Indwelling arterial catheters are used routinely for continuous haemodynamic monitoring and obtaining repetitive blood samples. The radial artery is the most common site for cannulation. We report a case of forearm ischaemia after radial artery cannulation, which probably went unnoticed for several hours. The ischaemia resulted in an upper arm amputation. The use of a 22 gauge cannula and the use of ultrasound for cannulation may reduce the risk of this complication. We also emphasise the importance of good physical monitoring of patients who are under our care in the intensive care unit.
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