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EKG EXAM #1 QUESTIONS AND ANSWERS
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EKG EXAM #1 QUESTIONS AND ANSWERS
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EKG EXAM #1 QUESTIONS ANDANSWERS
Which heart rhythm is characterized by the following:
P waves and QRS are firing on their own (they are disassociated)
Slow ventricular rate. - Answer-3rd degree heart block
Normal PR interval? - Answer-0.12-0.20
Normal QRS? - Answer-0.04-0.12
This heart rhythm changes with inspiration - Answer-Sinus arrhythmia
Rhythm characterized by a sawtooth pattern on EKG - Answer-Atrial flutter
Any rate that is > 150 = - Answer-Supraventricular tachycardia (SVT)
When does PVC become pathologic? - Answer-When there are more than 6/minute
Which heart rhythm is characterized by the following:
Normal sinus rhythm that pauses for a little and then resumes back to normal sinus
rhythm - Answer-Sinus pause
How many PVC's in a row make ventricular tachycardia? - Answer-3 in a row = V tach
What is the difference between ventricular tachycardia and supraventricular
tachycardia? - Answer-The difference is in how wide the QRS is
In SVT, the QRS complex is shorter (< 0.4)
In VT, it is a little wider
QRS greater than 0.12 is characteristic of: - Answer-Bundle branch block
What suggests the diagnosis of SVT rather than V tach? - Answer-SVT has a QRS <
0.14 (it would have a more narrow QRS than VT)
What is the difference between Torsades and ventricular fibrillation? - Answer-Torsades
is more marked than ventriuclar fibrillation
1st degree AV block is characterized by: - Answer-PR interval greater than 0.2
Ion responsible for SA and AV node depolarization - Answer-Calcium
, Ion that initiates myocyte depolarization - Answer-Sodium
An early beat with no P wave is: - Answer-Premature junctional beat
What is the rate for sinus tachycardia? - Answer-100-150
What is the difference between atrial fibrillation and atrial flutter? - Answer-In A fib - no
distinct P waves, QRS = irregularly spaced
The capacity of a single cell to generate action potential sponatneously - Answer-
Automaticity
Right bundle branch block looks like: - Answer-Bunny ears
Left bundle branch block looks like: - Answer-Swoop
What does the QT interval stand for? - Answer-Ventricular depolarization and
repolarization
What is the rate for the AV node? - Answer-40-60
A widened QRS beat is indicative of: - Answer-PVC/PVB
Which coronary artery supplies the AV node? - Answer-Right coronary artery
What is the commonly used lead that we interpret everything from? - Answer-Lead 2
Interior of all cells are _________________ charged
After depolarization, they become ________________ charged - Answer-Negatively
charged
Positively charged
Ion that has an "inward" gradient and ion that has an "outward" gradient - Answer-
Inward - Na
Outward - K
Ion responsible for cell-cell conduction of depolarization through the myocardium -
Answer-Na
Ion responsible for myocardial contraction - Answer-Ca
Ion responsible for repolarization and maintenance of the baseline potential - Answer-K
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