ECG ECG in Clinical Practice 2

Question 1

A patient presents with chest pain and the ECG shows ST-segment elevation in leads II, III, and aVF. Which coronary artery is most likely involved?

Accepted Answer

Right coronary artery

Answer

Leads II, III, and aVF represent the inferior wall, which is most commonly supplied by the right coronary artery.

Question 2

When performing a 12-lead ECG, where should the V1 electrode be placed?

Accepted Answer

Fourth intercostal space, right sternal border

Answer

V1 is placed in the fourth intercostal space at the right sternal border.

Question 3

A technician notices a wandering baseline on the ECG tracing. What is the most likely cause?

Accepted Answer

Patient movement or respiration

Answer

A slow, undulating (wandering) baseline is typically caused by patient movement or breathing.

Question 4

Which of the following best describes atrial fibrillation on an ECG?

Accepted Answer

Irregularly irregular rhythm with no distinct P waves

Answer

Atrial fibrillation shows an irregularly irregular ventricular response with absent discrete P waves.

Question 5

What is the standard paper speed for a routine ECG recording?

Accepted Answer

25 mm/second

Answer

The standard ECG paper speed is 25 mm per second.

ECG (Electrocardiogram) Practice Test