Final answer:
The biphasic method is a technique used to determine the mean electrical axis of the heart by analyzing the QRS complex on an ECG. It involves identifying the major positive and negative deflections and calculating the angle between the major deflection and a reference axis. This method is useful in diagnosing heart conditions.
Step-by-step explanation:
The biphasic method is a technique used to determine the mean electrical axis of the heart. It involves analyzing the direction and amplitude of the QRS complex on an electrocardiogram (ECG). The mean electrical axis represents the average direction of the electrical activity in the heart.
To determine the mean electrical axis using the biphasic method, you need to identify the major positive and negative deflections in the QRS complex. The deflection with the greatest amplitude is considered the major deflection. The mean electrical axis is then calculated by taking the angle between the major deflection and the standard reference axis, which is usually the positive end of lead I.
For example, if the major deflection is positive and the angle between the major deflection and the reference axis is 45 degrees, the mean electrical axis is 45 degrees. The biphasic method allows for a quick and easy assessment of the mean electrical axis, which can help in diagnosing certain heart conditions.