Cardiac Rhythm Interpretation (NURS 4075 Exam #1) –
Questions With Fully Explained Solutions
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Practice questions for this set
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1. assess regularity
2. assess rate (atrial and ventricular)
3. Identify and examine waveform (P, Q, R, S, T)
4. Assess intervals (PR, QRS, QT) and examine ST segment for elevation or depression
5. Interpret the rhythm and assess its clinical significance
Choose an answer
1 What are the two types of cardiac cells? 2 Escape pacemakers
Electrical conduction- the path of action
3 System rhythm interpretation 4
potential from beginning to end:
Don't know?
Terms in this set (55)
What are the two types of cardiac cells? Myocardial contractile cells (working cells) and myocardial
conducting cells (pacemaker cells)
Myocardial contractile cells (working cells) actin and myosin filaments
contain ... and ...
Myocardial contractile cells give cardiac contractility
cells the property of ...
Myocardial conducting cells (pacemaker -Spontaneous generation and conduction of electrical
cells) impulses
-Gives cardiac cells the property of automaticity
, Electrical conduction- the path of action 1. SA node
potential from beginning to end: 2. Internodal fibers
3. AV node
4. Bundle of His
5. Bundle branches
6. Purkinje fibers
The AV junction consist of what two 1. AV node
structures? 2. Bundle of His
Where can action potential be generated? -Sinus rhythms come from the SA node (Primary/dominant)
- Junctional rhythms come from AV junction (reserve/escape)
-Ventricular rhythms come from the purkinje vibers
-Atrial rhythms come from the internodal pathways
Sinus rhythms -Come from the sinoatrial (SA) node
-Primary/dominant
-Normal pacemaker of the heart
-60-100 bmp
Junctional rhythms -Come from the AV junction (reserve/escape): AV node and
Bundle of His
-40-60 bmp
Ventricular rhythms -Come from purkinje fibers
-20-40 bpm
Atrial rhythms -Come from internodal pathways
-Internodal pathways can generate a fourth group of
dysrhythmias
-Fast and irritable rhythms
Primary pacemaker SA node
-These cells have an intrinsic rate of 60-100 bpm
Escape pacemakers -AV node and bundle of His - these cells have an intrinsic rate
of 40-60 bpm (should the SA node fail)
-Purkinje fibers - these cells have an intrinsic rate of 20-40
bpm (should hte SA node and AV bundle fail)
Why are the bundle branches important - They split the electrical impulse, which then travels down
both branches to depolarize both ventricles simultaneously
-Rhythms above ventricles:
Above ventricles = "supraventricular" (sinus, atrial, and
junctional) use this pathway
- Result: QRS complex is "narrow" (normal range: 0.11 sec or
less)
Purkinje fiber impulses do not use ... Bundle branches
Explain -An impulse originating in the purkinje fibers can't depolarize
the ventricles by going backward up bundle branches toward
the atria.
- Instead, the impulse must ravel cell to cell through the
myocardial muscle wall "the long way"
- Results: QRS complex is "Wide" (0.12 sec or longer)
Action potential in cardiac conducting cells Depolarization: rapid influx of Ca2+
Repolarization: outflux of K+
Questions With Fully Explained Solutions
Save
Students also studied
Chapter 29- Chest and Abdominal Tr... Chapter 21 Test Ch. 22 Study Guide
348 terms 24 terms 32 terms
anaphylacticshock Preview kenanderson2017 Preview Kendall_Dinning
Practice questions for this set
Learn 1 /7 Study using Learn
1. assess regularity
2. assess rate (atrial and ventricular)
3. Identify and examine waveform (P, Q, R, S, T)
4. Assess intervals (PR, QRS, QT) and examine ST segment for elevation or depression
5. Interpret the rhythm and assess its clinical significance
Choose an answer
1 What are the two types of cardiac cells? 2 Escape pacemakers
Electrical conduction- the path of action
3 System rhythm interpretation 4
potential from beginning to end:
Don't know?
Terms in this set (55)
What are the two types of cardiac cells? Myocardial contractile cells (working cells) and myocardial
conducting cells (pacemaker cells)
Myocardial contractile cells (working cells) actin and myosin filaments
contain ... and ...
Myocardial contractile cells give cardiac contractility
cells the property of ...
Myocardial conducting cells (pacemaker -Spontaneous generation and conduction of electrical
cells) impulses
-Gives cardiac cells the property of automaticity
, Electrical conduction- the path of action 1. SA node
potential from beginning to end: 2. Internodal fibers
3. AV node
4. Bundle of His
5. Bundle branches
6. Purkinje fibers
The AV junction consist of what two 1. AV node
structures? 2. Bundle of His
Where can action potential be generated? -Sinus rhythms come from the SA node (Primary/dominant)
- Junctional rhythms come from AV junction (reserve/escape)
-Ventricular rhythms come from the purkinje vibers
-Atrial rhythms come from the internodal pathways
Sinus rhythms -Come from the sinoatrial (SA) node
-Primary/dominant
-Normal pacemaker of the heart
-60-100 bmp
Junctional rhythms -Come from the AV junction (reserve/escape): AV node and
Bundle of His
-40-60 bmp
Ventricular rhythms -Come from purkinje fibers
-20-40 bpm
Atrial rhythms -Come from internodal pathways
-Internodal pathways can generate a fourth group of
dysrhythmias
-Fast and irritable rhythms
Primary pacemaker SA node
-These cells have an intrinsic rate of 60-100 bpm
Escape pacemakers -AV node and bundle of His - these cells have an intrinsic rate
of 40-60 bpm (should the SA node fail)
-Purkinje fibers - these cells have an intrinsic rate of 20-40
bpm (should hte SA node and AV bundle fail)
Why are the bundle branches important - They split the electrical impulse, which then travels down
both branches to depolarize both ventricles simultaneously
-Rhythms above ventricles:
Above ventricles = "supraventricular" (sinus, atrial, and
junctional) use this pathway
- Result: QRS complex is "narrow" (normal range: 0.11 sec or
less)
Purkinje fiber impulses do not use ... Bundle branches
Explain -An impulse originating in the purkinje fibers can't depolarize
the ventricles by going backward up bundle branches toward
the atria.
- Instead, the impulse must ravel cell to cell through the
myocardial muscle wall "the long way"
- Results: QRS complex is "Wide" (0.12 sec or longer)
Action potential in cardiac conducting cells Depolarization: rapid influx of Ca2+
Repolarization: outflux of K+
