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left axis deviation
Left axis deviation (LAD) is a condition whereby 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.〔http://www.ecglibrary.com/axis.html〕
==Cause==
Common causes of LAD include left ventricular hypertrophy (LVH), left anterior fascicular block (or hemiblock) and inferior myocardial infarction. Less commonly LAD may be a normal variant, particularly in obese or stocky individuals, or it may be associated with Wolff–Parkinson–White syndrome or an ostium primum atrial septal defect.
LVH is generally recognised as a cause of LAD,〔〔〔http://lifeinthefastlane.com/ecg-library/basics/left-axis-deviation/〕 although some sources claim that LVH does not cause LAD.〔〔http://www.fpnotebook.com/cv/exam/LftAxsDvtn.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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