Hall: Guyton and Hall Textbook of Medical Physiology, 12th Edition
Chapter 11: The Normal Electrocardiogram
Test Bank
1. The Q-T interval is the time that approximates the time of ventricular contraction. The
normal Q-T interval is:
A. 0.04 seconds
B. 0.08 seconds
C. 0.16 seconds
D. 0.20 seconds
E. 0.35 seconds
Questions 2-3: A seventy-year old female had an electrocardiogram performed at her annual
checkup, and the following lead II recording was made.
2. What is her heart rate in beats/minute?
A. 68
B. 78
C. 84
D. 94
E. 104
3. According to Einthoven’s Law, if the QRS voltage in her lead III is 0.5 mV, what is the
QRS voltage in Lead I?
A. 0.05 mV
Test Bank
11-2
B. 0.50 mV
C. 1.05 mV
D. 1.25 mV
E. 2.05 mV
4. The P-R interval is the time between the beginning of atrial depolarization and
ventricular depolarization. The normal P-R interval is:
A. 0.04 seconds
B. 0.08 seconds
C. 0.16 seconds
D. 0.20 seconds
E. 0.35 seconds
5. When recording lead I on an EKG, the right arm is the negative electrode and the positive
electrode is the:
A. Left arm
B. Left leg
C. Right leg
D. Left arm + left leg
E. Right arm + left leg