Morbidly Obese Patient for Prone Spinal Surgery

A 58-year-old man presents to the preadmission clinic prior to thoracic decompression and sural nerve biopsy to be done in the prone position. His history includes progressive lower limb and truncal weakness. Progression has occurred over the last four months and he is now wheelchair-bound. Weight 152kg, body mass index 48 kg/m2 His past medical history includes: - obstructive sleep apnoea - on continuous positive airway pressure (CPAP) therapy - hypertension Current medications: - candesartan 8mg daily - enoxaparin 40mg subcutaneous injection daily - pregabalin 150mg bd