Cardiothoracic Surgery Department, University Hospital of Rio, University of Rio, Patras, Greece.
Ann Thorac Surg. 2011 Jun;91(6):2006-11. doi: 10.1016/j.athoracsur.2011.02.068. Epub 2011 Apr 30.
Magnetic resonance imaging (MRI) in patients with implanted cardiac prostheses and metallic cardiovascular electronic devices is sometimes a risky procedure. Thus MRI in these patients should be performed when it is the only examination able to help with the diagnosis. Moreover the diagnostic benefit must outweigh the risks. Coronary artery stents, prosthetic cardiac valves, metal sternal sutures, mediastinal vascular clips, and epicardial pacing wires are not contraindications for MRI, in contrast to pacemakers and implantable cardioverter-defibrillators. Appropriate patient selection and precautions ensure MRI safety. However it is commonly accepted that although hundreds of patients with pacemakers or implantable cardioverter-defibrillators have undergone safe MRI scanning, it is not a safe procedure. Currently, heating of the pacemaker lead is the major problem undermining MRI safety. According to the US Food and Drug Administration (FDA), there are currently neither "MRI-safe" nor "MRI-compatible" pacemakers and implantable cardioverter-defibrillators. In this article we review the international literature in regard to safety during MRI of patients with implanted cardiac prostheses and metallic cardiovascular electronic devices.
磁共振成像（MRI）在植入心脏假体和金属心血管电子设备的患者中有时是一项有风险的检查。因此，只有当 MRI 能够帮助诊断时，才应在这些患者中进行。此外，诊断获益必须超过风险。冠状动脉支架、人工心脏瓣膜、金属胸骨缝线、纵隔血管夹和心外膜起搏线不是 MRI 的禁忌症，与起搏器和植入式心脏复律除颤器相反。适当的患者选择和预防措施可确保 MRI 安全。然而，人们普遍认为，尽管数百名起搏器或植入式心脏复律除颤器患者已经进行了安全的 MRI 扫描，但这并不是一项安全的检查。目前，起搏器导线加热是破坏 MRI 安全性的主要问题。根据美国食品和药物管理局（FDA）的说法，目前既没有“MRI 安全”也没有“MRI 兼容”的起搏器和植入式心脏复律除颤器。本文回顾了有关植入心脏假体和金属心血管电子设备患者 MRI 安全性的国际文献。
