Montemayor's Stupid Fucking DSAs Flashcards by Matt Stanton | Brainscape

Q

U wave

A

rarely seen

represents the repolarization of papillary muscles

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Q

what is a lead?

A

defined by two electrodes

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Q

purpose of right leg electrode?

A

grounding

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Q

what does the V stand for?

A

unipolar

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Q

augmented leads

A

unipolar

compare positive limb electrode with an average of the two negative electrodes

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Q

P wave

A

how long atrial depolarization takes

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Q

PR interval

A

how long for action potential to conduct through AV node before activating ventricles

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Q

QRS complex

A

how long it takes wave of depolarization to spread throughout ventricles

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Q

QT interval

A

how long ventricles remain depolarized and is thus a rough measure of overall length of ventricular action potential

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Q

sinus tachycardia

A

faster than normal rhythm

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Q

sinus bradycardia

A

slower than normal rhythm

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Q

sinus arrhythmia

A

subtle change in heart rate with each respiration cycle

inspiration accelerates
expiration slows

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Q

loss of sinus arrhythmia can indicate what?

A

loss of autonomic innervation

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Q

wolff parkinson white syndrome

A

abnormal conduction path

-bundle of kent

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Q

first degree AV block

A

slowing of conduction through the AV node

unusually long PR interval

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Q

second degree AV block

A

tissues conduct some impulses but not others

two types - mobitz

Q

mobitz type I block

A

PR interval increases gradually with each cycle until AV node fails completely, skipping ventricular contraction

every 3rd or 4th beat fails to conduct to ventricles

Q

mobitz type II block

A

PR interval constant from beat to beat

but every n’th ventricular contraction is missing (no QRS)

Q

rate dependent block

A

when heart rate exceeds a certain level, the ventricular conduction fails

no time to repolarize

Q

third degree AV block

A

no impulses travel either direction

complete heart block

atria and ventricle contract on their own pacemakers

Q

AV dissociation

A

when the atria and ventricle contract on their own pacemakers

-when there is complete block

Q

reentry

A

circus movement

can result in tachycardia (bc it acts as fast pacemaker) or fibrillation

Q

two signs of WPW syndrome?

A

shortened PR interval

delta wave (positive deflection at beginning of QRS complex)

Q

supraventricular tachycardia?

A

can be caused by reentry caused by WPW syndrome (alternate conduction pathway)

Q

paroxysmal supraventricular tachycardia?

A

rate exceeds 150 bpm

Q

atrial fibrillation

A

very fast reentry cycle