How is cardiac implantable electronic device (CIED) pacing categorized?

Updated: Oct 29, 2018
  • Author: Albert H Tsai, MD; Chief Editor: Sheela Pai Cole, MD  more...
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Finally, pacing can be categorized as synchronous or asynchromous, as follows:

  • Synchronous (demand) pacing refers to any pacing mode with a value of A, V, or D in position II (sensing chamber), which represents device pacing that is contingent on the native cardiac rhythm
  • Asynchronous pacing refers to a pacing mode with O in position II, which represents device pacing irrespective of the native rhythm

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