#1
Which of the following ECG waves represents ventricular depolarization?
P wave
QRS complex
T wave
U wave
#2
Which ECG lead placement provides a bipolar view of the heart's electrical activity?
Lead I
Lead II
Lead III
Lead aVR
#3
Which ECG lead placement typically provides a view of the heart's electrical activity from a lateral perspective?
Lead I
Lead II
Lead aVL
Lead aVR
#4
Which ECG lead placement is commonly used to monitor the lateral wall of the heart?
Lead I
Lead II
Lead aVL
Lead aVR
#5
Which ECG lead placement is commonly used to monitor the inferior wall of the heart?
Lead I
Lead II
Lead III
Lead aVR
#6
What does the PR interval represent in an ECG reading?
Ventricular repolarization time
Atrial depolarization time
Ventricular depolarization time
Atrial repolarization time
#7
Which of the following cardiac dysrhythmias is characterized by rapid, irregular atrial contractions?
Atrial fibrillation
Ventricular tachycardia
Atrial flutter
Supraventricular tachycardia
#8
What is the normal duration range for the QRS complex in an ECG reading?
Less than 0.06 seconds
0.06 to 0.10 seconds
0.10 to 0.20 seconds
Greater than 0.20 seconds
#9
Which cardiac dysrhythmia is characterized by a lack of electrical activity in the heart?
Ventricular fibrillation
Ventricular tachycardia
Asystole
Atrial flutter
#10
What does the T wave represent in an ECG reading?
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
Atrial depolarization
#11
Which of the following is a characteristic feature of Mobitz type II heart block?
Progressively lengthening PR intervals until a beat is dropped
Consistently prolonged PR interval
Sudden onset of complete heart block
Normal PR interval with occasional dropped beats
#12
Which of the following is a characteristic feature of sinus bradycardia?
Regular rhythm with a rate greater than 100 bpm
Regular rhythm with a rate less than 60 bpm
Irregular rhythm with a rate less than 60 bpm
Irregular rhythm with a rate greater than 100 bpm
#13
Which of the following is a characteristic feature of third-degree heart block (complete heart block)?
Regular rhythm with a fixed PR interval
Regular rhythm with variable PR intervals
Progressively lengthening PR intervals until a beat is dropped
No association between P waves and QRS complexes
#14
What does the QT interval represent in an ECG reading?
Time for ventricular depolarization and repolarization
Time for atrial depolarization
Time for atrial repolarization
Time for ventricular repolarization
#15
Which of the following is NOT a common cause of cardiac dysrhythmias?
Electrolyte imbalances
Hypoxia
Increased vagal tone
Physical activity
#16
What does the ST segment represent in an ECG reading?
Time for atrial depolarization
Time for ventricular depolarization
Time for ventricular repolarization
Time for atrial repolarization
#17
Which of the following factors can lead to a prolonged QT interval on an ECG?
Hypocalcemia
Hypokalemia
Hypomagnesemia
All of the above
#18
Which ECG lead placement is often used to monitor the inferior wall of the heart?
Lead I
Lead II
Lead III
Lead aVR
#19
Which of the following cardiac dysrhythmias is characterized by a regular rhythm with absent P waves and narrow QRS complexes?
Atrial fibrillation
Ventricular tachycardia
Atrial flutter
Supraventricular tachycardia
#20
Which ECG lead placement is often used to monitor the anterior wall of the heart?
Lead I
Lead II
Lead III
Lead aVR
#21
Which of the following cardiac dysrhythmias is characterized by a chaotic, irregular rhythm with no identifiable P waves and a chaotic baseline?
Atrial fibrillation
Ventricular tachycardia
Atrial flutter
Supraventricular tachycardia
#22
Which ECG lead placement is often used to monitor the lateral wall of the heart?
Lead I
Lead II
Lead aVL
Lead aVR
#23
Which of the following cardiac dysrhythmias is characterized by a rapid, regular rhythm originating above the ventricles but below the atria?
Atrial fibrillation
Ventricular tachycardia
Atrial flutter
Supraventricular tachycardia