Page 43 - ractice Exam Questions and rationales

The pictured rhythm is an example of which of the following?

A. atrial flutter

B. premature ventricular contraction

C. sinus bradycardia

D. ventricular tachycardia

Your response:
premature ventricular contraction
Correct response:
premature ventricular contraction
Rationale: The rhythm is an example of a premature ventricular contraction, as shown by the
abnormal QRS complex. This occurs when the ventricles produce an extra heartbeat, and in turn,
disrupt the normal rhythm of the heart. An atrial flutter is an abnormal heartbeat that occurs in
the atria, and can be seen as an abnormal P-wave on a rhythm strip. Sinus bradycardia is when
the patient has a regular heartbeat, but it is slower than normal. Ventricular tachycardia is a fast
heartbeat that begins in the ventricles, and is a common cause of heart attacks.
Which of the following ECG leads records the electrical activity of the inferior surface of the
left ventricle and is closest to the heart?

A. lead I

B. aVR

C. lead II

D. aVL

Your response:
aVL
Correct response:
lead II
Rationale: Lead II records tracings between the right arm and left leg. This is the lead recorded
on a rhythm strip at the bottom of a 12 lead ECG.
What does the color of an evacuated collection tube represent?

A. a visual identifier for tests expected to be above or below normal range

B. the minimum volume of blood to be obtained

C. the personal protective equipment required for collection