How does a pacemaker interact with an MRI machine?

Numbers match the citations in the article. A working link isn't proof that a page supports a claim; check the quoted passage and date.

1. 1

   Magnetic resonance imaging (Wikipedia)

   WikipediaPublished Oct 15, 2026Checked Oct 17, 2026

   “Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to generate pictures of the anatomy and the physiological processes inside the body. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to form images of the organs in the body. MRI does not involve X-rays or the use of ionizing radiation, which distinguishes it from computed tomography (CT) and positron emission tomography (PET) scans. MRI is a medical application of nuclear magnetic resonance (NMR), which can also be used for imaging in other NMR applications, such as NMR spectroscopy. MRI is widely used in hospitals and clinics for medical diagnosis, staging and follow-up of disease. In the early 1970s, it was demonstrated by R. Damadian, C.F. Hazlewood and D.C. Chang that measurement of NMR relaxation times can be used to detect cancer. Soon after that, P.C. Lauterbur proposed to use a magnetic field gradient to generate the NMR image in a 2-D plane. Compared to CT, MRI provides better contrast in images of soft tissues, e.g. in the brain or abdomen.”

2. 2

   Applicability of Stress Cardiac Magnetic Resonance Imaging in Patients With Cardiac Implantable Devices: A Systematic Review.

   Cardiology research and practice (Zakavi et al.)Published Jun 28, 2026Checked Oct 17, 2026

   “PurposeThe utilization of stress perfusion cardiac magnetic resonance (CMR) in patients with cardiac implantable electronic devices (CIEDs) is still limited.MethodsThe study was registered in the Prospective Register of Systematic Reviews (PROSPERO) with ID CRD42023457308. PubMed, Scopus, Embase, Web of Science, ProQuest, and CINAHL databases were searched using the Mesh and related terms of CMR imaging, stress, and CIEDs.ResultsOut of the 1695 papers we found, eight met our inclusion criteria. We reviewed the included studies and provided a concluding remark concerning (a) image quality; (b) CMR compatibility, scanner, and safety; (c) device protocols and exclusion criteria; (d) vasodilator choices, effects, and safety; and (e) clinical outcomes.ConclusionThis study has demonstrated a positive trend in the utilization of stress CMR in MR-conditional devices. However, the review has identified multiple research gaps that warrant further investigation.”

3. 3

   An Interchangeability Test Method for Developing IPG Impedance Equivalency Evidence for Cardiac Implantable Electronic Device Under MRI.

   Magnetic resonance in medicine (Jeong et al.)Published Apr 26, 2026Checked Oct 17, 2026

   “This study aimed to develop a least-burdensome RF safety evaluation method for MR Conditional labeling of CIEDs. Critical parameters were characterized and demonstrated as an IPG equivalency test method that supports leveraging existing single-manufacturer MR-Conditional labeling for mixed-manufacturer systems.MethodsThe transfer function model of the pacing lead was measured using the original system (LeadA + IPGA) or a third-party IPGs (LeadA + IPGB or IPGC). Deposited power near the lead tip was compared for 50 Ω and open-end conditions, and lead or IPG impedances were measured at 64 and 128 MHz.ResultsLead tip heating was not significantly different between original and third-party IPGs configurations (p 80.2 Ω) may not significantly alter RF-induced heating, remaining within measurement uncertainties.ConclusionA simplified IPG impedance equivalency test has been developed to facilitate MRI access for patients with CIEDs that undergo IPG interchange. This test aids assessment of whether replacing an original IPG model with a different model may significantly increase RF-induced heating compared to the original system.”

4. 4

   Preferences of Patients and Cardiologists Regarding Pacemaker Characteristics in Spain: A Discrete Choice Experiment.

   Patient preference and adherence (García et al.)Published Feb 20, 2026Checked Oct 17, 2026

   “For both patients (P) and cardiologists (C), the most important characteristics of pacemakers (higher relative importance, RI) are MRI compatibility (P: 28.1%; C: 25.1%) and battery longevity (P: 22.6%; C: 23.8%). The type of follow-up is more highly valued by cardiologists than by patients (P: 10.2%; C: 21.1%), whereas pacemaker size is prioritized by patients (P: 19.1%; C: 7.7%). From the cardiologists' perspective, safety (12-month post-implantation infection rate: 19.39%) and technical aspects such as conduction system pacing (CSP) (15.14%), algorithms for minimizing unnecessary right ventricular stimulation (9.43%), and programming modes (9.11%) are also important decision drivers.ConclusionMRI compatibility and battery longevity are key factors for both patients and cardiologists in decision-making. Patients also prioritize generator size and replacement processes, while cardiologists additionally focus on safety (infection rates) and technical aspects (CSP and algorithms to reduce unnecessary right ventricular stimulation).”

5. 5

   Perioperative management of cardiac implantable electronic devices: a state of the art narrative review.

   Journal of thoracic disease (Fernando et al.)Published May 27, 2026Checked Oct 17, 2026

   “Only papers in the English language were considered.Key content and findingsFive guidance documents were retrieved based on the search. Some had endorsement from numerous groups, but notable organizations included: (I) the American Society of Anesthesiologists (ASA); (II) European Heart Rhythm Association (EHRA)/Heart Rhythm Society; (III) British Heart Rhythm Society; (IV) American Heart Association (AHA)/American College of Cardiology (ACC); and (V) AHA.ConclusionsFamiliarity with these devices and how to manage them perioperatively is necessary to safely care for these patients in the perioperative period. Although there are similarities between perioperative management strategies, differences exist between recommendations from various societies. Furthermore, the scope of each of these documents differs, with some being more detailed and others lacking details. In the absence of a universal protocol, clinicians could benefit from being familiar with guidance from each of these organizations, taking into consideration the strengths and limitations of the documents, and applying the recommendation that is most relevant and specific to their patient.”

6. 6

   Temporary transvenous external pacing for cardiac MRI in a pediatric patient.

   Pediatric radiology (Rokni et al.)Published Jul 31, 2025Checked Oct 17, 2026

   “This report discusses the use of temporary transvenous external cardiac pacing during cardiac magnetic resonance imaging (MRI). Despite its feasibility having been explored in adults, its application in pediatric patients is not well established. We present a case of a 6-year-old female with a high-degree atrioventricular (AV) block managed with an externalized temporary pacing system for MRI. This system enabled cardiac MRI for further treatment planning, eliminating the immediate need for permanent pacemaker implantation. This case underscores the feasibility of conducting cardiac MRI in pediatric patients requiring temporary pacing, contingent upon the utilization of appropriate equipment and protocols.”

7. 7

   Preferences of Patients and Cardiologists Regarding Pacemaker Characteristics in Spain: A Discrete Choice Experiment.

   Patient preference and adherence (García et al.)Published Feb 20, 2026Checked Oct 17, 2026

   “For both patients (P) and cardiologists (C), the most important characteristics of pacemakers (higher relative importance, RI) are MRI compatibility (P: 28.1%; C: 25.1%) and battery longevity (P: 22.6%; C: 23.8%). The type of follow-up is more highly valued by cardiologists than by patients (P: 10.2%; C: 21.1%), whereas pacemaker size is prioritized by patients (P: 19.1%; C: 7.7%). From the cardiologists' perspective, safety (12-month post-implantation infection rate: 19.39%) and technical aspects such as conduction system pacing (CSP) (15.14%), algorithms for minimizing unnecessary right ventricular stimulation (9.43%), and programming modes (9.11%) are also important decision drivers.ConclusionMRI compatibility and battery longevity are key factors for both patients and cardiologists in decision-making. Patients also prioritize generator size and replacement processes, while cardiologists additionally focus on safety (infection rates) and technical aspects (CSP and algorithms to reduce unnecessary right ventricular stimulation).”