ACLS Certification Association
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ACLS/BLS Preparation

Key Learning Points

Intervals and Segments

QT Interval Page 9

  • The QT Interval represents depolarization and repolarization of the ventricles.
  • The QT Interval is measured from the beginning of the QRS complex to the end of the T wave.
  • The QT Interval will vary depending on the heart rate, age and gender.

R-R, P-P Interval Page 10

  • P-P intervals verify atrial regularity(a).
  • R-R intervals verify ventricular regularity(b).
  • Rhythm regularity is an important piece of information used in rhythm identification.
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