#1
Which component of the ECG represents atrial depolarization?
P wave
ExplanationAtrial depolarization is represented by the P wave on an ECG.
#2
What does the QRS complex represent in an ECG?
Ventricular depolarization
ExplanationThe QRS complex represents ventricular depolarization in an ECG.
#3
Which interval on an ECG represents the time from the start of atrial depolarization to the start of ventricular depolarization?
PR interval
ExplanationThe PR interval represents the time from atrial depolarization to ventricular depolarization on an ECG.
#4
What does the T wave represent in an ECG?
Ventricular repolarization
ExplanationThe T wave represents ventricular repolarization in an ECG.
#5
Which lead placement is commonly used for the standard 12-lead ECG?
Chest (V1-V6)
ExplanationStandard 12-lead ECG commonly uses lead placements on the chest (V1-V6).
#6
What is the normal duration range for the PR interval on an ECG?
0.06-0.12 seconds
ExplanationThe normal duration range for the PR interval on an ECG is 0.06-0.12 seconds.
#7
Which ECG lead is typically used to assess the inferior wall of the heart?
Lead II
ExplanationLead II is typically used to assess the inferior wall of the heart on an ECG.
#8
What is the normal duration range for the QRS complex on an ECG?
0.06-0.12 seconds
ExplanationThe normal duration range for the QRS complex on an ECG is 0.06-0.12 seconds.
#9
What does a prolonged QT interval on an ECG indicate?
Increased risk of ventricular arrhythmias
ExplanationA prolonged QT interval indicates an increased risk of ventricular arrhythmias.
#10
Which wave or segment of an ECG is used to evaluate for myocardial ischemia or injury?
ST segment
ExplanationThe ST segment of an ECG is used to evaluate for myocardial ischemia or injury.
#11
What does an inverted T wave signify in an ECG?
Myocardial infarction
ExplanationAn inverted T wave in an ECG signifies myocardial infarction.
#12
Which arrhythmia is characterized by irregular, chaotic atrial activity and absence of distinct P waves on ECG?
Atrial fibrillation
ExplanationAtrial fibrillation is characterized by irregular, chaotic atrial activity and absence of distinct P waves on ECG.
#13
Which interval on an ECG represents the time from the end of ventricular depolarization to the beginning of ventricular repolarization?
QT interval
ExplanationThe QT interval represents the time from the end of ventricular depolarization to the beginning of ventricular repolarization on an ECG.
#14
What is the typical duration of the QT interval on an ECG?
0.2-0.4 seconds
ExplanationThe typical duration of the QT interval on an ECG is 0.2-0.4 seconds.