#1
In lead II of a standard ECG, the positive electrode is placed on which part of the body?
Right arm
Left leg
Left arm
Right leg
#2
In lead aVR, the positive electrode is placed on which part of the body?
Right arm
Left arm
Right leg
Left leg
#3
What is the primary purpose of the ECG electrode gel?
Enhance electrical conductivity
Provide insulation
Improve patient comfort
Prevent skin irritation
#4
In lead III of a standard ECG, the positive electrode is placed on which part of the body?
Right arm
Left arm
Left leg
Right leg
#5
Which limb leads are included in the standard 12-lead ECG?
I, II, III
aVR, aVL, aVF
V1 to V6
All of the above
#6
What is the significance of the P wave in an ECG?
Represents atrial depolarization
Indicates ventricular repolarization
Marks the onset of ventricular contraction
Reflects atrial repolarization
#7
Which precordial lead is commonly used to assess the anterior wall of the heart?
#8
Which lead is used to evaluate the lateral wall of the heart in a standard 12-lead ECG?
#9
Which lead provides a view of the inferior wall of the heart in a standard 12-lead ECG?
#10
Which lead is commonly used to assess the lateral wall of the left ventricle?
#11
What does the QRS complex represent in an ECG tracing?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#12
What is the normal duration of the PR interval in an ECG?
0.06 - 0.10 seconds
0.12 - 0.20 seconds
0.40 - 0.60 seconds
0.80 - 1.00 seconds
#13
In an ECG, what does the term 'ST segment' represent?
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
Isoelectric period between ventricular depolarization and repolarization
#14
What does the T wave represent in an ECG tracing?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#15
What is the primary function of the AV node in the cardiac conduction system?
Initiate the heartbeat
Conduct electrical impulses from atria to ventricles
Coordinate atrial and ventricular contractions
Generate the P wave on the ECG
#16
What does the term 'QT interval' represent in an ECG?
Time from the start of the P wave to the start of the QRS complex
Duration of ventricular depolarization
Time from the start of the QRS complex to the end of the T wave
Duration of atrial repolarization