What are the cardiac implantable electronic device (CIED) pacing modes?

Updated: Oct 29, 2018
  • Author: Albert H Tsai, MD; Chief Editor: Sheela Pai Cole, MD  more...
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CIED pacing modes are labeled according to a five-letter coding system. [1] For the purposes of this article, however, only the letters in the first four positions of the code are relevant, as follows:

  • Position I - Chamber(s) paced (O=none, A=atrium, V=ventricle, D=dual [A+V])
  • Position II - Chamber(s) sensed (O=none, A=atrium, V=ventricle, D=dual [A+V])
  • Position III - Response to sensing (O=none, T=triggered, I=inhibited, D=dual [T+I])
  • Position IV - Rate modulation (O=none, R=rate modulation)

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