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What is Left Axis Detion is seen are and explain in detail?
Ans. is 'b' i.e., B Positive in Lead I and Negative in Lead II The normal QRS axis lies between -30deg and + 90". Left axis detion is conventionally diagnosed when QRS axis lies more leftward negative than -30". A quick way to assess QRS axis is to look at leads I and II. If the QRS axis is positive in leads 1 and II then the axis is normal. If the QRS complex positive in lead I and negative in lead II left axis detion. If the QRS complex is negative in lead I and positive in lead II right axis detion. Negative QRS complexes in both leads I and II most commonly indicates -4 incorrect positioning of the limb electrodes.