Mayo Clinic EKG Review Questions with Answers All Correct
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Course
Mayo Clinic EKG
Institution
Mayo Clinic EKG
Mayo Clinic EKG Review Questions with Answers All Correct
What are the three pacemaker sites? - Answer-SA
AV
Purkinje Fibers
Normal/Inherent rates of pacemaker sites? - Answer-SA: 60-100
AV: 40-60
Purkinje: 20-40
If you see a P wave on an ECG, does this mean that the atria contracted? - ...
If you see a P wave on an ECG, does this mean that the atria contracted? - Answer-No
Normal PRI? - Answer-0.12-0.20
Normal QRS? - Answer-<0.12
Normal QT? - Answer-0.35-0.43
What does a P wave represent? - Answer-Atrial depolarization
What pacemaker sites can produce P waves? - Answer-SA and AV
What does a prolonged PRI indicate? - Answer-Heart Block
What does the QRS complex represent? - Answer-Ventricular depolarization
What two parts of an ECG represent ventricular repolarization? - Answer-ST segment
T wave
Where do sinus rhythms originate from? - Answer-AV
What part of the autonomic nervous system is responsible for sinus tach> - Answer-
Sympathetic
What makes up the AV junction? - Answer-AV node, bundle of HIS, tissue
What is the purpose of the AV junction? - Answer-Delays impulse for the atrial kick/first
line of backup
Normal rate for AV junction? - Answer-40-60
What is unique about the P wave in junctional rhythms? - Answer-Short PRI
, Hidden P wave
Retrograde P wave after QRS
PRI in junctional rhythms? - Answer-<0.12
Width of QRS in junctional rhythms? - Answer-<0.12
All beats are conducted in which heart block? - Answer-1st Degree
Some beats are conducted in which heart block? - Answer-2nd Degree
No beats confucted in which heart block? - Answer-3rd Degree
Where does a delay in the AV node show up on an ECG? - Answer-P wave
How does a sinus P wave differ from an atrial P wave? - Answer-Early, late, inverted,
hidden
What two basic mechanisms can cause an atrial focus to take over pacemaking
responsibilities? - Answer-Atrium firing differently/more rapidly
SA not functioning
What is the purpose of ECG? - Answer-Measures electrical physiology of the heart,
rate/rhythm, and electrical activity.
The pacemaker site within the ________ generally controls the heart. - Answer-Atria
The sympathetic nervous system ___________ heart rate, conduction, and irritability. -
Answer-INCREASES
The parasympathetic nervous system ___________ heart rate, conduction, and
irritability. - Answer-DECREASES
PR Interval - Answer-0.12-0.20, 3-5 small boxes
QRS Complex - Answer-< 0.12, 3 small boxes
QT Interval - Answer-0.35-0.43
Refractory Period - Answer-2nd half of T wave, where impulses get through
Large Square Method - Answer-# of big squares between two R waves, divided into 300
Small Square Method - Answer-# of small squares between two R waves, divided into
1500
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