Algorithm: PARAD+TM

Protecting patients for over 20 years.
World's first dual-chamber discrimination algorithm.

Healthcare Professionals Cardiac Rhythm Management Cardiac Rhythm Management Products PARAD+™


PARAD+ is a dual-chamber discrimination algorithm which discriminates ventricular tachycardia from supraventricular tachycardia or sinus tachycardia.

It has been designed with the typical ECG characteristics of the different tachycardia rhythms.
By featuring AF DetectTM, PARAD+is the only discriminator to include beat-to-beat R-R long cycle search to distinguish stable, rapidly conducted AF from VT.

  • Lower inappropriate shock rate ever reported1
  • Best in class 99% specificity2
  • Immediate protection with PARAD+ out-of-the-box settings*

*Not applicable to US devices

Discover the CARAT study

How it works

PARAD+ discriminates ventricular tachycardia from supraventricular or sinus tachycardia based on the following criteria:

  1. RR stability: stable or unstable?
  2. PR association: associated or dissociated? If dissociated, long cycle search is triggered (AF DetectTM).
  3. Level of PR association: N:1 or 1:1?
  4. Acceleration: sudden or gradual?
  5. Origin of acceleration: atrial or ventricular?
PARAD+™ Graph parad plus en 2020 2


In the inappropriate shock reduction study, 1 out of 100 patients implanted with a device featuring PARAD+ received inappropriate shocks over one year: the lowest rate of inappropriate shock ever reported in the medical literature.1

Click here to download the study
PARAD+™ PARAD visual 3

Related products: Platinium™Platinium™ 4LV SonRTM CRT-D; Platinium™ 4LV CRT-D


  1. Ruiz-Granell R, Dovellini EV, Dompnier A, Khalighi K, García-Campo E, Olivier A, Barcelo A, Ritter P. Algorithm-based reduction of inappropriate defibrillator shock: Results of the Inappropriate Shock Reduction wIth PARAD+ Rhythm DiScrimination-Implantable Cardioverter Defibrillator Study. Heart Rhythm. 2019 Sep;16(9):1429-1435.
  2. Hintringer F, Deibl M, Berger T, Pachinger O, Roithinger FX. Comparison of the specificity of implantable dual chamber defibrillator detection algorithms. Pacing Clin Electrophysiol. 2004 Jul;27(7):976-82.