Sleep disorders with neurological disease: SAQ

Question 1 (10 marks)

Outline your assessment and investigation of the boy with cerebral palsy, the likely diagnosis, and the principles of your management. (10 marks)

Model answer

Likely diagnosis (2 marks). This boy has sleep-disordered breathing, most probably obstructive sleep apnoea with nocturnal hypoventilation, driven by the hypotonic airway collapse of his cerebral palsy and compounded by his oromotor dysfunction, scoliosis, and gastrostomy dependence. His increasing seizure frequency, morning headache, and daytime irritability are the daytime consequences of fragmented and hypoxic sleep, and they illustrate the bidirectional link, because his worsening seizures are both a result of and a contributor to his broken sleep. ^[7]

Assessment (3 marks). I would take a structured sleep history asking specifically about snoring, witnessed pauses, restless and sweaty sleep, morning mood, and daytime sleepiness, and I would use a validated instrument such as the Sleep Disturbance Scale for Children and a two-week sleep diary. The examination would target the drivers, mapping his oromotor function and tone, his adenotonsillar size, his scoliosis, and his weight and growth, and I would review his medications because sedating antiseizure medicines and baclofen may depress respiratory drive overnight. I would ask the family to film any events. ^{[7] [9]}

Investigation (2 marks). The gold-standard test is polysomnography scored by the American Academy of Sleep Medicine rules, which distinguishes obstructive from central events, quantifies the apnoea-hypopnoea index, and assesses for nocturnal hypoventilation with rising carbon dioxide and intermittent desaturation. Overnight pulse oximetry with capnography is a practical screening tool in the community and is particularly useful for monitoring a technology-dependent child over time and after any intervention. ^{[11] [7]}

Management (3 marks). Management is stepped and treats the airway and the neurology together. I would optimise his epilepsy and his reflux and constipation in parallel, because uncontrolled nocturnal seizures and reflux will defeat any sleep plan. Definitive treatment may include adenotonsillectomy in a carefully selected child, weighing the postoperative airway risk of a hypotonic child, and continuous positive airway pressure or bilevel non-invasive ventilation for the obstructive and hypoventilating child. He needs lifelong respiratory and sleep monitoring as he grows and after any surgery, and shared care between primary paediatrics, neurodisability, and the sleep service. ^[7]