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High-Current Rectilinear Biphasic Waveform


Improved efficacy with lower energy is the promise of biphasic waveforms. But not all biphasic waveforms are created equal.


The high-current ZOLL Rectilinear Biphasic™ waveform (RBW) provides more current than the “high-energy” biphasic others use. This capability is particularly important for the difficult-to-defibrillate, high-impedance patient.

High-current Rectilinear Biphasic is the only biphasic waveform that was developed specifically for external defibrillation. Both high-and low-energy biphasic truncated exponential (BTE) waveforms were adapted from internal defibrillation. RBW has been studied extensively in over 7,000 patients and shown to be superior to monophasic. The high-current ZOLL RBW is the only waveform that the FDA has cleared to claim superiority* over monophasic waveforms. 

  • Cardioversion of atrial fibrillation 

  • Defibrillation of ventricular fibrillation in high impedance patients 

  • Defibrillation of ventricular fibrillation in out-of-hospital cardiac arrest in an ACLS environment 

What makes the Rectilinear Biphasic Waveform (RBW) Different?


The scientific community and defibrillator manufacturers all agree - current defibrillates the heart.


"The essential requirement for electrical ventricular defibrillation is the attainment of a sufficient current density." WA Tacker


At 200 J, the ZOLL RBW delivers more average current to high impedance patients than any other biphasic waveform - even ones that have higher energy settings. 


Read on to uncover the unique advantages of ZOLL's Rectilinear Biphasic waveform:


Principles of Electricity 
More Current at 200 J than other biphasic waveforms at 360 J 
New Control for Patient Impedance 
Optimal Duration for Defibrillation Shocks 
Superior for Cardioversion of Atrial Fibrillation 
Superior for Defibrillation of Ventricular Fibrillation 
Superior for Defibrillation of Out-of-Hospital Cardiac Arrest 
Pediatric Biphasic Recommendations 


*The data demonstrates the equivalent efficacy of low energy rectilinear biphasic shocks compared to standard high energy monophasic shocks for transthoracic defibrillation for all patients in VT/VF at the 95% confidence level.  The data also demonstrate the superior efficacy of low energy rectilinear biphasic shocks compared to standard high energy monophasic shocks in patients in VT/VF with high transthoracic impedance at the 90% confidence level.

Rectilinear Biphasic Technology