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31 Cards in this Set
- Front
- Back
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T/F
A deficiency of K+ makes the Ht more easily stimulated and can cause palpitations |
True
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an xs of K+ can cause palpitations by making the HT more easily stimulated
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False
more difficult to stim HT -> cardiac arrest |
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What is the pacemaker of the HT?
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SA Node
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Which of the following is not considered conduction tissue of the HT?
a) SA node b) AV Node c) Bundle of His d) Purkinje Fibers |
SA Node - pace maker
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T/F
during the resting potential the charge outside the cell is negative |
F
outside + Inside - |
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what happens to the polarity of HT cells during depolarization
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change polarity
outside - inside + |
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following rapid depol what are the 4 phases of the cardiac AP
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inactivation of Na+
plateau repolarization activation of Na/K pump |
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Which is not a true statement
a) repol reestablishes the resting potential b) contraction is impossible to the absolute refractory period c) rapid depol occurs due to influx of K+ d) none of the above |
rapid depol occurs due to influx of NA+
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the absolute refractory period includes the following phases except
a) inactivation of Na+ channel b) plateau c) repolarization d) activation of Na/K pumps |
activation of Na/K
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the relative refractory period includes all of the following except
a) inactivation of Na+ channel b) plateau c) repolarization d) activation of Na/K pumps |
inactivation of Na+
Plateau |
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T/F
Cardiac contraction is not possible during the relative refractory period |
F
a stronger than normal stimulation can cause cardiac contraction |
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the P wave represents
a) SA node depol b) atrial depol c) ventricular depol d) a, b e) a, c |
SA node depol
atrial depol |
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the QRS wave represents
a) Atrial Depol b) Ventricular Depol c) AV Depol d) a, b e) b, c |
ventricular depol
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The T wave represents
a) Atrial depol b) Ventricular depol c) Atrial repol d) Ventricular repol |
ventricular repol
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The PQ wave represents
a) Atrial Depol b) Ventricular Depol c) AV Depol d) a, b e) b, c |
AV depol (also depol of bundle of his and purkinje fibers)
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Atrial is represented by
a) P wave b) QRS segment c) T wave d) none |
none
atrial repol is hidden by QRS- ventricular depol |
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premature contractions not stimulated by the SA node are caused by
a) reentry phenomenon b) conductivity impairment c) ectopic pacemaker d) none |
ectopic pacemaker
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how does K+ concentrations affect conductivity?
how does the Ca+ concentrations affect conductivity? |
lo K+ - hi conductivity
lo Ca+ - hi conductivity |
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what can contribute to conductivity and refracotriness impairment causing dysrhythmias
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electrolyte imbalance
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in a normal sinus rhythm the P wave occurs at
a) 0.12 sec b) 0.20 sec c) 0.32 sec d) none |
0.12 sec
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during a normal sinus rhythm the PR interval is
in a normal sinus rhythm the P wave occurs at a) 0.12 sec b) 0.20 sec c) 0.32 sec d) none |
0.20 sec
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list types of dysrhythmias
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respiratory sinus dysrhythmia
sinus bradycardia sinus tachycardia atrial dysrhythmia AV node dysrhythmia ventricular dysrhythmia |
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sinus bradycardia occurs heart rate is
______ sinus tachycardia is when the heart rate is __________ |
brady <60
tachy >100 |
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the following condition causes 2 P waves preceding the QRS wave
a) respiratory sinus dysrhythmia b) bundle block c) premature atrial contraction d) premature ventricular complex |
premature atrial contraction
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lack of a P wave indicates
a) respiratory sinus dysrhythmia b) bundle block c) premature atrial contraction d) premature ventricular complex |
premature ventricular complex (PVC)
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T/F
atrial fibrillation is life threatening |
F
ventricular fibrillation is life threatening |
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T/F
ventricular fibrillation is life threatening |
true- causes SV=0- EKG will show no pattern
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chaotic current flow within the atria causes
a) atrial flutter b) atrial fibrillation c) premature atrial contraction d) HT block |
atrial fibrillation
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blockage of the AV node can cause
a) ventricular fibrillation b) Ht Block c) Bundle Block d) a, b e) b, c |
HT Block
Bundle Block |
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1st degree HT block causes ____
3rd degree HT block causes____ |
1st >20s
3rd- complete block of ventricular stimulation |
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Ventricular tachycardia elicits beats that are _______
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100-250
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