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A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devices.

Abstract：

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.

journal_name

Ann Intern Med

journal_title

Annals of internal medicine

authors

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

doi

10.7326/0003-4819-155-7-201110040-00004

subject

Has Abstract

pub_date

2011-10-04 00:00:00

pages

415-24

issue

eissn

0003-4819

issn

1539-3704

pii

155/7/415

journal_volume

155

pub_type

临床试验,杂志文章,多中心研究

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A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devices.