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