A (b)(6) year old female to the hospital for cva and was intubated and required an mri.Went to mri suit where patient was changed over to the mri safe ventilator and circuit.After being placed on mri vent and circuit the patient started to desaturate and coded after approximately 8 minutes.This caused patient to fall outside treatment window.It was reported the ventilator malfunctioned but the ventilator was checked with no issues found.The used circuit was sequestered by risk and biomed found the et adaptor was attached to the circuit tubing backwards.(both ends of the et adaptor piece are approximately the same size and easily fit into circuit tubing either way).The adaptor piece dose have printed on it patient but is difficult to see.This is being turned in as a safety issue with the adaptor piece easily attachable to the circuit tubing.When this piece is hooked up backwards the patients are not able to get any oxygen due to the one way valve.During the investigation the mri tech pulled the circuit that was already connected together.It was discovered during the investigation that some of the circuits require assembly and others are already assembled.Unfortunately the packaging for this event was not saved so no lot numbers available.
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