NUR 313 Cardiac Dysrhythmias Review Questions and Correct Answers
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Course
NUR 313
Institution
NUR 313
Which telemetry electrodes are preferred for arrhythmia monitoring? Lead II, VI and V6
What is an artifact with telemetry monitoring and what causes one? -distortion of the baseline that makes interpretation difficult -can be due to muscle activity or electrical interference
7 steps to ECG interp...
NUR 313 Cardiac Dysrhythmias Review
Questions and Correct Answers
Which telemetry electrodes are preferred for arrhythmia monitoring? ✅Lead II, VI and
V6
What is an artifact with telemetry monitoring and what causes one? ✅-distortion of the
baseline that makes interpretation difficult
-can be due to muscle activity or electrical interference
7 steps to ECG interpretation ✅-is rate fast, slow, or normal
-is rhythm regular (equal distance from P to P) (equal distance from QRS to QRS)
-are there P waves present
-are there QRS complexes present
-are the intervals within normal limits
-is there a P wave for every QRS
-is there a QRS for every P wave
how to calculate the rate ✅count the number of QRS complexes in 6 seconds and
multiply by 10
normal rate ✅60-100 bpm
What are dysrhythmias what what causes them? ✅-abnormal cardiac rhythms
-disorders of impulse formation
-disorders of conduction of impulses
-both
What is the normal pacemaker of the heart? ✅SA node (60-100 bpm)
What are the secondary pacemakers? ✅-AV node (40-60 bpm)
-His-Purkinje fibers (20-40 bpm)
Order of interventions with dysrhythmias (7) ✅1. ensure ABCs
2. administer O2
3. obtain baseline VS and O2 sat
4. obtain 12-lead EKG
5. hookup to telemetry
6. identify underlying rate and rhythm (dysrhythmia)
7. establish IV line
EKG: normal sinus rhythm (NSR) ✅--> this is the benchmark of all rhythms.
, - there is a P wave before every QRS.
- the p waves are upright & small, rounded waves.
-the QRS is tall and narrow
- the rhythm is regular.
- the atrial & ventricular rate are the same (60-100 beats per minute).
- the PR interval is 0.12 - 0.20 seconds.
- the QRS is 0.04 - 0.12 seconds.
EKG: sinus bradycardia ✅regular sinus rhythm that has the same characteristics as
NSR, except rate is less than 60
Causes of sinus bradycardia & when it is normal ✅-normal in aerobically trained
athletes and during sleep
- carotid sinus massage and valsalva maneuver
-vagal stimulation
-hypothermia
-administration of certain drugs (beta-blockers)
-hypoxia
S&S of sinus bradycardia ✅-hypotension
-pale, cool skin
-weakness
-angina
-dizziness or syncope
-confusion or disorientation
-shortness of breath
Treatment for sinus bradycardia ✅-atropine 0.5 mg IV push
-if it is because of drugs, may need to stop or lower dose
-pacemaker may be required
What are pacemakers? ✅electronic devices that pace the heart when the normal
conduction pathway is damaged or diseased
Permanent pacemaker ✅-power source planted subcutaneously, usually over the
pectoral muscle on the patient's non-dominant side
-pacer leads threaded transvenously to the right atrium and one or both ventricles, and
attached to power source
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