Technical Information


Models G156 and G158

Pacing Therapy

Brady Modes 

Normal: DDD(R), DDI(R), VDD(R), VVI(R), AAI(R), Off


Temporary: DDD, DDI, DOO, VDD, VVI, VOO, AAI, AOO, Off

AT/AF Management  ATR Mode Switch, Ventricular Rate Regulation (VRR) - MIN, MED, MAX, Atrial Flutter Response (AFR), PMT Termination, Rate Smoothing
Rate Adaptive Pacing Accelerometer with sensor trending function

Heart Failure Therapy

Heart Failure Therapy Optimization

Normal: DDD(R), DDI(R), VDD(R), VVI(R), AAI(R), OffSmartDelay™ (AV Optimization), BiV Trigger, LV Offset, LV Sensing

LV Lead Options Quadripolar LV lead
LV Pacing Vector Options 17 options
LV Sensing Vector Options 8 options plus OFF

Patient Diagnostics

Arrhythmia Logbook

Events summary, Stored Electrograms with Annotated Markers, (Intervals and approximately 17 minutes of multichannel EGM, always with 10 seconds Onset and event storage prioritization). Implant activation of all available EGMs. On screen measurement of all stored signal amplitudes and timing

Histograms & Counters Tachy Events and Brady Counters
Heart Rate Variability(HRV) SDANN and HRV Footprint (24 hour heart rate collection period)
Daily Trends For Last 365 Days

Events, Activity Level, Atrial Burden, Respiratory Rate, Heart Rate, SDANN, HRV Footprint, Autonomic Balance Monitor (ABM), Lead impedances and amplitudes


To note: Automatic activation of all available daily trends at implant.

AT/AF Diagnostics  % Atrial Burden, Daily burden, Average V-rate during ATR Mode Switch Episode
Heart Failure Therapy/Diagnostics

HF Perspectiv™ report, Respiratory Rate Trend, Weight, Blood Pressure, Heart Rates, HRV Footprint, SDANN, Atrial Arrhythmia Burden, Activity Level, A & V Arrhythmias, Pacing Histograms


To note: Weight and Blood Pressure are only available via LATITUDE.

Device Testing/Induction Methods

Induction Methods 

Vfib Induction, Shock on T Induction, Programmed Electrical Stimulation (PES), 50 Hz/Manual Burst Pacing

Commanded Therapy Methods Commanded Shock, Commanded ATP

Tachyarrhythmia Therapy


Zones VF only, or VF and VT or VF, VT, VT-1. Lowest Zone can be Monitor Only

Shock Reduction and Appropriate Therapy AcuShock™ Advanced Technology including Onset/Stability™, RhythmID™ with RhythmMatch™, Dynamic Noise Algorithm (DNA) for sensing, Automatic Gain Control (AGC) with programmable sensing floor, Narrow Band Pass Filter
Antitachycardia Pacing Therapy (ATP) Termination Quick Convert™ in VF Zone. Two programmable ATP schemes in both VT and VT-1 zones. Burst, Ramp, Scan, Ramp-Scan
Shock Energy  41 J stored, 35 J delivered. First two shocks in each zone programmable. VT-1 has 5 shocks, VT has 6 shocks and VF has 8 shocks. Reverse Last Shock Polarity in zone. Programmable RV Coil to RA Coil and Can (TRIAD), RV Coil to Can, RV Coil to RA Coil (COLD CAN)

VF Zone (200 bpm)–Detection: Rate and Duration, Therapy: Quick Convert, 8 high energy shocks


VT Zone (160 bpm)–Detection: RhythmID or Onset/Stability, Therapy: ATP x 2, 6 high energy shocks

Implant/In-Clinic Follow Up

Implant Communication Mode

Programmable values: Enable use of ZIP™ telemetry (MICS) (Requires initial use of wand for device ID) or use wand for all telemetry


Nominal: Enable use of ZIP telemetry (Requires initial use of wand for device ID)

In Clinic Follow-Up Wireless ECG

Remote Follow Up

Patient Triggered Monitor (PTM) Triggers the storage of two minutes onset and one minute post - EGMs, intervals, and annotated marker data during a symptomatic episode by placing a magnet over the device
Beeper Feature(Patient Alerts) Beep During Capacitor Charge, Beep when Explant is Indicated, Beep when Lead Impedance measurement(Shock or Pace) is Out-of-Range
Magnet Feature Magnet Response (Off, Store EGM, Inhibit Therapy)
Remote Monitoring This device is designed to be LATITUDE™ enabled; LATITUDE availability varies by region
Wireless Remote follow-up for all devices (MICS)