User's Manual

22
Pacing Types – Modes
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Pacing Types – Modes
Closed Loop Modes
Valid for Cylos DR and
Cylos VR
Cylos achieves physiologic rate adaptation using Closed Loop
Stimulation. Closed Loop Modes work the same way as non-rate-
adaptive modes. The only difference is that the basic rate is increased
when Cylos senses that the patient is under stress. Closed Loop modes
are identified by the designation "CLS."
In the DDD-CLS and VVI-CLS modes, the atrial and/or ventricular
refractory period can cover a larger portion of the basic interval with
high closed loop pacing rates. As a result, the sensing of spontaneous
events may be prevented or impossible.
Rate-Adaptive Modes
Valid for
Cylos DR-T
Rate-adaptive modes are marked by an "R" (for "rate") in the pacemaker
code. Rate-adaptive modes function identically to corresponding non-
rate-adaptive modes, with the exception that the basic rate increases
when patient exertion is detected by the motion sensor. The non-rate-
adaptive modes are described below. In rate-responsive demand
modes (DDDR, DDTR/A, DDTR/V, DDIR, DVIR, VDDR, VVIR, AAIR), it is
possible that the atrial or ventricular refractory period can comprise a
major portion of the basic interval at high sensor-modulated rates. As a
result, sensing of intrinsic actions is limited or completely suspended.
For more information, see the "Rate Adaptation" section.