What is Biphasic Defibrillator and What is the role of a biphasic defibrillator in Defibrillation?


Biphasic Defibrillator

The biphasic defibrillators deliver current in two directions opposite of a monophasic defibrillator. 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. 

Monophasic V/s Biphasic Waveform

When using a monophasic defibrillator, their waveform delivers electrical shocks in a single direction from one electrode to another. A biphasic shock involves two phases of current flow. In first phase, the current deliver one electrode to second electrode by patient heart. Then, the current flow reverse direction and runs from the second electrode back to the first via the heart.

Biphasic defibrillator now very popular defibrillator in hospital and clinics, during the treatment of cardiac arrest. Biphasic defibrillator are small and lightweight to monophasic defibrillator, and they have been demonstrated to be more effective in preventing heart and skin burns, in part because biphasic waveforms provide a lot less current.

There are many differences between monophasic and biphasic defibrillator, and this is one of the difference of monophasic and biphasic.


Biphasic Defibrillator Used For

This will help to ensure that the heart is restarted successfully in more cases. Because it uses less energy than traditional defibrillation, biphasic defibrillation has several advantages, particularly for the patient. It does not produce as many skin burns as cardioversion, less cardiac damage occurs in the patient, and there's immediate restoration of the heart's function. Biphasic defibrillation uses two separate electric shocks. First, the device delivers a high-voltage current to the heart muscle (primary shock). The second shock is delivered within a few milliseconds of the first, but with a lower voltage. This technique enables the device to restart the heart without causing too much damage or pain.

What is a biphasic defibrillator joules range?

In biphasic defibrillator the joule is  usually joules range between 120 joules to 200 joules or depend on the patient situation, and monophasic defibrillator this is usually 360 joules it is maximum amount of current. The biphasic defibrillator is manufactured to deliver a convenient and lower voltage shock to the heart when it depolarizes in a rare pattern. The energy of biphasic is delivered through the electrodes by patient heart. Biphasic Defibrillators prevent the heart from fibrillation. It delivers a shock to the patient's heart that is in ventricular fibrillation.

Advantage of Biphasic Defibrillator

Biphasic defibrillators are thought to be the newest and most cutting-edge technology. Biphasic defibrillation has a number of benefits over single-phasic defibrillation, since it consumes less energy. The risk of skin burns, cardiac injury, and the time it takes for the patient to return to baseline blood pressure and ejection fraction are all reduced. The Primary Function of the Biphasic Defibrillator Monitor is to physically watch any vital sign such as ECG, pulse oximetry, noninvasive blood pressure, and capnography, showing that the medical professional may review and interpret patient data on the device's screen to diagnose a medical problem of patient.

Disadvantage of Biphasic Defibrillator.

  • The Biphasic Defibrillator Monitor E-Heart was developed for warranted clinical monitoring applications, if properly operated by trained individuals and if used in an appropriate medical facility.
  • The operator must proceed with the device and accessories condition checking’s (regular drills) and make sure all the accessories are functioning properly before actually using the device.
  • The use of the Biphasic Defibrillator Monitor E-Heart is restricted to one single patient per time, and it is a non-continuous use device.
  • Do not touch the patient, the bed (or stretcher), the device or any other accessory connected to the patient, during the electrical discharge (shock).
  • To prevent from fire and shock risk, avoid operating or place the device close to any type of water source and avoid liquids over its plastic case.
  • Risk of electrical shock if the plastic case is open. All types of service or future updating of this device, can only be carried out by trained personnel and after authorized by US DEFIB.


In conclusion, biphasic defibrillation is a safe and effective way to treat cardiac arrest. It has several advantages over traditional monophasic defibrillation, including a wider joule range and the ability to treat patients with both low and high energy shocks. However, there are a few disadvantages to consider, such as the higher cost of biphasic defibrillators and their larger size.


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