Erlebacher J A, Cahill P T, Pannizzo F, Knowles R J
Am J Cardiol. 1986 Feb 15;57(6):437-40. doi: 10.1016/0002-9149(86)90768-x.
A previous study suggested the safety of exposing patients with certain pacemakers models to magnetic resonance imaging (MRI). However, the function of a variety of more advanced DDD pacemakers and the effect of higher magnetic and radio-frequency (rf) field strengths has not been reported. In the present study 4 different DDD pacemakers (Cordis 233F, Intermedic 283-01, Medtronic 7000A, and Pacesetter 283) were tested in a saline phantom under several conditions and with various imaging sequences. Pacemaker output was monitored using electrocardiographic telemetry. All units paced normally in the static magnetic field. However, during imaging, all units malfunctioned, with total inhibition of atrial and ventricular output in 3 of the pacemakers. In the fourth pacemaker, ventricular backup pacing was activated at high rf pulse repetition rates. However, the MRI scanner could trigger atrial output in this pacemaker at rates of up to 800/minute. All malfunctions were a result of rf interference, whereas gradient and static magnetic fields had no effect. Thus, despite magnetic fields had no effect. Thus, despite magnetic field strengths adequate to close pacemaker reed switches, rf interference during MRI may cause total inhibition of atrial and ventricular output in DDD pacemakers, and can also cause dangerous atrial pacing at high rates. MRI should be avoided in patients with these DDD pacemakers.
先前的一项研究表明，让某些型号的起搏器患者接受磁共振成像（MRI）检查是安全的。然而，各种更先进的双腔（DDD）起搏器的功能以及更高磁场和射频（rf）场强的影响尚未见报道。在本研究中，对4种不同的DDD起搏器（科迪斯233F、英特美迪克283 - 01、美敦力7000A和百盛283）在几种条件下并使用各种成像序列在盐水模型中进行了测试。使用心电图遥测监测起搏器输出。所有装置在静磁场中均能正常起搏。然而，在成像过程中，所有装置均出现故障，其中3种起搏器的心房和心室输出完全受到抑制。在第四种起搏器中，在高射频脉冲重复率下激活了心室备用起搏。然而，MRI扫描仪可使该起搏器的心房输出以高达800次/分钟的速率触发。所有故障均是射频干扰所致，而梯度磁场和静磁场则无影响。因此，尽管磁场强度足以闭合起搏器簧片开关，但MRI期间的射频干扰可能导致DDD起搏器的心房和心室输出完全抑制，还可导致高频率的危险心房起搏。患有这些DDD起搏器的患者应避免进行MRI检查。
