Gold coating for CIED hypersensitivity: a proactive strategy: when and how to act

Ehrenhalt et al. demonstrate that a custom gold-coated ICD abolished recurrent pocket necrosis from metal hypersensitivity,1 but their patient endured six Life-Vest months while awaiting the device. Children and adults who depend on continuous pacing or defibrillation cannot safely wait for a custom device; a 9-year-old underwent four exteriorizations before an 18-carat gold-coated ICD was finally supplied.2 Maintaining an off-the-shelf inventory of gold-coated or nickel-free generators eliminate this hazardous gap. Polymer pouches remain a compromise. In vitro work shows that the resorbable TYRX Antibacterial Envelope reduces nickel ion release by about 30%,3 whereas comparable data for the non-resorbable GORE-TEX PRECLUDE are lacking. Clinical experience with these envelopes as the sole anti-allergic intervention is discouraging: Among five adults with early recurrent pocket dehiscence and negative cultures, three who received only TYRX still experienced further erosion and ultimately required generator exteriorization and upgrade to a titanium case3; in another report, one patient underwent two TYRX and one GORE-TEX PRECLUDE revision without metal exchange, yet developed a third dehiscence that only resolved after replacement with a gold-coated CRT-D.4 These observations support device replacement rather than re-wrapping once hypersensitivity is evident. We propose a pragmatic, risk-stratified protocol. Pre-implant questionnaire: population-based patch-test surveys indicate nickel sensitization rates of 8%–20% among adults, with higher prevalence in women.5 A brief screen asking about cutaneous reactions to costume jewellery, belt buckles or mobile phones can raise suspicion, but positive answers should be confirmed by patch testing before costly hardware changes are considered. Capsule biopsy at first dehiscence: small case series have described eosinophil-rich granulomatous inflammation in the fibrous capsule once infection is excluded.6 Although larger prospective studies are lacking, the presence of eosinophilia may support hypersensitivity, guiding the decision to upgrade to a hypo-allergenic generator. Direct upgrade: in patients with ≥2 early exteriorizations, negative cultures and granulomatous/eosinophilic histology, we favour immediate replacement with a gold-coated or proven nickel-free generator rather than repeated conservative revisions. This strategy converts a prolonged, resource-intensive salvage pathway into a single, definitive procedure; formal cost-effectiveness analyses are awaited. Regulators should incentivise manufacturers to streamline production and maintain stock, analogous to antibiotic-impregnated leads for high-infection-risk patients. The letter offers clinicians a practical framework and encourages prospective registries to quantify this under-recognized complication. This work was supported by the Shenzhen Guangming District Program for Introducing High-Level Medical Teams (Grant No. szgmtd2025004). Zhong-Qun Zhan (Conceptualization [lead], Writing—original draft [lead], Writing—review & editing [lead], Validation [lead]), and Yang Li (Writing—review & editing [supporting], Validation [supporting], Supervision). This work was supported by the Shenzhen Guangming District Program for Introducing High-Level Medical Teams (Grant No. szgmtd2025004). No new data were generated or analysed in support of this commentary.