Deck 13: The Standard 12 ECG System

Question 1

What does the "a" represent in the unipolar limb leads?

A) augmentation
B) attenuation
C) alteration
D) abatement

Answer 1

A

Question 2

Of the precordial leads,which are considered to be the lateral leads?

A) V5 and V6
B) V1, V2, and V3
C) V4, V5, and V6
D) V3, V4, V5 and V6

Answer 2

A

Question 3

When electrical impulses travel away from the positive electrode,what would be recorded on the ECG tracing?

A) negative deflection
B) positive deflection
C) straight line
D) equiphasic deflection

Answer 3

A

Question 4

On ECG paper operating at standard speed,what is the duration of the large squares?

A) 0.2 seconds
B) 2 seconds
C) 0.04 sec
D) 0.4 sec

Question 5

What is the correct electrode placement for the modified chest lead?

A) positive electrode at V1, negative electrode on left arm or shoulder
B) positive electrode at V3, negative electrode on left arm or shoulder
C) positive electrode at V6, negative electrode on right shoulder or arm
D) positive electrode at V2, negative electrode on right shoulder or arm

Question 6

Which of the following are considered to be precordial leads?
I)Lead I,II,III
II)aVR,aVL,aVF
III)V1,V2,V3,V4,V5,V6

A) III only
B) I and II only
C) I only
D) I, II, and III

Question 7

Of the precordial leads,which are considered to be the anterior leads?

A) V1, V2, V3, and V4
B) V1, V2, and V3
C) V4, V5, and V6
D) V5 and V6

Question 8

What is the name of imaginary equilateral triangle formed by the axes of the limb leads?

A) Einthoven's
B) Entwhistle's
C) Eiserman's
D) Entemann's

Question 9

What is the term for two or more waveforms together on an ECG?

A) complex
B) interval
C) segment
D) deflection

Question 10

On an ECG tracing,what is an isoelectric line called?

A) segment
B) complex
C) waveform
D) interval

Question 11

Of the limb leads,which contributes the least amount of information for the 12 lead ECG interpretation?

A) aVR
B) aVF
C) aVL
D) Lead III

Question 12

Of the limb leads,which leads are considered to be the inferior leads?

A) Leads II, III, and aVF
B) Leads II, III, and aVR
C) Leads I, II, III and aVR
D) Leads I, II, III and aVF

Question 13

Which leads monitor the electrical activity in the frontal plane of the heart?
I)Limb leads
II)Precordial leads
III)Modified Chest Lead

A) I only
B) II only
C) I and III only
D) I and II only

Question 14

What waveform is recorded on an ECG tracing when an electrical impulse travels perpendicular to the lead axis?

A) equiphasic
B) positive
C) negative
D) sawtooth

Question 15

Which limb leads are considered to be the left lateral leads?

A) I and aVL
B) II and aVL
C) III and aVL
D) Leads I, II, and avL

Question 16

How many electrodes are used in a 12 lead ECG?

A) 10 electrodes
B) 12 electrodes
C) 6 electrodes
D) 16 electrodes

Question 17

What is the standard speed at which ECG systems run?

A) 25 mm/sec
B) 25 cm/sec
C) 2.5 mm/sec
D) 2.5 cm/sec

Question 18

When electrical impulses travel toward the positive electrode,what waveform would be recorded on the ECG tracing?

A) positive deflection
B) negative deflection
C) straight line
D) equiphasic deflection

Question 19

Which health care professionals commonly obtain the ECGs in many hopsitals across the USA?

A) CRTs and RRTs
B) MDs and DOs
C) MAs
D) MLTs

Question 20

Which limb leads are unipolar leads?

A) aVR, aVL, and aVF
B) I, II, and III
C) IV, V, and VI
D) I, II, and aVF

Question 21

Which portion of an ECG tracing represents atrial depolarization?

A) P wave
B) QRS complex
C) T wave
D) U wave

Question 22

What portion of the RR interval does the QT interval normal compose?

A) 40%
B) 20%
C) 30%
D) 60%

Question 23

Which portion of the ECG tracing represents ventricular depolarization?

A) QRS complex
B) PR interval
C) P wave
D) T wave

Question 24

What does a flat ST segment usually indicate?

A) ischemia
B) normal ECG tracing
C) disconnected electrode
D) hyperkalemia

Question 25

Which portion of the ECG tracing represents total ventricular activity?

A) QT interval
B) QRS complex
C) T wave
D) U wave

Question 26

Which portion of the ECG tracing represents the time between ventricular depolarization and repolarization?

A) ST segment
B) T wave
C) QRS complex
D) PR interval

Question 27

Which portion of the ECG tracing represents ventricular repolarization?

A) T wave
B) U wave
C) QRS complex
D) ST interval

Question 28

Which low voltage wave may become more prominent in the presence of electrolyte disturbances,heart disease,or certain medications?

A) U wave
B) Y wave
C) T wave
D) P wave

Question 29

In a healthy adult at rest,what is the normal duration of the PR Interval?

A) 0.12 - 0.20 sec
B) 0.04 - 0.08 sec
C) 0.08 - 0.12 sec
D) 0.20 - 0.26 sec