#1
Which of the following is NOT a standard limb lead in a 12-lead ECG?
Lead I
Lead IV
Lead II
Lead III
#2
What is the purpose of placing electrodes for a 12-lead ECG?
To measure electrical activity of the heart from different angles
To measure blood pressure
To assess respiratory rate
To detect eye movements
#3
Which of the following is the standard placement for the right arm electrode in a 12-lead ECG?
Fourth intercostal space, right sternal border
Fourth intercostal space, left sternal border
Fifth intercostal space, right midclavicular line
Fifth intercostal space, left midclavicular line
#4
What does the P-wave represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#5
In a 12-lead ECG, where is the electrode placed for Lead aVR?
On the left leg
On the right arm
On the left arm
On the right leg
#6
Which of the following chest leads typically corresponds to the fifth intercostal space at the left midclavicular line?
Lead V1
Lead V2
Lead V3
Lead V4
#7
In which lead of a 12-lead ECG would you expect to see the most positive deflection for a typical QRS complex?
Lead I
Lead II
Lead III
Lead aVR
#8
Which lead serves as the 'ground' lead in a standard 12-lead ECG?
Lead I
Lead II
Lead III
Lead aVR
#9
What does the ST segment represent in an ECG?
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
Isoelectric period between ventricular depolarization and repolarization
#10
Which lead is considered reciprocal to Lead III in a 12-lead ECG?
Lead I
Lead II
Lead aVF
Lead aVL
#11
In the standard limb leads, which electrode placement serves as the reference point (zero potential)?
Left leg
Right arm
Left arm
Right leg
#12
Which lead is often used to monitor the inferior wall of the left ventricle?
Lead I
Lead II
Lead III
Lead aVF
#13
Which of the following is NOT typically measured directly from the ECG?
Heart rate
Blood pressure
QT interval duration
QRS complex duration
#14
In Lead V6 of a 12-lead ECG, where is the electrode typically placed?
Fifth intercostal space, right midaxillary line
Fifth intercostal space, left midaxillary line
Fifth intercostal space, right midclavicular line
Fifth intercostal space, left midclavicular line
#15
In Lead V3 of a 12-lead ECG, where is the electrode typically placed?
Between V2 and V4
At the fourth intercostal space, right sternal border
At the fifth intercostal space, right midaxillary line
At the fifth intercostal space, left midaxillary line