#1
Which limb lead is commonly used as the reference or ground lead in a standard 12-lead ECG?
Lead II
ExplanationLead II serves as the ground reference in a standard 12-lead ECG.
#2
In a standard 12-lead ECG, which leads are bipolar limb leads?
Lead I, Lead II, Lead III
ExplanationLeads I, II, and III are the bipolar limb leads in a standard 12-lead ECG.
#3
Which electrode acts as the ground in the standard 12-lead ECG system?
Right Leg
ExplanationThe Right Leg electrode serves as the ground in the standard 12-lead ECG system.
#4
Which lead is commonly used to monitor electrical activity in the inferior wall of the heart?
Lead II
ExplanationLead II is commonly used to monitor electrical activity in the inferior wall of the heart.
#5
Which of the following represents the correct sequence of electrode placement for a standard 12-lead ECG?
Right Arm, Right Leg, Left Arm, Left Leg, Chest Leads
ExplanationThe correct sequence for electrode placement is Right Arm, Right Leg, Left Arm, Left Leg, followed by the Chest Leads.
#6
Which chest lead is positioned at the fifth intercostal space in the midclavicular line?
V4
ExplanationLead V4 is positioned at the fifth intercostal space in the midclavicular line.
#7
In a standard 12-lead ECG, which leads are considered precordial or chest leads?
Lead V1 - V6
ExplanationLeads V1 through V6 are considered precordial or chest leads in a standard 12-lead ECG.
#8
Which electrode serves as the positive electrode for Lead III in the standard 12-lead ECG system?
Left Leg
ExplanationThe Left Leg electrode serves as the positive electrode for Lead III in the standard 12-lead ECG system.
#9
What is the significance of Lead aVR in the standard 12-lead ECG?
It's an augmented limb lead that views the heart from the perspective of the right arm.
ExplanationLead aVR provides a view of the heart from the perspective of the right arm as an augmented limb lead.
#10
What does Lead aVF in a standard 12-lead ECG primarily represent?
Inferior wall of the heart
ExplanationLead aVF primarily represents the electrical activity of the inferior wall of the heart in a standard 12-lead ECG.
#11
Which electrode serves as the ground in the standard 12-lead ECG system?
Right Leg
ExplanationThe Right Leg electrode serves as the ground in the standard 12-lead ECG system.
#12
What does Lead aVR in a standard 12-lead ECG primarily represent?
High lateral wall of the left ventricle
ExplanationLead aVR primarily represents the electrical activity of the high lateral wall of the left ventricle in a standard 12-lead ECG.