ECG Electrode Functions and Placement

This video tutorial covers the basics of electrodes and leads used in ECG. It explains the function of electrodes, the setup of a 12-lead ECG, and the different types of leads including limb, augmented, and precordial leads. The video also discusses the voltage differences and vector representations of these leads, as well as the role of Wilson's central terminal in precordial leads. The tutorial provides detailed instructions on electrode placement and highlights the importance of understanding the electrical activity of the heart in both frontal and horizontal planes.

What is the primary function of electrodes in ECG?

• To assess muscle strength

• To monitor breathing rate

• To record electrical activity of the heart

• To measure blood pressure

How many electrodes are required for a standard 12-lead ECG?

• 8

• 10

• 12

• 14

Where is the RA electrode placed in a 12-lead ECG?

• Right arm

• Left leg

• Right leg

• Left arm

Which leads are categorized as limb leads?

• aVR, aVL, aVF

• None of the above

• V1-V6

• I, II, III

What is the positive pole for lead aVR?

• Left arm

• Right arm

• Right leg

• Left leg

Which lead vector is closest to the horizontal line?

• Lead aVF

• Lead III

• Lead I

• Lead II

What is the anatomical direction of lead aVF?

• Straight down

• Straight up

• 45 degrees

• Horizontal

What acts as the negative pole in precordial leads?

• Left leg

• Right arm

• Wilson’s central terminal

• Left arm

What is Wilson’s central terminal?

• The average of the limb potentials

• A combination of precordial leads

• A single electrode on the chest

• A virtual electrode on the back

Which plane do precordial leads describe the heart's electrical currents in?

• Sagittal plane

• Frontal plane

• Horizontal plane

• Vertical plane