An unusual form of “pacemaker mediated tachycardia”

Published:November 04, 2013DOI:
      A 60-year-old woman underwent dual-chamber pacemaker implantation for sinus node dysfunction. The device was programmed to DDDR at a base rate of 60 bpm and a maximum sensor rate of 120 bpm. The initial device settings are listed in Table 1.
      Table 1Device program settings
      Mode DDD
      Lower rate limit 60 ppm
      Maximum tracking rate 120 ppm
      Maximum sensor rate 120 ppm
      Paced AV delay 200–350 ms
      Sensed AV delay 200–350 ms
      A-refractory (PVARP) 250 ms
      V-refractory (VRP) 230–250 ms


      LRI (lower rate interval), RSD (rate smoothing down), RVAC (right ventricular automatic capture)


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      1. Rate Smoothing and Automatic Capture Interaction. Boston Scientific Corporation, Natick, Massachusetts, United States, 2012. Available at: Accessed July 18, 2012.