Term
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Definition
| A method of determining the direction of the heart's electrical current flow.
Calculation uses hexiaxial diagram with ends of lines connected to form axis circle.
Normal heart current starts in the sinus node (top right of the heart) and travels toward the left ventricle (bottom left).
Axis Deviation: Current travels in an abnormal direction. |
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Term
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Definition
Normal variant.
MI.
Ventricular hypertrophy.
Dysrhythmias.
Advanced pregnancy or obesity.
Chronic lung disease, pulmonary embolus. |
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Term
| Determining the Axis Quadrant |
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Definition
Look at QRS in leads I and AVF.
Lead I connects right and left arms, tells if axis is on right or left half of axis circle.
AVF on foot, tells if axis is on top or bottom half of axis circle. |
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Term
| Determining the Axis Quadrant (cont'd) |
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Definition
If QRS in I and AVF both positive:Normal axis.
If QRS in I and AVF both negative:Indeterminate axis.
If QRS in I positive and AVF negative:Left axis deviation.
If QRS in I negative and AVF postief |
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