PMC6192132_01
DDD pacing followed by VVI pacing showing an underlying rhythm of complete heart block.
CRIC2018-6195045.001.jpg
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fig1
Interrogation of the CRT-D device in December 2011 (as well as subsequent device checks) revealed that the patient had evidence of complete heart block with no escape rhythm at ventricular backup rate of 40 (Figure 1 EKG).
Pacing in asynchronous (DOO) mode with oversensing (marker annotations not affecting pacing mode) seen prior to the A paced marker.
CRIC2018-6195045.002.jpg
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fig2
The device was reprogrammed to nonsensing mode (DOO) allowing consistent pacer function of the ICD (Figure 2 IEGM).