Copy and Edit

Depolarization, Cardiac Axis & EKG

Description

Cardiovascular Physiology Lecture #2
Trey W
Quiz by Trey W, updated more than 1 year ago
Trey W
Created by Trey W almost 4 years ago
134
0
0

Resource summary

Question 1

Question
Pacemaker cells in the SA node are located:
Answer
  • at the junction between the vena cava and right atrium
  • primarily in the right atrium
  • at the junction between the right atrium and the right ventricle
  • near the coronary sinus

Question 2

Question
The wave of depolarization in the heart moves from the SA node to the RA, interatrial septum and left atrium at a rate of 0.4 m/sec.
Answer
  • True
  • False

Question 3

Question
Which of the following is a result of atrial depolarization?
Answer
  • QRS complex
  • P wave
  • T wave
  • V wave

Question 4

Question
The rate of depolarization slows down as the wave reaches the small AV node cells.
Answer
  • True
  • False

Question 5

Question
The wave of depolarization after the AV node:
Answer
  • spreads rapidly at a rate of 2-4 m/sec
  • spreads rapidly at a rate of 3-5 m/sec
  • travels through the bundle of His and then to the bundle branches
  • is slowed at the bundle of His

Question 6

Question
The [blank_start]QRS complex[blank_end] seen in an EKG is due to depolarization of the ventricles.
Answer
  • QRS complex
  • P wave
  • PR interval

Question 7

Question
Which of the following cells is/are capable of generating spontaneous pacemaker activity?
Answer
  • AV node
  • SA node
  • Bundle cells
  • Purkinje fibers

Question 8

Question
Without any neural modulation SA node cells would fire at a rate of 100-120 bpm.
Answer
  • True
  • False

Question 9

Question
Atrial fibrillation occurs when the atrial muscle depolarizes so frequently (rates up to 500/min) that the atrial contraction is ineffective and the QRS complex is replaced by small oscillations.
Answer
  • True
  • False

Question 10

Question
Standard limb lead I compares voltage between:
Answer
  • right arm and left leg
  • right arm and left arm
  • left arm and left leg

Question 11

Question
Standard limb lead II compares voltage between the right arm and left leg.
Answer
  • True
  • False

Question 12

Question
Augmented lead aVL averages negative leads on the right arm and [blank_start]left leg[blank_end] to compare to a positive lead on the left arm.
Answer
  • left leg
  • right leg
  • 4th intercostal space
  • left arm

Question 13

Question
Augmented lead _____ has negative leads averaged between the left arm and left leg, with the positive lead on the right arm.
Answer
  • aVR
  • AVL
  • aVF

Question 14

Question
Augmented lead aVF averages negative leads on both feet and compares voltage to a positive lead on the left arm.
Answer
  • True
  • False

Question 15

Question
Which of the following are components of standard limb lead III?
Answer
  • negative lead on the left arm
  • negative lead on the right arm
  • positive lead on the left leg
  • positive lead on the right leg

Question 16

Question
What abnormality is portrayed in the EKG tracing?
Image:
Screen+Shot+2020 06 25+At+10.28.23+Pm (binary/octet-stream)
Answer
  • 1st degree heart block
  • 2nd degree heart block, Mobitz Type II
  • ST elevation
  • 2nd degree heart block, Mobitz Type I

Question 17

Question
The portrayed EKG tracing demonstrates 2nd degree, Mobitz Type II heart block.
Image:
Screen+Shot+2020 06 23+At+4.55.20+Pm (binary/octet-stream)
Answer
  • True
  • False

Question 18

Question
This EKG tracing demonstrates 3rd degree heart block. Which of the following are characteristics of this abnormality?
Image:
Screen+Shot+2020 06 23+At+5.05.51+Pm (binary/octet-stream)
Answer
  • Complete A-V disassociation (dissociated P waves)
  • consistent QRS complex
  • 3rd degree burns
  • Absent PR interval (atria & ventricles beat independently)
  • Absent P waves
  • Ventricular bradycardia

Question 19

Question
What abnormality is demonstrated by the EKG tracing?
Image:
Screen+Shot+2020 06 23+At+5.12.01+Pm (binary/octet-stream)
Answer
  • Ventricular fibrillation
  • Atrial fibrillation
  • Auricular fibrillation
  • Defibrillation

Question 20

Question
[blank_start]Ventricular tachycardia[blank_end] (as shown in this tracing) is characterized by a heart rate greater than [blank_start]100[blank_end] bpm and wide [blank_start]QRS[blank_end] interval.
Image:
Screen+Shot+2020 06 23+At+5.15.58+Pm (binary/octet-stream)
Answer
  • Ventricular tachycardia
  • 100
  • QRS

Question 21

Question
This EKG tracing demonstrates sinus bradycardia.
Image:
Screen+Shot+2020 06 23+At+5.21.40+Pm (binary/octet-stream)
Answer
  • True
  • False

Question 22

Question
What abnormality is demonstrated here?
Image:
Screen+Shot+2020 06 23+At+5.31.48+Pm (binary/octet-stream)
Answer
  • Ventricular fibrillation
  • Atrial fibrillation
  • Atrial flutter

Question 23

Question
The pictured abnormality demonstrates atrial flutter. How does this differ from atrial fibrillation?
Image:
Screen+Shot+2020 06 23+At+5.34.22+Pm (binary/octet-stream)
Answer
  • Electrical activity is coordinated in flutter, but not in fibrillation
  • Electrical activity is coordinated in fibrillation, but not in flutter
  • Characteristic "sawtooth" P waves are present
  • QRS is grossly abnormal.

Question 24

Question
This EKG tracing demonstrates which of the following?
Image:
Screen+Shot+2020 06 23+At+5.42.29+Pm (binary/octet-stream)
Answer
  • Sinus bradycardia
  • Sinus tachycardia
  • Sinus arrhythmia
  • Sinus pressure

Question 25

Question
Which is the most common cause of sudden death?
Answer
  • Abetalipoproteinemia
  • Ventricular fibrillation
  • PA students suddenly transitioning to a sedentary lifestyle and questionable dietary habits
  • Darth Proteus + a bottle of Don Julio 70
  • Atrial fibrillation

Question 26

Question
Where does standard limb lead III record differences in potential?
Answer
  • Left arm (-) and left leg (+)
  • Right arm (-) and left leg (+)
  • Right arm (+) and right leg (+)

Question 27

Question
You're performing an EKG on a patient and focusing on limb lead II. In terms of deflection, what do you expect to see on the tracing upon atrial depolarization?
Answer
  • positive (upward) deflection forming the P wave
  • negative (downward) deflection forming the P wave
  • formation of the QRS complex
  • formation of the Z wave

Question 28

Question
With respect to limb lead II, what do you expect to observe on an EKG upon the FIRST stage of ventricular depolarization?
Answer
  • a slight positive deflection at the beginning of the QRS complex
  • a slight negative deflection at the beginning of the QRS complex
  • no measurable deflection
  • a large negative deflection at the beginning of the QRS complex

Question 29

Question
With respect to aVR, you expect to see a negative (downward) deflection upon the SECOND stage of ventricular depolarization.
Answer
  • True
  • False

Question 30

Question
All of the following are terms that describe abnormal pathways of depolarization in cardiac muscle except:
Answer
  • re-entry
  • circus movement
  • reciprocating tachycardia
  • fibrillation
  • refractory repolarization

Question 31

Question
Regarding the QRS axis of the heart, if the QRS is positive (upright) in lead I and positive (upright) in lead aVF, then you have a normal axis.
Answer
  • True
  • False

Question 32

Question
If the QRS axis (vector) is negative in lead I and negative in lead aVF, then:
Answer
  • You are in the NW axis (can be seen in patients with v-tach; relatively rare)
  • This confirms a left axis deviation (LAD) usually seen with left ventricular hypertrophy or right ventricle damage
  • This confirms a right axis deviation (RAD) usually seen with right ventricular hypertrophy or left ventricle damage
  • I need to watch the video provided in the explanation to understand more

Question 33

Question
The normal QRS axis of the heart comprises a vector between +90 and -50 degrees
Answer
  • True
  • False

Question 34

Question
A normal PR interval is between
Answer
  • 0.12 and 0.2 sec
  • 0.2 - 0.3 sec
  • 0.06 - 0.1 sec
  • 0.35 - 0.4 sec

Question 35

Question
You are a 2nd year student and your internal medicine preceptor asks you the following question regarding an EKG trace: "How many seconds are represented by 1 big box?". Your answer is:
Answer
  • 1 second
  • 0.2 seconds
  • 0.5 mV
  • 0.4 seconds

Question 36

Question
The best immediate treatment for ventricular fibrillation would be blocking the
Answer
  • I (f) channel
  • TEA-type K channel
  • Na+ channel
  • None of the above

Question 37

Question
Which of the leads is depicted in this image?
Image:
Ekg (binary/octet-stream)
Answer
  • aVL
  • Limb lead II
  • Limb lead III
  • Precordial lead
Show full summary Hide full summary

Want to create your own Quizzes for free with GoConqr? Learn more.

Similar

Epithelial tissue
Morgan Morgan
Epidemiology
Danielle Richardson
History of Medicine: Ancient Ideas
James McConnell
4. The Skeletal System - bones of the skull
t.whittingham
Laboratory Tools
Christopher Nikolo R. Magtoto
Neuro anatomy
James Murdoch
Renal System A&P
Kirsty Jayne Buckley
The Endocrine System
DrABC
Respiratory anatomy
James Murdoch
Medical Terminology
khachoe_pema
Diabetes - pathophysiology
Morgan Morgan
Browse Library