ECG module 2

Question 1

What is the purpose of connecting the leads to the patient in ECG recording?
a) To complete the electrical circuit
b) To transmit data wirelessly
c) To charge the ECG machine
d) To ensure patient comfort

Answer 1

a) To complete the electrical circuit

Question 2

How many lead systems are there in a standard 12-lead ECG?
a) 6
b) 9
c) 12
d) 15

Answer 2

c) 12

Question 3

Which leads are referred to as bipolar or limb leads in ECG?
a) Leads I, II, and III
b) Leads aVR, aVL, and aVF
c) Leads V1-V6
d) Leads A and B

Answer 3

a) Leads I, II, and III

Question 4

In ECG interpretation, what is an equipolar deflection?
a) A wave deflection moving towards the viewer
b) A wave deflection moving away from the viewer
c) A wave deflection at a 90° angle relative to the viewer
d) A wave deflection with no significance

Answer 4

c) A wave deflection at a 90° angle relative to the viewer

Question 5

Which part of the ECG tracing represents the vector of all electrical activity during ventricular depolarization?
a) P-wave
b) T-wave
c) QRS complex
d) PR interval

Answer 5

c) QRS complex

Question 6

Which lead is best for evaluating rhythm abnormalities in an ECG?
a) Lead II
b) Lead aVR
c) Lead V1
d) Lead aVL

Answer 6

a) Lead II

Question 7

How can you determine the origin of a pacemaker based on the width of the QRS complex in an ECG?
a) Supraventricular origin if QRS < 120ms
b) Ventricular origin if QRS < 120ms
c) Supraventricular origin if QRS > 120ms
d) Ventricular origin if QRS > 120ms

Answer 7

a) Supraventricular origin if QRS < 120ms

Question 8

What does the height or depth of a wave (amplitude) indicate in an ECG?
a) The speed of electrical conduction
b) The size of the muscle mass through which the impulse is traveling
c) The presence of arrhythmias
d) The time interval between P and T waves

Answer 8

b) The size of the muscle mass through which the impulse is traveling