User's Manual

8 Introduction
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Introduction
Cylos is a line of pacemakers that may be used for all indications of
bradycardic arrhythmias. There are three pacemakers in the Cylos
product group. There are single- and dual-chamber pacemakers that
achieve physiological rate adaptation using Closed Loop Stimulation,
1
and a third pacemaker that permits external monitoring via a Home
Monitoring feature.
2
The myocardium contracts differently under different states of load.
Closed Loop Stimulation (CLS) uses these variations to provide the
patient with a physiologic pacing rate that is specific to his or her
needs. The dynamics of the cardiac contractions are evaluated by
unipolarly measuring the intracardiac ventricular impedance. Changes
in the impedance curves over time are directly proportional to the state
of load. By evaluating these changes, the pacemaker then sets the
pacing rate. Closed Loop Stimulation uses ventricular sense (V
S
) and
ventricular pace (V
P
) events in calculating the pacing rate.
A traditional accelerometer is another way Cylos can adapt the pacing
rate. With the accelerometer, which is integrated into the hybrid
circuit, any patient movement generates an electrical signal. This
signal is used as input for controlling how the pacing rate is adapted.
Cylos DR
The dual-chamber pacemaker has separate atrial and ventricular leads
and is suited for patients who need AV-synchronous pacing.
Cylos VR
The single-chamber pacemaker needs just one lead and is only suited
for ventricular pacing.
Cylos DR-T
Cylos DR-T features the complete functionality of Cylos DR and is also
equipped with the Home Monitoring function. For more information,
please see the "Home Monitoring" section.
1
Pacing in a closed loop.
2
An extended telemetry option available in Cylos DR-T