Monophasic and Biphasic Defibrillator


What is the Monophasic Defibrillator?

A monophasic defibrillator is a type of defibrillator that only delivers one shock at a time. It delivers a single electrical current from one electrode on one side of the chest to another electrode on the opposite side.


What is the Biphasic Defibrillator?

The biphasic defibrillator delivers two-way shocks in quick succession. As with monophasic defibrillators, the current move from one paddle to the next electrode in the first phase, the first shock is fast and high energy. In the second phase the current flow is reverse, the second is a lower energy shock that helps to resynchronize the heart rhythm.


Each type has its own benefits and drawbacks. Monophasic defibrillators are typically less expensive to operate, but can be less effective in cases of cardiac arrest due to the shorter shock duration.

Difference between Monophasic defibrillator and Biphasic defibrillator.

Basis of Compression




In the current time, monophasic defibrillator's popularity is low.

Biphasic defibrillation is becoming more Popular, and it is used in both implantable and external defibrillators.

Current adjustment for patient impedance

The current of a monophasic defibrillator cannot be adjusted in response to the resistance exerted by the patient's body.

Biphasic defibrillators are more successful since they can change the current according to the patient's impedance. This functionality has been produce by several manufacturers to create various types of biphasic defibrillators.

Strength of the current

The monophasic defibrillator provides fixed current 360 J energy to stop cardiac arrhythmias

Biphasic defibrillators, on the other hand, can vary the current strength manually or automatically, and they require less power than monophasic defibrillators.

Over Successfully

Monophasic defibrillators are less capable.

Biphasic defibrillators are more effective than monophasic defibrillator.

Risk of damaging heart muscles

The monophasic defibrillator has a higher risk of damaging the heart at a higher current than biphasic defibrillators.

This biphasic defibrillator has a low current so that there is less of a chance that it will injure you.

What are the advantages of using a monophasic or biphasic defibrillator?

Monophasic Defibrillator: - The monophasic defibrillator has a higher shock threshold than the biphasic defibrillator. This is because the monophasic defibrillator delivers a greater shock energy than does biphasic defibrillator. Consequently, there is a risk of cardiac injury or burns to the chest near the shock pad sites.

Biphasic Defibrillator: - Because it uses lower energy levels, biphasic defibrillation offers a variety of advantages over single-phasic defibrillation. For the patient, it carries a lower risk of skin burns, less myocardial damage, and more rapid recovery of ejection fraction and blood pressure to baseline.


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