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Long COVID

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Long COVID, also known as chronic COVID syndrome (CCS) and long-haul COVID,[1][2][3] is the long-term sequelae of coronavirus disease 2019 (COVID-19). These symptoms persist after the usual convalescence period. These long-term symptoms include fatigue, headaches, shortness of breath, anosmia (loss of smell), muscle weakness, low fever, cognitive dysfunction (brain fog), and hair loss.

Somewhere between 10 and 20 percent of people who have been diagnosed with COVID-19 report experiencing a range of symptoms which last longer than a month. About 2%[4] of people have report having symptoms which last longer than 12 weeks, which is called post-COVID-19 syndrome. Sufferers of long COVID are often called long-haulers.

Studies are under way into various aspects of long COVID, but as of December 2020 it is too early to draw conclusions, although one study has suggested risk factors for developing the illness. Health systems in some countries or jurisdictions have been mobilised to deal with this group of patients by creating specialised clinics and providing advice.

As "Long COVID" can also arise in young, healthy people[5][6] and even professional athletes[7] even if acute disease only led to minor symptoms, preventing Coronavirus infection and mastering the pandemic through suited measures including social distancing[8], source control[9], personal protective equipment[10] and vaccination has the potential to contribute significantly to long term population health, beyond the survival benefit for the high risk population.

While "Long COVID" is observed after acute Covid-19, it has not been reported after Covid vaccination, with over 100'000 participants included in vaccine trials by December 2020[11][12][13].

Definitions

The British National Institute for Health and Care Excellence (NICE) divides COVID-19 into three clinical definitions:

  • acute COVID-19 for signs and symptoms during the first 4 weeks after infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2),
  • new or ongoing symptoms 4 weeks or more after the start of acute COVID-19, which is divided into:
    • ongoing symptomatic COVID-19 for effects from 4 to 12 weeks after onset, and
    • post-COVID-19 syndrome for effects that persist 12 or more weeks after onset.

NICE describes the term long COVID, which it uses "in addition to the clinical case definitions", as:[14]

commonly used to describe signs and symptoms that continue or develop after acute COVID-19. It includes both ongoing symptomatic COVID-19 (from 4 to 12 weeks) and post-COVID-19 syndrome (12 weeks or more).

— National Institute of Health and Clinical Excellence

NICE defines post-COVID-19 syndrome as:[14]

Signs and symptoms that develop during or after an infection consistent with COVID‑19, continue for more than 12 weeks and are not explained by an alternative diagnosis. It usually presents with clusters of symptoms, often overlapping, which can fluctuate and change over time and can affect any system in the body. Post‑COVID‑19 syndrome may be considered before 12 weeks while the possibility of an alternative underlying disease is also being assessed.

— National Institute of Health and Clinical Excellence

Description and incidence

As time passed, from the first reports of the disease in December 2019 through the spread of the COVID-19 pandemic into 2020, it started becoming clear that COVID-19 was a long-term illness for many people,[15][16] seen in people who had a mild or moderate initial infection[17] as well as those who were admitted to hospital with more severe infection.[18][19][20]

Some early studies suggest that between 1 in 5 and 1 in 10 people with COVID-19 will experience symptoms lasting longer than a month.[15][18] An early analysis by the United Kingdom's National Institute for Health Research suggests that ongoing long COVID symptoms may be due to four syndromes: permanent damage to the lungs and heart, post-intensive care syndrome, post-viral fatigue syndrome, and continuing COVID-19 symptoms.[21][22][15][23][24]A November 2020 study concluded that survivors of COVID-19 appear to be at increased risk of psychiatric sequelae[25] – 20% of those infected are diagnosed with a psychiatric disorder within 90 days, with anxiety, depression and insomnia being most common.[26]

A majority (up to 80%[27]) of those who were admitted to hospital with severe disease experience long-term problems including fatigue and shortness of breath (dyspnoea).[28][15][29] Patients with severe initial infection, particularly those who required mechanical ventilation to help breathing, are also likely to suffer from post-intensive care syndrome following recovery.[18]

As of December 2020 an estimated 200,000 people in the UK are suffering from Long Covid.[30]

Terminology

Long COVID is a patient-created term which was reportedly first used in May 2020 as a hashtag on Twitter by Elisa Perego.[31][32]

Sufferers are often referred to as long-haulers.[16][33][34][35][36][37][38][39]

Symptoms

Symptoms reported by people with long COVID include:[40][36][38]

  • Extreme fatigue
  • Long lasting cough
  • Muscle weakness
  • Low grade fever
  • Inability to concentrate (brain fog)
  • Memory lapses
  • Changes in mood, sometimes accompanied by depression and other mental health problems
  • Sleep difficulties
  • Headaches
  • Joint pain
  • Needle pains in arms and legs
  • Diarrhoea and bouts of vomiting
  • Loss of taste and smell
  • Sore throat and difficulties to swallow
  • New onset of diabetes and hypertension
  • Skin rash
  • Shortness of breath
  • Chest pains
  • Palpitations
  • Hair loss

Risk factors

According to a King's College London study reported on 21 October 2020 (but not yet peer-reviewed[4]) risk factors for long COVID may include:[41][42]

  • Age – particularly those aged over 50
  • Sex – being a woman (in the younger age group)
  • Excess weight
  • Asthma
  • Having more than five symptoms in the first week of COVID-19 infection (e.g. cough, fatigue, headache, diarrhoea, loss of sense of smell)

Studies

A number of studies are currently analysing the long-term effects of the virus on some individuals. A wide range of longer-term damage to other organs has been found, including the nervous system, and possibly kidneys, liver, and gastrointestinal tract. Symptoms such as decreased lung and cardiac function and decreased exercise capacity have frequently been recorded. In addition, a range of symptoms of as yet unknown aetiology, such as fatigue, joint pain, "brain fog", and fever, have led to comparisons with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), although distinct from such a diagnosis, which is dependent on other criteria. Doctors are hoping to find specific causes for the symptoms experienced by COVID-19 long-haulers, who are often young, previously fit and healthy people, as their treatment will differ depending on the aetiology, which could be lingering infection, autoimmune abnormalities, lung or heart damage, inflammation or other reasons.[43][44]

A study by King's College London found that an estimated 10 per cent of COVID-19 sufferers in the UK did not recover within three weeks, and about 250,000 people experienced symptoms for 30 days or more.[45]

Timeline

In April/May 2020, 143 patients who had been hospitalised in acute care were followed up in Rome, Italy, and 87.4% reported at least one persisting symptom, particularly fatigue and dyspnoea.[39][46]

The University of Leicester and the University Hospitals of Leicester NHS Trust are undertaking a major study into the long-term health effects of COVID-19 as of August 2020.[45][47][48]

On 1 September 2020 The Lancet Infectious Diseases published an article by 15 doctors summarising the most common complaints of people recovering from COVID-19, who had experienced different degrees of severity during the acute phase, seen in their clinical practice. They reported an observational study of 100 recovering/recovered patients published in July 2020,[49] which found that 78 of these patients had abnormal findings on cardiovascular MRI (median 71 days after diagnosis), and 36 of those experienced dyspnoea and unusual fatigue. While long-term sequelae of the disease were as yet unknown, the authors said that research into aspects of these long-term effects is needed, including prediction of which patients may suffer such effects, management of the acute phase which may help to avert the symptoms, phases of the immunological response in these patients, possible genetic determinants, and treatments for the symptoms.[40]

On 9 November 2020, a study found that the COVID-19 survivors had around a 18.1% chance of developing a psychiatric disorder within 90 days of COVID-19, while 5.8% of these patients were receiving a psychiatric diagnosis for the first time.[25] On 9 November 2020, Dr. Anthony Fauci said "Between 25% and 35% of COVID-19 patients have lingering symptoms such as fatigue, shortness of breath, muscle aches, sleep disturbances and 'brain fog'."[50]

Health system responses

Australia

In October 2020, a guide published by the Royal Australian College of General Practitioners (RACGP) says that ongoing post-COVID-19 infection symptoms such as fatigue, shortness of breath and chest pain will require management by GPs, in addition to the more severe conditions already documented.[27]

United Kingdom

In Britain, the National Health Service has set up specialist clinics for the treatment of long COVID.[51] The four Chief Medical Officers of the UK were warned of academic concern over long COVID on 21 September 2020 in a letter published in The BMJ and written by Trisha Greenhalgh.[52] The letter was signed by academics including David Hunter, Martin McKee, Susan Michie, Melinda Mills, Christina Pagel, Stephen Reicher, Gabriel Scally, Devi Sridhar, Charles Tannock, Yee Whye Teh, and Harry Burns, former CMO for Scotland.[52] In October 2020, NHS England's head Simon Stevens announced the NHS had committed £10 million to be spent that year on setting up long COVID clinics to assess patients' physical, cognitive, and psychological conditions and to provide specialist treatment. Future clinical guidelines were announced, with further research on 10,000 patients planned and a designated task-force to be set up, along with an online rehabilitation service[53] – "Your Covid Recovery".[54]

In December 2020, University College London Hospitals (UCLH) opened a second Long Covid clinic at the National Hospital for Neurology and Neurosurgery for patients with post-Covid neurological issues. The first clinic opened in May, primarily focused on respiratory problems, but both clinics also refer patients to other specialists where needed, including cardiologists, physiotherapists and psychiatrists.[55]

Public response

Multiple groups of long COVID sufferers have joined groups on social media sites that are either internationally based or on smaller geographical areas.[56][57] In many of these groups individuals post about frustrations with living with their symptoms and believed dismissal by medical professionals.[57]

See also

References

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Further reading