19/07/2024
(LAD) is a common ECG abnormality that can indicate underlying structural heart disease. It occurs when the QRS axis is between -30° and -90°, as opposed to the normal axis of -30° to +90°. In this case, the QRS vector is directed upward and to the left.
PubMed
Left axis deviation
NCBI
Electrical Right and Left Axis Deviation - StatPearls - NCBI
Jan 8, 2024 — The normal axis is between -30° and +90°. The QRS vector is directed downward a...
LITFL
ECG Axis Interpretation - LITFL
Abnormal axis deviation, indicating underlying pathology, is demonstrated by: Left Axis De...
LAD can be caused by a number of conditions, including:
Congenital heart disease
Endocardial cushion defects, such as atrial septal defect, AV canal, and common atrium, are common causes in patients with congenital heart disease. LAD can also occur in about 4% of patients with an isolated ventricular septal defect.
Left ventricular hypertrophy (LVH)
Uncontrolled high blood pressure is the most common cause of LVH, which can lead to irregular heart rhythms and heart failure. Treatment depends on the cause and may include medications or surgery.
Other conditions
LAD can also be caused by left anterior fascicular block, inferior wall myocardial infarction, emphysema, and mechanical shift due to an elevated diaphragm from obesity.
This is for informational purposes only. For medical advice or diagnosis, consult a professional. Generative AI is experimental.