What Are the Characteristics of Persistent Acute and Chronic Symptoms After Covid?

One in Every 5 Patients Continues to Have Symptoms After Covid

Covid-19 disease caused by the novel coronavirus (SARS-CoV-2) has affected more than 160 million people worldwide, and more than 3.4 million people have died as a result. As we try to understand SARS-CoV-2 infection, contrary to what is commonly known, positive cases are predicted to continue developing post-Covid-19 syndrome at a rate of more than 20% according to estimates.

What is post-Covid syndrome?

The medical condition caused by persistent symptoms, sequelae and other medical complications (problems) after recovering from Covid-19 disease is known as post-Covid syndrome in medical terminology.

What are acute and chronic post-Covid?

Post-Covid syndrome can be characterized, based on whether symptoms after their first observation last longer than 12 weeks, as an acute or chronic subtype. However, it is not yet understood whether chronic post-Covid is a continuation after acute Covid or a subtype of a separate disease with a different risk profile.

Clearly defining the characteristics of the post-Covid subtypes:

• Could be a very important step in enabling doctors to make the correct diagnosis after Covid
• Could be a very important step in counseling patients on how to manage their specific syndrome subtype.
• Could be a very important step in ensuring appropriate resource allocation to meet the specific healthcare needs associated with each subtype.

These goals could also be further supported by using surveillance programs after hospital discharge to help with predicting which patients are at greatest risk of developing post-Covid syndrome. It is therefore important to characterize the clinical features of acute and chronic post-Covid syndrome.

Characteristics of acute and chronic post-Covid syndrome

A study on this subject sought answers to the following questions.

1. What are the clinical features associated with acute and chronic post-Covid syndrome?
2. Which features predict the development of post-Covid syndrome?

Patients with acute post-Covid-19 syndrome have a broad range of persistent post-Covid symptoms. Fatigue and sleep disturbance were reported to be the most common of these symptoms, while fatigue, anxiety and shortness of breath were the most common symptoms in chronic post-Covid.

Anosmia (loss of smell) and fatigue being very common indicates that post-Covid syndrome involves multiple difficulties that trouble individuals.

The number of symptoms associated with chronic post-Covid is lower than after acute post-Covid. However, it appears that the severity of the initial infection or the burden of symptoms during the acute phase of the disease is associated with a greater likelihood of persistent post-Covid symptoms.  

Given the prevalence of respiratory symptoms during Covid-19 infection, respiratory symptoms in post-Covid syndrome are to be expected. Persistent respiratory difficulties are also consistent with previous SARS-CoV outbreaks, in which lung function difficulties associated with muscle weakness appeared 6 – 8 weeks after discharge.

Cardiac symptoms have also been reported in both acute and chronic post-Covid syndromes. Cardiovascular involvement on cardiac MRG (Magnetic Resonance Imaging) was observed in 78% of people who recovered from Covid-19 infection, regardless of pre-existing conditions, the severity and course of the initial infection, or the presence of cardiac symptoms.

The pathophysiology of post-Covid syndrome is not fully understood. Theories involving a hyperinflammatory state, oxidative stress, cytokine storm and DNA damage have been proposed, but further ongoing research into potential treatments has been needed.

Below are the 50 symptoms described for chronic post-Covid:

Coping with post-Covid

Multifaceted approaches are needed to cope effectively with post-Covid syndrome. Current practice consists of monitoring individuals through their self-reported symptoms and outpatient clinics. However, standardized monitoring and care are not yet available.

The Covid-19 pandemic has been immediately embraced in health technology, and technological innovations have enabled remote patient monitoring and assessment. With further advances, wearable technologies that allow remote monitoring of survivors of outbreaks such as Covid-19 may come into use.

- Related topic: The Latest in Wearable Technology and an Example Developed for COVID-19

In addition, noting the limited literature on predicting post-Covid syndrome, it is important not to overlook the need for advanced surveillance programs. Individuals with post-Covid syndrome may experience ongoing effects requiring long-term support. The public should also be informed about this issue. Policymakers should recognize post-Covid syndrome as a legitimate health condition and inform the public and clinicians about it. Specific approaches to improving the situation are needed to prevent problems in advance.

Can post-Covid syndrome be predicted?

In one study, people were called by telephone and invited to participate in surveys intended to identify post-Covid syndrome after Covid-19 infection. However, only a small proportion answered the calls, so the progression of symptoms over time unfortunately could not be predicted.

Another data collection system was based on identifying participants in long-term Covid groups on Facebook and inviting eligible people to answer surveys. However, this method also faced barriers such as technological literacy, risky selection and ascertainment bias. The predominantly female participation also reduced the ability to generalize from the resulting data. Finally, the literature on predicting post-Covid syndrome included limited studies that excluded severe Covid-19 cases and mostly involved young people and healthcare workers.

- Related topic: Covid-19 Recovery and Time to Death – In Mild, Moderate and Severe Disease

Prospectively designed studies with appropriate control arms are also needed to establish relationships between post-Covid syndrome and age. In particular, several studies did not include older populations at high risk of severe symptoms (including those in low- and middle-income countries), ethnicity, or the characteristics and severity of the initial acute infection (such as the need for intensive care or oxygen).

New terms

The systemic study also emphasized the need for new terms to take their place in the literature.

• Post-Covid syndrome: A term that will help homogenize future symptom data and allow accurate definitions for predicting this condition.
• Chronic post-Covid syndrome: It will allow more accurate identification of cases obtained from clinical datasets.

Conclusion

The applicability of current knowledge about post-Covid syndrome is limited by the quality of available data, a consequence of flaws in data collection and interpretation. Global collaboration is needed to better understand the prevalence, clinical features and prognosis of this new disease. Clinicians, policymakers and researchers should also focus on understanding its effects on individuals and communities.

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