New study finds two-thirds of severely affected anti-NMDAR encephalitis patients recover

A major international study, published in the prestigious journal The Lancet Neurology, has found that most patients left in a prolonged vegetative state by anti-NMDAR encephalitis can go on to make a meaningful recovery.

Background

Anti-NMDAR encephalitis occurs when the body’s own antibodies attack receptors in the brain and mainly affects children and young adults.

In the most severe cases, patients can spend long periods in intensive care, facing serious complications and profound uncertainty about whether recovery is still possible.

For families, that uncertainty can stretch on for years, carrying an enormous emotional, social, and practical burden.

The research

Led by Dr Mar Guasp and Professor Josep Dalmau at Hospital Clínic–IDIBAPS in Barcelona, with collaborators across 11 countries, the study followed 45 patients who had remained in a vegetative or near-vegetative state for at least nine months.

Patients were followed for an average of five years and some of the key findings were:

• Around two-thirds of patients achieved significant functional recovery.
• Patients spent a median of 399 days in a vegetative state before improving.
• About one in three made a complete recovery, returning to their former activities.
• Recovery sometimes came years after onset, and even after immunotherapy had stopped.
• Six patients (13% of the cohort) died and around a quarter were left with lasting disability.

The findings suggest that prolonged unconsciousness in this disease does not necessarily mean the brain has been permanently damaged.

The study is the largest of its kind to focus on this most seriously affected group.

Going forward

The authors say their results should change how and when doctors decide that a treatment has failed; and how carefully conversations about withdrawing life support are approached. Because recovery can be so delayed, current benchmarks for giving up on treatment may come too soon.

Thus, the researchers call for long-term studies, better prognostic tools, and clinical trials designed specifically for this condition, alongside multidisciplinary care that gives patients the time they need to recover. They further highlight the value of sustained, expert bedside care: the nurses, therapists, and medical teams who support these patients month after month.

There are some caveats to the study, however, such as the small retrospective sample and under-representation of paediatric patients. It is also important to note that recovery in the cohort was not universal.

Nevertheless, this research provides evidence that recovery is possible even after prolonged unconsciousness, offering hope to families affected by this form of autoimmune encephalitis.

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To view the original paper, click here.

To view our factsheet on anti-NMDAR encephalitis, click here.

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