Sudden appearance of new clot

Area of Science:

• Cardiology
• Medical Imaging
• Echocardiography

Background:

• Mitral stenosis (MS) and chronic atrial fibrillation (AF) are significant risk factors for left atrial (LA) and left atrial appendage (LAA) thrombus formation.
• Spontaneous echo contrast (SEC) in the LA is a marker of blood stasis and increased thromboembolic risk.

Observation:

• Patients presenting with MS, chronic AF, enlarged LA, and SEC warrant evaluation for LA/LAA thrombus.
• Transesophageal echocardiography (TEE) demonstrates higher sensitivity in detecting LA/LAA thrombus compared to transthoracic echocardiography (TTE).

Findings:

• Despite TEE's sensitivity, false-negative results are possible, particularly in cases of complex or multilobed LAA morphology.
• The potential for missed thrombus detection highlights limitations in current imaging protocols for specific patient subgroups.

Implications:

• Accurate thrombus detection is crucial for guiding anticoagulation therapy and preventing cardioembolic stroke in MS and AF patients.
• Further research may be needed to refine TEE protocols or explore adjunctive imaging techniques for enhanced thrombus visualization in challenging LAA anatomies.
• Understanding the limitations of TEE in detecting LAA thrombus is vital for clinical decision-making and patient risk stratification.