(Circulation. 1995;91:1782-1789.)
© 1995 American Heart Association, Inc.
Articles |
Characterization of Right Ventricular Diastolic Performance After Complete Repair of Tetralogy of Fallot
Restrictive Physiology Predicts Slow Postoperative Recovery
Presented in part at the 65th Scientific Sessions of the American Heart Association, New Orleans, La, November 1992.
From the Royal Brompton Hospital and The National Heart and Lung Institute, London, UK.
Correspondence to Dr Andrew Redington, Royal Brompton Hospital and The National Heart and Lung Institute, Sydney Street, London 5W3 6NP, UK.
Background Prolonged postoperative recovery caused by a low cardiac output state occurs in some patients after complete repair of tetralogy of Fallot. Biventricular systolic function is usually well preserved in these patients. The contribution of impaired diastolic function, particularly of the right ventricle, has not been studied in detail; therefore, we performed a prospective study of right ventricular diastolic function in this patient group.
Methods and Results We studied biventricular systolic and diastolic function using Doppler echocardiographic examination. Tricuspid valve, superior vena caval, pulmonary arterial, and mitral valve Doppler spectrals were obtained during the first postoperative day in 35 patients aged 6 months to 45 years who underwent complete repair of tetralogy of Fallot. Biventricular systolic function was grossly normal in all patients. Isolated restrictive right ventricular physiology characterized by pulmonary arterial antegrade flow coincident with atrial systole and associated with prominent retrograde superior vena caval flow was seen in 17 of the 35 patients (group 1). This flow was augmented during the expiratory phase of positive pressure ventilation and abolished or greatly diminished during the inspiratory phase (P<.001). An increase in the duration of pulmonary regurgitation occurred during the inspiratory phase of positive pressure ventilation in these patients (P<.01). All patients with right ventricular restriction had a clinical picture compatible with a low cardiac output state, requiring prolonged stays in intensive care and the hospital. Clinical improvement was mirrored by resolution of the Doppler markers of right ventricular restriction in most of the patients.
Conclusions Isolated right ventricular restriction is characterized by antegrade diastolic pulmonary arterial flow on Doppler echocardiography and is responsible for the slower postoperative course and clinical evidence of low cardiac output state in some patients after complete repair of tetralogy of Fallot.
Key Words: tetralogy of Fallot • echocardiography • ventricles • physiology
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