11. EKG part 3 Flashcards Preview

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Flashcards in 11. EKG part 3 Deck (11):

What does it mean to be balanced and bipolar on an ECG? Significance for QRS complex?

  • Equal amplitudes up (+) & down (-)
  • QRS complex is balanced and bipolar --> axis travels perpendicular to this lead


What are the steps you take every time you encounter an EKG?

  1. Determine if EKG is interpretable
  2. Determine the rate
  3. Check conduction system (pr & QRS intervals)
  4. Determine the axis
  5. Analyze the rhythm


What is the normal appearance of the aVR lead?

  • P and QRS are negative


Why is it normal for the aVR lead to be negative?

It's the only lead viewing the heart's receding depolarization from above


What is the most common cause of upright P and QRS waves lead aVR?

Switched limb leads


What 4 characteristics do we evaluate to confirm the cardiac rhythm?

  • Rate/timing
  • QRS width
  • P wave characteristics
  • Regularity of cardiac cycles


What does a narrow QRS width denote? Wide?

  • Narrow: supra-ventricular origin
  • Wide: ventricular origin


What are the criteria for a normal sinus rhythm?

  • HR = 60-100 bpm
  • QRS width is narrow (<0.10 ms)
  • P wave is positive in lead II
  • PR duration 0.12 - 0.20 ms
  • 1:1 P:QRS ratio
  • Regularly spaced QRS's


What is sinus arrhythmia?

Phasic variation of HR w/ inspiraiton (higher HR) and expiration (lower HR)


What characterizes a high atrial premature beat?

Upright P wave suggests an ectopic focus high in the atria


What characterizes a junctional premature beat?

  • Inverted (retrograde) or absent P wave
  • P waves too close to QRS (<0.12 secs)