COVID-19 rebound
The study also reported on the phenomenon of COVID-19 rebound (recurrence of symptoms and test positivity after regimen completion) after oral outpatient SARS-CoV-2 treatment. “This [COVID-19 rebound] is a downside to treatment,” he said. COVID rebound was not infrequent: A total of 25 (8%) of 318 patients who received oral outpatient treatment had documented COVID-19 rebound.
“It was reassuring because we found no one who had rebound progressed to have severe COVID-19,” Dr. Sparks said. “On the other hand, [rebound] happened pretty frequently in our data, as 8% of patients are documented to have it.”
Dr. Sparks said he and coinvestigators speculate that more patients in the cohort may have experienced COVID-19 rebound but did not communicate this to their health care providers, and, as such, it was not documented in the medical record. The potential development of COVID-19 rebound “is something to counsel your patients about.” COVID-19 rebound is a phenomenon that is being most commonly observed with nirmatrelvir-ritonavir as outpatient treatment.
Possible confounding factors in study
Katie Bechman, MBChB, clinical lecturer in rheumatology at King’s College London, who coauthored an accompanying editorial about the study and its findings, pointed out that the study is limited by its observational design.
Dr. Katie Bechman
“With any study that looks at the efficacy of treatment, especially in an observational cohort, you’re going to have to consider the unmeasured confounding and the difference between these two groups,” Dr. Bechman said. “I know that they did try to adjust for that in this study, but there’s always going to be factors that we can’t [control for]. That is something that needs to be considered. I think that’s always something we need to consider when we’re looking at observational data.”
In lieu of a randomized, controlled trial, Dr. Bechman noted that the study and its associated findings serve as “the best data we have,” and she described the results as “very informative and positive.”
She added that the large number of patients represents a strength of the study, as does the robust method employed for identifying which patients had COVID-19.
The learnings from this study with respect to outpatient treatment can be applied to more common illnesses that patients with rheumatic disease may develop, such as the flu, according to Dr. Bechman.
“One of the positive aspects from this pandemic is that we’ve learned a huge amount about how best to treat certain viruses and prevent them in patients,” she said. “It would be worth thinking towards the future, what we can do for illnesses that we see very commonly in these populations. There may be treatment regimens that we haven’t really considered until now. You could hypothesize that in the next couple of years, if we have an influenza breakout, that we should be providing some prehospital antiviral treatment to patients, especially the ones that are at high risk.”
The study was conducted without outside funding. Dr. Sparks has received research support from Bristol-Myers Squibb and consulted for AbbVie, Amgen, Boehringer Ingelheim, Bristol-Myers Squibb, Gilead, Inova Diagnostics, Janssen, Optum, and Pfizer unrelated to this work. Dr. Bechman reported no relevant financial relationships.
A version of this article first appeared on Medscape.com.