| Clinically significant magnetic interference of implanted cardiac devices by portable headphones. | |
MedLine Citation:
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PMID: 19968922 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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BACKGROUND: Little is known about the magnetic field strength of portable headphones and their potential to cause magnetic interference with implanted pacemakers (PMs) and implantable cardioverter-defibrillators (ICDs). OBJECTIVE: The purpose of this study was to evaluate the magnetic field strength of portable headphones and to determine if they can cause clinically relevant magnetic interference. METHODS: PM or ICD function was assessed in 100 patients during exposure to eight different models of portable headphones to determine the incidence of clinically relevant magnetic interference. The magnetic field strength of the headphones also was measured in vitro. RESULTS: Clinically relevant magnetic interference from portable headphones occurred in 30 (30%) of 100 patients and more commonly affected ICD than PM patients (21/55 [38.2%] vs 9/45 [20.0%]; P = .048). All patients affected by magnetic interference experienced a magnet response, characterized by asynchronous pacing in PM patients and by inhibition of tachyarrhythmia detection in ICD patients. In all but one of the 30 cases of magnetic interference, removal of the headphones from the patient's chest immediately restored normal device function. Headphones with a measured magnetic field strength > or =10 gauss at 2 cm were much more likely to cause magnetic interference than were those with lower magnetic field strength (30/100 [30%] patients vs 0/100 [0%] patients; P <.0001). Magnetic interference was not observed when headphones were placed > or =3 cm from the skin surface. CONCLUSION: Clinically significant magnetic interference can occur when portable headphones are placed in close proximity to implanted PMs and ICDs. Patients with such a device should be advised to keep portable headphones at least 3 cm from their device. |
Authors:
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Sinjin Lee; Kevin Fu; Tadayoshi Kohno; Benjamin Ransford; William H Maisel |
Publication Detail:
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Type: Journal Article Date: 2009-07-08 |
Journal Detail:
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Title: Heart rhythm : the official journal of the Heart Rhythm Society Volume: 6 ISSN: 1556-3871 ISO Abbreviation: Heart Rhythm Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2009-12-08 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101200317 Medline TA: Heart Rhythm Country: United States |
Other Details:
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Languages: eng Pagination: 1432-6 Citation Subset: IM |
Affiliation:
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Cardiovascular Institute, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. |
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Descriptor/Qualifier:
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Comment In:
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Heart Rhythm. 2009 Oct;6(10):1437-8
[PMID:
19716347]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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