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Abnormal axis deviation, indicating underlying pathology, is demonstrated by: Left Axis Deviation = QRS axis less than -30°. Right Axis Deviation = QRS axis greater than +90°. Extreme Axis Deviation = QRS axis between -90° and 180° (AKA “Northwest Axis”).
Cardiac axis represents the overall direction of electrical activity as it spreads through the cardiac conduction system. In other words, it represents the net effect of all generated action potentials within the heart.
ECG features and causes of left axis deviation (LAD) using the hexaxial reference system. QRS axis between -30 and -90 degrees
Identify the key components of electrical axis deviation on an electrocardiogram. Differentiate between right-axis deviation and left-axis deviation based on electrocardiogram patterns. Apply knowledge of vector analysis to interpret electrocardiograms and determine the electrical axis.
Electrical axis deviation refers to the abnormal direction of the electrical activity in the heart. This comprehensive article aims to provide a thorough understanding of electrical right and left axis deviation, including their causes, diagnosis, and clinical significance.
ECG features, aetiology and list of causes of right axis deviation (RAD) Hexaxial reference system QRS axis between +90° and + 180°.
The electrical axis of the heart (heart axis). As evident from the figure, the normal heart axis is between –30° and 90°. If the axis is more positive than 90° it is referred to as right axis deviation. If the axis is more negative than –30° it is referred to as left axis deviation.
The axis of the ECG is the major direction of the overall electrical activity of the heart. It can be normal, leftward (left axis deviation, or LAD), rightward (right axis deviation, or RAD)...
What is Axis? You’ll often hear people refer to “axis” when interpreting ECGs. They are typically talking about the mean QRS axis, which is the direction of net ventricular depolarization represented as an angle in the frontal plane.
The axis of an ECG is the average direction of electrical movement through the heart during a depolarization. More specifically, axis usually refers to the mean QRS vector, which is the size and direction of the depolarization wave as it moves through the ventricles.