Normal QRS axis: (A) +30 to 110deg, (B) -30 to 110deg, (C) +110deg to +150deg, (D) - 110deg to - 150deg
Answer is B. Ans. (b) -30 to 110degRef: Ganong, 25th ed/p.524Normally, the QRS axis ranges from -30deg to +100degAxis more negative than -30deg is called left axis deviationAxis more positive than +100deg is called right axis deviation