A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devices.
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 nonr...
| Publicado en: | Annals of Internal Medicine Vol. 155; no. 7; pp. 415 - 425 |
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| Autores principales: | , , , , , , , , , , , , , , , , , , , |
| Formato: | clinical trial research Journal Article |
| Publicado: |
American College of Physicians
10/4/2011
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104586199&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104586199 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00034819 AIM jtl: Annals of Internal Medicine issn: 00034819 maglogo: N pubinfo: dt: 10/4/2011 vid: 155 iid: 7 pid: 1652 pub: American College of Physicians place: Philadelphia, Pennsylvania artinfo: ui: 104586199 NLM21969340 2011310069 10.7326/0003-4819-155-7-201110040-00004 NLM21969340 PMC4337840 104586199 ppf: 415 ppct: 10 formats: tig: atl: A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devices. aug: au: Nazarian S Hansford R Roguin A Goldsher D Zviman MM Lardo AC Caffo BS Frick KD Kraut MA Kamel IR Calkins H Berger RD Bluemke DA Halperin HR Nazarian, Saman Hansford, Rozann Roguin, Ariel Goldsher, Dorith Zviman, Menekhem M Lardo, Albert C affil: Johns Hopkins University, Baltimore, Maryland 21287, USA sug: subj: Defibrillators, Implantable Magnetic Resonance Imaging Contraindications Magnetic Resonance Imaging Methods Pacemaker, Artificial Aged Clinical Trials Electrophysiology Equipment Design Equipment Failure Female Human Magnetic Resonance Imaging Adverse Effects Male Middle Age Monitoring, Physiologic Prospective Studies Protocols Software Aged: 65+ years Middle Aged: 45-64 years Female Male ab: 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. pubtype: Academic Journal doctype: clinical trial research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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