Copyright © 2005, The European Society of Cardiology
Comparison of transthoracic echocardiography using second harmonic imaging, transcranial Doppler and transesophageal echocardiography for the detection of patent foramen ovale in stroke patients
aDepartment of Medicine and Cardiology, Hospital Clermont Ferrand, Rue Montalembert, 63000 Clermont Ferrand, France
bDepartment of Biostatistics, Hospital Clermont Ferrand, Rue Montalembert, 63000 Clermont Ferrand, France
Received 14 January 2005; received in revised form 22 April 2005; accepted after revision 27 April 2005.
* Corresponding author. Tel.: +33 514 725 9246. gacsouteyrand{at}sympatico.ca
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Abstract |
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Aims The comparison of three imaging methods to determine which is the most accurate and reliable for the detection of right-to-left shunt.
Methods and results One hundred and seven patients who were hospitalized for stroke underwent: a transthoracic echocardiography (TTE) using second harmonic, a transcranial Doppler (TCD) and a transesophageal echocardiography (TEE) from August 2003 to April 2004.
All studies were recorded on a videotape and were studied by a physician blinded to the study.
With TTE and TEE, we found 44 (41%) patent foramen ovales. All contrast tests were positive with TCD for these 44 patients.
For two patients, the contrast test was positive only with TTE and TCD. We found four false negative contrast tests with TTE.
Among the 63 patients who had a negative contrast test with TEE and TTE, the results were the same with TCD for 59 of them; we were not able to determine a cause for the four positive tests.
Conclusion This study confirms that transesophageal echocardiography has limitations in the diagnosis of patent foramen ovale.
In this study, the negative predictive value of transcranial Doppler was excellent. Therefore, this examination is able to exclude a patent foramen ovale with a high level of confidence.
Keywords: Patent foramen ovale; Transthoracic echocardiography; Transcranial Doppler; Transesophageal echocardiography
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