a MCPHS- Provider I- Ch 27 Management of Pts w/Dysrhythmias
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| Dysrhythmias are disorders of | Formation/Conduction of heart’s electrical impulses
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| Diagnose dysrhythmias | ECG
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| Dysrhythmia naming | Site of origin, Mechanism of formation, Conduction involved
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| Sympathetic stimulation vs. Parasympathetic stimulation r/t Heart rate, AV node conduction & Force of myocardial contraction | S:all increase, P:all decrease
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| Chronotropy vs. Dromotropy vs. Inotropy | C:heart rate, D:AV node conduction, I:force of myocardial contraction
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| # of electrodes r/t 12-lead ECG | 10 w/6 on chest and 4 on limbs
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| Limb electrode placement | Non-bony areas w/out major movement
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| 12-lead ECG reflects electrical activity in | Left ventricle
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| Horizontal axis r/t ECG strip | Time & Rate
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| Vertical axis r/t ECG strip | Voltage/Amplitude
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| Positive deflection vs. Negative deflection | P:ECG waveform moves to top of strip, N:ECG waveform moves to bottom of strip
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| P Wave r/t Atria | Atrial depolarization
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| QRS Complex r/t Ventricle | Ventricular depolarization
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| T Wave r/t Ventricle | Ventricular repolarization
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| Atrial Repolarization r/t ECG strip | Occurs during QRS Complex
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| U Wave | Repolarization of Purkinje fibers
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| PR Interval | Time from SA node stimulation to conduction through AV node, Does not include ventricular depolarization
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| ST Segment r/t Isoelectric line | Analyzed to determine if below/above isoelectric line
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| QT Interval | Total time for ventricular depolarization and repolarization
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| Prolonged QT intervals put Pt at risk for | Torsade de pointes
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| Type of dysrhythmia r/t Torsade de pointes | Ventricular
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| TP Interval | No electrical activity, Isoelectric line
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| PP Interval vs. RR Interval | PP:determines atrial rhythm & rate, RR:determines ventricular rate & rhythm
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| Each small box on ECG strip represents | .04 seconds
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| If RR & PP intervals are same or < .8 seconds | Regular rhythm
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| Contributing factors r/t Bradycardia | H’s and T’s
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| 3 H’s r/t Bradycardia | Hypovolemia, Hydrogen ions(acidosis), Hypoglycemia
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| 3 T’s r/t Bradycardia | Toxins, Thrombosis, Trauma
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| Sinus bradycardia vs. Sinus tachycardia vs. Normal sinus rhythm | Only difference is rate
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| Sinus arrhythmia r/t Respiration | Increases w/inspiration, Decreases w/expiration
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| Atrial flutter r/t AV node conduction | Not all atrial impulses are conducted into ventricle, Therapeutic block at AV node
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| P-wave shape r/t Atrial flutter | Saw-tooth shape
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| Occurs when AV node becomes pacemaker | Junctional/Idionodal rhythm
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| When P waves cannot be identified | Supraventricular tachycardia(SVT)
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| SVT indicates only that rhythm is not | Ventricular tachycardia
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| Emergencies r/t Dysrhythmia | Ventricular tachycardia, Ventricular fibrillation, Idioventricular rhythm, Ventricular asystole
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| Ventricular fibrillation characteristics | Absence of: heartbeat, palpable pulse & respirations
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| AHA guidelines r/t Unconscious adults who experience cardiac arrest d/t Ventricular fibrillation | Induce mild hypothermia for 12-24 hours
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| Idioventricular rhythm | Purkinje fibers become pacemaker
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| Ventricular asystole synonym | Flatline
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| AV blocks occur when | AV node conduction is decreased/stopped
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