CCT ECG Fundamentals and Leads 2

Question 1

In a standard 12-lead ECG, lead aVR views the heart from which angle?

Accepted Answer

Right shoulder, looking toward the heart's base from above-right

Answer

Left shoulder, looking toward the lateral wall

Answer

Left foot, looking toward the inferior wall

Answer

Anterior chest, looking at the anterior wall

Question 2

Which leads make up the inferior leads on a standard 12-lead ECG?

Accepted Answer

II, III, and aVF

Answer

I, aVL, and V5-V6

Answer

V1-V4

Answer

aVR, aVL, and aVF

Question 3

A properly performed 12-lead ECG should be recorded at what standard paper speed?

Accepted Answer

25 mm/second

Answer

10 mm/second

Answer

50 mm/second

Answer

100 mm/second

Question 4

What does the standard calibration signal on an ECG represent, and what should its amplitude be?

Accepted Answer

1 mV electrical signal that should deflect the stylus exactly 10 mm (2 large squares) upward

Answer

0.5 mV signal deflecting 5 mm upward

Answer

2 mV signal deflecting 20 mm upward

Answer

1 mV signal deflecting 5 mm upward

Question 5

In Einthoven's triangle, which statement correctly describes the relationship between leads I, II, and III?

Accepted Answer

Lead II = Lead I + Lead III (Einthoven's Law)

Answer

Lead I = Lead II + Lead III

Answer

Lead III = Lead I + Lead II

Answer

All three leads are independent with no mathematical relationship

Question 6

Which precordial lead is typically located at the 4th intercostal space, right sternal border?

Accepted Answer

V1

Answer

V2

Answer

V3

Answer

V4