#1
What does the P wave represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#2
Which segment of the ECG represents ventricular depolarization?
P wave
PR interval
QRS complex
ST segment
#3
What is the normal heart rate range for an adult at rest?
50-70 beats per minute
60-100 beats per minute
70-120 beats per minute
80-140 beats per minute
#4
Which wave in the ECG represents ventricular repolarization?
P wave
QRS complex
T wave
ST segment
#5
Which lead placement is typically used to record a standard 12-lead ECG?
V1 to V6
Lead I, II, and III
Lead aVR, aVL, and aVF
Lead I, II, III, aVR, aVL, and aVF
#6
What is the normal duration of the PR interval in milliseconds?
Less than 0.12 seconds
0.12 to 0.20 seconds
0.20 to 0.40 seconds
More than 0.40 seconds
#7
Which of the following arrhythmias is characterized by chaotic, irregular atrial activity on ECG?
Atrial fibrillation
Atrial flutter
Ventricular tachycardia
Ventricular fibrillation
#8
Which ECG lead is typically used to diagnose an inferior myocardial infarction?
Lead I
Lead II
Lead III
Lead aVF
#9
Which electrolyte imbalance is associated with a prolonged QT interval on ECG?
Hypokalemia
Hyperkalemia
Hypocalcemia
Hypercalcemia
#10
What does a prolonged PR interval suggest on an ECG?
Ventricular hypertrophy
First-degree heart block
Ventricular tachycardia
Atrial fibrillation
#11
What does a 'sawtooth' pattern of flutter waves typically indicate on an ECG?
Atrial flutter
Ventricular tachycardia
Atrial fibrillation
Normal sinus rhythm
#12
What is the characteristic appearance of a QRS complex in a ventricular premature contraction (PVC)?
Narrow and tall
Broad and bizarre
Absent
Inverted
#13
What is the most common cause of peaked T waves on an ECG?
Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
#14
What is the characteristic ECG finding in ventricular fibrillation?
Regular rhythm with absent P waves
Regular rhythm with absent QRS complexes
Chaotic rhythm with no discernible waves
Regular rhythm with narrow QRS complexes
#15
What is the most common cause of a widened QRS complex on ECG?
Ventricular tachycardia
Atrial fibrillation
Ventricular fibrillation
Bundle branch block
#16
Which arrhythmia is characterized by a regular rhythm with a wide QRS complex and absence of P waves?
Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
Atrial flutter