ECG Basics

How many leads are used in a standard 12-lead ECG?

• 10

• 8

• 15

• 12

3. What is the normal heart rate for an adult at rest?

• 60-100bpm

• 40-60bpm

• 100-120bpm

• 120-140bpm

5. Which is/are the cause(s) of artifacts on an ECG tracing?

• Improper lead placement

• Patient movement

• Loose electrodes

• All of the above

What does the P wave represent in an ECG waveform?

• Atrial depolarization

• Ventricular repolarization

• Atrial repolarization

• QRS complex

What does the QRS complex represent in an ECG waveform?

• AV node conduction

• Atrial repolarization

• Ventricular depolarization

• SA node activation

Where is the V1 lead placed during ECG recording?

• Fourth intercostal space just to the right of the sternum

• Fifth intercostal space just to the left of the sternum

• Sixth intercostal space just to the left of the sternum

• Second intercostal space just to the right of the sternum

Where is the V4 lead placed during ECG recording?

• Fourth intercostal space just to the right of the sternum

• Fifth intercostal space midclavicular line

• Sixth intercostal space just to the left of the sternum

• Second intercostal space just to the right of the sternum

1. Which of the following represents ventricular tachycardia on ECG?

• Heart rate >100 bpm, regular rhythm, wide QRS complex

• Heart rate >100 bpm, irregular rhythm, narrow QRS complex

• Heart rate >100 bpm, regular rhythm, narrow QRS complex

• Heart rate >100 bpm, irregular rhythm, wide QRS complex

Identify the following waveform.

• Atrial fibrillation

• Ventricular tachycardia

• Ventricular fibrillation

• Asystole

Identify the following waveform.

• Atrial fibrillation

• Ventricular tachycardia

• Ventricular fibrillation

• Asystole