| A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devices. | |
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MedLine Citation:
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PMID: 21969340 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Background: Magnetic resonance imaging (MRI) is avoided in most patients with implanted cardiac devices because of safety concerns. Objective: To define the safety of a protocol for MRI at the commonly used magnetic strength of 1.5 T in patients with implanted cardiac devices. Design: Prospective nonrandomized trial. (ClinicalTrials.gov registration number: NCT01130896) Setting: One center in the United States (94% of examinations) and one in Israel. Patients: 438 patients with devices (54% with pacemakers and 46% with defibrillators) who underwent 555 MRI studies. Intervention: Pacing mode was changed to asynchronous for pacemaker-dependent patients and to demand for others. Tachyarrhythmia functions were disabled. Blood pressure, electrocardiography, oximetry, and symptoms were monitored by a nurse with experience in cardiac life support and device programming who had immediate backup from an electrophysiologist. Measurements: Activation or inhibition of pacing, symptoms, and device variables. Results: In 3 patients (0.7% [95% CI, 0% to 1.5%]), the device reverted to a transient back-up programming mode without long-term effects. Right ventricular (RV) sensing (median change, 0 mV [interquartile range {IQR}, -0.7 to 0 V]) and atrial and right and left ventricular lead impedances (median change, -2 Ω [IQR, -13 to 0 Ω], -4 Ω [IQR, -16 to 0 Ω], and -11 Ω [IQR, -40 to 0 Ω], respectively) were reduced immediately after MRI. At long-term follow-up (61% of patients), decreased RV sensing (median, 0 mV, [IQR, -1.1 to 0.3 mV]), decreased RV lead impedance (median, -3 Ω, [IQR, -29 to 15 Ω]), increased RV capture threshold (median, 0 V, IQR, [0 to 0.2 Ω]), and decreased battery voltage (median, -0.01 V, IQR, -0.04 to 0 V) were noted. The observed changes did not require device revision or reprogramming. Limitations: Not all available cardiac devices have been tested. Long-term in-person or telephone follow-up was unavailable in 43 patients (10%), and some data were missing. Those with missing long-term capture threshold data had higher baseline right atrial and right ventricular capture thresholds and were more likely to have undergone thoracic imaging. Defibrillation threshold testing and random assignment to a control group were not performed. Conclusion: With appropriate precautions, MRI can be done safely in patients with selected cardiac devices. Because changes in device variables and programming may occur, electrophysiologic monitoring during MRI is essential. Primary Funding Source: National Institutes of Health. |
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Authors:
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Saman Nazarian; Rozann Hansford; Ariel Roguin; Dorith Goldsher; Menekhem M Zviman; Albert C Lardo; Brian S Caffo; Kevin D Frick; Michael A Kraut; Ihab R Kamel; Hugh Calkins; Ronald D Berger; David A Bluemke; Henry R Halperin |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Annals of internal medicine Volume: 155 ISSN: 1539-3704 ISO Abbreviation: Ann. Intern. Med. Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372351 Medline TA: Ann Intern Med Country: United States |
Other Details:
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Languages: eng Pagination: 415-24 Citation Subset: AIM; IM |
Affiliation:
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Johns Hopkins University, Baltimore, Maryland; Rambam Medical Center, Technion Institute of Technology, Haifa, Israel; and Radiology and Imaging Sciences, National Institutes of Biomedical Imaging and Bioengineering, Bethesda, Maryland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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