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OBJECTIVE:
Every year in UK 28 000 CABG procedures are performed with or without CPB. Both techniques have been compared in every possible way specifically in terms of cost-effectiveness.
Based on our experience we have analysed carbon footprint of CABG procedure using off and on pump technique[[Unsupported Character -  ]]
METHODS:
For one month every CABG performed in UHW was monitored in terms of energy used during CPB and production of negative pressure (kWh) for OPCAB. Additionally emission of CO2 by blower mister was monitored. We have also included in our study potential CO2 emissions during production and utilisation of plastic equipment.
RESULTS:
In order to run CPB and intercooler 1.2kWh is needed, which in 1000 operations/year would equal 1 tonne of CO2. In OPCAB technique CO2 footprint in the same number of cases would be 1.2 tonne/year (blower and negative pressure). Additional 1.2 tonne/year was created in order to power CPB as a standby for OPCAB.
During plastic waste utilisation estimated 4.5 tonne of CO2 would be produced for OPCAB and 14.6 tonne/year for conventional CABG (based on weight of plastic equipment).Overall CO2 footprint for OPCAB and CABG were 6.9 and 14.6 tonne/year respectively for 1000 cases
CONCLUSIONS:
7 tonnes of CO2 is equivalent to 7 return flights between London and New York or burning of 70 tonnes of wood.
100 mature trees neutralise 2 tonnes of CO2 per year, therefore every OPCAB and CABG surgeon performing 200 cases per year should at least plant 7 and 14 trees respectively during his lifetime career