Electrolyte abnormalities, unhelpful reassurance, and the essence of tremor - Editors' Highlights August 2025

Encephalitis, at its simplest, is inflammation of the functional tissue of the brain. With a wide range of infectious and non-infectious causes, it can be difficult to differentiate from other forms of encephalopathy. Yet a growing evidence base suggests that the time to treatment is a key determinant in patient outcomes, making a rapid diagnosis of high importance. In this editors' choice podcast, PN podcast editor Dr. Amy Ross Russell interviews Dr. Yun Huang¹ ² and Prof. Benedict Michael¹ ², on the paper, "Suspected encephalitis in adults", published in the October 2026 edition of the journal. They highlight the importance of collateral history in encephalitis patients, and the strong influence of the patients immune status. Common treatments are discussed, including the risks and benefits of preemptive use of acyclovir, and the empirical application of steroids. Looking forward, testing methods such as metagenomics show promise in handling novel pathogens. Links:

A rare sight on the podcast: a paper from the cutting edge of practice, with the novel use of CAR-T cells in treating neurological diseases. Editors Phil Smith and Geraint Fuller bring a selection of papers from the October 2026 issue of the journal to discuss. Returning to the more commonplace, they present a how-to on conversations around lower back pain. There's the editors' choice for the issue: a majestic paper on suspected encephalitis, as well as non-motor symptoms in Parkinson's, a review of the 2024 McDonald criteria for MS diagnosis, and pitfalls to avoid with oxygen desaturation. Read the issue: https://pn.bmj.com/content/26/5/413 Please subscribe to the Practical Neurology podcast on your favourite platform to get the latest podcast every month. If you enjoy our podcast, you can leave us a review or a comment on Apple Podcasts (https://apple.co/3vVPClm) or Spotify (https://spoti.fi/4baxjsQ). We'd love to hear your feedback on social media - @PracticalNeurol. Production and editing by Brian O'Toole. Thank you for listening.

Diet continues to be a growing presence in the neurological diagnoses cropping up for the Case Reports team, returning again after its previous appearance with gastric sleeves. The first case (1:25), from UCLH in London, is that of a 49-yo woman, presenting with a history of worsening intermittent headaches and blurred vision. Metabolic testing identified high values for homocysteine and methyl malonic acid. Further probing of the patient's history revealed a previous eating disorder and recent dietary restriction after a bereavement, with subsequent weight loss. She was treated with a course of vitamin supplementation for B2, B6, B9 (folate), and B12, but re-presented again with persistent symptoms. https://pn.bmj.com/content/26/4/400 The second case (22:19) comes from Cork, Ireland. A 19-yo woman presents with gradual onset headache, vomiting and unsteadiness. Her temperature is read at 38.4 ℃, prompting consideration of brain stem infections such as Lyme disease, tuberculosis and listeria. The MRI brain scan returned some unusual findings. https://pn.bmj.com/content/26/4/395 This episode is the last appearance on the podcast for our dear discussant Dr. Ruth Wood, who - by now an able seaman - is disembarking for new shores. The paper on aquatic neurology may be the high water mark of her years on the podcast, but each episode was a pearl in its own right. Best wishes, Ruth!Further reading:

Space, the final frontier. A new domain for the podcast opens, as we learn how astronauts are preparing for Mars transit by lying in bed. But first - the ophthalmology department refers a patient with a swollen optic disc. When is it papilloedema, and when is it not? And what does that have to do with Martian vistas? In this editors' choice podcast, PN podcast editor Dr. Amy Ross Russell interviews Prof. Susan Mollan¹ ², last author of the paper, "How to diagnose papilloedema", published in the August 2026 edition of the journal. From crashing visual loss to pulsatile tinnitus, they discuss the signs in a patient history which can build a picture of their condition. There's a practical walkthrough of the key elements of the eye exam, as well as discussion of the modern tools that are available to assist. Sometimes backup is needed, and Prof. Mollan explains when it's the right time to call the ophthalmologists back, and how to buy yourself extra time on a late Friday shift. Links:

The latest highlights from the journal will deliver confidence when managing complex everyday presentations. In this podcast for the August 2026 issue of Practical Neurology, co-editors Phil Smith and Geraint Fuller present the key highlights from a cracking 100-page edition spanning the full spectrum of neurological care. They examine how to accurately diagnose papilloedema and distinguish swollen optic discs from pseudo-swelling or other mimics. Next, they discuss a comprehensive guide to the Parkinson's disease follow-up consultation, focusing on non-motor symptoms, lifestyle advice, and long-term management. The editors also explore a structured approach to assessing neurogenic bladder, bowel, and sexual dysfunction, before covering the key clinical clues and investigations for evaluating pulsatile tinnitus. They also review the intricate link between chronic kidney disease and cognitive impairment, and finish with a critical look at the practical uses and limitations of subhairline EEG monitoring in neurocritical care. Read the issue: https://pn.bmj.com/content/26/4 Please subscribe to the Practical Neurology podcast on your favourite platform to get the latest podcast every month. If you enjoy our podcast, you can leave us a review or a comment on Apple Podcasts (https://apple.co/3vVPClm) or Spotify (https://spoti.fi/4baxjsQ). We'd love to hear your feedback on social media - @PracticalNeurol. Production and editing by Brian O'Toole, Nick Currey and Letícia Amorim. Thank you for listening.