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[Echocardiographic diagnosis of left intraventricular thrombus. A comparative study of 2.5, 3.5 and 5 MHz
F Philippe1, E Florens, G Drobinski
1Service de cardiologie, Groupe hospitalier Pitié-Salpêtrière, Paris.
Insights
Higher frequency echocardiography (3.5 MHz) effectively detects left ventricular mural thrombosis, outperforming lower frequencies (2.5 MHz). This improves diagnosis in patients with heart dysfunction.
Area of Science:
- Cardiology
- Medical Imaging
- Echocardiography
Background:
- Left ventricular mural thrombosis is a complication of left ventricular dysfunction.
- Accurate detection is crucial for patient management, especially those on anticoagulant therapy.
Purpose of the Study:
- To compare the efficacy of 2.5, 3.5, and 5 MHz ultrasonic transducers in detecting left ventricular mural thrombosis.
- To evaluate the impact of transducer frequency on diagnostic sensitivity and specificity.
Main Methods:
- Prospective, comparative echocardiographic study of 53 patients with left ventricular dysfunction.
- Patients included those with ischemic heart disease and dilated cardiomyopathy.
- Diagnosis of thrombosis followed Asinger's classification.
Main Results:
- Eleven thrombi were detected (21% incidence).
- The 3.5 MHz transducer showed 100% sensitivity and 97% specificity, outperforming the 2.5 MHz transducer (55% sensitivity, 86% specificity).
- Atrial fibrillation was significantly associated with mural thrombosis (p=0.04).
Conclusions:
- Higher frequency transducers (3.5 MHz) enhance echocardiographic sensitivity for left ventricular mural thrombosis detection.
- Transducer frequency is a key factor, though patient echogenicity can be a limitation.
- Variable frequency transducers may improve diagnostic accuracy.
Abstract:
The authors undertook a prospective and comparative echocardiographic study of 2.5, 3.5 and 5 MHz ultrasonic transducers for the detection of left ventricular mural thrombosis in 53 patients with left ventricular dysfunction. Thirty-three patients had advanced ischaemic heart disease following anterior myocardial infarction and 20 had dilated cardiomyopathy with a left ventricular ejection fraction of < or = 40%. Eighty-two per cent of patients had anticoagulant therapy. The diagnosis of thrombosis was based on Asinger's classification. Eleven thrombi were detected, an incidence of 21%. Using the 5 MHz transducer as a reference, the sensitivity of the 3.5 MHz transducer was 100% and much greater than that of the 2.5 MHz transducer (55%) which was associated with 4 false positive results. The specificities were respectively 97 and 86% for the 3.5 and 2.5 MHz transducers. There was no correlation between the apical Doppler flow velocities and the presence of mural thrombosis. Atrial fibrillation was significantly associated with mural thrombosis (p = 0.04). The increased sensitivity associated with transducers of higher frequency is, however, limited by the echogenicity of patients. The introduction of transducers of variable frequencies should facilitate the diagnosis and improve the sensitivity of echocardiography in detecting left ventricular mural thrombosis.