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NUR 265 Unit 2 and Unit 3 questions fully solved & updated .
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  • NUR 265

What does each square of an ECG represent? 0.20 seconds. inside the box is smaller boxes that are 0.04 seconds of time. P wave first electrical signal saw. the atria is squeezing after receiving a signal from the SA node. The atrial kick is 20-30% of cardiac output. Loss of atrial kick wi...

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  • September 15, 2024
  • 33
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • NUR 265
  • NUR 265

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NUR 265 Unit 2 and Unit 3
questions fully solved &
updated 2024-2025.
What does each square of an ECG represent? - answer 0.20 seconds.
inside the box is smaller boxes that are 0.04 seconds of time.


P wave - answer first electrical signal saw. the atria is squeezing
after receiving a signal from the SA node.
The atrial kick is 20-30% of cardiac output. Loss of atrial kick will
affect bp and pump performance


PR Interval - answer SA (atrial) node drops the signal. The AV valves
are shut causing the node to drop the signal.
It measures from the onset of the p wave to the start of the
ventricular activity (the QRS)


Normal for the adult is 0.12-0.20 seconds.


QRS complex - answer Ventricular depolarization. There are 3 waves
shown that represent the electrical signal through the ventricle and
will depend on the lead.


Normal adult is 0.04-0.12 seconds.
If it is greater that 0.12 seconds there is a conduction delay (BBB)
bundle branch block.


ST segment - answer Suppose to be electrically neutral when normal
(at baseline)

,If it is below baseline it is a sign of cardiac ischemia (reversible)
also known as a NSTEMI


If elevated, there has been cardiac death. The cells have died (sign
of myocardial infarction.) STEMI


T wave - answer Ventricular rest or replarization


Tall tented t means elevated potassium


Flattened means low potassium


QR interval - answer Start of ventricular work to the end of
ventricular rest.


The normal is 0.37-0.42 seconds or less than half of the preceding R
to R interval


Prolonged intervals mean an extra signal can jump in and create
arrhythmias


Sinus rhythms (normal) - answer Rate of 60-100
Rhythm will be regular
One p wave for every QRS complex
PR interval (0.12-0.20 seconds)
QRS normal (0.04-0.12) unless patient has an underlying conduction
delay


Sinus Brady - answer Slow heart rate of less than 60 beats/min

,Rhythm is regular
P wave will be a 1:1 relationship and all p waves will look alike
PRI is normal (0.12-0.20 seconds)
QRS is normal (0.04-0.12 seconds) unless patient has an underlying
BBB


Nursing interventions for sinus Brady - answer First- check the
patient
Second- look for reasons (such as electrolytes, hypoxia, drugs, vagal
maneuvers, sleeping, and this is normal for athletes)


Sinus Brady: signs and symptoms - answer Syncope
Dizziness and weakness
Confusion
Diaphoresis
Shortness of breath
Chest pain


Sinus Brady: treatment - answer Temporary pace (transcutaneous
pacing)
Permanent pacer
Find the underlying cause (drugs)
Atropine


Sinus Tachycardia - answer Fast heart rate over 100 bpm
The rhythm is regular
There is one P wave for every QRS complex
PRI is normal (0.12-0.20)
QRS is normal (0.04-0.12)

, Be concerned because the rate is up for a reason!
(pain, fever, volume status, anxiety/stress, hypoxia)


This is also the first compensatory mechanism for shock.


Sins and symptoms of tachycardia - answer Can be asymptomatic
fatigue
weakness
shortness of breath
orthopnea
decreased O2 sat
restlessness
hypotension


Tachycardia treatment - answer Avoid substances that can rise heart
rate
develop stress management techniques
bedrest if causing hypotension


Sinus arrhythmia - answer The rate is usually normal to slow
the rhythm is regular
there is one P Way for every QRS complex and they all look alike
PRI is normal 0.12-0.20
QRS is 0.04-0.12 seconds


Occurs normally in the very young and very old
Changes in intrathoracic pressure from breathing impacts the
rhythm of the heart

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