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Rationale: Traumatic brain injury (TBI) leads to neurological impairment, with no satisfactory treatments available. Classical ketogenic diets (KD), which reduce reliance on carbohydrates and provide ketones as fuel, have neuroprotective potential, but their high fat content reduces compliance, and experimental evidence suggests they protect juvenile brain against TBI, but not adult brain, which would strongly limit their applicability in TBI. Methods: We designed a new-KD with a fat to carbohydrate plus protein ratio of 2:1, containing medium chain triglycerides (MCT), docosahexaenoic acid (DHA), low glycaemic index carbohydrates, fibres and the ketogenic amino acid leucine, and evaluated its neuroprotective potential in adult TBI. Adult male C57BL6 mice were injured by controlled cortical impact (CCI) and assessed for 70 days, during which they received a control diet or the new-KD. Results: The new-KD, that markedly increased plasma Beta-hydroxybutyrate (β-HB), significantly attenuated sensorimotor deficits and corrected spatial memory deficit. The lesion size, perilesional inflammation and oxidation were markedly reduced. Oligodendrocyte loss appeared to be significantly reduced. TBI activated the mTOR pathway and the new-KD enhanced this increase and increased histone acetylation and methylation. Conclusion: The behavioural improvement and tissue protection provide proof of principle that this new formulation has therapeutic potential in adult TBI.
Correctly eliciting and interpreting physical examination (PEx) signs contributes to successful diagnosis and is fundamental to patient care. A significant decline in the time spent acquiring these skills by medical students, and the decreased ability to elicit and recognise signs is widely acknowledged. However, organising teaching to counteract this in the busy clinical environment is challenging. We evaluated the prior exposure to clinical signs, and experience of examination teaching among a cohort of final-year medical students. Following this, we assessed the utility of a structured circuit-based approach (Signs Circuits) using hospital inpatients and junior doctors to provide high-yield PEx teaching and overcome these limitations.
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