GMS 6474 Final Exam Solved Questions With Revised Correct Detailed Answers
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Course
GMS 6474
Institution
GMS 6474
GMS 6474 Final Exam Solved
Questions With Revised Correct
Detailed Answers
1. What is the rate of the SA node (normal pacemaker) - ANSWER
bpm (fastest)
2. What is the rate of the AV node - ANSWER
40-60 bpm
3. What is the rate of the Purkinje system - ANSWER
20-40 bpm
60-...
GMS 6474 Final Exam Solved
Questions With Revised Correct
Detailed Answers
1. What is the rate of the SA node (normal pacemaker) - ANSWER 60-100
bpm (fastest)
2. What is the rate of the AV node - ANSWER 40-60 bpm
3. What is the rate of the Purkinje system - ANSWER 20-40 bpm
4. Which heart segments have the highest conduction velocity - ANSWER
contractile myocardial cells
5. Which heart segments have the slowest conduction velocity - ANSWER SA
and AV nodes
6. Where is the positive pole of the ECG located in the heart - ANSWER
towards the apex
7. An ECG measures electrical activity of the heart, can it also measure physical
activity - ANSWER no
,8. P wave on an EKG - ANSWER -wave of depolarization moving through
atria
-just before atrial contraction
-1st upward deflection on EKG
9. PR segment on EKG - ANSWER -wave of depolarization moving thru AV
node, bundle of HIS, and purkinje fibers
10. PR interval - ANSWER -also called AV conduction time
-P wave and PR segment
-time for depolarization wave to move thru AV node, SA node, bundle of HIS, and
purkinje fibers
-should be between 0.12-0.20 seconds
11. what does it mean if the PR interval is longer than 0.2 seconds - ANSWER
conduction block in AV node
12. QRS complex on EKG - ANSWER ventricular muscle depolarization
. Just prior to ventricular contraction
.atrial repolarization also happening here
.should be less than 0.10 seconds
13. ST segment on EKG - ANSWER ventricles completely depolarized
,what does it mean if the ST segment is longer or shorter than normal - ANSWER
ischemic event in ventricles
T wave on EKG - ANSWER ventricular muscle repolarization
just before ventricular relaxation
QT interval - ANSWER time when ventricles depolarize and repolarize
should be less than 1/2 of RR interval
how will heart rate affect the QT interval - ANSWER fast heart rate: shorter
QT
slow heart rate: longer QT
RR interval on EKG - ANSWER from peak of one QRS complex to peak of
another
can be used to calculate heart rate
should be around 0.80 seconds
TP segment on EKG - ANSWER atrial and ventricular diastole
, heart relaxed and filling with blood
how many seconds is a little box on an EKG - ANSWER 0.04 seconds (5 little in
1 big)
how many seconds is a big box on an EKG - ANSWER 0.2 seconds
how to calculate heart rate on an EKG - ANSWER -count either # of little
boxes or big boxes in between 2 R intervals
example:
there are 20 little boxes between the Rs
20 x 0.04 = 0.80 seconds a beat
60 x 80 = 75 bpm
large box method to determine HR on EKG - ANSWER 1 big box between Rs =
300 bpm
2 = 150 bpm
3 = 100 bpm
4 = 75 bpm
5 = 60 bpm
6 = 50 bpm
7 = 43 bpm
what is the MEA - ANSWER mean electrical axis of the heart
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