- Myocardial cells posses the unique property of
Your answer:
depolarization
automaticity
contractility
repolarization
- Which of the following is NOT one of the three specialized types of myocardial cells?
Your answer:
pacemaker
depolarizing
working
conduction
- What is the purpose of pacemaker cells?
Your answer:
to depolarize at regular intervals
to contract when a wave of depolarization reaches them
to repolarize contracted muscle tissue
to delay the conduction from the atria to the ventricles
- The main pacemaker of the healthy heart is the
Your answer:
atrium
AV node
ventricle
SA node
- The AV node depolarizes spontaneously at what rate?
Your answer:
less than 40 times per minute
greater than 100 times per minute
40-60 times per minute
60-100 times per minute
- The cells responsible for mechanical contraction of the heart are
Your answer:
pacemaker cells
conduction cells
myocardial working cells
all the heart cells
- What mechanical event corresponds to the QRS complex in the normal heart?
Your answer:
the delay between atrial and ventricular contraction
reentry
atrial contraction
ventricular contraction
- A variance of greater than .04 second in the R-R interval is called
Your answer:
automaticity
dysrhythmia
irregularity
ectopy
- Which of the following is a cause of wide QRS complexes?
Your answer:
bundle branch block
hypernatremia
acute myocardial infarction
hypothermia
- What do we know for sure about a narrow QRS complex?
Your answer:
it must have followed the internodal pathways
it cannot have been generated by the SA node
the impulse was delayed at the AV node
it must have originated above the ventricles
- What is the maximum normal P-R interval?
Your answer:
.50 seconds
.12 seconds
.04 seconds
.20 seconds
- What dysrhythmia is IRREGULARLY irregular?
Your answer:
thrid degree heart block
sinus rhythm with PVCs
artial fibrillation
second degree, Type I heart block
- Which of the following is NOT a reentry dysrhythmia?
Your answer:
supraventricular tachycardia
artial fibrillation
atrial flutter
ventricular tachycardia
- All PVCs are________, but not all PACs and PJCs are____________.
Your answer:
wide, wide
wide, narrow
narrow, wide
narrow, narrow
- Most PVCs have a __________, and most PACs have a __________.
Your answer:
compensatory,compensatory
non-compensatory, non-compensatory
compensatory, non-compensatory
non-compensatory, compensatory
- Defibrillation is used to manage
Your answer:
asystolic dyrshythmia
chronic atrial fibrillation
ventricular fibrillation
life-threatening bradydysrhythmias
- Which of the following scenarios will most likely result in immediately successful cardioversion?
Your answer:
applying the electrical therapy 25 minutes after onset of symptoms
timing the cardioversion with the end-expiration phase of ventilations
ardioverting after epinephrine and/or other drugs have been administered
utilizing synchronous cardioversion for a patient in VF
- Which of the following statements about asynchronous cardioversion is true?
Your answer:
it is also known as defibrillation
it does not require the use of gel pds or electrode paste
if is never used in pediatric patients
it is the preferred method to terminate symptomatic tachydysrhythmias
- Defbrillating an asystolic heart may
Your answer:
be performed only after assuring the heart is in asystole in two leads
initiate spontaneous rhythms
make the heart more susceptible to the effects of the IV drugs
inhibit the natural pacemakers of the heart
- Which of the following energy dose regimes is correct for defibrillation?
Your answer:
200 joules, 200-300 joules, 360 joules
50-100 joules, 200 joules, 300 joules, 360 joules
50-100 joules, 200 joules, 360 joules
100 joules, 200 joules, 300 joules, 360 joules
- AEDs are used for
Your answer:
cardiac arrest victims in VF
cardiac arrest victims in asystole
cardiac arrest victims over 1 hour away from the hospital
cardiac arrest victims suffering from severe trauma only
- The difference between the countershocks delivered by the AED and those administered manually is:
Your answer:
The AED is not as effective as manual defibrillation
The AED uses lower energy levels than manual defibrillators
The AED repeatedly delivers "stacked shocks" of three, whereas manually they are delivered only one at a time.
The AED uses higher energy levels than manual defibrillators
- Synchronized cardioversion delivers the countershock
Your answer:
immediately upon depressing the discharge buttons of the paddles
during the R wave of the cardiac cycle
during expiration
during the T wave of the cardiac cycle
- The greatest benefit of using synchronous versus asynchronous countershocks for an unstable patient is supraventricular tachycardia is
Your answer:
lowest possible chance for causing VF
faster delivery of energy
lower risk of damage to the myocardium
a and c are correct
- Which of the following findings would indicate a hemodynamically unstable patient in ventricular tachycardia with a pulse?
Your answer:
cyanosis
mild respiratory distress
extreme diaphoresis
chest pain
- You have just delivered a synchronous cardioversion at 300 joules, and the patient goes into VF. you should immediately
Your answer:
intubate the trachea
defibrillate at 200 joules
administer epinephrine
resume CPR
- External cardiac pacing is the preferred treatment for
Your answer:
ventricular fibrillation
asystole
bradycardia
tachycardia
- How do you confirm that the external pacemaker is "capturing"?
Your answer:
Assess for a QRS complex after the pacer spike
Palpable pulse in conjunction with the pacemaker
The presence of a blood pressure
a and b are correct
- In cardiac arrest, which of the following would be the preferred site for peripheral IV cannulation?
Your answer:
saphenous vein
dorsum of the hand
antecubital fossa
subclavian vein
- Which of the following types of catheters is most commonly used for peripheral venous cannulation?
Your answer:
intraosseous catheter
hollow needle
catheter through the needle
catheter over the needle