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[Atrial fibrillation--the value of transesophageal echocardiography]
1Abteilung Kardiologie, Universitätsklinikum-Gesamthochschule-Essen.
Insights
Transesophageal echocardiography (TEE) better detects left atrial thrombi and spontaneous echocardiographic contrast than transthoracic echocardiography (TTE), especially in atrial fibrillation patients. TEE aids in assessing left atrial appendage function, crucial for preventing cardioversion-related emboli.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Atrial fibrillation increases the risk of left atrial thrombi and spontaneous echocardiographic contrast.
- Left atrial appendage dysfunction is common in lone atrial fibrillation patients, elevating embolic risk.
Purpose of the Study:
- To compare the efficacy of transesophageal echocardiography (TEE) versus transthoracic echocardiography (TTE) in detecting left atrial abnormalities.
- To evaluate the role of TEE in assessing left atrial appendage function and guiding cardioversion decisions.
Main Methods:
- Retrospective analysis comparing TEE and TTE findings in patients with atrial fibrillation.
- Assessment of left atrial appendage flow velocity and function using Doppler echocardiography.
Main Results:
- TEE demonstrated superior detection of left atrial thrombi and spontaneous echocardiographic contrast compared to TTE.
- Reduced flow velocity or absence of flow in the left atrial appendage was observed in a significant proportion of lone atrial fibrillation patients.
- Left atrial thrombi were identified in 12% of patients, highlighting the risk associated with cardioversion.
Conclusions:
- TEE is more effective than TTE for identifying thrombi and spontaneous echocardiographic contrast in atrial fibrillation.
- Assessment of left atrial appendage function via TEE is vital for risk stratification and preventing cardioembolic events.
- TEE can help avoid unnecessary cardioversions, thereby reducing the risk of embolization, especially when anticoagulation is inadequate.
Abstract:
Transesophageal echocardiography is superior to transthoracic echocardiography in detection of superior to transthoracic echocardiography in detection of left atrial thrombi and spontaneous echocardiographic contrast, particularly in patients with atrial fibrillation and spontaneous echocardiographic contrast, thrombus formation is likely. In addition to the morphology, Doppler-echocardiography can be used to access left atrial appendage function. In patients with lone atrial fibrillation, reduced velocity was found in 60%, and no flow was detected in the left atrial appendage in 40%. These patients had a higher risk for spontaneous echocardiographic contrast and thrombus formation. As left atrial thrombi are found in 12% of patients, transesophageal echocardiography can be used to avoid cardioversion in these patients, which may lead to cerebral or peripheral emboli. Despite ruling out left atrial thrombi, embolism occurred after cardioversion when anticoagulation was insufficient or not performed. Current investigations are undertaken in order to demonstrate the clinical benefit of transesophageal echocardiography in patients with left atrial fibrillation.