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

Left anterior descending artery

Answer

Left circumflex artery

Answer

Left main 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

Fourth intercostal space, left sternal border

Answer

Fifth intercostal space, midclavicular line

Answer

Second intercostal space, 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

Electrical interference from equipment

Answer

Reversed limb leads

Answer

Low battery in the machine

Question 4

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

Accepted Answer

Irregularly irregular rhythm with no distinct P waves

Answer

Regular rhythm with sawtooth waves

Answer

Regular rhythm with widened QRS

Answer

Regular rhythm with prolonged PR interval

Question 5

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

Accepted Answer

25 mm/second

Answer

10 mm/second

Answer

50 mm/second

Answer

5 mm/second

Question 6

A tall, tented T wave is most classically associated with which electrolyte abnormality?

Accepted Answer

Hyperkalemia

Answer

Hypokalemia

Answer

Hypercalcemia

Answer

Hyponatremia

Question 7

Before applying electrodes, why is it important to properly prepare the patient's skin?

Accepted Answer

To reduce impedance and improve signal quality

Answer

To speed up the heart rate

Answer

To reduce the paper speed needed

Answer

To increase the voltage output of the machine