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Cardiovascular Research 1997 34(3):582-589; doi:10.1016/S0008-6363(97)00080-1
© 1997 by European Society of Cardiology
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Copyright © 1997, European Society of Cardiology

Transesophageal multiplane imaging of the human pulmonary artery: a comparison of MRI and multiplane transesophageal two-dimensional echocardiography

Erik Slotha,c,*, Erik Morre Pedersenb,c, Henrik Egebladd, J.Michael Hasenkamb,c and Bent Juhla

aDept. of Anaesthesia, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N., Denmark
bDept. of Cardiothoracic and Vascular Surgery T, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N., Denmark
cInstitute of Experimental Clinical Research, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N., Denmark
dDept. of Cardiology, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N., Denmark

* Corresponding author. Tel. +45 8949 5615, Priv. +45 8617 3918; Fax +45 8949 6014.

Objective: To evaluate the anatomical relationship between the esophagus and pulmonary artery including assessment of the correct transesophageal Doppler insonation angle into the mid-pulmonary artery trunk. Methods: We evaluated the anatomical relationship between the esophagus and pulmonary artery (PA) from comparable magnetic resonance (MR) and transesophageal echocardiographic (TEE) multiple two-dimensional images (0°, 45°, 90° and 135° clockwise rotation of the standard transverse scanning plane when seen from the esophagus) obtained in 10 healthy, young volunteers. Results: The main PA could be visualized with both techniques in all 10 volunteers and provided highly identical images of good quality. A mean insonation angle of 35° (range 26°–46°) for a fictive esophageal Doppler beam into the main PA was disclosed. The PA trunk was short with a mean length of 23.4 mm (range 17–30 mm). Conclusions: These anatomical data contradict the general assumption of alignment of the pulmonary artery and the transesophageal Doppler beam. Angle correction should be applied in the clinical setting using MTEE by rotation of the scanning plane to approximately 45°. Ignoring the insonation angle of approximately 35° may cause 20% underestimation of blood flow velocity and cardiac output in the PA.

KEYWORDS Pulmonary artery; Transesophageal echocardiography; Magnetic resonance imaging; Human


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