Cardiac Dysrhythmias II

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Anonymous
ID:
108391
Filename:
Cardiac Dysrhythmias II
Updated:
2011-10-12 10:25:54
Tags:
Dysrhythmias
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cardiac Dysrhythmias
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  1. atrial
    depolarization
    p wave
  2. ventricular
    depolarization
    QRS
  3. ventricular
    repolarization
    • T
    • wave
  4. PR
    interval
    • 0.12
    • - 0.20 seconds
  5. QRS
    interval
    • <
    • 0.12 seconds
  6. QT
    interval
    • -
    • 0.35 - 0.45 seconds or less than 1/2 the preceding R-R interval
  7. Sinus
    bradycardia
    • (aerobically trained individuals, sleeping) < 60 / minute
    • Valsalva maneuver, Beta blockers, Symptomatic
  8. Bradycardia
    syncope Treatment
    atropine
  9. Sinus
    tachycardia
    • (exercise,
    • fever, pain, hypovolemia, HF) > 100 / minute.
  10. Sinus
    tachycardia Treatment
    • Treat
    • the underlying cause. IV beta blockers.
  11. Atrial
    fibrillation
    • Erratic
    • depolarization of atria
  12. Atrial
    fibrillation Etiology
    • ischemic heart disease (CAD)
    • Develops acutely with thyrotoxicosis, alcohol intoxication,
    • caffiene use, stress, electrolyte imbalance.
    • May be seen in absence of disease
  13. Atrial
    fibrillation
    • No discernible P waves
    • Wavy baseline
    • Irreg. R-R interval
    • Narrow QRS
  14. Atrial
    Fibrillation
    • HR A: 350-650 b/p/m
    • HR V: slow to rapid
    • Rhythm: Irregular
  15. Atrial
    Flutter
    • Irritable site depolarizes regularly at a rapid rate. AV
    • node stops all impulses from getting through.
  16. Flutter
    Atrial rate
    • 230-430 / minute (usu. 300)
    • Ventricular response with - block 150-200
    • Flutter Most easily recognized in leads - II, III, aVF
  17. Atrial
    flutter etiology
    • Hyperthyroidism
    • Valvular heart disease
    • Pericardial disease
    • Acute pulmonary embolism
    • Congenital heart disease
    • Sick sinus syndrome
    • Idiopathic causes
  18. Atrial
    Flutter
    • HR A: 220-340b/p/m
    • HR V: <300
    • Rhythm: Regular or variable
  19. PVC
    • Premature ventricular complexes (PVC) mean that the extra
    • beats originate from the lower pumping chamber called the ventricle
  20. Ventricula
    tachycardia
    • Characteristics
    • Wide QRS complexes
    • Rate 100-250
    • R-R nearly regular
    • P unrelated to QRS
  21. Ventricula
    tachycardia Etiology
    • MI, CAD, cardiomyopathy
    • Electrolyte imbalance (esp. K+, Mg)
  22. Ventricula tachycardia Treatment
    • Unstable - ID precipitating cause
    • Stable - O2, ventricular dysrthmics (amiodarone, lidocaine)
    • Unstable - add cardioversion
  23. Ventricular
    Fibrillation
    • HR 300-600
    • Rhythm: Extremely Irregular
    • P Wave: Absent
    • PR Intervals in sec: N/A
    • QRS Fibralotory
  24. Heart
    Block 1st
    • Prolonged
    • pr interval > 0.20 seconds
  25. Heart
    Block 2nd °Mobitz I - - wenckebach
    progressive  pr interval until one complex is dropped
  26. Heart
    Block Mobitz II
    intermittent AV block (every other complex is conducted)
  27. 3rd
    • no
    • communication between atria & ventricles

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