Chapter 3-The Electrocardiograph

Question 1

Describe anatomically where lead V1 is located

Answer 1

Fourth intercostal space, right sternal border

Question 2

Describe anatomically where lead V2 is located

Answer 2

fourth intercostal space, left sternal border

Question 3

Describe anatomically where lead V3 is located

Answer 3

halfway between V2 and V4

Question 4

Describe anatomically where lead V4 is located

Answer 4

fifth intercostal space at the midclavicular line

Question 5

Describe anatomically where lead V5 is located

Answer 5

on the same horizontal level with V4, at the anterior axillary line

Question 6

Describe anatomically where lead V6 is located

Answer 6

on the same horizontal level with V4 and V5, at the midaxillary line

Question 7

Which leads are considered bipolar leads

Answer 7

Lead 1-3

Question 8

Define a bipolar lead

Answer 8

measures the flow of electrical current in both directions at the same time

Question 9

Define a unipolar lead

Answer 9

measures the flow of electrical current one direction only

Question 10

Which leads are considered unipolar

Answer 10

aVR, aVL, aVF, V1-V6

Question 11

Precordial lead also known as

Answer 11

V-Lead, pre (before) cor (heart) meaning placed in front of the heart

Question 12

Define Einthoven’s triangle

Answer 12

triangle formed by three of the limb electrodes, left arm/right arm/left leg. Used as reference for first six leads of the 12 lead ecg

Question 13

What is the standard ECG speed

Answer 13

25 millimeters per second

Question 14

What must be done when changing the ECG speed

Answer 14

must note on ECG that change was made and the specifics

Question 15

What is the standard gain for ECG

Answer 15

10mm/mV