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  #1  
Old 10-27-2012
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Question cardio EKG q

Q) In EKG, papillary muscle repolarization correspond to the following wave..?

a) P wave
b) T wave
c) QRS complex
d) ST segment
e) PR interval
f) U wave
g) delta wave
H) R wave

i'm not sure abt the answer....based on kaplan qbank concept i asked it...thanks

Last edited by venky2600; 10-27-2012 at 06:01 AM.
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  #2  
Old 10-27-2012
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QRS complex...it should conside with closure of Mitral valve?
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Old 10-27-2012
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I think the answer is QRS
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Old 10-27-2012
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Quote:
Originally Posted by KovachMarina View Post
I think the answer is QRS
No , it s U wave
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Old 10-27-2012
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Default my answer F

U wave---> indicates lately repolarization of purkinje or papillary muscles,,, can be anormal in isquemia or hipokalemia
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Repolarisation of papillary muscle is classical of u wave.Which can be caused by hypokalemia or bradycardia
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Old 10-27-2012
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Interesting,I thought U wave is seen only in Hypokalemia & bradycardia.
Thanx for question @ vencky
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Old 10-27-2012
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The FA diagram on pg.283 has that contraction of the ventricles continues till after the end of T wave. So I will go with the U wave option mate as that seems like the only logical option left.

For people like me, who are rarely satisfied without references, I am not sure whether copying uptodate verbatim here would be included in copyright infringement, but uptodate says that U waves indicate repolarization of HIS purkinje bundle or papillary muscles. So yeah, I think we are cool
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Old 10-27-2012
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Correct Answer F is right

well done all of you...
yes, the right answer is F) U wave------>represents papillary muscle or purkinje fibers repolarization..

U waves follow T wave..they are not normally seen in all individuals..associated with conditions like hypokalemia,hypercalcemia,digitalis treatment...inverted U waves associated with myocardial ischemia.......

a) P wave----atrial depolarization
b) T wave-----ventricular repolarization
c) QRS complex-------ventricular depolarization(also atrial repolarization)
d) ST segment------still ventricular depolarization
e) PR interval--------ventricular filling interval(conduction delay via AV node)
g) delta wave--------negative wave in WPW syndrome(represent short PR interval)
H) R wave
-----------mitral valve closure(S1 heart sound)

unfortunately i couldnt give much info abt the answer....i couldnt find what are the wave forms in normal individuals in case of papillary muscle repolarization .....if anyone finds any references or opinions..pls do share here.....
thanks
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Old 10-27-2012
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i think its t wave
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Old 10-28-2012
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Quote:
Originally Posted by venky2600 View Post
well done all of you...
yes, the right answer is F) U wave------>represents papillary muscle or purkinje fibers repolarization..

U waves follow T wave..they are not normally seen in all individuals..associated with conditions like hypokalemia,hypercalcemia,digitalis treatment...inverted U waves associated with myocardial ischemia.......

a) P wave----atrial depolarization
b) T wave-----ventricular repolarization
c) QRS complex-------ventricular depolarization(also atrial repolarization)
d) ST segment------still ventricular depolarization
e) PR interval--------ventricular filling interval(conduction delay via AV node)
g) delta wave--------negative wave in WPW syndrome(represent short PR interval)
H) R wave
-----------mitral valve closure(S1 heart sound)

unfortunately i couldnt give much info abt the answer....i couldnt find what are the wave forms in normal individuals in case of papillary muscle repolarization .....if anyone finds any references or opinions..pls do share here.....
thanks
Harrison's 18th edition:

"The QRS complex represents ventricular depolarization, and the ST-T-U complex (ST segment, T wave, and U wave) represents ventricular repolarization."

"The normal U wave is a small, rounded deflection (1 mm) that follows the T wave and usually has the same polarity as the T wave. An abnormal increase in U-wave amplitude is most commonly due to drugs (e.g., dofetilide, amiodarone, sotalol, quinidine, procainamide, disopyramide) or to hypokalemia. Very prominent U waves are a marker of increased susceptibility to the torsades de pointes type of ventricular tachycardia"
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  #12  
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g) delta wave--------negative wave in WPW syndrome(represent short PR interval)

Not sure but i think delta wave is more over due to AV conduction and re-entrant pathway which shorten PR interval and lead to early ventricular contraction.
P.S I am not contraindicating. Just sharing my thought.
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  #13  
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Post

thanks both of you for adding much needed info-------@nooranimm and @koolkiller88

@koolkiller88-----you're true that delta wave due to AV conduction....
i kinda mixed it up here in WPW --->short PR interval + rapid upstroke of QRS(delta wave).......PR interval shortening not represents delta wave

hope it understands...thanks
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