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Pulsus alternans caused by 2:1 left bundle branch block
1Division of Cardiology, University of South Florida College of Medicine and Tampa General Hospital, USA. ssbarold@aol.com
Summary
Pulsus alternans, a pulse irregularity, resulted from a complete left bundle branch block. This condition significantly impacted heart function even with preserved ejection fraction.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Heart Failure Research
Background:
- Pulsus alternans is an irregular pulse characterized by alternating strong and weak beats.
- Left bundle branch block (LBBB) can affect cardiac function and hemodynamics.
- Understanding the interplay between LBBB and ventricular function is crucial for managing heart conditions.
Observation:
- A case study identified a 2:1 left bundle branch block as the cause of pulsus alternans.
- The patient presented with a left ventricular ejection fraction of 50% and normal coronary arteries.
- Hemodynamic monitoring revealed significant cardiac depression.
Findings:
- Complete left bundle branch block was directly linked to the development of pulsus alternans.
- The hemodynamic effects of LBBB were profound, even in the presence of a preserved left ventricular ejection fraction (50%).
- This suggests LBBB can significantly impair systolic function.
Implications:
- The findings highlight the critical role of the His-Purkinje system in maintaining coordinated ventricular contraction.
- This case underscores the potential for LBBB to cause significant hemodynamic compromise.
- Further research into LBBB's impact on systolic function is warranted, particularly in patients with preserved ejection fraction.