Debilitating, pervasive symptoms
Findings from an international survey of 3,762 respondents that was published on April 21 in medRXiv underscore that PASC occurs predominantly in middle-aged women (78.9% were women; 31% were aged 40-49 years; 25.0% were aged 50-59 years). For the most part, it manifests similarly among people with prior confirmed or suspected SARS-CoV-2 infections. In the study, symptoms were reported in both cohorts well past the initial infection; symptoms persisted past 90 days in 96% of patients and for at least 6 months in 65.2%.
Similarly, a recent study showed that 68% of patients who were enrolled in Mayo Clinic’s CARP as of June 2020 were women, middle aged (mean age, 45 ± 14.2 years), and presented roughly 3 months (94.4 ± 65 days) post diagnosis. Of these patients, 75% had not been previously hospitalized.
In both studies, fatigue and cognitive dysfunction were consistently cited as the most debilitating and pervasive manifestations lasting more than 6 months. Others included postexertional (physical or mental) malaise, sensorimotor symptoms, headaches, and memory problems.
Reports of even more severe neurologic first-time diagnoses are emerging. Findings from the Lancet Psychiatry study showed there was a small but clinically relevant risk for a range of conditions that included intracranial hemorrhage (0.14%; 95% CI, 0.10-0.20), ischemic stroke (0.43%; 95% CI, 0.36-0.52), parkinsonism (0.07%; 95% CI, 0.05-0.12), and nerve root/plexus disorders (2.69%; 95% CI, 2.51-2.89).
Dr. Toledano noted that he’s also seen patients who developed autonomic/small-fiber dysfunction. Preliminary data from a retrospective chart review suggest that the most likely diagnosis is orthostatic intolerance without tachycardia or hypotension.
In the study, 63% (17) of the 27 participants who met the inclusion criteria had abnormal results on function testing, but Composite Autonomic Severity Score results indicated mostly mild disease (sudomotor range, 0-3 [median, 0]; cardiovagal, 0-3 [median, 0]; cardiovascular adrenergic, 0-4 [median, 0]).
“The pattern that’s emerging is consistent with deconditioning,” Dr. Toledano said. “However, a small proportion of patients do have evidence of damage to the nervous system, which is something we’ve seen with other viruses.”
Proliferation of long-COVID clinics
A few of these patients with orthostatic intolerance developed postural tachycardia syndrome or experienced exacerbations of preexisting sensory or autonomic small-fiber neuropathies. “These post-viral, autonomic neuropathies tend to be self-limiting, but we’re starting to see different levels of involvement,” Dr. Toledano explained. At present, causality and/or underlying mechanisms are unclear.
Speaking on behalf of the American Academy of Neurology, Dr. Sacco acknowledged the challenges that lie ahead. “Like any neurological symptom that continues to affect a patient’s quality of life, you may need to seek the expertise of a neurologist. The only issue is that some may still not be sure exactly what to do; we don’t have all the data yet,” he said.
On the flip side, he pointed to the lessons of the past year and how quickly health care systems were able to pivot to deal with the pandemic and critically ill patients, then pivot again to disseminate vaccines, and how they are pivoting yet again to address PASC.
Across the nation, numerous hospitals and health care systems and even small private clinics have launched clinics that focus on long-COVID, including Mayo.
The program has a multidisciplinary, collaborative framework and offers both face-to-face and video telemedicine consultations. The latter are geared toward ensuring that under-resourced populations can access needed care and assistance.
“At Mayo, we have a centralized triage system to help target patients’ visits so that appropriate subspecialties and studies can be preordered,” explained Dr. Toledano. During these visits, patients are assessed for underlying conditions and possible signs of decompensation, as well as functional and physical needs and psychosocial challenges. Thereafter, patients enter either CARP, which offers active rehabilitation for up to 3 months after resolution of the acute infection, or the Post-COVID Care Center, which focuses on patients whose condition is not improving or who are demonstrating signs of central sensitization.