Quiz
Depolarization, Cardiac Axis & EKG
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Questions in this quiz (37)
1Pacemaker cells in the SA node are located:
- Aat the junction between the vena cava and right atrium
- Bprimarily in the right atrium
- Cat the junction between the right atrium and the right ventricle
- Dnear the coronary sinus
2The 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.
- ATrue
- BFalse
3Which of the following is a result of atrial depolarization?
- AQRS complex
- BP wave
- CT wave
- DV wave
4The rate of depolarization slows down as the wave reaches the small AV node cells.
- ATrue
- BFalse
5The wave of depolarization after the AV node:
- Aspreads rapidly at a rate of 2-4 m/sec
- Bspreads rapidly at a rate of 3-5 m/sec
- Ctravels through the bundle of His and then to the bundle branches
- Dis slowed at the bundle of His
6The [blank_start]QRS complex[blank_end] seen in an EKG is due to depolarization of the ventricles.
- AQRS complex
- BP wave
- CPR interval
7Which of the following cells is/are capable of generating spontaneous pacemaker activity?
- AAV node
- BSA node
- CBundle cells
- DPurkinje fibers
8Without any neural modulation SA node cells would fire at a rate of 100-120 bpm.
- ATrue
- BFalse
9Atrial 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.
- ATrue
- BFalse
10Standard limb lead I compares voltage between:
- Aright arm and left leg
- Bright arm and left arm
- Cleft arm and left leg
11Standard limb lead II compares voltage between the right arm and left leg.
- ATrue
- BFalse
12Augmented 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.
- Aleft leg
- Bright leg
- C4th intercostal space
- Dleft arm
13Augmented lead _____ has negative leads averaged between the left arm and left leg, with the positive lead on the right arm.
- AaVR
- BAVL
- CaVF
14Augmented lead aVF averages negative leads on both feet and compares voltage to a positive lead on the left arm.
- ATrue
- BFalse
15Which of the following are components of standard limb lead III?
- Anegative lead on the left arm
- Bnegative lead on the right arm
- Cpositive lead on the left leg
- Dpositive lead on the right leg
16What abnormality is portrayed in the EKG tracing?
- A1st degree heart block
- B2nd degree heart block, Mobitz Type II
- CST elevation
- D2nd degree heart block, Mobitz Type I
17The portrayed EKG tracing demonstrates 2nd degree, Mobitz Type II heart block.
- ATrue
- BFalse
18This EKG tracing demonstrates 3rd degree heart block. Which of the following are characteristics of this abnormality?
- AComplete A-V disassociation (dissociated P waves)
- Bconsistent QRS complex
- C3rd degree burns
- DAbsent PR interval (atria & ventricles beat independently)
- EAbsent P waves
- FVentricular bradycardia
19What abnormality is demonstrated by the EKG tracing?
- AVentricular fibrillation
- BAtrial fibrillation
- CAuricular fibrillation
- DDefibrillation
20[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.
- AVentricular tachycardia
- B100
- CQRS
21This EKG tracing demonstrates sinus bradycardia.
- ATrue
- BFalse
22What abnormality is demonstrated here?
- AVentricular fibrillation
- BAtrial fibrillation
- CAtrial flutter
23The pictured abnormality demonstrates atrial flutter. How does this differ from atrial fibrillation?
- AElectrical activity is coordinated in flutter, but not in fibrillation
- BElectrical activity is coordinated in fibrillation, but not in flutter
- CCharacteristic "sawtooth" P waves are present
- DQRS is grossly abnormal.
24This EKG tracing demonstrates which of the following?
- ASinus bradycardia
- BSinus tachycardia
- CSinus arrhythmia
- DSinus pressure
25Which is the most common cause of sudden death?
- AAbetalipoproteinemia
- BVentricular fibrillation
- CPA students suddenly transitioning to a sedentary lifestyle and questionable dietary habits
- DDarth Proteus + a bottle of Don Julio 70
- EAtrial fibrillation
26Where does standard limb lead III record differences in potential?
- ALeft arm (-) and left leg (+)
- BRight arm (-) and left leg (+)
- CRight arm (+) and right leg (+)
27You'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?
- Apositive (upward) deflection forming the P wave
- Bnegative (downward) deflection forming the P wave
- Cformation of the QRS complex
- Dformation of the Z wave
28With respect to limb lead II, what do you expect to observe on an EKG upon the FIRST stage of ventricular depolarization?
- Aa slight positive deflection at the beginning of the QRS complex
- Ba slight negative deflection at the beginning of the QRS complex
- Cno measurable deflection
- Da large negative deflection at the beginning of the QRS complex
29With respect to aVR, you expect to see a negative (downward) deflection upon the SECOND stage of ventricular depolarization.
- ATrue
- BFalse
30All of the following are terms that describe abnormal pathways of depolarization in cardiac muscle except:
- Are-entry
- Bcircus movement
- Creciprocating tachycardia
- Dfibrillation
- Erefractory repolarization
31Regarding 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.
- ATrue
- BFalse
32If the QRS axis (vector) is negative in lead I and negative in lead aVF, then:
- AYou are in the NW axis (can be seen in patients with v-tach; relatively rare)
- BThis confirms a left axis deviation (LAD) usually seen with left ventricular hypertrophy or right ventricle damage
- CThis confirms a right axis deviation (RAD) usually seen with right ventricular hypertrophy or left ventricle damage
- DI need to watch the video provided in the explanation to understand more
33The normal QRS axis of the heart comprises a vector between +90 and -50 degrees
- ATrue
- BFalse
34A normal PR interval is between
- A0.12 and 0.2 sec
- B0.2 - 0.3 sec
- C0.06 - 0.1 sec
- D0.35 - 0.4 sec
35You 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:
- A1 second
- B0.2 seconds
- C0.5 mV
- D0.4 seconds
36The best immediate treatment for ventricular fibrillation would be blocking the
- AI (f) channel
- BTEA-type K channel
- CNa+ channel
- DNone of the above
37Which of the leads is depicted in this image?
- AaVL
- BLimb lead II
- CLimb lead III
- DPrecordial lead
Information
- Description
- Cardiovascular Physiology Lecture #2
- Author
- Trey W
- Language
- English
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- 160
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