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Hemodynamics optimization during off-pump coronary artery bypass: the 'no compression' technique
Xavier M Mueller1, Pierre-Guy Chassot, Junging Zhou
1Department of Cardio-vascular Surgery, Centre Hospitalier Universitaire Vaudois, CH-1011 Lausanne, Switzerland. xavier.mueller@chuv.hospvd.ch
Insights
The no-compression technique in off-pump coronary artery bypass (OPCAB) surgery maintains stable hemodynamics, even when accessing challenging lateral heart walls. This method avoids cardiac compression, ensuring patient stability during complex procedures.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Hemodynamics
Background:
- Off-pump coronary artery bypass (OPCAB) surgery requires heart manipulation, which can lead to hemodynamic instability, especially when accessing posterior and lateral walls.
- The 'no compression' technique offers an alternative approach, involving heart enucleation without cavity compression and using a suction device for stabilization.
Purpose of the Study:
- To assess the impact of the 'no compression' technique on hemodynamic parameters during OPCAB surgery.
- To evaluate hemodynamic stability during revascularization of posterior, lateral, and anterior heart walls using the no-compression method.
Main Methods:
- A homogeneous group of 26 consecutive patients undergoing triple grafts in a sequential order (posterior, lateral, anterior) was selected.
- Hemodynamic parameters including heart rate (HR), mean pulmonary arterial pressure (PAP), pulmonary capillary wedge pressure (PCWP), mean arterial pressure (MAP), cardiac output index (COI), and central venous saturation (SvO(2)) were continuously monitored.
- A coronary shunt was employed for all anastomoses.
Main Results:
- Heart rate (HR) remained stable throughout the procedure, with no significant variations observed across different wall revascularizations.
- While mean pulmonary arterial pressure (PAP) and pulmonary capillary wedge pressure (PCWP) showed slight increases during lateral wall access, these were not statistically significant.
- Mean arterial pressure (MAP), cardiac output index (COI), and central venous saturation (SvO(2)) experienced their largest decreases during lateral wall exposure, but these changes were also not statistically significant compared to baseline.
Conclusions:
- The 'no compression' technique effectively maintains hemodynamic stability during OPCAB surgery across all analyzed territories.
- While marginal hemodynamic changes were noted during lateral wall revascularization, they did not differ significantly from baseline values.
- This technique ensures stable hemodynamics, particularly beneficial for accessing challenging posterior and lateral heart walls.
Objective:
Heart manipulation during OPCAB may cause hemodynamical instability in particular for access to the posterior and lateral walls. The 'no compression' technique involves enucleation of the heart without any compression on the cavities, and stabilization of the target area with a suction device. The impact of this technique on hemodynamics is assessed.
Methods:
In order to analyze a homogeneous group, 26 consecutive patients with triple grafts, one to each side of the heart in the same sequential order (posterior, lateral and anterior wall successively) were selected. Heart rate (HR), mean pulmonary arterial pressure (PAP, mmHg), pulmonary capillary wedge pressure (PCWP, mmHg), mean arterial pressure (MAP, mmHg), cardiac output index (COI, l/min per m(2)), and central venous saturation (SvO(2),%) were monitored. A coronary shunt was used for all the anastomoses.
Results:
HR was stable with baseline value of 60+/-10 and the highest value for the anterior wall, 63.6+/-8 (P=0.23). PAP and PCWP exhibited their highest increase, when compared with baseline, for the lateral wall, 23.9+/-4.7 vs. 20.7+/-6.2 (P=0.06), and 17.2+/-4.7 vs. 14.9+/-5.6 (P=0.16), respectively. MAP, COI and SvO(2), exhibited their largest drop, when compared with baseline, for the lateral wall too, 73.1+/-9.1 vs. 77.1+/-7.5 (P=0.12), 1.99+/-0.47 vs. 2.26+/-0.55 (P=0.09), and 70.5+/-8.4 vs. 74.8+/-9.3 (P=0.12), respectively.
Conclusions:
None of the hemodynamical parameter differed significantly from baseline value for all three territories. While hemodynamics was perfectly maintained during the posterior and anterior walls revascularization, exposure of the lateral wall led to marginal changes only.