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(CPR) are present during post-implant device testing should the patient require external rescue.
Be aware that the changes in the patient's condition, drug regimen, and other factors may change the
defibrillation threshold (DFT), which may result in nonconversion of the arrhythmia. Successful
conversion of ventricular fibrillation or ventricular tachycardia during arrhythmia conversion testing is no
assurance that conversion will occur post-operatively.
Implantation and Device Programming
Do not position a magnet over the device as that suspends detection and treatment (unless the device
has been programmed to ignore the magnet).
Replace the device when the battery reaches the elective replacement indicator (ERI).
Implant the pulse generator no deeper than 5 cm to ensure reliable data transmission. For patient
comfort, do not implant the pulse generator within 1.25 cm of bone unless you cannot avoid it.
Exercise caution when turning the setscrew, which may be backed out of the connector if turned
counterclockwise for more than two rotations.
Program the device parameters as specified in the Merlin™ PCS on-screen help.
The results of the DAVID Study demonstrated that, for patients with standard indications for ICD
therapy, no indication for cardiac pacing and an EF < 40%, dual-chamber pacing offers no clinical
advantage over backup VVI pacing and may be associated with worsening heart failure.
1
When
1
Wilkoff BL, Cook JR, Epstein AE, Greene L, Hallstrom AP, Hsia H, Kutalek SP, Sharma A. Dual-Chamber Pacing or Ventricular Backup
Pacing in Patients With an Implantable Defibrillator: The Dual Chamber and VVI Implantable Defibrillator (DAVID) Trial. JAMA. December
25, 2002; Vol 288, No. 24:3115-3123.