<prompt> Left Axis Detion is seen areA Positive in Lead I and Positive in Lead 11B Positive in Lead I and Negative in Lead IIC Negative in Lead I and Negative in Lead IID Negative in Lead I and Positive in Lead II  <response>: 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. 