User's Manual

36 – US-ENGLISH
The PARADYM RF DR 9550 can serve as a defibrillation electrode
(active housing) with a total surface area of 76 cm².
The PARADYM RF DR 9550 is designed to recognize and treat slow
or fast VT and VF by continuously monitoring atrial and ventricular
activity to identify persistent ventricular arrhythmias and to deliver
appropriate therapies. PARADYM RF DR 9550 features the
PARAD/PARAD+ algorithm, which is specifically designed to
differentiate ventricular tachycardias from fast rhythms of
supraventricular origin. PARAD/PARAD+ continuously monitors R-R
interval stability, searches for long cycles, assesses the degree of P-
R association, evaluates sudden onset and determines the chamber
of arrhythmia acceleration.
In addition to the advanced detection scheme, PARADYM RF DR 9550
offers programmable dual or single-chamber pacing therapy (DDD,
DDI, VVI or SafeR modes) with or without rate-responsive
capabilities (DDDR, DDIR, VVIR, DDD/DDIR and SafeR-R modes)
using an acceleration sensor. An automatic AV delay algorithm as
well as a mode switching function are available.
PARADYM RF DR 9550 offers tiered therapy. Therapies can be
programmed independently in each zone:
 in the Slow VT and VT zones: two ATP programs, up to two
shocks with programmable energy and up to four shocks with
maximum energy can be programmed;
 in the VF zone: one ATP program, up to two shocks with
programmable energy and up to four shocks with maximum
energy can be programmed.
When the rhythm changes from one zone to another, the device
delivers the therapy programmed in this zone, starting with the same
or more aggressive program for the area. The ATP program in the
VF zone will only be applied if the VT coupling interval is longer than
the programmed fast VT cycle length.