CCT Electrocardiography Procedures & Interpretation 2

Question 1

Which ECG finding is most characteristic of Wolff-Parkinson-White (WPW) syndrome?

Accepted Answer

Delta wave with short PR interval

Answer

WPW syndrome is characterized by a delta wave (slurred upstroke of the QRS) and a short PR interval due to an accessory pathway bypassing the AV node.

Question 2

A patient's ECG shows ST elevation in leads II, III, and aVF. Which coronary artery is most likely occluded?

Accepted Answer

Right coronary artery

Answer

ST elevation in leads II, III, and aVF indicates an inferior STEMI, most commonly caused by occlusion of the right coronary artery.

Question 3

What does a QTc interval greater than 500 ms indicate?

Accepted Answer

Significantly increased risk of torsades de pointes

Answer

A QTc >500 ms represents a clinically significant prolongation that markedly increases the risk of the potentially fatal arrhythmia torsades de pointes.

Question 4

Which artifact on an ECG is most commonly caused by patient movement or muscle tremor?

Accepted Answer

Somatic muscle artifact

Answer

Somatic muscle artifact produces irregular, high-frequency deflections on the ECG tracing and results from involuntary or voluntary skeletal muscle activity.

Question 5

In a 12-lead ECG, which lead is considered the best for identifying P-wave morphology?

Accepted Answer

Lead II

Answer

Lead II is oriented closely along the axis of normal atrial depolarization, making P waves most prominent and upright, which is ideal for rhythm analysis.

(CCT) Certified Cardiac Technician Practice Test

(CCT) Certified Cardiac Technician Practice Test

CCT Electrocardiography Procedures & Interpretation 2