Evaluation of Hemodynamic Changes of the Left Ventricle Following the Use of Extracorporeal Circulation
- Conditions
- Coronary Surgery
- Interventions
- Device: Pressure/Volume Combination CatheterDevice: Transthoracic echocardiographyDevice: Transesophageal echocardiogram
- Registration Number
- NCT03922178
- Lead Sponsor
- Pierre Wauthy
- Brief Summary
The interpretation of perioperative measures of cardiac function during cardiac surgery is complicated. In particular, the evaluation of the diastolic compliance of the left ventricle. In addition, they are subject to variations induced by post-charge changes caused by the anesthesia, extracorporeal circulation (ECC) and the surgical procedure itself.
Left ventricular failure is frequently measured by alteration of LV contractile properties, and very rarely by alteration of LV compliance. However, both contractility (systolic) and relaxation (diastolic) parameters are important for the left ventricle to perform its function adequately. Left ventricular failure after cardiac surgery with extracorporeal circulation and cardiac arrest under cardioplegia protection is an important and frequently reported complication. The investigator's objectives are to characterize the diastolic hemodynamic mechanisms of this left ventricular failure and to identify predictors of this failure in the postoperative period.
The quantification of the systolic and diastolic functions of the left ventricle by ventricular pressure-volume curves is the technique of reference today, because it allows to determine parameters that are independent of the pre- and post-load conditions. Previous studies using the conductance catheter for the purpose of estimating left ventricular function perioperatively are rare and report conflicting results. In addition, they were mainly intended to measure the systolic function of the left ventricle. Only one reported the diastolic relaxation parameters evaluated by a conductance catheter. This study showed immediately after withdrawal of the extracorporeal circulation a significant alteration of the diastolic relaxation of the left ventricle, but was not interested in its early (kinetic) evolution peroperatively.
The investigator's experience shows that, in the quarter-hour following the weaning of the extracorporeal circulation, a decrease in filling pressures of the left ventricle concomitant with an increase in cardiac output is objectified. These observations are consistent with a significant improvement in left ventricle compliance, but have never been reported.
The objectives of this study are:
* To characterize the left ventricular diastolic failure after withdrawal of the extracorporeal circulation in coronary surgery.
* To identify the kinetics of this early diastolic failure after withdrawal of the extracorporeal circulation.
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 9
- Patient of the CHU Brugmann Hospital receiving elective coronary surgery.
- Patient in sinusal rhythm before the operation and during the collection of hemodynamic data.
- Patients with conserved left ventricular function (based on left ventricular ejection fraction assessed by preoperative echocardiography and superior to 50%)
- Hypertrophic cardiomyopathy (diastolic septal thickness> 15 mm)
- Heart failure with left ventricular ejection fraction <50%
- Presence of cardiac valvulopathy, concerning both right and left atrio-ventricular and ventriculo-arterial valves
- Presence of valvular prosthesis
- Congenital heart disease
- Pregnancy
- Participation to another clinical study
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Elective coronary surgery Transesophageal echocardiogram The study will be conducted at the CHU Brugmann Hospital, with collaboration between cardiac surgery and anesthesiology wards. Subjects referred for elective coronary surgery will be prospectively included during the length of the study. Elective coronary surgery Transthoracic echocardiography The study will be conducted at the CHU Brugmann Hospital, with collaboration between cardiac surgery and anesthesiology wards. Subjects referred for elective coronary surgery will be prospectively included during the length of the study. Elective coronary surgery Pressure/Volume Combination Catheter The study will be conducted at the CHU Brugmann Hospital, with collaboration between cardiac surgery and anesthesiology wards. Subjects referred for elective coronary surgery will be prospectively included during the length of the study.
- Primary Outcome Measures
Name Time Method Tele-systolic volume of the left ventricle 20 minutes after extracorporeal circulation is stopped At the end of systole, the ventricle contains a quantity of blood called 'telesystolic volume'.
Tele-systolic pressure of the left ventricle 20 minutes after extracorporeal circulation is stopped Pressure within the left ventricle after the atrial contraction, at the beginning of the ventricular contraction.
Diastolic pressure of the left ventricle 20 minutes after extracorporeal circulation is stopped The pressure within the left ventricle following the completion of diastolic filling, just prior to systole.
Diastolic volume of the left ventricle 20 minutes after extracorporeal circulation is stopped At the end of diastole, the ventricle contains a quantity of blood called end-diastolic volume.
Ejection volume of the left ventricle 20 minutes after extracorporeal circulation is stopped The ejection volume is the difference between systolic and diastolic volume. It represents the amount of blood ejected at each contraction by the ventricle.
Contractility index of the left ventricle 20 minutes after extracorporeal circulation is stopped Computed by the following formula: (dP/dt max)/P
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (1)
CHU Brugmann
🇧🇪Brussels, Belgium