ECC Cardiac Rhythm Recognition & Interpretation 2

Question 1

Ventricular tachycardia (VT) is defined as which of the following?

Accepted Answer

Three or more consecutive PVCs at a rate greater than 100 bpm

Answer

VT is defined as three or more consecutive ventricular complexes at a rate exceeding 100 bpm, originating below the bundle of His.

Question 2

Which ECG change is most specific for ST-elevation myocardial infarction (STEMI)?

Accepted Answer

ST-segment elevation ≥1 mm in two or more contiguous leads

Answer

STEMI is diagnosed when ST-segment elevation ≥1 mm is present in two or more contiguous leads, reflecting transmural myocardial injury in a shared coronary territory.

Question 3

In Mobitz Type II second-degree AV block, what is the hallmark ECG finding?

Accepted Answer

Sudden non-conducted P wave without prior PR interval changes

Answer

Mobitz Type II shows a sudden dropped QRS complex with no preceding PR prolongation, indicating an infranodal block that often progresses to complete heart block.

Question 4

Which cardiac arrest rhythm requires immediate defibrillation as primary treatment?

Accepted Answer

Ventricular fibrillation

Answer

Ventricular fibrillation is a shockable rhythm where early defibrillation is the definitive treatment, as CPR alone cannot restore organized rhythm.

Question 5

Torsades de Pointes is most closely associated with which ECG abnormality?

Accepted Answer

Prolonged QT interval

Answer

Torsades de Pointes is a form of polymorphic ventricular tachycardia that arises in the setting of a prolonged QT interval, which predisposes to early afterdepolarizations.

(ECC) Emergency Cardiovascular Care Certification Practice Test

(ECC) Emergency Cardiovascular Care Certification Practice Test

ECC Cardiac Rhythm Recognition & Interpretation 2