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Patients with a condition that causes blood vessels in the brain to form an abnormal tangle could be helped by the findings of new research.
An international patient trial suggests that the safest way of managing arteriovenous malformations (AVM) of the brain is to treat the patient's symptoms only, and not the AVM.
People with an AVM - causing disrupted blood flow in the brain - are three times more likely to suffer stroke from the AVM bursting or die within three years if the tangled vessels are treated, researchers found.
An AVM occurs when blood passes directly from arteries to veins - normally arteries carry blood from the heart to the brain, while veins take blood back in the opposite direction.
More than 200 patients with a brain AVM were followed for 33 months in a trial, which was led in the UK by the University of Edinburgh.
The risks linked to treatment of AVMs were much higher than those associated with leaving them alone, the trial found.
The findings build on previous research showing that annually, only one in every hundred patients with a brain AVM suffer a stroke, and the other 99 per cent do not.
Doctors say that if a brain AVM ruptures, the initial effects are often mild.
Professor Rustam Al-Shahi Salman, of the University of Edinburgh's Division of Clinical Neurosciences, said: "We have found clear evidence of harm to patients in the short term from treatments to obliterate AVMs that have never bled in the past. Observation of trial participants must continue for at least another five years to find out if this difference persists."
The study, which is published in The Lancet, was funded by the National Institute of Neurological Disorders and Stroke, which is part of the National Institutes of Health in the USA.
Medical management with or without interventional therapy for unruptured brain arteriovenous malformations (ARUBA): a multicentre, non-blinded, randomised trial, Authors: Prof J P Mohr MD, Prof Michael K Parides PhD, Prof Christian Stapf MD, Ellen Moquete RN, Claudia S Moy PhD, Jessica R Overbey MS, Prof Rustam Al-Shahi Salman FRCP, Prof Eric Vicaut MD, Prof William L Young MD, Prof Emmanuel Houdart MD, Prof Charlotte Cordonnier MD, Prof Marco A Stefani MD, Andreas Hartmann MD, Prof Rüdiger von Kummer MD, Prof Alessandra Biondi MD, Prof Joachim Berkefeld MD, Catharina J M Klijn MD, Kirsty Harkness MD, Richard Libman MD, Xavier Barreau MD, Prof Alan J Moskowitz MD, The Lancet, Early Online Publication, 20 November 2013 doi:10.1016/S0140-6736(13)62302-8
University of Edinburgh
Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
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