequivocally, that we shouldn’t be using it. It doesn’t work. And it probably can cause more harm than good.”
They’ve learned what works and what doesn’t more quickly through unprecedented collaboration with their co-workers and frontline health care workers around the globe.
Under “normal” circumstances, researchers tightly guard data until it is published. “Now, some of these trials may release unpublished data if they feel that the benefit is real and substantial,” Lorenzo says.
Social media groups for critical care doctors, he says, are also more active than ever.
Kaufman is part of an email chain with pulmonologists and critical care doctors from all over the world. Many are in Europe and got intensive experience with COVID-19 months ahead of doctors in the U.S. “To be connected with some of the worldwide masters in mechanical ventilation who are at some of the hardest hit cities in the world is an amazing privilege. It’s like sitting at the foot of Sophocles, learning from the ancient masters,” he says.
But for all they’ve learned, much is still unknown. Doctors still don’t understand why some patients get through the virus after a week of mild symptoms while others escalate to a ventilator in the same amount of time. “We still don’t know how patients progress in this disease,” Lorenzo says.
But after a frenzied springtime in which many health care providers tried anything that might work, Lorenzo says, “We have learned from this pandemic that we can’t relax our scientific rigor. We have to abide by the same process of peer-reviewed clinical trials that we normally do or we can harm patients.”
Published at Thu, 10 Sep 2020 20:18:25 +0000