Biomedical Engineering Reference
In-Depth Information
Fig. 9.6
Refinements of two-electrode pacemaker using the refinement chart
pacemaker's sensor starts sensing after the refractory period
(RF)
but pacemaker's
actuator delivers a pacing stimulus when sensing value is greater than an equal to the
standard threshold constant. Sensor-related transitions are available in all operating
modes except AOO, VOO and DOO modes.
Third refinement step (Figs.
9.5
(C),
9.6
(C)) introduces different operating strate-
gies under
hysteresis
interval: if the
hysteresis
mode is TRUE, then the pacemaker
paces at a faster rate than the sensing rate to provide consistent pacing in one cham-
ber (atrial or ventricle) or both chambers (atrial and ventricle), or prevents constant
pacing in one chamber (atrial or ventricle) or both chambers (atrial and ventricle).
In case of FALSE state of
hysteresis
mode of the pacemaker's sensor and actuator
are working in normal state or does not try to maintain the consistent pacing. Hys-
Search WWH ::
Custom Search