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6 Cards in this Set
- Front
- Back
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overview |
-QRS will be 0.12 or greater -less than 0.12 is supraventricular -no more fail safe points to back up the ventricles since they are the lowest site -most serious because heart has lost its effectivness and is functioning on its last level of backup support -process of conuction is reveresed instead of conducting atrials 1st ventricles conduct 1st. |
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Premature ventricular complex (PVC) |
- single ectopic beat originating from an irritable ventricular focus that fires premature - irritable focus will come early - No p Wave b/c SA node did not precipitate ventricular depolarization -T waves have a tendency to extend the oposite direction of the QRS complex -Unifocal PVC all pvcs in strip will have simialr apperance becasue it is coming from a single irritable focus -Multifocal pvcs will have a variety of different configuations because it is coming from more than one irritable foci, more serious than unifocal because heart is more irritable. R on T phenomenon - T wave is considered a vulnerable area or relative refractory period -If pvc occurs during that time, it could throw the heart into an uncontrolled reptitive pattern. Runs and couplets, geminy -Sign of increasing irritablity - 2 pvc's in a row before a normal beat is called a couplet - 3 or more PVC's in a row before a normal beat is called a run of V-tach - Bigeminy PVC every other beat - Trigeminy PVC every 2 beats - Quadgeminy PVC every 3 beats Pacemaker- irritable focus within the ventricles Regularity- ectopics will disrup regularity of underlying rhythm Rate- Depends on underlying rhythm and number of ectopics P waves- No p wave, may have a dissociated p wave near pvc PRI- none QRS- wide and bizarre, 0.12 or greater, T wave usually in opposite direction |
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Ventricular Tachycardia VT |
-myocardium is extremly irritable, the ventricular focous could speed up and overide higher pacemaker sites -normally uniform R-R may be slightly irregular -May see occasional p wave coincidentally occuring near QRS -Single focus Pacemaker- Irritable focus within the ventricles Regularity- usually regular, can be slightly irregular Rate- 150-250, can exceed 250 if progresses to ventricular flutter, may be slower than 150, called slow vt if is P waves- no p waves, dissociated p waves may be seen PRI- none QRS- wide and bizarre, 0.12 and greater, T wave usually opposite direction from R wave |
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Ventricular Fibrillation |
-extreme and severe case of ventricular irritability -electric foci in ventricles begin fibrillating -many foci firing in a chaotic, ineffective manner -Heart is not contracting but just quivering, no blood is being ejected Pacemaker- multiple irritable foci within ventricles Regularity- no waves or complexes that cn be analyzed to determine, totally chaotic Rate- cant be determined since there is no discernible waves or complexes P waves- no discernible p waves PRI- none QRS- no discernible QRS |
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Idioventricular Rhythm (Ventricular escape) |
-It is an escape rhythm, meaning it takes over pacemaking of heart due to other pacemaker site failures -20-40bpm because that is the rate of the ventricule and purkinjie fibers - Fail safe rhythm, takes over when other pacemaker sites fail -No p waves b/c AV and SA node have failed Pacemaker- escape focus within the ventricles Regularity- usually regular Rate- 20-40, can drop below 20 P waves- None PRI- none QRS- wide and bizarre, 0.12 or more |
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Accelerated idioventricular |
- Same as idioventricular except site becomes more irritated and beats fater than the normal beat range of 20-40 for the ventricular pacemaker site Rate- 40-99 Rhythm- Usually regular P wave- None PRI- None QRS- wide with 0.12 or longer |
