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Analysis of thoracic aortic blood flow during off-pump coronary artery bypass surgery
Christophe Decoene1, Thomas Modine, Sharif Al-Ruzzeh
1Service d'anesthésie-réanimation cardiologique, Hopital cardiologique, CHRU de Lille, France.
Insights
Thoracic aortic blood flow (TABF) monitoring during off-pump coronary artery bypass (OPCAB) surgery detected significant decreases not reflected by standard hemodynamic monitoring. This finding is vital for improving patient management during OPCAB procedures.
Area of Science:
- Cardiovascular Surgery
- Hemodynamics
- Surgical Monitoring
Background:
- Off-pump coronary artery bypass (OPCAB) surgery requires precise hemodynamic monitoring.
- Non-invasive monitoring of thoracic aortic blood flow (TABF) aids in detecting hemodynamic compromise during OPCAB.
- Early detection of hemodynamic changes is crucial for patient outcomes.
Purpose of the Study:
- To analyze changes in TABF during OPCAB surgery using transesophageal Doppler.
- To compare TABF changes with simultaneous measurements from standard hemodynamic monitoring methods.
- To assess the clinical significance of TABF variations in OPCAB.
Main Methods:
- Compared transesophageal Doppler-derived TABF with cardiac output, pulmonary artery pressures, radial pressures, and mixed venous oxygen saturation.
- Studied 15 consecutive patients undergoing OPCAB surgery.
- Utilized continuous hemodynamic monitoring throughout the surgical procedure.
Main Results:
- TABF significantly decreased during coronary anastomosis construction (P=0.008).
- TABF returned to baseline levels by chest closure.
- Standard hemodynamic monitoring, including cardiac output, showed no significant changes compared to baseline.
Conclusions:
- Significant decreases in TABF during OPCAB surgery may not be detected by conventional hemodynamic monitoring.
- TABF monitoring offers a valuable, sensitive indicator of hemodynamic status during OPCAB.
- Improved monitoring of TABF can enhance patient management and outcomes in OPCAB surgery.
Objectives:
The non-invasive monitoring of thoracic aortic blood flow (TABF) during off-pump coronary artery bypass (OPCAB) surgery is becoming more commonly used and proved to be invaluable in the early detection of haemodynamic compromise due to heart displacement. The aim of this study was to analyze the changes in the TABF during OPCAB using transoesophageal Doppler and compare them with the changes observed by other monitoring methods as cardiac output, invasive pulmonary and radial pressures and mixed venous oxygen saturation.
Methods:
The measurements obtained from classic haemodynamic monitoring methods including the radial artery line and the pulmonary artery catheter with continuous monitoring of the cardiac output and mixed venous blood oxygen saturation were compared to the measurements of TABF obtained from a transoesophageal Doppler probe in 15 consecutive patients who underwent OPCAB surgery.
Results:
The TABF decreased significantly during the construction of coronary anastomoses from 3.42 +/- 0.94 l/min (baseline) to 2.2 +/- 0.8 l/min during the first coronary anastomosis and then to 2.14 +/- 1.12 l/min during the second coronary anastomosis (F=4.29, P=0.008). TABF returned to the baseline values (2.85 +/- 1.19 l/min) at chest closure. The cardiac output measurement showed no significant decrease compared to baseline.
Conclusions:
Low TABF occurred without significant changes in the measurements obtained from classic haemodynamic monitoring methods during OPCAB surgery. This finding could be of vital importance in helping improve the monitoring and consequently the management of patients undergoing OPCAB surgery.
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