‘The green blood came as a bit of a shock to Dr. Alana Flexman and her colleagues when they tried to put an arterial line into a patient about to undergo surgery in Vancouver’s St. Paul’s Hospital. [..]
As surgical staff prepared the man for the middle-of-the-night emergency operation, Flexman and a colleague attempted to insert a line into a wrist artery.
Arterial lines are used to monitor blood pressure during an operation; any blood that flows when the line is inserted into the artery should be vivid red, the sign it has been oxygenated in the heart.
But in this case, which occurred in October 2005, it was not.’