ECG ECG Interpretation 2

Question 1

Which ECG finding is characteristic of atrial fibrillation?

Accepted Answer

Irregularly irregular rhythm with no P waves

Answer

Atrial fibrillation shows an irregularly irregular ventricular rhythm with fibrillatory baseline waves replacing organized P waves.

Question 2

A prolonged QT interval increases the risk of:

Accepted Answer

Torsades de pointes

Answer

Prolonged QT interval can lead to torsades de pointes, a dangerous polymorphic ventricular tachycardia that can degenerate into ventricular fibrillation.

Question 3

Which lead is best for identifying atrial activity?

Accepted Answer

Lead V1

Answer

Lead V1, positioned over the right sternal border, is closest to the atria and provides the best visualization of P waves and atrial activity.

Question 4

What ECG change is seen with hyperkalemia?

Accepted Answer

Peaked T waves

Answer

Elevated potassium levels cause tall, peaked T waves as one of the earliest ECG manifestations, progressing to widened QRS and sine wave pattern if severe.

Question 5

What does sinus rhythm mean on an ECG?

Accepted Answer

The heart rhythm originates from the SA node

Answer

Sinus rhythm means the electrical impulse originates from the sinoatrial node, the heart's natural pacemaker, producing a normal, regular rhythm with consistent P waves before each QRS.

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ECG ECG Interpretation 2