CCT Electrocardiography Procedures & Interpretation 4

Question 1

Which of the following correctly describes the placement of the V4 precordial electrode?

Accepted Answer

5th intercostal space, midclavicular line

Answer

V4 is placed at the 5th intercostal space at the midclavicular line, serving as a transition point between septal and lateral precordial leads.

Question 2

An ECG shows a ventricular rate of 150 bpm with a sawtooth baseline pattern and 2:1 conduction. What rhythm is present?

Accepted Answer

Atrial flutter with 2:1 block

Answer

Atrial flutter typically produces a sawtooth (flutter wave) pattern at approximately 300 bpm atrial rate; with 2:1 conduction, the ventricular rate is ~150 bpm.

Question 3

Which ECG change is most associated with digitalis (digoxin) toxicity?

Accepted Answer

Bidirectional ventricular tachycardia

Answer

Bidirectional ventricular tachycardia, where the QRS axis alternates beat-to-beat, is a classic and serious sign of digitalis toxicity.

Question 4

What is the correct paper speed for a standard 12-lead ECG recording?

Accepted Answer

25 mm/sec

Answer

The standard ECG paper speed is 25 mm/sec, which allows accurate measurement of intervals and comparison across recordings.

Question 5

A right bundle branch block (RBBB) pattern on ECG is best identified by which finding?

Accepted Answer

Wide QRS with rSR' (rabbit ear) pattern in V1 and wide S wave in lateral leads

Answer

RBBB produces a wide QRS (≥0.12 s) with an rSR' or RSR' pattern (rabbit ears) in V1 and broad, slurred S waves in leads I, V5, and V6.

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CCT Electrocardiography Procedures & Interpretation 4