questions 3

Torsades de Pointes

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Topic updated on 08/16/17 5:45pm

Overview
  • Introduction 
    • form of polymorphic ventricular tachycardia
      • early after depolarization
    • can be caused by
      • hypomagnesemia, hypocalcemia, and hypokalemia 
      • prolonged QT interval due to any cause
        • includes Class IA and Class III antiarrhytmics (except amiodarone)
      • congenital long QT syndromes
        • Jervell and Lange-Nielsen syndrome 
          • autosomal recessive
          • due to defects in cardiac sodium or potassium channels
          • can be associated with congenital sensorineural deafness
        • Romano Ward syndrome
          • autosomal dominant
          • similar to Jervell Lange-Nielsen except NO sensorineural deafness
  • Presentation 
    • characteristic waveform on ECG
      • varying amplitudes of QT height in a waxing/waning pattern
    • can progress to V-fib

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Qbank (2 Questions)

TAG
(M1.CV.79) A 52-year-old patient with a complicated past medical history becomes unstable in the intensive care unit. His monitor depicts the rhythm shown in Figure A. Which of the following electrolyte disturbances may have contributed to his current arrhythmia? Topic Review Topic
FIGURES: A          

1. Hyperchloremia
2. Hypophosphatemia
3. Hyperkalemia
4. Hypercalcemia
5. Hypomagnesemia

PREFERRED RESPONSE ▶
TAG
(M1.CV.222) An ECG from an 8-year-old male with neurosensory deafness and a family history of sudden cardiac arrest demonstrates QT-interval prolongation. Which of the following is this patient most at risk of developing? Topic Review Topic

1. Hypertrophic cardiac myopathy
2. Essential hypertension
3. Cardiac tamponade
4. Torsades de pointes
5. First degree atrioventricular block

PREFERRED RESPONSE ▶
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