A 60-year-old woman had an ECG
recorded at a local emergency department after an automobile accident. Her
weight was 70 kilograms (154 pounds), and her aortic blood pressure was 140/80
mm Hg. Use this information and the figure below to answer Questions 4143.
41. What is the mean electrical
axis calculated from standard leads I, II, and III shown in the womans ECG?
A) _90 degrees
B) _50 degrees
C) _12 degrees
D) +100 degrees
E) +170 degrees