CCT Electrocardiography Procedures & Interpretation 5

Question 1

Which of the following rhythms is defined by an atrial rate of 400–600 bpm with an irregularly irregular ventricular response?

Accepted Answer

Atrial fibrillation

Answer

Atrial fibrillation is characterized by chaotic atrial activity at 400–600 bpm with no distinct P waves and a completely irregular ventricular rate.

Question 2

In left bundle branch block (LBBB), which lead shows a broad monophasic R wave without a septal Q wave?

Accepted Answer

Lead V6

Answer

In LBBB, lead V6 (and lateral leads I, aVL) shows a broad, notched, monophasic R wave with absence of the normal septal Q wave.

Question 3

A CCT observes a patient's ECG with sudden onset of wide, bizarre QRS complexes at 180 bpm, with AV dissociation. What is the most likely rhythm?

Accepted Answer

Ventricular tachycardia

Answer

Ventricular tachycardia presents with wide, bizarre QRS complexes at ≥100 bpm and AV dissociation (independent P waves and QRS complexes) is a distinguishing feature.

Question 4

Which ECG finding is most consistent with acute pericarditis?

Accepted Answer

Diffuse concave (saddle-shaped) ST elevation in multiple leads with PR depression

Answer

Acute pericarditis classically shows diffuse, concave (saddle-shaped) ST elevation in nearly all leads with PR segment depression, reflecting global pericardial inflammation.

Question 5

What electrode placement error causes the ECG to show inverted P waves and QRS complexes in lead I with a positive aVR?

Accepted Answer

Left arm and right arm lead reversal

Answer

Swapping the left arm (LA) and right arm (RA) electrodes causes lead I to be inverted and aVR to appear positive — the mirror image of normal.

(CCT) Certified Cardiac Technician Practice Test

(CCT) Certified Cardiac Technician Practice Test

CCT Electrocardiography Procedures & Interpretation 5