2Fit for Surgery: The Medical and Anaesthetic Work-up

CThe fitness-for-anaesthesia baseline

Guidelines require every candidate to undergo complete medical evaluation by the surgical team and to have documented health status sufficient to tolerate elective surgery under general anaesthesia; the work-up exists to identify conditions needing specialised management or amounting to a contraindication. The FDA-recommended pre-operative protocol bundles medical examination and imaging with audiological, speech-recognition, communication and psychological assessment, so anaesthetic clearance is one component of a broader interdisciplinary readiness check rather than a standalone gate. Active upper-respiratory infection, fever or intercurrent childhood illness at the scheduled date makes anaesthesia inadvisable and is grounds to postpone; a medically stable patient is a prerequisite for safe implantation. Cochlear implantation is elective, so the threshold for delaying to optimise a comorbidity is low and there is rarely a reason to operate on a patient who is not at their medical baseline.[2006][2006][2019]

CComorbidities that change the plan: cardiac, airway, bleeding, diabetes

Jervell and Lange-Nielsen syndrome, a congenital sensorineural deafness from a potassium-channel defect, causes a prolonged QT interval and exertional Torsade de Pointes; every paediatric candidate needs a 12-lead ECG to screen for it, and once identified beta-blockade is mandatory to prevent intra-operative arrhythmia. A wide vestibular aqueduct on imaging may signal Pendred syndrome and should prompt paediatric or endocrine referral before theatre, illustrating how a radiological finding can flag a systemic comorbidity relevant to anaesthesia. Diabetes, anticoagulation and a difficult airway are the routine comorbidities to optimise in advance: glycaemic control and an agreed perioperative anticoagulation plan reduce bleeding and infection risk, while difficult-airway anatomy is identified pre-operatively rather than discovered on induction. Careful haemostasis over the dura during bed preparation is needed to prevent post-operative extradural haematoma, linking the bleeding-tendency history directly to a CI-specific surgical risk.[2006][2006][2009]

CThe infant and paediatric anaesthetic

Cochlear implant surgery in children, particularly very young infants, mandates an experienced paediatric anaesthetist and proper paediatric nursing facilities; this is not a procedure to undertake without dedicated paediatric anaesthetic cover. A child with poor lung function or oxygen dependence from prematurity or congenital cardiopulmonary disease requires specialised anaesthetic assessment and management before implantation can be safely scheduled. The thin infant skull may require exposing the dura while preparing the implant bed; the young dura is more robust than the elderly patient and gentle manual retraction is usually safe, but damage is possible and meticulous haemostasis is essential. An X-linked or incomplete-partition malformation raises the risk of an intra-operative perilymph-CSF gusher, so anatomy must be anticipated pre-operatively and the anaesthetic and surgical team prepared for continuous clear-fluid release at cochleostomy.[2006][2025][2006]

TThe CI-specific pre-anaesthetic check and meningitis prophylaxis

Pneumococcal vaccination (PCV plus PPSV23) is recommended for all candidates and should be given at least 2 weeks before surgery; the CDC found implant recipients had a 138.2-fold higher incidence of pneumococcal meningitis, more than 30 times the rate in same-age peers. Vaccination status is a hard pre-operative checklist item: confirming completion before theatre is the single most effective infection-safety step, and structured programmes have lifted paediatric uptake from 67% to 98%. Hib vaccination is recommended only for children under 5 years, also at least 2 weeks pre-op, as data do not show elevated Hib meningitis risk in older children or adults, in contrast to the universally elevated pneumococcal risk. Inner-ear malformation plus an intra-operative CSF leak is a high-risk combination: in a review of 1,300 malformed ears, 6 of 10 post-operative meningitis cases occurred with intra-operative CSF leak, so anticipated gusher anatomy should be on the pre-anaesthetic flag list.[2003][2003][2018][2023]