Ch. 8 EKG Exam Review

1 Stroke volume is a measure of

• The amount of blood pumped with each heartbeat
• How many times the heart beats each minute
• The amount of oxygen exchanged for carbon dioxide in the lungs
• The amount of blood pumped by the heart in one minute

2 Problems with the electrical system of the heart can cause this abnormality:

• A lack of blood to pump through the body
• Myocardial infarction
• Extremely slow heart rate
• A lack of oxygen in the blood

3 The rate at which any particular site in the cardiac conduction system conducts electrical impulses is called

• Rapid rate
• Cardiac rate
• Intrinsic rate
• Pacing rate

4 The primary pacemaker of the heart is the

• Sinus node
• AV node
• AV junction
• Aorta

5 What generally happens when the SA node fails to initiate an electrical impulse?

• The individual experiences myocardial infarction.
• Another area of the conduction system initiates an impulse.
• The individual experiences a sensation of electrical shock.
• CPR must be performed.

6 Which of the following is true of the intrinsic rates of conductive areas below the SA node?

• Their intrinsic rates are higher than the intrinsic rate of the SA node.
• Their intrinsic rates are about the same as the intrinsic rate of the SA node.
• Their intrinsic rates are lower than the intrinsic rate of the SA node.
• Their intrinsic rates may be higher or lower, depending on the individual.

7 A common name for the isoelectric line on an EKG tracing is

• The base segment
• The foundation
• The baseline
• The rhythm strip

8 What are the names of the five waves most commonly seen on EKG strips?

• First, second, third, fourth, and fifth waves
• A, B, C, D, and E waves
• V, W, X, Y, and Z waves
• P, Q, R, S, and T waves

9 What EKG feature corresponds to the contraction of the ventricles?

• P wave
• QRS complex
• T wave
• U wave

10 What marks a normal ST segment?

• It stays at the baseline.
• It stays parallel to baseline, but higher.
• It stays parallel to the baseline, but lower.
• It shows first a positive, then a negative deflection.