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Efficacy of Emergency Bypass System on hemodynamic instability during off-pump coronary artery bypass: propensity matched analysis


Hemodynamic instability during off-pump coronary artery bypass (OPCAB) is usually solved by intra-aortic balloon pump or on-pump conversion.


We tried to evaluate the usefulness of Emergency Bypass System (EBS)-supported beating heart coronary artery bypass (EBS-CAB).


We retrospectively reviewed medical records of 398 consecutive patients who underwent isolated elective OPCAB with intention-to-treat base from July 2005 to March 2015. 365 patients underwent successful OPCAB, whereas 24 patients were converted to EBS-CAB due to hemodynamic instability. The early and late clinical outcomes were analyzed and then propensity matched analysis was performed to minimize selection bias (39 patients from OPCAB group versus 20 patients from EBS-CAB group).


Mean age was 65.8 ± 9.7 years in OPCAB group and 71.7 ± 7.1 years in EBS-CAB group (p = 0.001). Preoperatively, incidence of hypertension, diabetes, stroke, renal failure, left ventricular dysfunction, and myocardial infarction was similar in two groups. However, Euroscore was significantly lower in OPCAB group (3.2 ± 2.4 vs 5.1 ± 2.4, p = 0.001). Postoperatively, both groups showed similar incidence of complications such as stroke, atrial fibrillation, mediastinitis and bleeding. Operative mortality and survival rate was not different on Kaplan-Meier analysis (Figure 1). Also, propensity-matched analysis showed similar results.


Patients who underwent EBS-CAB had similar postoperative outcomes compared with OPCAB despite of intraoperative hemodynamic derangement. EBS-CAB can be valuable option to minimize the operative risk when patients had unstable vital sign during OPCAB.

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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

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Lim, C., Park, H.O., Kim, J.h. et al. Efficacy of Emergency Bypass System on hemodynamic instability during off-pump coronary artery bypass: propensity matched analysis. J Cardiothorac Surg 10 (Suppl 1), A39 (2015).

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