1. What is the impact of ketogenic diet on mitochondrial function?
The ketogenic diet (KD) improves seizure control in patients with drug-resistant forms of epilepsy, and its mechanisms of action remain incompletely understood. KD is a high-fat, low carbohydrate diet that mimics the fasting state by maintaining metabolic ketosis. Some mechanisms whereby KD might confer neuroprotection and antiseizure effects revolve around its impact on mitochondrial function. Ketones are more energy efficient than glucose and can stimulate mitochondrial biogenesis and enzymatic activity. By reducing the formation of reactive oxidant species, ketosis can also protect against glutamate-mediated apoptosis and necrosis. Ketones can also enhance the conversion of excitotoxic glutamate to the inhibitory gamma-aminobutyric acid (GABA) neurotransmitter. Mitochondrial dysfunction contributes to both epileptogenesis and ongoing seizure susceptibility. Increased mitochondrial levels of GSH might contribute to a change in seizure susceptibility and possible anticonvulsant role for GSH. GSH biosynthesis increases after 3 weeks on KD, making it a target worth studying with respect to potential anticonvulsant effects. In a cross-sectional study, KD patients had higher levels of brain GSH compared to healthy controls. Other cerebral ketone bodies such as acetone have also been suggested to potentially contribute to seizure control in epilepsy patients treated with ketogenic diet. In a small pilot study, GSH levels were measured in two patients with epilepsy before and after intervention with the ketogenic diet.
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2. What is the definition of drug-resistant epilepsy in this study?
In this study, drug-resistant epilepsy is defined as having at least two or more seizures per month despite at least two anticonvulsant medication trials. This criterion was used for recruitment purposes. The study aims to evaluate the effectiveness of the ketogenic diet and modified atkins diet (MAD) in reducing seizure burden at specific time intervals, which have been shown to be significant in past clinical trials.
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3. What MR scanner and spectroscopy technique were used for MRS acquisition?
The MR scanner used for MRS acquisition was a 3 Tesla clinical MR scanner (GE Healthcare; Chicago, IL, USA). The spectroscopy technique employed was single-voxel point-resolved spectroscopy (PRESS). The echo time (TE) was set at 35 ms, with a repetition timer of 2 seconds and 128 averages. This technique allowed for the precise acquisition of MR spectroscopy data, enabling the analysis of metabolic changes in specific brain regions.
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4. What is the age and gender of Patient 1?
Patient 1 is a 42-year-old male. He has focal unaware seizures originating from the left temporal lobe. The patient underwent neo-cortical resection of the inferior-middle temporal gyri in 2012. Currently, he is on medications such as levetiracetam, lamotrigine, and lacosamide. Additionally, he uses an artisanal cannabidiol mixture. Patient 1 experiences 3 to 5 breakthrough seizures monthly, each lasting between 1 to 5 minutes. The patient started the ketogenic diet to manage his seizures.
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