2. Hypertrophy and enlargement of the heart

Question 1

If the QRS complex is predominantly positive in ____, then the QRS axis must be normal

Answer 1

leads I and aVF

Question 2

A normal QRS axis can lie from what degree to what degree?

Answer 2

• 90 to -30
• but most people consider 90 to 0

Question 3

Can a QRS complexe that are predominantly negative in lead aaVF be normal?

Answer 3

Yes
If QRS complexes in lead I and II are positive