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Ann Thorac Surg 2002;73:1424-1430
© 2002 The Society of Thoracic Surgeons
a Harefield Hospital, Royal Brompton & Harefield NHS Trust, Harefield, Middlesex, United Kingdom
Accepted for publication December 30, 2001.
* Address reprint requests to Dr George, Department of Anaesthesia, Harefield Hospital, Harefield, Middlesex, UK, UB9 6JH
e-mail: s.george{at}rbh.nthames.nhs.uk
Background. Positioning for access to the coronary arteries leads to hemodynamic instability during off-pump cardiac surgery. External changes have been well described, but a description of the intracardiac structures in humans has not been described.
Methods. With multiplane intraoperative echocardiography, the mitral annulus at end diastole was reconstructed in the different positions and correlated with hemodynamic changes in the right heart and left atrium.
Results. Significant distortion of the mitral annulus with enlargement of the left atrium and pulmonary veins was demonstrated, which correlated with high left atrial pressures.
Conclusions. Mitral valve distortion can significantly contribute to hemodynamic instability during positioning for off-pump cardiac surgery.
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