Related Experiment Videos
Spontaneous inversion of the left atrial appendage
Dianna S Meredith1, Thomas R Kimball
1Division of Cardiology, Cincinnati Children's Medical Center, Cincinnati, OH 45229, USA. Stacy.Meredith@cchmc.org
Summary
Supraventricular tachycardia can cause spontaneous inversion of the left atrial appendage due to negative pressure. Normal sinus rhythm reversed this condition, avoiding surgery.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Cardiovascular Imaging
Background:
- The left atrial appendage (LAA) is a pouch-like structure in the left atrium.
- LAA morphology and function are crucial in cardiovascular health.
- Spontaneous inversion of the LAA is a rare phenomenon.
Observation:
- A case of spontaneous inversion of the left atrial appendage (LAA) was observed.
- This inversion was triggered by acute decrease in ventricular volume and shortened diastole during supraventricular tachycardia.
- Negative intrathoracic pressure during tachycardia led to invagination of the LAA.
Findings:
- The primary finding was the transient, spontaneous inversion of the left atrial appendage.
- The mechanism involved acute hemodynamic changes during supraventricular tachycardia.
- Restoration to sinus rhythm and normalization of left-sided diastolic pressures spontaneously reversed the LAA inversion.
Implications:
- This case highlights a novel, reversible cause of left atrial appendage inversion.
- Understanding this mechanism may prevent misdiagnosis and unnecessary surgical interventions.
- Further research into hemodynamic effects on LAA morphology is warranted.