Cardiac Resynchronization Therapy Defibrillator (CRT-D) / Only the X4 quadripolar CRT-D provides 17 pacing vectors plus industry-leading projected longevity for more streamlined patient care.

Models G156 and G158

  • The DYNAGEN X4 CRT-D features 17 pacing vector options designed to avoid phrenic nerve stimulation and high thresholds.

  • Brings forward the same long lasting battery technology as previous generations of Boston Scientific devices.
  • Includes the new EasyView™ header with color coded lead ports, designed to improve implant efficiency.
  • The world’s thinnest high-energy CRT-D on the market.


Offers an uncompromised set of features

  • An advanced system solution for patient comorbidities and HF monitoring (HF Perspectiv™ report, LATITUDE™ NXT Remote Patient Management* with weight scale and blood pressure sensors, and Respiratory Rate Trend). 
  • AcuShock™Advanced Technology, multiple programmable options to reduce inappropriate and unnecessary shocks, including a choice of rhythm discriminators, antitachycardia pacing (ATP) therapy in all rates zones, and advanced sensing and filtering. 
  • RhythmID™ with RhythmMatch™ to allow customization of Rhythm ID algorithm to reduce inappropriate shocks. 
  • Wireless ECG to save time and simplify follow-up. 
  • SafetyCore™ technology intended to provide lifesaving shock therapy and basic pacing functionality in the event of an unrecoverable fault. 


Mechanical Specifications

Model Type Size (cm)
(W x H x D)
Connector Type
G158 X4 CRT-D 5.37 x 8.18 x 0.99 73.8 32.5 RA:IS-1; RV:DF4; LV:IS4
G156 X4 CRT-D 5.37 x 8.08 x 0.99 73.4 32.0 RA:IS-1; RV:IS-1/DF-1; LV:IS4


Longevity Information

  • For longevity calculations based on different settings please contact Boston Scientific technical services or your local representative.
  • Boston Scientific devices have a limited product warranty of 6 years in available geographies.
  • Devices use Li/MnO2 battery chemistry.
  • The usable battery capacity is 1.9 Amp-hours (typical implant to battery capacity depleted). 
  • Shelf life is 2 years (before use by).