Magnetic field–induced interactions between phones containing magnets and cardiovascular implantable electronic devices: Flip it to be safe?,Heart Rhythm

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Magnetic field–induced interactions between phones containing magnets and cardiovascular implantable electronic devices: Flip it to be safe?
Heart Rhythm ( IF 5.6 ) Pub Date : 2021-11-10 , DOI: 10.1016/j.hrthm.2021.11.010
Philipp Lacour ₁ , Phi Long Dang ₂ , Frank R Heinzel ₁ , Abdul Shokor Parwani ₁ , Felix Bähr ₁ , Andreas Kucher ₃ , Felix Hohendanner ₁ , Thoralf Niendorf ₄ , Faezeh Rahimi ₄ , Nandita Saha ₄ , Haopeng Han ₄ , Kerstin Rubarth ₅ , Mohammad Sherif ₁ , Leif-Hendrik Boldt ₁ , Burkert Pieske ₆ , Florian Blaschke ₁

Affiliation

Background

Recent case reports and small studies have reported activation of the magnet-sensitive switches in cardiovascular implantable electronic devices (CIEDs) by the new iPhone 12 series, initiating asynchronous pacing in pacemakers and suspension of antitachycardia therapies in implantable cardioverter-defibrillators (ICDs).

Objective

The purpose of this prospective single-center observational study was to quantify the risk of magnetic field interactions of the iPhone 12 with CIEDs.

Methods

A representative model of each CIED series from all manufacturers was tested ex vivo. Incidence and minimum distance necessary for magnet mode triggering were analyzed in 164 CIED patients with either the front or the back of the phone facing the device. The magnetic field of the iPhone 12 was analyzed using a 3-axis Hall probe.

Results

Ex vivo, magnetic interference occurred in 84.6% with the back compared to 46.2% with the front of the iPhone 12 facing the CIED. In vivo, activation of the magnet-sensitive switch occurred in 30 CIED patients (18.3%; 21 pacemaker, 9 ICD) when the iPhone 12 was placed in close proximity over the CIED pocket and the back of the phone was facing the skin. Multiple binary logistic regression analysis identified implantation depth (95% confidence interval 0.02–0.24) as an independent predictor of magnet-sensitive switch activation.

Conclusion

Magnetic field interactions occur only in close proximity and with precise alignment of the iPhone 12 and CIEDs. It is important to advise CIED patients to not put the iPhone 12 directly on the skin above the CIED. Further recommendations are not necessary.

中文翻译：

含有磁铁的手机与心血管植入式电子设备之间的磁场感应相互作用：翻转它是否安全？

背景

最近的病例报告和小型研究报告称，新款 iPhone 12 系列激活了心血管植入式电子设备 (CIED) 中的磁敏开关，启动了起搏器中的异步起搏，并暂停了植入式心脏复律除颤器 (ICD) 中的抗心动过速治疗。

客观的

这项前瞻性单中心观察性研究的目的是量化 iPhone 12 与 CIED 的磁场相互作用的风险。

方法

来自所有制造商的每个 CIED 系列的代表性模型进行了离体测试。在 164 名 CIED 患者中分析了磁铁模式触发所需的发生率和最小距离，手机正面或背面均面向设备。使用 3 轴霍尔探头分析 iPhone 12 的磁场。

结果

在体外，84.6% 的背面发生磁干扰，而 iPhone 12 正面朝向 CIED 的发生率为 46.2%。在体内，当 iPhone 12 靠近 CIED 口袋并且手机背面朝向皮肤时，30 名 CIED 患者（18.3%；21 名起搏器，9 名 ICD）发生了磁敏开关的激活。多元二元逻辑回归分析确定植入深度（95% 置信区间 0.02-0.24）是磁敏开关激活的独立预测因子。