Left axis deviation (LAD) occurs when additional electrical forces move to the left or when the time required for the electrical activity to move over the ventricle is prolonged.
LAD is the most common ECG abnormality occurring in almost 10% of the adult population. LAD is considered normal in pregnant women and those with emphysema. A tall, thin person will have a fairly vertical heart showing a right axis shift. A short, broad person will have a fairly horizontal heart showing a left axis shift.
Other causes of LAD include:
Left anterior hemiblock
Inferior myocardial infarction (inferior wall heart attack)
Hyperkalaemia (high potassium)
Wolff Parkinson White syndrome
Ostium primum atrial septal defect
Left bundle branch block
Left ventricular conduction defects
Left atrial hypertrophy
Right ventricular ectopic rhythms
Chronic Obstructive Pulmonary Disease (COPD)
Ascites (fluid in the abdominal cavity)
Hypertension (high blood pressure)
Aortic stenosis or regurgitation
Left ventricular hypertrophy (some sources claim that LVH does not cause LAD)
Copyright 1994-2016 MedHelp International. All rights reserved.
MedHelp is a division of Aptus Health.
This site complies with the HONcode standard for trustworthy health information.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.