Monophasic and Biphasic Defibrillator, What is difference in both types of defibrillator- Buyers guide.


What is Defibrillator?

A defibrillator is a medical device that restarts the heart's normal rhythm by shocking or delivering an electrical pulse to the heart. These are employed to prevent or treat an arrhythmia, or irregular, rapid, or slow heartbeat. Defibrillators can also restore the heart's beat if it stops suddenly. Both hospitals and emergency medical personnel utilize defibrillators. When a person's heart stops beating normally, it is called cardiac arrest. In this situation, trained personnel must administer cardiopulmonary resuscitation (CPR) or defibrillation in order to restore normal heart function.  There are two types of defibrillator is available, biphasic defibrillator monophasic defibrillator. The monophasic and biphasic defibrillator difference is that both defibrillators are used in different situations to treat a life-threatening heart rhythm problem for the patient. Monophasic defibrillator and biphasic defibrillator have a similar mechanism, but their pulse sequence is different. In this post, we will discuss the biphasic vs monophasic 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. A monophasic defibrillator machine is more efficient when it comes to delivering shock therapy and is generally considered to be more reliable than a biphasic defibrillator. Monophasic defib can be used to treat a wide variety of cardiac conditions, although they are typically most effective in treating sudden cardiac death and ventricular fibrillation. Since patient impedance cannot be adjusted in this waveform, it is usually suggested that all monophasic monitor shock adult patients with 360 J of energy to ensure that the maximal current is delivered even in the absence of patient impedance detection. The voltage and joules delivered by a monophasic defibrillator are higher than those delivered by a biphasic defibrillator, making it safer for use in people with heart conditions. Another major advantage with monophasic defibrillation is that monophasic defibrillator leads are shorter and therefore easier to handle, but the overall disadvantage of this type of device is that it is less reliable.


How many joules of energy does a monophasic defibrillator have?

The monophasic defibrillator joules energy is 360J, and it is fixed amount of energy with each shock. The energy is delivered in a one-way pulse, so there is no need to adjust the amount depending on the patient's size or weight. The monophasic defibrillator is designed to deliver a strong, high voltage shock to the heart when it depolarizes in an abnormal pattern. The large amount of energy is delivered through the electrodes that are in contact with the heart. This type of defibrillator has a single shock option and can only be used on patients who are not breathing.

List of Bestselling Monophsic Defibrillator:

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, biphasic defibrillator  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. A biphasic defibrillator machine, also known as a dual-chamber defibrillator, is an electrical device that can be used to restart heartbeats in people who have stopped breathing. The first chamber of the biphasic defib monitor is charged with electricity, and when it's activated, it shocks the person's heart. The second chamber of the device containsINSTANT HEART ASSISTANCE (IHA) medications which can help to restart the heart. A biphasic waveform is a type of electrical current that alternates between two different voltages. A biphasic defibrillator uses this waveform to shock the heart in an effort to restore a normal heartbeat. The biphasic shock has been shown to be more effective than traditional monophasic shocks and can be delivered through a smaller shocking device. As a result, biphasic defibrillators are becoming more common in both hospitals and public places.


What is the range of biphasic joules energry?

Biphasic Defibrillator Joules is the amount of electricity needed in order for a defibrillator to properly defibrillate someone. The biphasic joules' energy range between 120 joules - 200 joules, or depend on the patient situation. The biphasic defibrillator is designed to deliver a comfortable and low voltage shock to the heart when it depolarizes in an abnormal pattern. The biphasic energy is delivered through the electrodes that are in contact with the heart. This biphasic monitor has a double shock option and can only be used on patients who are not breathing. Biphasic defibrillator joules per shock energy is depended on the patient situation and types.

List of Bestselling Biphasic Defibrillators:

Difference between Monophasic and Biphasic defibrillator.

The monophasic vs biphasic defibrillator differences are following as below.

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. Biphasic 200 joules max energy can deliver.

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.

First Shock SuccessPrimary shock Monophasic has a 60% success rate in treating cardiac arrest.First shock success rate for biphasic cardiac arrest is 90%

The waveform of the direct current shock might be either monophasic or biphasic. In a monophasic shock, the shock is delivered from one electrode to the next only in one direction. In a biphasic shock, the final portion of the shock reverses the initial shock's direction by switching the polarity of the electrodes. In monophasic and biphasic defibrillator difference, it is a major point. The initial voltage applied is typically greater than the shock from the reversed polarity. Shocks that are biphasic need less energy and are more effective than monophasic shocks. A biphasic defibrillator typically delivers 200 Joules when a monophasic defibrillator delivers 360 Joules for defibrillation. According to the postulated process, not all myocardial cells can be depolarized by a single monophasic wave of energy. While cells farther from the electrode receive too little energy, those closer to it receive too much. These cells can also be swept away by reversing the polarity. This reaction to a biphasic waveform is commonly referred to as its "burping" response. Monophasic and biphasic shock energy are different to each other.

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

Monophasic Versus Biphasic Waveform Defibrillation:

Electrical shocks are delivered from one electrode to another using a defibrillator monophasic waveform. The current moves through two phases when there is a biphasic shock. The patient's heart is used to conduct electricity from the first electrode to the second electrode during the first stage. The current then changes its course and travels through the heart from the second electrode back to the first electrode.

Due to a few factors, smart biphasic defibrillators have become the industry norm. They differ from monophasic defibrillators in several ways, starting with their size and weight. Due in part to biphasic waveforms producing much less current, they have also been demonstrated to be more effective in preventing heart and skin burns.

The first thought is come in mind that biphasic vs monophasic defibrillator joules, which machine has more energy. So that answer is monophasic defibrillator has too much energy than biphasic.

What are the advantages of using biphasic defibrillator over monophasic?

Biphasic Defibrillator: - Biphasic defibrillators are considered latest and advanced in technology. 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.

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.

Conclusion of monophasic biphasic defibrillator

Biphasic manual defibrillators are preferred even if monophasic machines can successfully perform defibrillation. They can stop additional heart damage and are more practical, precise, efficient, and affordable. Biphasic machines may alter impedance to function similarly on a variety of patients and have relatively lower peak current requirements, which reduces the danger of heart injury. Due to the fact that many manufacturers have discontinued making their outdated equivalents, biphasic gadgets are destined to fully take over the planet. Biphasic defibrillator price is directly related to the brand and models.


What is lowest price for Monophasic Defibrillator ? We have requirement of 1 unit.

Hey Hospitals store, Great article. I found this very informative and helpful to understand about the monophasic and biphasic defibrillator.
We were using Monophasic defibrillator in our hospital. This is an old machine. We wanted to buy a new one and reached to here to understand about the difference in both type of defibrillators.
Now i see that buying a Bi-phasic will be a good option. However, i see price of Bi-phsic Defibrillator is just double as compared to Monophasic defibrillator machine. But this is latest.
Thanks for information.

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