Electrocardiography (ECG) Fundamentals Quiz

Test your understanding of electrocardiography with these questions on heart electrical activity, lead placements, and ECG interpretations.

#1

Which component of the heart initiates the electrical impulse for each heartbeat?

Atrioventricular node
Purkinje fibers
Sinoatrial node
Bundle of His
#2

What does the 'P' wave represent in an ECG?

Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#3

What does the 'QRS complex' represent in an ECG?

Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#4

Which of the following is a common artifact seen in ECG recordings caused by patient movement?

Sinus arrhythmia
60-cycle interference
Wandering baseline
P wave inversion
#5

Which wave represents ventricular repolarization in an ECG?

P wave
Q wave
R wave
T wave
#6

Which lead placement is commonly used to monitor the heart's electrical activity from a frontal plane view?

Lead I
Lead II
Lead III
Lead aVR
#7

What is the standard paper speed used in most ECG machines for recording?

25 mm/s
50 mm/s
75 mm/s
100 mm/s
#8

What does the term 'ST segment elevation' indicate in an ECG?

Myocardial infarction
Hypokalemia
Sinus tachycardia
Atrial fibrillation
#9

Which electrolyte imbalance is commonly associated with a prolonged QT interval on an ECG?

Hyperkalemia
Hypokalemia
Hypercalcemia
Hyponatremia
#10

Which lead placement is used to view the heart's electrical activity from an inferior perspective?

Lead I
Lead II
Lead III
Lead aVF
#11

In which ECG lead would you typically see the tallest R wave in a healthy heart?

Lead I
Lead II
Lead III
Lead aVL
#12

What is the standard placement for the V1 electrode in a 12-lead ECG?

Fourth intercostal space, right sternal border
Fourth intercostal space, left midclavicular line
Fifth intercostal space, midaxillary line
Fifth intercostal space, left midclavicular line
#13

What is the approximate duration of a normal PR interval on an ECG?

0.04-0.10 seconds
0.10-0.20 seconds
0.20-0.40 seconds
0.40-0.60 seconds
#14

Which ECG lead placement provides a view of the heart's electrical activity from the right shoulder to the left leg?

Lead I
Lead II
Lead III
Lead aVR
#15

Which lead placement in a 12-lead ECG is used to monitor the electrical activity of the septal wall of the left ventricle?

Lead I
Lead II
Lead III
Lead aVL

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