What does axis deviation mean on ECG?
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.
What determines axis deviation?
The most efficient way to estimate axis is to look at LEAD I and LEAD aVF. Examine the QRS complex in each lead and determine if it is Positive, Isoelectric (Equiphasic) or Negative: A positive QRS in Lead I puts the axis in roughly the same direction as lead I.
How do you determine left axis deviation on ECG?
See the ECG basics section on determining axis for details. If the QRS is upright in lead I and downward (negative) in lead aVF, then the axis is between 0 and -90 degrees, likely left axis deviation.
What does left and right axis deviation mean?
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).
Why did the ECG show a left axis deviation?
Left axis deviation occurs when the QRS axis falls between -30 and -90. There are a variety of causes, including left anterior fascicular block and left ventricular hypertrophy. See the ECG basics section on determining axis for details.
Is left axis deviation a heart disease?
The results were that the development of left axis deviation in men 40 to 59 yr of age, independent of blood pressure is a significant predictor of ischemic heart disease events that are usually manifest 5 to 10 yr after the onset of this electrocardiographic abnormality.
What is left and right axis deviation?
Right Axis Deviation = QRS axis greater than +90° Normal Axis = QRS axis between -30° and +90° Left Axis Deviation = QRS axis less than -30°