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19 Cards in this Set
- Front
- Back
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What are the types of bradyarrhythmias?
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Sinus Bradycardia, Tachy-brady Syndrome, Heart Block
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What is sinus bradycardia?
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Sinus node that beats at a rate less than 60 bpm. Normal people can have this too
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What is tachy-brady syndrome?
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aka sick sinus syndrome. Period of tachyarrhythmia followed by a prolonged pause
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What is 1st degree heart block?
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Delay in conduction at the AV node (PR interval > .2 --- a large square). In 1st degree heart block there are no dropped beats just an increasing interval.
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What is 2nd degree heart block?
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2nd Degree there is an intermittent failure of conduction. Two types: Mobitz I & Mobitz II
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What is Mobitz I heart block?
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2nd degree. AV block (not His-Purkinje); progressive lengthening of the PR interval preceding the dropped beat
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What is Mobitz II heart block?
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2nd degree. No change in P-R interval preceding the dropped beat; the QRS complex is often prolgoned due to underlying His-Purkinje disease
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What is 3rd degree heart block?
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It is persistent failure of conduction (all atrial beats are blocked). 2 types: Complete HIs-Purkinje Block and Complete AV Nodal Block.
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What is complete His-Purkinje block?
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perfectly constant Ventricular Rate and Atrial rate, but they are depolarizing independently
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What is complete AV Nodal block?
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Ventricular rate is 40-60 bpm; Normal (narrow) QRS. Every other P wave doesn't have a QRS complex.
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What is the blood supply to the AV node?
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right coronary artery (RCA) or circumflex artery
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What is the blood supply to the his-purkinje system?
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Anterior Descending Artery (LAD)
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What is AV Nodal Reentrant Tachycardia/ what would you see on EKG?
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It is a reentrant circuit in the AV node; Regular Rate (150-280); P-waves buried in QRS complex; carotid sinus massage terminates or has no effect
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What can you expect to see in Wolff-parkinson White Syndrome?
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A great re-entry example! ormally, will see a delta-wave on an ECG. However, when a stimulus (VPB) comes along and triggers signals that pass through the “Bundle of Kent” retrograde (note: retrograde P-wave) in the opposite direction. This leads to Supraventricular Tachycardia (SV tachycardia has a narrow QRS complex!)
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What is the automatic (ectopic) atrial tachycardia?
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rapid atrial beat is apparent; common; relies on automaticity; results from hypokalemia; an AV block will prevent the ventricle from contracting quickly as well; carotid massage does nothing; common in patients with lung disease
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What is atrial flutter? (what would you see)
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depolarizing atrium at 300 bpm; constant firing; AV block prevents ventricular 1:1 contraction; carotid massage will increase degree of AV block (which is BAD)
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What is atrial fibrillation?
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irregular undulating baseline fibrillation waves; ventricular response is irregularly irregular; carotid sinus increases block (slowing ventricular response); most common supraventricular arrhythmia
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Whati s Ventricular Tachycardia?
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reentrant circuit in myocardial scar; seen in patients with history of MI; AV dissociation; atrium and ventricle depolarize independently; wide bizarre QRS
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What is Ventricular Tachycardia (Long QT-syndrome Torsade de Pointes)
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frequently caused by iatrogenic mechanisms – trying to treat reentry with Class I/III anti-arrhythmia drugs
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