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Journal of Speech, Language, and Hearing Research Vol.52 1082-1087 August 2009. doi:10.1044/1092-4388(2009/08-0028)
© American Speech-Language-Hearing Association
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Research Note

Safety of Electromagnetic Articulography in Patients With Pacemakers and Implantable Cardioverter-Defibrillators

Jose A. Joglar
Carol Nguyen
The University of Texas Southwestern Medical Center, Dallas, TX

Diane M. Garst
Dallas Veterans Administration Research Corporation, Dallas, TX

William F. Katz
The University of Texas at Dallas

Contact author: William F. Katz, The University of Texas at Dallas, Callier Center for Communication Disorders, 1966 Inwood Road., Dallas, TX 75235-7298. E-mail: wkatz{at}utdallas.edu.

Purpose: Electromagnetic articulography (EMA) uses a helmet to create alternating magnetic fields for tracking speech articulator movement. An important safety consideration is whether EMA magnetic fields interfere with the operation of speakers' pacemakers or implantable cardioverter-defibrillators (ICDs). In this investigation, individuals with pacemaker/ICD devices were exposed to EMA fields under controlled conditions while potential interference was examined.

Method: Twelve adults with pacemaker/ICD devices from 3 major manufacturers were assessed for device function before, during, and after exposure to magnetic fields from a Carstens AG100 EMA system. Potential interference was probed, with EMA transmitters positioned at varying distances from the implantable devices and with the EMA system set at different operating strengths.

Results: No adverse affects in device operation were observed under any conditions. The only potential complication was temporary telemetry-link interference during device testing in some cases.

Conclusion: The results suggest that EMA technology may be safely used with patients who have pacemakers and ICDs. However, the present findings do not rule out potential interference with other pacemaker/ICD manufacturers or with different articulography systems. Precautions are suggested for testing individuals with pacemaker/ICDs under EMA conditions.

KEY WORDS: electromagnetic articulography, pacemaker, defibrillator, electromagnetic interference, EMA safety


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