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Less invasive coronary artery revascularization with a minimized extracorporeal circulation system: preliminary
Insights
Minimally invasive coronary artery bypass grafting (CABG) using a minimized extracorporeal circuit (Mini-HLM) offers comparable outcomes to off-pump coronary artery bypass (OPCAB). Mini-HLM provides a less invasive alternative, suitable for complex cases.
Area of Science:
- Cardiovascular Surgery
- Minimally Invasive Cardiac Surgery
- Extracorporeal Circulation
Background:
- Conventional extracorporeal circulation (CECC) in coronary artery bypass grafting (CABG) is linked to adverse effects like systemic inflammatory response and hemodynamic instability.
- Modern minimally invasive techniques aim to mitigate these negative side effects.
- This study compares outcomes of coronary revascularization using a minimized extracorporeal circuit (Mini-HLM) versus off-pump coronary artery bypass (OPCAB).
Purpose of the Study:
- To compare the perioperative outcomes of coronary revascularization procedures using either a minimized extracorporeal circuit (Mini-HLM) or an off-pump technique (OPCAB).
- To evaluate the safety and efficacy of Mini-HLM as a less invasive alternative to conventional CABG methods.
Main Methods:
- A prospective, ethics-approved trial involving 120 patients undergoing CABG.
- Patients were randomly assigned to either the off-pump coronary artery bypass (OPCAB) group or the Mini-HLM group.
- Perioperative outcomes, including hemodynamic data, were extensively analyzed and measured at seven time points.
Main Results:
- Operation time was significantly longer for the Mini-HLM group (178.3 min) compared to OPCAB (133.2 min).
- The Mini-HLM group required more grafts (3.11 vs. 1.78).
- No significant differences were observed in perioperative hemodynamics, catecholamine support, hospital/ICU stay, ventilation time, blood loss, transfusion needs, postoperative atrial fibrillation, or neurocognitive disturbances. No deaths or myocardial infarctions occurred in either group.
Conclusions:
- Coronary revascularization with Mini-HLM is a viable and less invasive option, achieving similar benefits to OPCAB.
- Mini-HLM may be advantageous for patients with complex coronary anatomy, offering less demanding revascularization.
- This technique is suitable for routine use and for conversion cases from OPCAB.
Background:
Coronary-artery-bypass-grafting (CABG) with conventional extracorporeal circulation (CECC) is associated with adverse effects such as systemic inflammatory response leading to a decrease in systemic vascular resistance and hemodynamic instability. Modern "less invasive" procedures have been established recently which potentially avoid negative side effects of CECC. The aim of this study was to compare perioperative outcome following coronary revascularization using either a minimized extracorporeal circuit (Mini-HLM) or off-pump technique (OPCAB).
Methods:
In this prospective ethics-approved trial, 120 patients referred for CABG were randomly assigned either to off-pump coronary artery bypass (OPCAB) or to a Mini-HLM procedure. Patient demographics, preoperative characteristics and extensive postoperative outcome were analyzed for both groups. Hemodynamic data were measured at seven time points perioperatively.
Results:
Operation-time was longer in the Mini-HLM group (178,3 ± 32,9 min) compared to OPCAB (133,2 ± 32,7 min, p < 0,001) with higher graft numbers in Mini-HLM group (3,11 ± 0,7 vs. 1,78 ± 0,7, p < 0.001). There were no significant differences in perioperative hemodynamic criteria, catecholaminergic support, hospital (p = 0,534) and intensive care unit stay (p = 0,880), ventilation time (p = 0,113), blood loss (p = 0,570), transfusion requirements, postoperative atrial fibrillation rate (p = 0,706) and neurocognitive disturbance (p = 0,297). No deaths and no myocardial infarctions were observed.
Conclusions:
Coronary revascularisation with Mini-HLM represents a suitable and "less invasive" procedure which achieves all benefits of OPCAB but may allow for less demanding revascularisation than OPCAB in special patients with complex coronary anatomy and can therefore be used both on a routine basis and in all "conversion" cases of OPCAB.
