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Optimizing Cardiac Resynchronization Therapy (CRT) through EKG Analysis

This presentation by Dr. Irving Tiong, MD, FRCPC, explores the optimization of cardiac resynchronization therapy (CRT) using EKG insights. It covers a brief overview of EKG findings in cardiomyopathy, recent studies on CRT programming, and practical examples from CRT EKGs. The discussion delves into the complexities of patient selection, the impact of QRS width on CRT efficacy, and important considerations such as AV delay. The goal is to enhance understanding of effective CRT application and improve patient outcomes based on EKG morphology and lead placement. **Relevant

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Optimizing Cardiac Resynchronization Therapy (CRT) through EKG Analysis

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Presentation Transcript

  1. Optimization of CRT via EKG Is simple better? Winter Arrhythmia School February 11, 2012 Irving Tiong, MD FRCPC Arrhythmia Service

  2. Goals • Brief overview of EKG findings in cardiomyopathy • Brief overview on newest studies on CRT programming • Examples of CRT EKG • Disclosure None

  3. Is this adequate CRT ?

  4. What about this one?

  5. Cardiac resynchronization therapy (CRT) Class 1 indications: LVEF ≤ 30% NYHA Class II-III QRS ≥ 120 msec (LBBB) However only 2/3 of patients will benefit. WHY? ACC/AHA/HRS 2008 Guidelines

  6. Sweeny et al, Circulation 2011

  7. Fantoni et al . JCE 2005

  8. Singh et al. JACC 2005, 46 PP 48-67

  9. Fluoroscopic view - AP

  10. Optimal LV lead placement by fluoroscopic views

  11. QRS Width and success of CRT Siphal et al, Ann Int Med, 2011

  12. MADIT - CRT Zareba et al . Circulation 2011

  13. Zareba et al . Circulation 2011

  14. What about AV delay? SMART AV trial, Ellebogen et al, Circulation 2011

  15. What to look for on the surface EKG? Sweeney et al, Circulation 2010

  16. Sweeney et al, Circulation 2010

  17. Other factors for achieving successs • Avoid right atrial pacing • Control atrialarrthythmias • Avoid pacing scar • Left ventricular lead placement

  18. Quantification of scar (Selvester QRS score of LBBB)

  19. Prospect - EKG Hsing et al, JCE 2011

  20. Any difference in apical vs non apical position MADIT CRT- Singh et al, Circulation 2011

  21. MADIT-CRT

  22. Is this adequate CRT ?

  23. What about this one?

  24. Conclusion • EKG/QRS morphology during LV lead placement • Change RV-LV delay : Lead III R – QS, Lead V1 QS – R • AV delay - perhaps programmed to AV delay of 120 msec, or 50% of native PR interval if QRS > 150 msec

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