Hemodynamic Defects Not Corrected By Fontan Operation And The Study Of Improving Measures

Objective 1. To observe the effects of quiet respiration on pulmonaryvenous flow and its regularity, and to verify the new proposal of the mechanism of respiration effects on hemodynamics. Meanwhile, to provide with the experimental base for studying to improve the hemodynamics of postoperative patients of Fontan. 2. To observe the effects of quiet respiration on transmitral and tricuspid Doppler flow and to verify the new hypothesis illustrating the mechanism of respiration effects on hemodynamics, to supply with basis for studying the diastolic function of right ventricle by Doppler echocardiography. Meanwhile, to discuss the feasibility of taking the respiratory variation of intrathoracic pressure as blood pump to substitute the right cardiac function that the postoperative patients of Fontan who have not. 3. To observe the effects of abnormal intrathoracic pressure on pulmonary venous flow, superior vena caval and inferior vena caval flow in normal subjects. To supply with the normal reference for studying the hemodynamics that may occur during daily life of postoperative patients of Fontan. Try to provid experimental and theoretical base for improving the technique of Fontan operation. 4. To observe the effects of...