ECG Online Electrocardiogram 2

Question 1

How many electrodes are placed on the body to record a standard 12-lead ECG?

Accepted Answer

10

Answer

Ten electrodes (four limb and six chest) produce the 12 leads of a standard ECG.

Question 2

Which chest lead is placed at the fourth intercostal space to the right of the sternum?

Accepted Answer

V1

Answer

V1 sits at the fourth intercostal space just right of the sternum.

Question 3

What does the P wave on an ECG represent?

Accepted Answer

Atrial depolarization

Answer

The P wave reflects depolarization (contraction) of the atria.

Question 4

The standard paper speed for recording an ECG is:

Accepted Answer

25 mm/sec

Answer

ECG paper runs at a standard speed of 25 mm/sec.

Question 5

Which limb electrode is typically used as the ground (reference) electrode?

Accepted Answer

Right leg

Answer

The right leg electrode serves as the ground reference.

ECG (Electrocardiogram) Practice Test