Ettienne v Chelsea and Westminster Hospital NHS Foundation Trust (22.10.14, Mitting J).
A doctor had not been negligent when he inserted an ulnar artery catheter into a 28 week old baby’s wrist. It was acceptable for him to have adopted the procedure that he knew best. There were real difficulties in inserting a line into the posterior tibial artery. It was a balance of risks and it was essential that her blood gases were accurately and continuously monitored and blood was available to test.