Magnet

Reviewed and revised 7 May 2014

OVERVIEW

  • a magnet is a device that creates its own magnetic field

USES

  • assessment of pacemakers and implantable cardioverter-defibrillators

METHOD OF USE

  • place magnet near device

Pacemaker

  • will default to asynchronous mode or a fixed rate (turns off sensing)
  • Rate depends on battery life (usually 70-90/min)
  • can be used to identify oversensing
  • help identify battery failure as a cause of failure to capture

ICD

  • will turn off the antiarrhythmic programme (potentially dangerous!) -> need to have a defibrillator nearby
  • no effect on backup pacemaker
  • inactivate during CPR (compressionist may feel the 40J shocks from the ICD -> transient discomfort, minimal risk of harm)
  • inactivate after death in non-coroner’s cases
  • inactivate during transcutaneous pacing
  • inactivate when inappropriate shocks occurring

COMPLICATIONS

  • may prevent ICD from cardioverting a dangerous dysrhythmia

References and Links

Journal articles

  • Jacob S, Panaich SS, Maheshwari R, Haddad JW, Padanilam BJ, John SK. Clinical applications of magnets on cardiac rhythm management devices. Europace. 2011 Sep;13(9):1222-30. doi: 10.1093/europace/eur137. Epub 2011 May 26. PMID: 21616944.
  • Rodriguez-Blanco YF, Souki F, Tamayo E, Candiotti K. Magnets and implantable cardioverter defibrillators: what’s the problem? Ann Card Anaesth. 2013 Jan-Mar;16(1):54-7. PMID: 23287088.

CCC 700 6

Critical Care

Compendium

Chris is an Intensivist and ECMO specialist at the Alfred ICU in Melbourne. He is also the Innovation Lead for the Australian Centre for Health Innovation at Alfred Health and Clinical Adjunct Associate Professor at Monash University. He is a co-founder of the Australia and New Zealand Clinician Educator Network (ANZCEN) and is the Lead for the ANZCEN Clinician Educator Incubator programme. He is on the Board of Directors for the Intensive Care Foundation and is a First Part Examiner for the College of Intensive Care Medicine. He is an internationally recognised Clinician Educator with a passion for helping clinicians learn and for improving the clinical performance of individuals and collectives.

After finishing his medical degree at the University of Auckland, he continued post-graduate training in New Zealand as well as Australia’s Northern Territory, Perth and Melbourne. He has completed fellowship training in both intensive care medicine and emergency medicine, as well as post-graduate training in biochemistry, clinical toxicology, clinical epidemiology, and health professional education.

He is actively involved in in using translational simulation to improve patient care and the design of processes and systems at Alfred Health. He coordinates the Alfred ICU’s education and simulation programmes and runs the unit’s education website, INTENSIVE.  He created the ‘Critically Ill Airway’ course and teaches on numerous courses around the world. He is one of the founders of the FOAM movement (Free Open-Access Medical education) and is co-creator of litfl.com, the RAGE podcast, the Resuscitology course, and the SMACC conference.

His one great achievement is being the father of two amazing children.

On Twitter, he is @precordialthump.

| INTENSIVE | RAGE | Resuscitology | SMACC

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.