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Mobitz type II delay.

G Oreto1, F Luzza, G Satullo

  • 1Istituto Pluridisciplinare di Clinica Medica, Università di Messina, Italy.

American Heart Journal
|November 1, 1988
PubMed
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Mobitz type II block typically involves blocked conduction. This study introduces Mobitz type II delay, a new phenomenon where impulses are followed by conduction delays rather than complete blocks, affecting heart rhythms.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Arrhythmias

Background:

  • Mobitz type II second-degree atrioventricular (AV) block is characterized by consistent conduction times followed by a dropped beat.
  • This condition necessitates careful diagnosis and management due to its association with higher-grade blocks.

Observation:

  • A novel manifestation of Mobitz type II phenomenon is observed.
  • Instead of complete block, consecutive impulses with constant conduction times are followed by a delay in conduction.

Findings:

  • At the AV junction, this delay presents as an unexpected prolonged PR interval followed by a shorter PR interval.
  • At the sinoatrial junction, during regular sinus rhythm, it appears as a sudden unexpected prolongation of a P-P interval, followed by a shortened P-P interval.

Related Experiment Videos

  • This newly identified phenomenon is termed Mobitz type II delay.

    • Implications:

    • This finding expands the understanding of Mobitz type II block variations.
    • It may lead to revised diagnostic criteria and management strategies for certain cardiac conduction disturbances.
    • Further research is warranted to elucidate the clinical significance and underlying mechanisms of Mobitz type II delay.