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 ...
This patient had severe mitral stenosis from rheumatic mitral valve disease causing massive left atrial enlargement. Note the morphology of the PVC in lead V1. The R is greater than the R' in a right ...
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