Understanding Long COVID: A Public Health Concern

The Emergence of Post Acute Sequela of SARS-CoV-2 Infection (PASC)

In the aftermath of the COVID-19 pandemic, Post Acute Sequela of SARS-CoV-2 Infection (PASC), commonly referred to as Long COVID, has become a significant public health issue. Diagnosing long COVID can be challenging for healthcare providers, primarily due to the absence of a comprehensive list of symptoms.

NIH Study on Long COVID Symptoms

Researchers from the National Institutes of Health (NIH) have published a study identifying key symptoms associated with Long COVID. This study aids clinicians in determining whether patients might benefit from specialized Long COVID services.

Key Symptoms of Long COVID

Identifying the Most Prevalent Symptoms

A recent study featured in the Journal of the American Medical Association has cataloged 37 symptoms that are strongly linked to PASC. Led by Massachusetts General Hospital, the research highlighted twelve symptoms that were reported more frequently by Long COVID patients compared to those who had not contracted the virus. The twelve most common symptoms identified are:

– Abnormal movements
– Brain fog
– Changes in libido
– Changes in ability to smell/taste
– Chest pain
– Chronic cough
– Dizziness
– Gastrointestinal symptoms
– Heart palpitations
– Malaise
– Thirst
– Hair loss

Additional Symptoms

Other reported symptoms include shortness of breath, various pains (abdominal, back, foot, head, joint, muscle, skin, throat), anxiety, depression, fatigue, weakness, tremors, sleep apnea, sleep disturbances, swelling of legs, bladder issues, fever/chills/sweats, vision changes, hearing changes, skin rashes, skin color changes, and dental problems.

The researchers found that some symptoms tended to cluster together, suggesting the existence of subtypes of PASC, which may clarify the diverse effects experienced by those with Long COVID.

Defining PASC/Long COVID

Understanding the Condition

PASC is a chronic health condition that arises after infection with the SARS-CoV-2 virus. Typically, individuals recover from COVID-19 within days to weeks. However, some continue to experience lingering symptoms long after the acute phase of the infection has resolved. Symptoms may initially subside only to return at a later date, or new symptoms may emerge after recovery. Initially termed “COVID long haulers,” the condition is now widely recognized as Long COVID or PASC.

The RECOVER Initiative

Investigating PASC

To explore PASC further, the NIH has established the RECOVER initiative, bringing together a consortium of experts to study the condition’s nature, causes, and treatment options. While over 200 symptoms have been informally reported, a standardized definition of PASC is still in development. The RECOVER study involves over 9,500 participants from 85 locations across the United States.

This study took a unique approach by including individuals infected with the virus at various stages of the pandemic, as well as those who had never been infected. Researchers collected demographic and symptom data through remote surveys and in-person visits, comparing the most frequently reported Long COVID symptoms with those of individuals who had not contracted the virus.

Findings and Implications

The 37 symptoms identified were found to be more prevalent and severe among those who had experienced COVID-19. Researchers were also able to predict PASC diagnoses based on the number and intensity of symptoms reported.

Ongoing Research and Limitations

Continuing Developments

The list of symptoms associated with Long COVID is not exhaustive. Some patients may not exhibit any of the 37 listed symptoms yet still suffer from PASC. Ongoing research may refine the significance of certain symptoms and potentially add new ones.

Study Limitations

Limitations of this study include reliance on patient-reported data, the potential influence of other variables not accounted for, and the evolving nature of the PASC scoring system. Despite these challenges, the study lays a foundation for a working definition of PASC and the development of standardized care protocols.

References

– Thaweethai T, Jolley SE, Karlson EW, et al. Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection. JAMA. 2023;329(22):1934–1946. doi:10.1001/jama.2023.8823
– RECOVER. RECOVER: Researching COVID to Enhance Recovery. Accessed August 9, 2023. https://recovercovid.org/about
– (NIH) NIoH. Long COVID. Accessed August 11, 2023. https://covid19.nih.gov/covid-19-topics/long-covid