Defining the Optimal Timing for Cochlear Implant Activation: A Review of the Literature and Current Practice Variability

Abstract

Background: Hearing loss is among the top three non-fatal disabling conditions in low- and middle-income countries (LMICs), where cochlear implantation (CI), the gold standard for severe-to-profound sensorineural hearing loss, remains underused. Conventionally, device activation occurs 2-4 weeks postoperatively however, early activation (EA) within days of surgery has shown promising benefits.

Objective & Methods: Literature reveals inconsistencies in defining EA and late activation (LA). Some studies report device activation as early as 1 to 7 days postoperatively, while others classify activation within 8 to 14 days as either EA or LA. Traditionally, activation has been reported between 9 and 46 days postoperatively. This lack of consensus complicates the development of standardized postoperative activation timelines and impedes evidence-based clinical guidelines. This narrative review aims to compare the outcomes, feasibility, and safety of EA versus traditional activation in CI patients while highlighting the variability in definitions and activation timelines across studies. A thorough literature search was conducted using PubMed, Scopus, Google Scholar, and Google.

Results: Seventeen studies were included, comprising 3 systematic reviews, 2 literature reviews, and 12 primary studies. Most studies reported EA on the first postoperative day, demonstrating benefits such as faster auditory rehabilitation, improved speech recognition, reduced anxiety, and higher patient satisfaction. EA was not associated with increased complications and was cost-effective, particularly for patients from remote areas. However, long-term impedance outcomes were similar between EA and LA.

Conclusion: First-day EA appears feasible, safe, and beneficial. Still, large-scale prospective studies are needed to establish optimal activation timing and support standardized CI care protocols.