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Case reports

Carbon dioxide embolism induced right coronary artery ischaemia during off-pump obtuse marginalis artery grafting

^a Department of Anesthesiology and Pain Medicine, and Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, South Korea
^b Department of Thoracic and Cardiovascular Surgery, Yonsei University College of Medicine, Seoul, South Korea

Received 2 April 2009; accepted 29 April 2009.

^_* Corresponding author. Address: Department of Anesthesiology and Pain Medicine, and Anesthesia and Pain Research Institute, Yonsei University College of Medicine, 134 Shinchon-Dong, Seodaemun-Ku, Seoul 120-752, South Korea. Tel.: +82 2 2228 8513; fax: +82 2 364 2951. (Email: ylkwak{at}yuhs.ac).

Although use of carbon dioxide (CO₂) blower has been regarded safe during off-pump coronary bypass surgery (OPCAB), we experienced a case of right coronary artery ischaemia induced by retrograde CO₂ embolism originating from the opened obtuse marginalis artery during OPCAB. The spray pressure can exceed the diastolic pressure, especially during grafting at the lateral or posterior wall when haemodynamic compromise due to mechanical heart displacement is most severe. In this situation, CO₂ blowing at an incompletely slinged coronary arteriotomy site can result in retrograde migration of CO₂ into the ascending aorta causing coronary embolism of the right coronary artery. When signs of ischaemia on the right coronary artery are encountered during grafting of other coronary artery, although CO₂ blower has been used, gas embolism should also be considered as the cause and identified at the mid-oesophageal aortic valve long-axis view. When confirmed, the use of gas blower should immediately be discontinued and coronary perfusion pressure increased while allowing time for the CO₂ to be absorbed. In case of massive embolism, needle aspiration of the gas should also be considered.

Key Words: Gas embolism • Off-pump surgery • Coronary bypass