NUR 242 Perfusion Questions with Correct
Answers
what potassium level should cardiac patients be at?
4.0
what magnesium level should cardiac patients be at?
2.0
what is does the SA node do
it is the pacemaker of the heart and causes atrial contraction
what are the secondary pacemakers of the heart, define, and what BPM do they beat at
AV node (40-60 BPM) is ventricular contraction
HIS- purkinje fiber (20-40 BPM)- period of rest
when is a 12 lead ECG used (4)
at one point in time
when there is a change in patients condition
gives all angles of the heart
about 10 seconds
what does a P wave measure?
atrial depolarisation. Atria contracts and causes P wave
What does the QRS segment measure
ventricular depolarisation. the AV node fires at this time
what does the T wave measure
,repolarisation. The ventricles relax
if there is a change in telemetry who should assess
nurse
what does the PR measure
the time it takes for the electricity to go from SA node to AV node
what should you assess before the telemetry if there is a change
The patient!!
make sure pts BP is stable and then assess vitals, get a 12 lead ECG, and determine cause of
dysrhythmia
how do you calculate HR in a 6 second ECG
count number of QRS in one minute and R-R intervals in 6 seconds and multiply by 10
define ST segment
a flat ST is healthy
what med can cause V tach
zofran
what happens during a sinus dysrhythmia
SA node is discharging at an altered rate
causes of sinus bradycardia
vasovagal response (straining, rectal temp, suppository, bowel movement)
Meds (beta blockers, narcotics, sedatives)
, athlete
hypothyroidism
normal sinus rhythm characteristics (5)
HR 60-100
rhythm regular
P wave present
PR interval present
QRS interval present
cues of sinus bradycardia (4)
shallow respirations
decrease BP
only act if symptomatic (dizzy, low BP, pale, diaphoretic, syncope)
chest pain
treatments for sinus bradycardia
-stop what is causing it or decrease dosage
-give atropine, will increase HR (only give if symtomatic)
-if atropine doesn't work, will place pacemaker (will take over for SA node and speed can be
manipulated)
causes of sinus tachycardia (11)
blood loss, stress, caffeine, fever, perfusion issue, hyperthyroidism, anemia, low O2,
dehydration, heart failure, pain
what BPM is sinus tachycardia
Answers
what potassium level should cardiac patients be at?
4.0
what magnesium level should cardiac patients be at?
2.0
what is does the SA node do
it is the pacemaker of the heart and causes atrial contraction
what are the secondary pacemakers of the heart, define, and what BPM do they beat at
AV node (40-60 BPM) is ventricular contraction
HIS- purkinje fiber (20-40 BPM)- period of rest
when is a 12 lead ECG used (4)
at one point in time
when there is a change in patients condition
gives all angles of the heart
about 10 seconds
what does a P wave measure?
atrial depolarisation. Atria contracts and causes P wave
What does the QRS segment measure
ventricular depolarisation. the AV node fires at this time
what does the T wave measure
,repolarisation. The ventricles relax
if there is a change in telemetry who should assess
nurse
what does the PR measure
the time it takes for the electricity to go from SA node to AV node
what should you assess before the telemetry if there is a change
The patient!!
make sure pts BP is stable and then assess vitals, get a 12 lead ECG, and determine cause of
dysrhythmia
how do you calculate HR in a 6 second ECG
count number of QRS in one minute and R-R intervals in 6 seconds and multiply by 10
define ST segment
a flat ST is healthy
what med can cause V tach
zofran
what happens during a sinus dysrhythmia
SA node is discharging at an altered rate
causes of sinus bradycardia
vasovagal response (straining, rectal temp, suppository, bowel movement)
Meds (beta blockers, narcotics, sedatives)
, athlete
hypothyroidism
normal sinus rhythm characteristics (5)
HR 60-100
rhythm regular
P wave present
PR interval present
QRS interval present
cues of sinus bradycardia (4)
shallow respirations
decrease BP
only act if symptomatic (dizzy, low BP, pale, diaphoretic, syncope)
chest pain
treatments for sinus bradycardia
-stop what is causing it or decrease dosage
-give atropine, will increase HR (only give if symtomatic)
-if atropine doesn't work, will place pacemaker (will take over for SA node and speed can be
manipulated)
causes of sinus tachycardia (11)
blood loss, stress, caffeine, fever, perfusion issue, hyperthyroidism, anemia, low O2,
dehydration, heart failure, pain
what BPM is sinus tachycardia
