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CCT - Practice Test Questions and Answers (100% Pass)
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CCT - Practice Test Questions and Answers (100% Pass)
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©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Wednesday, July 31, 2024 9:10 AMCCT - Practice Test Questions and Answers (100% Pass)
1. Which heart chamber functions to pump deoxygenated blood to the lungs?
a. Right atrium
b. Right ventricle
c. Left atrium
d. Left ventricle - ✔️✔️1. B: The right ventricle pumps the deoxygenated blood it has
received from the right atrium to the lungs. The right atrium pumps deoxygenated blood
from the body to the right ventricle. The left atrium pumps oxygenated blood from the
lungs to the left ventricle. The left ventricle pumps oxygenated blood to the body.
2. Which lead is the most affected by respiration?
a. V2
b. V4
c. Lead III
d. Lead I - ✔️✔️2. C: Lead III is the most affected by respiration, and therefore the
waveforms may look different depending on the respiratory cycle. Because of this, a Q
wave that only appears in lead III and is not associated with other corresponding
changes in other leads is not significant.
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,©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Wednesday, July 31, 2024 9:10 AM
3. Which of the following is the correct sequence by which action potentials are
conducted through the heart?"
a. SA node → AV node → bundle branches → Purkinje fibers
b. Bundle branches → Purkinje fibers → SA node → AV node
c. Purkinje fibers → SA node → bundle branches → AV node
d. AV node → SA node → bundle branches → Purkinje fibers - ✔️✔️3. A: The sequence
by which an action potential is conducted through the heart is from the sinoatrial (SA)
node to the atrioventricular (AV) node to the bundle branches and then to the Purkinje
fibers.
4. What type of heart block is seen in the following electrocardiogram (ECG) strip?"
a. First-degree heart block
b. Second-degree heart block, type 1
c. Second-degree heart block, type 2
d. Third-degree heart block - ✔️✔️4. B: The pictured ECG is a second-degree heart
block, type 1. This rhythm is also called Mobitz I or Wenckebach. With this heart block
the PR interval gets longer with each beat until eventually a P wave occurs, but a QRS
does not follow (a beat is skipped). After the skipped beat, the pattern starts over again.
A first-degree heart block occurs when the PR interval is longer than 0.2 seconds, but
the PR interval generally remains constant and the QRS is not dropped. A second-
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, ©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Wednesday, July 31, 2024 9:10 AM
degree heart block, type 2, also called Mobitz II, is apparent when the QRS suddenly
fails to show up after a P wave. A fairly consistent ratio of P waves to QRS complexes is
common, and this rhythm lacks the increasing PR interval that is seen in the Mobitz I
block. A third-degree heart block is also called a complete heart block and the atria and
ventricles beat independently of one another.
5. When calibrating an ECG machine, what is the standard size of the calibration mark
representing the sensitivity of the ECG machine?
a. 5 mm in height
b. 10 mm in height
c. 15 mm in height
d. 20 mm in height - ✔️✔️5. B: The calibration mark representing the sensitivity of the
ECG should be 10 mm in height (two large squares). This mark is usually found on the
left side of the page at the beginning of each line of the ECG. When this is set correctly
it means that for every millivolt measured from the patient, a deflection of 10 mm will be
recorded on the trace.
6. Which of the following is the mechanism of action of nitrates?
a. Decrease the responsiveness of heart to the sympathetic nervous system
b. Lower the heart rate
c. Decrease cardiac contractility
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