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%ما هو (من)٪ 1 - تعريف
MEDICAL CONDITION
Right Axis Deviation
.jpg?width=200 "ECG showing right axis deviation")
Right axis deviation
The electrical axis of the heart is the net direction in which the wave of depolarization travels. It is measured using an electrocardiogram (ECG).
Left axis deviation
HEART CONDITION
Left Axis Deviation
In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II.
Screw axis
![The [[Boerdijk–Coxeter helix]] is an example of a screw axis symmetry that is nonperiodic.](https://commons.wikimedia.org/wiki/Special:FilePath/Coxeter helix.png?width=200 "The [[Boerdijk–Coxeter helix]] is an example of a screw axis symmetry that is nonperiodic.")
![3<sub>1</sub> screw axis in crystal structure of [[tellurium]]](https://commons.wikimedia.org/wiki/Special:FilePath/Te chains.png?width=200 "3<sub>1</sub> screw axis in crystal structure of [[tellurium]]")
LINE THAT IS SIMULTANEOUSLY THE AXIS OF ROTATION AND THE LINE ALONG WHICH TRANSLATION OF A BODY OCCURS
Screw axes; Helical axis; Instantaneous helical axis; Twist axis; Screw displacement; Screw operation
A screw axis (helical axis or twist axis) is a line that is simultaneously the axis of rotation and the line along which translation of a body occurs. Chasles' theorem shows that each Euclidean displacement in three-dimensional space has a screw axis, and the displacement can be decomposed into a rotation about and a slide along this screw axis.
ويكيبيديا
Right axis deviation
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° to +90° this is considered normal.
- If the electrical axis is between -30° to -90° this is considered left axis deviation.
- If the electrical axis is between +90° to +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.
