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Terrifying Delirium Can Strike Hospitalized COVID-19 Patients

July 10, 2020 by Vicki Doe Leave a Comment

FRIDAY, July 10, 2020 (HealthDay News) — Intense breathing problems may be the most widely reported feature of COVID-19, but new research warns that coronavirus can also take aim at the brain.

Infection can trigger serious nerve damage, stroke, inflammation and even wild bouts of delirium.

In fact, a bizarre array of delusions plagued nearly a quarter of the 43 British COVID patients whose cases are detailed in a new report published July 8 in the journal Brain.

The cases were characterized as ranging from mild to critical, and included patients as young as 16 and as old as 85. All were handled at a London hospital this past April and May.

One patient was a middle-aged woman with no prior history of mental illness, who ended up hallucinating that lions and monkeys had entered her house. A 65-year-old woman — with a two-year history of burgeoning dementia — saw imaginary objects flying around her room and random people walking through her home.

Just last week, the New York Times published a report highlighting COVID-triggered cases of delirium among American patients. One patient — a 31-year old woman — said she had alternatively believed she was being burned alive one minute and turned into an ice sculpture the next.

Another patient in the Times report — an elderly man on a ventilator — said he thought he was being abducted and threatened, while confronting images of a rotating human head spiked with nails. And after just a short bout of sedation and intubation, a middle-aged male patient said he had visions of vampires, dead people, armed goons, and even the devil.

Exactly what is driving such flights of fancy in COVID patients?

In the context of coronavirus, “we do not yet know why delirium occurs,” said Michael Zandi. He's a co-senior author of the British study, and an honorary associate professor at University College London Queen Square Institute of Neurology.

But Zandi noted that “delirium may arise from low blood oxygen levels, for instance due to respiratory issues.”

A likely link to underlying lung problems was also cited by Dr. Larry Goldstein, chairman of the department of neurology and co-director of the Kentucky Neuroscience Institute at the University of Kentucky.

Inflammation, lack of oxygen may play a part

For one, Goldstein pointed out that all 10 of the patients who experienced delirium also had pulmonary infections. Still, in the context of COVID-19, he said delirium might be caused by “decreased blood oxygen, direct infection [and/or] drugs, among any number of other potential causes.”

As to whether COVID-triggered delirium might result from direct damage to the brain, Zandi noted that brain scans and spinal fluid analysis results “were largely normal” among those who struggled with delirium, adding to the mystery.

Even so, Zandi stressed that delirium wasn't the only neurological complication confronting COVID patients. In fact, many of those who did not experience delirium did develop brain inflammation disorders, including encephalitis. In some cases, those disorders were the main feature of the COVID experience, sometimes absent serious respiratory illness.

In fact, 12 of the patients were diagnosed with brain inflammation, the British team noted. Three-quarters of this group (nine patients) were diagnosed with a rare, potentially fatal, and largely pediatric condition known as ADEM (acute disseminated encephalomyelitis).

In addition, eight COVID patients suffered a stroke, while another eight suffered nerve damage. Most of the nerve damage cases involved Guillain-Barré syndrome, a rare disorder that unfolds when the body's own immune system runs amok and starts to attack the patient's nervous system.

Given that the British team found no evidence of the coronavirus in the cerebrospinal fluid of their patients, that may offer a clue as to what's actually afoot. It could signal that COVID-related brain complications –whether inflammation or delirium — are the product of an out-of-whack immune response.

Regardless, Zandi and his colleagues suggest that doctors should be vigilant for early signs of neurological trouble among their COVID patients, to intervene early and reduce the risk for long-term damage to the brain.

Could delirium during COVID infection lead to lasting trouble? Both Zandi and Goldstein said the jury is still out.

It all depends, said Goldstein. “Delirium can be transient, with no long-term consequences,” he said. But he cautioned that it can also have long-lasting effects when brought on by something like a small stroke. The ultimate impact of COVID-induced bouts of delirium will require more research, he said.

Meanwhile, Zandi suggested that brain inflammation is more likely to complicate COVID recovery than delirium, though “we know that some elderly people who experience delirium have poor outcomes and accelerated decline in memory function. For now, we do not know the long-term outcome of delirium in COVID-19.”

More information

There's more on COVID-19 symptoms at the U.S. Centers for Disease Control and Prevention.

SOURCES: Michael Zandi, Ph.D., honorary associate professor, University College London Queen Square Institute of Neurology, and consultant neurologist, National Hospital for Neurology and Neurosurgery, London; Larry Goldstein, M.D., chairman, department of neurology, and co-director, Kentucky Neuroscience Institute, University of Kentucky, Lexington; Brain, July 8, 2020

Copyright © 2020 HealthDay. All rights reserved.

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