Unexpected pacing inhibition upon exposure to the 3T static magnetic field prior to imaging acquisition: What is the mechanism?
2011; Elsevier BV; Volume: 8; Issue: 6 Linguagem: Inglês
10.1016/j.hrthm.2010.12.048
ISSN1556-3871
Autores Tópico(s)Magnetic and Electromagnetic Effects
ResumoA 62-year-old man with an implantable cardioverter-defibrillator (ICD) and a history of lung cancer developed severe headaches. During performance of cranial 3T (Signa Excite-HD, General Electric, Waukesha, WI, USA) magnetic resonance imaging (MRI), the patient was monitored with both ECG and pulse oximetry. 1 Gimbel J.R. Magnetic resonance imaging of implantable cardiac rhythm devices at 3.0 tesla. Pacing Clin Electrophysiol. 2008; 31: 795-801 Crossref PubMed Scopus (79) Google Scholar The patient's hemodynamically stable underlying rhythm was sinus at 40 to 45 bpm with a narrow QRS and normal PR interval (Figure 1A). The pre-MRI programming strategy chosen for the patient's St. Jude Medical (Sylmar, CA, USA) Atlas II+ DR V-238 (A-lead: St. Jude Medical 1388TC-52 cm; V-lead: Medtronic [Mounds View, MN, USA] 6947-58 cm) was all tachycardia therapies "off", AAI pacing at 70 ppm, and nominal sensitivities. The patient's paced rhythm through the programmer just prior to the patient being placed on the table in the MRI suite is shown in Figure 1B.
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