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. 2013 Jan 20;18(4):336–343. doi: 10.1111/anec.12038

Figure 2.

Figure 2

Allocation of study subjects. We studied 51 patients that had their devices programmed in VVI mode at 30 ppm. Out of these 51 patients 35 patients were asked to perform deep breathing in order to assess the relationship of VR with SA and the other 16 patients were evaluated to assess the impact of the QRS width on VR.