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What's the Difference Between Monophasic and Biphasic?
1. What are monophasic and biphasic defibrillators?
2. How do monophasic and biphasic defibrillators work differently?
3. Which type of defibrillator is more effective?
Monophasic and biphasic defibrillators are both types of devices used to deliver an electric shock to the heart during cardiac arrest. The main difference between the two is in the waveform of the electric shock they deliver.
Monophasic defibrillators deliver a single-phase waveform, meaning that the electric current flows in one direction. Biphasic defibrillators, on the other hand, deliver a biphasic waveform, which means that the electric current flows in two directions, reversing direction mid-way through the shock.
In practical terms, this means that biphasic defibrillators use less energy to deliver a shock than monophasic defibrillators, as the current flows through the heart more efficiently.
Studies have shown that, in general, biphasic defibrillators are more effective than monophasic defibrillators at restoring the normal rhythm of the heart. This is thought to be due to the fact that the biphasic waveform is better at depolarizing myocardial cells, making it more likely that the shock will succeed in restoring a normal heartbeat.
Despite the higher efficacy of biphasic defibrillators, however, monophasic defibrillators are still widely used in many settings, due to their lower cost and ease of use. In practice, both types of defibrillator are effective at treating cardiac arrest, and the choice between them may depend on factors such as patient age and overall health, as well as the training and experience of the person using the device.
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