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Relationship of left atrial appendage function to left ventricular function.

Asha Mahilmaran1, Pradeep G Nayar, G Sudarsana

  • 1Institutefor Cardiac Treatment and Research, Southern Railway Hospital, Chennai. ashamahil@hotmail.com

Indian Heart Journal
|December 14, 2004
PubMed
Summary

Left ventricular dysfunction impairs left atrial appendage function, leading to reduced blood flow velocities and a higher risk of thrombus formation, even in patients with normal heart rhythm.

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Area of Science:

  • Cardiology
  • Echocardiography
  • Thrombosis

Background:

  • Left ventricular dysfunction is a common cardiovascular condition.
  • The left atrial appendage is a potential site for thrombus formation.
  • Sinus rhythm does not always prevent thrombus formation in the left atrial appendage.

Purpose of the Study:

  • To evaluate the relationship between left atrial appendage function and left ventricular function.
  • To determine if left ventricular dysfunction increases the risk of left atrial appendage thrombus formation in patients with sinus rhythm.

Main Methods:

  • Transesophageal echocardiography was used to assess left atrial appendage function.
  • Patients were categorized into groups based on left ventricular ejection fraction.
  • Presence of spontaneous echo contrast and thrombus was evaluated.

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Main Results:

  • Patients with severe and moderate left ventricular dysfunction showed significantly lower left atrial appendage emptying and filling velocities compared to those with preserved function.
  • Left atrial appendage thrombus was found in 38% of patients with severe left ventricular dysfunction and 28% with moderate dysfunction.
  • No thrombus was observed in patients with preserved left ventricular ejection fraction.

Conclusions:

  • Left ventricular dysfunction is associated with impaired left atrial appendage function, characterized by reduced blood flow velocities.
  • Left ventricular dysfunction significantly increases the incidence of left atrial appendage thrombus formation, irrespective of heart rhythm.