16Postoperative Care and the Road to Switch-On
The implant is in, the wound is closed, and the most important part of the journey to hearing has barely begun. The weeks between surgery and switch-on are not idle waiting; they are a deliberate pause to let the flap heal and swelling settle so the device sits well against a stable scalp. This module follows the recipient from the layered closure and head bandage, through the complications a team watches for, to the handover that turns a surgical patient into a programming patient.
TClosing up: layered repair, fixation and the head bandage
After meticulous irrigation, often with antibiotic-containing saline, the wound is closed in anatomical layers (periosteum/pericranium and then skin) without tension, because tension and poor flap blood supply are the recognised antecedents of breakdown. The receiver-stimulator is secured by a non-absorbable suture through drilled bone holes, by titanium screws, or increasingly by a tight subperiosteal pocket that avoids drilling onto dura and the CSF-leak and haematoma risks that carries. The cochleostomy or round window is sealed with pericranium, fascia, or muscle; an inadequate seal is theoretically a route for meningitis, so closure of the cochlear entry is treated as a deliberate step. A light mastoid dressing or head bandage is applied; in many units it stays on overnight and is removed the morning after surgery, providing gentle pressure to discourage haematoma and seroma under the flap. The whole primary operation typically takes 1.5 to 3 hours, after which the dressing and a clear flap form the foundation for everything that follows.[2012][2009][2005]
TDay case or overnight: discharge and the early watch-list
Adults are commonly discharged the same day, and patients are typically discharged the same or the following day, with the trend toward day-case surgery enabled by smaller 3-4 cm incisions that need little or no hair removal. Early complications to watch are haematoma or seroma under the flap, flap problems (dehiscence, infection, necrosis), transient vertigo or imbalance, facial-nerve weakness, and wound infection. Flap-related complications (dehiscence, infection and necrosis) are historically the most commonly reported surgical complications of implantation, and one author reported over 100 consecutive small-incision cases with no dehiscence or flap necrosis. Facial weakness is rare but must be assessed and documented before discharge, since the nerve is at risk during the facial-recess approach and any new palsy needs urgent review. Vertigo is usually transient and settles with reassurance and short-term symptomatic treatment, but persistent or severe imbalance warrants examination to exclude a labyrinthine complication.[2012][2009][1997]
TMedicines, wound review and what families are told
Perioperative antibiotics are standard, but there is no consensus on continuing them postoperatively, so practice varies between a single perioperative dose and a short oral course. Analgesia is usually simple (paracetamol with a short course of a stronger agent for the first days), as a clean implant wound is moderately rather than severely painful. A monopolar cautery warning is permanent: once an implant is in place, monopolar diathermy must never be used in the head and neck for any future surgery, and families and other clinicians are told this explicitly; bipolar is safe. Wound review is scheduled at roughly 7 to 14 days to check healing, remove sutures if non-absorbable, and confirm the flap is settling before the external processor will sit against it. Family instructions cover keeping the wound dry, recognising red-flag signs (spreading redness, swelling, discharge, fever, new facial weakness, worsening dizziness), and the practical point that the device is not yet switched on.[2009][2012][2007]
FWhy wait two to four weeks, and the handover to programming
Activation typically takes place 3 to 4 weeks after surgery, with smaller-incision techniques sometimes allowing initial activation at about 2 weeks once the flap is sound. The wait is deliberate: it allows the flap to heal and postoperative oedema to subside so the external coil couples reliably and the swelling does not distort the magnet-to-receiver distance. A postoperative radiograph is generally obtained to confirm the array is intracochlear and to serve as a baseline for any future comparison, completing the surgical record before programming begins. At switch-on the recipient passes from the surgical team to the audiology/programming team, who set threshold and comfort levels and begin the mapping covered in Chapter 17. Intraoperative measures recorded at surgery, such as ECAP/NRT thresholds and impedances, are handed over as a starting point for the first map, especially useful in young children where behavioural responses are limited.[2009][2012][2014]
What is the most likely problem and the appropriate first response?
Why is cochlear implant activation typically delayed to about 3 to 4 weeks after surgery?
Which precaution is permanent for every cochlear implant recipient undergoing any future head and neck surgery?