Common · Knowledge
Right axis deviation
Medical condition
The electrical axis of the heart is the net direction in which the wave of depolarization travels. It is measured using an electrocardiogram (ECG). Normally, this begins at the sinoatrial node (SA node); from here the wave of depolarisation travels down to the apex of the heart.
From Wikipedia
The electrical axis of the heart is the net direction in which the wave of depolarization travels. It is measured using an electrocardiogram (ECG). Normally, this begins at the sinoatrial node (SA node); from here the wave of depolarisation travels down to the apex of the heart. The hexaxial reference system can be used to visualise the directions in which the depolarisation wave may travel. On a hexaxial diagram (see figure 1): If the electrical axis falls between the values of -30° and +90° this is considered normal. If the electrical axis is between -30° and -90° this is considered left axis deviation. If the electrical axis is between +90° and +180° this is considered right axis deviation (RAD). RAD is an ECG finding that arises either as an anatomically normal variant or an indicator of underlying pathology.
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Left axis deviation
Heart condition
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Sinus rhythm
Any cardiac rhythm where depolarisation of the cardiac muscle begins at the sinus node
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Electrocardiography
Method to record the electrical activity of the heart through passive electrodes placed over the skin.
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QRS complex
Combination of three of the graphical deflections seen on a typical electrocardiogram
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Sinoatrial block
Electrical impulse is delayed or blocked on the way to the atria, thus delaying the atrial bea
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PR interval
The period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization)