Explain a Dravet syndrome diagnosis and its medication rules to a family — long case / structured oral

Candidate instructions

You are the paediatric registrar in the epilepsy clinic. A 10-month-old boy has just had genetic testing confirm a pathogenic SCN1A variant, confirming Dravet syndrome after he presented with prolonged febrile hemiclonic seizures from six months of age and has developed myoclonic jerks and developmental slowing. You have fifteen minutes with his parents. They want to understand, in plain language: (1) what Dravet syndrome is and what the gene result means; (2) which medicines help and which must be avoided and why; (3) what to do for a prolonged seizure at home; and (4) what the future holds for his development. Explain with empathy, check understanding, and agree a clear plan. [2]

Encounter

Parent: "They said the gene test confirmed something called Dravet syndrome. What does that actually mean for him?" [2]

Registrar: "I know this is a lot to take in, so let us go through it step by step. Dravet syndrome is a specific type of epilepsy that begins in the first year of life, which is exactly what you saw — those long seizures with the fever that started around six months. It is caused by a change in a gene called SCN1A, and that result is what now confirms it. The gene change affects how some of the signalling cells in his brain work, and that is why he has been having the seizures and why his development has slowed a little recently. It is not something either of you caused, and it is not the result of anything you did or did not do." [2]

Parent: "So what medicines will help, and are there any that make it worse? Someone mentioned he should avoid certain drugs." [3]

Registrar: "That is exactly the right question, and it is the most important thing about Dravet syndrome. The medicine that forms the foundation is called sodium valproate, usually combined with a calming medicine called clobazam, and there are newer medicines — stiripentol, fenfluramine and cannabidiol — that we can add if we need to. The crucial rule is that he must avoid a family of medicines called sodium-channel blockers — names like carbamazepine, oxcarbazepine, lamotrigine and phenytoin. The reason is that his gene change weakens the calming cells in his brain, and those particular drugs weaken them further, so his seizures would actually get worse. I will give you a written list of the drugs to avoid and a medical alert, so that if he is ever treated by a doctor who does not know him, you can show them." [3]

Parent: "What do we do if he has another long seizure like that first one?" [3]

Registrar: "We will give you a clear written emergency plan. At home, if a convulsion goes on for five minutes, you give a medicine called midazolam into the inside of his cheek or as a nasal spray — I will show you the dose and technique, and it is weight-based, about 0.15 milligrams per kilogram. Then you call an ambulance. If the seizure is still going when you reach hospital, the team will follow the standard seizure ladder with oxygen and further medicines. The key is not to let a seizure run for a very long time, and to treat the fever early because fever is his main trigger. Avoid overheating — cool baths and very hot days can also set him off." [3]

Parent: "And what about his development? Will he catch up?" [2]

Registrar: "I want to be honest with you. Dravet syndrome does affect development over time — most children will have some degree of learning difficulty, and he may develop a slightly unsteady walk as he gets older. It is a lifelong condition. But there is real reason for hope as well: the newer medicines I mentioned have made a genuine difference to how often children seize and to their quality of life, and the earlier we control the seizures and avoid the wrong drugs, the better his outcome can be. He will have a team around him — neurology, his paediatrician, physiotherapy and occupational therapy, and school support — and we will review him regularly and adjust the plan as he grows." [2] [3]

Parent: "That is a lot to hold, but the list of drugs to avoid and the emergency plan help." [3]

Registrar: "I will write all of it down for you — the diagnosis, the medicines he takes, the drugs to avoid with the medical alert, the emergency midazolam dose, and our team's contact number. So that I have explained it well — can you tell me the two most important things about his medicines?" [3]

Examiner debrief

A strong candidate explains Dravet syndrome in plain, honest language — a genetic epilepsy of the first year caused by an SCN1A change, with prolonged febrile seizures and later developmental slowing — and then lands the single most important management rule: avoid sodium-channel blockers (carbamazepine, oxcarbazepine, lamotrigine, phenytoin) because they worsen the seizures by further suppressing the deficient inhibitory neurons. They explain the emergency plan with a concrete, weight-based midazolam dose and the fever-trigger avoidance, they are honest about the developmental outlook without being bleak, and they frame the newer therapies as a source of hope. They check understanding with teach-back and provide a written summary and a medical alert. Pitfalls include being vague about the drugs to avoid, giving no concrete emergency dose, over-promising on development, or failing to address the family's guilt about the genetic cause. [2] [3]