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Cardiac Dysrhythmias Exam 1 Questions with Solutions
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Cardiac Dysrhythmias Exam 1
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Cardiac Dysrhythmias Exam 1What is the difference between a Myocardial Infarction and Cardiac Arrest? - answerMI:
Heart is STILL pumping blood but the muscle is being damaged from decreased blood
flow
Cardiac Arrest: The heart STOPS pumping blood
What is "automaticity"? - answerAbility to generate own impulse (SA, AV, bundle,
bundle of His, and purkinje fibers)
What is "excitability"? - answerAbility of the myocardial tissue that allows it to be
depolarized by a stimulus
How is the level of excitability determined? - answerLength of time after depolarization
before the tissues can be restimulated
What is the refractory phase of an ECG? - answerRecovery period after stimulation
What causes a cardiac dysrhythmia? - answerResult from disorders of impulse
formation, impulse conductions, or both
- If the secondary pacemaker (AV node) fires off more rapidly than the normal
pacemaker (SA node)
What is the priority action when evaluating a dysrhythmia? - answerDETERMINE THE
CAUSE
- The cause determines the patient's treatment
What is the "Electrophysiologic study" test used for? - answerIdentifies the causes of
heart blocks, tachydysrhythmias, bradydysrhythmias, and syncope
How does the sympathetic and parasympathetic nervous systems control the heart? -
answerSympathetic: Fight or flight
- Epinephrine release
- Increased HR
- Increased RR
Parasympathetic: Rest and Digest
- Decreased HR
- Decreased RR
- Increased
, Where is the pacemaker of the heart? - answer- Right atria (SA Node)
What is the significance of the P wave of an EKG strip? - answerP Wave: Atrial
contraction
What is the significance of the QRS Complex of an EKG strip? - answerQRS Complex:
ventricular contraction
What is the significance of the T wave of an EKG strip? - answerT wave: ventricular
repolarization (ventricular rest)
What does a NSTEMI mean on an EKG strip? - answerAcute ischemic event
- Depression of the ST interval
What is a STEMI on an EKG? - answerMyocardial Infarction (heart attack)
- Elevation of the ST wave
What causes ST depression? - answerIschemia
How do you calculate heart rate on an EKG? - answerCount the number of QRS
complexes in 1 minute
- Count the number of R-R intervals in 6 seconds
- Multiply that value by 10
Why do we use Telemetry Monitoring? - answerContinuous monitoring of the patient's
cardiac condition
You are at the nurse's station and notice on the telemetry reading that your patient is in
asystole. What is the first thing that you should do? - answer- Immediately check on
your patient
(the patient could have simply taken off the leads)
What does a normal sinus rhythm look like on an EKG? - answer- HR appears to be 60
- 100 bpm
- Follows normal conduction pattern
What does a sinus bradycardia look like on an EKG? - answer- Normal sinus rhythm but
incredibly slow
What are some causes of bradycardia? - answer- Narcotic use
- Deficient fluid volume
- Athletic
- Beta blockers
- Calcium channel blockers
- Amiodarone
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