Deck 11: The Normal Electrocardiogram

Question 1

Use the following information to answer Following Questions . A 70-year-old woman had an electrocardiogram performed at her annual checkup, and the following lead II recording was made.
According to Einthoven's Law, if the QRS voltage in lead III is 0.4 mV, what is the QRS voltage in lead I?

A)0.05 millivolts
B)0.50 millivolts
C)1.05 millivolts
D)1.25 millivolts
E)2.05 millivolts

Answer 1

B

Question 2

Use the following information to answer Following Questions . A 70-year-old woman had an electrocardiogram performed at her annual checkup, and the following lead II recording was made.
What is her heart rate in beats per minute?

A)68
B)78
C)84
D)94
E)104

Answer 2

A

Question 3

The Q-T interval approximates the time of ventricular contraction. Which of the following is the normal Q-T interval?

A)0.04 seconds
B)0.08 seconds
C)0.16 seconds
D)0.20 seconds
E)0.35 seconds

Answer 3

E

Question 4

When recording lead II on an electrocardiogram, the negative electrode is placed on the right arm. Where is/are the positive electrode placed?

A)Left arm
B)Left leg
C)Right leg
D)Left arm and left leg
E)Right arm and left leg

Question 5

When recording lead III on an electrocardiogram, where are the negative electrode(s) placed?

A)Left arm
B)Left leg
C)Right leg
D)Left arm and left leg
E)Right arm and left leg