Case report
Marathon related death due to brainstem herniation in rehydration-related hyponatraemia: a case report
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* Corresponding author: Axel Petzold a.petzold@ion.ucl.ac.uk
1 The Tavistock Intensive Care Unit, The National Hospital for Neurology and Neurosurgery, Queen Square, London, WC1N 3BG, UK
2 The Department of Neuroimmunology, The Institute of Neurology, Queen Square, London, WC1N 3BG, UK
Journal of Medical Case Reports 2007, 1:186 doi:10.1186/1752-1947-1-186
Published: 28 December 2007Abstract
Introduction
Identifying marathon runners at risk of neurological deterioration at the end of the race (within a large cohort complaining of exhaustion, dehydration, nausea, headache, dizziness, etc.) is challenging. Here we report a case of rehydration-related hyponatraemia with ensuing brain herniation.
Case presentation
We report the death of runner in his 30's who collapsed in the recovery area following a marathon. Following rehydration he developed a respiratory arrest in the emergency room. He was found to be hyponatraemic (130 mM). A CT brain scan showed severe hydrocephalus and brain stem herniation. Despite emergency insertion of an extraventricular drain, he was tested for brainstem death the following morning. Funduscopy demonstrated an acute-on-chronic papilledema; CSF spectrophotometry did not reveal any trace of oxyhemoglobin or bilirubin, but ferritin levels were considerably raised (530 ng/mL, upper reference value 12 ng/mL), consistent with a previous bleed. Retrospectively it emerged that the patient had suffered from a thunderclap headache some months earlier. Subsequently he developed morning headaches and nausea. This suggests that he may have suffered from a subarachnoid haemorrhage complicated by secondary hydrocephalus. This would explain why in this case the relatively mild rehydration-related hyponatremia may have caused brain swelling sufficient for herniation.
Conclusion
Given the frequency of hyponatraemia in marathon runners (serum Na <135 mM in about 13%), and the non-specific symptoms, we discuss how a simple screening test such as funduscopy may help to identify those who require urgent neuroimaging.