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Atrioventricular (AV) Heart Block

Atrioventricular (AV) Heart Block. Chapter 17. Classification of AV Heart Blocks. First Degree Block. prolonged PR interval. Second Degree AV Block. Mobitz type I or Winckebach Mobitz type II. Mobitz Type I. Mobitz Type I.

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Atrioventricular (AV) Heart Block

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  1. Atrioventricular (AV) Heart Block • Chapter 17

  2. Classification of AV Heart Blocks

  3. First Degree Block • prolonged PR interval

  4. Second Degree AV Block • Mobitz type I or Winckebach • Mobitz type II

  5. Mobitz Type I

  6. Mobitz Type I • Progressive lengthening of the PR interval from beat to beat until a beat is dropped. • The PR interval after the nonconducted P wave is shorter than the PR interval before the nonconducted P wave.

  7. Mobitz Type II

  8. Mobitz Type II • Sudden appearance of a single, non-conducted sinus P wave... • ...without... • ...the progressive prolongation of the PR intervals… • ...and the shortening of the PR interval in the beat after the nonconducted P wave.

  9. Advanced Second-Degree AV Block Two or more consecutive nonconducted sinus P waves

  10. Third-Degree (Complete) AV Block

  11. Third-Degree (Complete) AV Block • P waves are present, with a regular atrial rate faster than the ventricular rate • QRS complexes are present, with a flow (usually fixed) ventricular rate • The P wave bears no relation to the QRS complexes, and the PR intervals are completely variable

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