Comprehensive Hca Telemetry & Ecg Interpretation Certification Practice Test

COMPREHENSIVE HCA TELEMETRY
& ECG INTERPRETATION
CERTIFICATION PRACTICE TEST
150 questions · 6 sections · 25 questions per section

SECTION 1: ECG Fundamentals and Cardiac Electrophysiology
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Question 1. What is the primary function of the sinoatrial (SA) node?
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A. To delay electrical conduction between the atria and ventricles
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B. To initiate the electrical impulse that normally controls heart rate
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C. To generate ventricular contraction directly
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D. To prevent atrial depolarization
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Correct Answer: B m m




Rationale: The SA node is the heart's natural pacemaker. It normally init
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iates electrical impulses that spread through the atria and establish the
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mheart's rhythm. m




Question 2. Which structure normally receives electrical impulses from
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the SA node before they travel to the ventricles?
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A. Purkinje fibers
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B. Bundle branches
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C. Atrioventricular (AV) node
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D. Ventricular myocardium
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Correct Answer: C m m




Rationale: The AV node receives impulses from the atria and briefly del
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ays conduction, allowing the ventricles time to fill before ventricular co
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ntraction.

,Question 3. What does the P wave represent on a normal ECG?
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A. Ventricular repolarization
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B. Atrial depolarization
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C. Ventricular depolarization
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D. Atrial repolarization
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Correct Answer: B m m




Rationale: The P wave represents electrical activation (depolarization) o
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f the atrial myocardium before atrial contraction.
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Question 4. Which ECG component represents ventricular depolarizatio
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n?
A. P wave
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B. PR interval
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C. QRS complex
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D. T wave
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Correct Answer: C m m




Rationale: The QRS complex represents ventricular depolarization, whic
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h precedes ventricular contraction.
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Question 5. What does the T wave represent?
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A. Atrial depolarization
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B. Ventricular repolarization
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C. Ventricular depolarization
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D. AV nodal conduction
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Correct Answer: B m m

,Rationale: The T wave represents ventricular repolarization, when ventr
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icular myocardial cells recover electrically after depolarization.
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Question 6. Which ECG interval measures conduction time from the be
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ginning of atrial depolarization to the beginning of ventricular depolariz
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ation?
A. QT interval
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B. ST interval
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C. PR interval
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D. RR interval
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Correct Answer: C m m




Rationale: The PR interval extends from the beginning of the P wave to
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the beginning of the QRS complex. It reflects atrial and AV conduction t
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ime.
Question 7. What is the normal PR interval in an adult?
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A. 0.04–0.08 seconds
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B. 0.12–0.20 seconds
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C. 0.22–0.30 seconds
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D. 0.30–0.40 seconds
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Correct Answer: B m m




Rationale: A normal adult PR interval is approximately 0.12–
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0.20 seconds. A prolonged PR interval may indicate first-
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degree AV block. m m




Question 8. What is the normal duration of a narrow QRS complex?
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A. Less than 0.12 seconds
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B. 0.16–0.20 seconds
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, C. 0.20–0.30 seconds
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D. Greater than 0.30 seconds
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Correct Answer: A m m




Rationale: A normal QRS duration is generally 0.06–
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0.10 seconds and is considered narrow when less than 0.12 seconds.
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Question 9. Which electrical event is represented by the QT interval?
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A. Atrial depolarization only
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B. Ventricular depolarization and repolarization
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C. AV nodal delay only
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D. Atrial repolarization only
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Correct Answer: B m m




Rationale: The QT interval extends from the beginning of the QRS comp
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lex to the end of the T wave. It represents the total time for ventricular
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electrical activation and recovery.
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Question 10. Which electrolyte abnormality is particularly associated wi
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th prolonged QT intervals?
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A. Hypernatremia
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B. Hypocalcemia
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C. Hyperchloremia
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D. Hypermagnesemia
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Correct Answer: B m m




Rationale: Hypocalcemia can prolong the QT interval, particularly by len
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gthening the ST segment. Hypokalemia and hypomagnesemia can also
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contribute to QT prolongation. m m m