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More pronounced diastolic left ventricular dysfunction in patients with accelerated idioventricular rhythm after

Maurice Remmelink1, Ronak Delewi, Ze Yie Yong

  • 1Department of Cardiology, Academic Medical Center - University of Amsterdam, Amsterdam, The Netherlands. m.remmelink@amc.uva.nl

The Journal of Invasive Cardiology
|December 4, 2010
PubMed

Insights

Reperfusion-induced accelerated idioventricular rhythm (AIVR) in ST-elevation myocardial infarction (STEMI) patients indicates significant diastolic left ventricular (LV) dysfunction. This arrhythmia suggests impaired LV relaxation and compliance, highlighting its role as a marker of cardiac dysfunction post-primary percutaneous coronary intervention (pPCI).

Area of Science:

  • Cardiology
  • Cardiac Electrophysiology
  • Myocardial Infarction Research

Background:

  • Reperfusion-induced accelerated idioventricular rhythm (AIVR) during primary percutaneous coronary intervention (pPCI) for ST-elevation myocardial infarction (STEMI) may signal underlying left ventricular (LV) dysfunction.
  • Understanding the dynamic LV effects associated with AIVR is crucial for assessing reperfusion outcomes.

Purpose of the Study:

  • To compare the dynamic effects of reperfusion on LV function in STEMI patients with and without AIVR during pPCI.
  • To elucidate the relationship between AIVR occurrence and the severity of diastolic LV dysfunction.

Main Methods:

  • A study involving 15 first-time anterior STEMI patients within 6 hours of symptom onset.
  • Direct acquisition of LV pressure-volume (PV) loops during pPCI to assess LV function.
  • Comparison of immediate post-pPCI LV function between patients with (n=5) and without (n=10) AIVR, and analysis of AIVR's direct impact on LV function versus sinus rhythm.

Main Results:

  • Patients experiencing reperfusion-induced AIVR exhibited more severe pre-existing diastolic LV dysfunction, including delayed relaxation (Tau: 53 ± 15 vs. 39 ± 6 ms; p=0.03), reduced compliance (p=0.01), and higher end-diastolic stiffness (p=0.07).
  • Following pPCI, AIVR patients showed less improvement in diastolic LV function, evidenced by a downward shift in the compliance curve (-3.1 ± 2.3 vs. -7.5 ± 1.4 mmHg; p=0.001) and diminished reduction in end-diastolic stiffness (13 ± 18 vs. 34 ± 15%; p=0.03).

Conclusions:

  • Reperfusion-induced AIVR in STEMI patients undergoing pPCI is associated with more pronounced diastolic LV dysfunction both before and after the arrhythmia.
  • Diastolic LV dysfunction appears to be a contributing factor to the occurrence of AIVR.
  • AIVR serves as a significant clinical sign of diastolic LV dysfunction following reperfusion therapy in STEMI.
Abstract

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