User's Manual

Table Of Contents
Appropriate l ead connections. When implanting a system which uses both a DF4-LLHH/LLHO and
IS4-LLLL lead, ensure that the leads are inserted and secured in the appropriate ports. Inserting a lead
into an incorrect port will result in unanticipated device behavior (potentially leaving the patient without
effective therapy).
Programming and Device Operations
Atrial tracking modes. Do not use atrial tracking modes in patients with chronic refractory atrial
tachyarrhythmias. Tracking of atrial arrhythmias could result in ventricular tachyarrhythmias.
Atrial-only modes. Do not use atrial-only modes in patients with heart failure because such modes do
not provide CRT.
Ventricular sensing. Left ventricular lead dislodgement to a position near the atria can result in atrial
oversensing and left ventricular pacing inhibition.
•SlowVT.Physicians should use medical discretion when implanting this device in patients who present
with slow VT. Programming therapy for slow monomorphic VT may preclude CRT delivery at faster rates
if these rates are in the tachyarrhythmia zones.
Post-Implant
Protected environments. Advise patients to seek medical guidance before entering environments that
could adversely affect the operation of the active implantable medical device, including areas protected
by a warning notice that prevents entry by patients who have a pulse generator.
Magnetic Resonance Imaging (MRI) exposure. Do not expose a patient to MRI scanning. Strong
magnetic elds may damage the pulse generator and/or lead system, possibly resulting in injury to
or death of the patient.
•Diathermy.Do not subject a patient with an implanted pulse generator and/or lead to diathermy since
diathermy may cause brillation, burning of the myocardium, and irreversible damage to the pulse
generator because of induced currents.
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