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SVTs

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xibocutie's version from 2017-03-20 01:46

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Question Answer
neck pounding and Cannon A wavessuggestive of AVNRT
Specific type of AVRT that has an accessory pathwayWPW
slurred upstroke of QRS (delta wave), short PR, some prolongation of QRSWPW
In order to dx WPW, if present on EKG only can dx.False. need symptoms as well.
orthodromic AV rentrant tachycardiaOrthodromic indicates that the ventricles are activated through the normal conduction system during the tachycardia. This is the most common type of parosysmal SVT seen in WPW patients.
orthrodromiccounterclockwise, AV-->down to ventricles. Narrow/normal QRS complex (not as wide as in antidromic)
antidromic (less frequently)clockwise, ventricles-->up AV node-->stimulate atria (backwards)...can be seen in WPW. Wide QRS
Most common type of PSVTAVNRT---where the reentrant pathway is within the AV node
AVNRT2 pathways in AV node: one slow with fast refractory period, then the other fast but slow refractory period. Narrow complex QRS, sinus rhythm.
AVNRT: how does the PR interval look?prolonged PR due to conduction solely happening via the slow pathway
symptoms of palpitations and light-headedness should make you think of what?SVTs
What is the difference btw Atrial tachycardia and AVNRT or AVRT?Atrial Tachycardia (AT) is LESS COMMON than AVRT and AVNRT. Unlike the other two, atrial tachycardia may result from reentry, automaticity, or even triggered activity at a distinct focus in the atria.
Atrial Tachycardiarate 100-250. Paroxysmal or show a WARM UP in rate.P wave will look different from a normal P wave rhythm arises from a site distinct from the sinus node. PR interval will look normal though.
pathognomonic "sawtooth" atrial P wave baselineAtrial Flutter
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