Patient was having exercise stress test.After 12:02 minutes the stop button was accidentally deployed on patient's left grab bar as rn was taking bp while patient was walking on tm (tread mill).The left grab bar has an automatic stop button in addition to a pull cord from underneath the bar.This caused treadmill to suddenly stop which did not cause patient harm.This caused the treatment portion of the test to be reordered and restarted.This design appears to be a poor design when staff approach patient from the patient's left side.Clinical engineering staff attached a plastic button cover with velcro to prevent the automatic stop button from accidentally being pushed while nurses are attending to the patient.Manufacturer response for treadmill, ge t2100 model treatmill (per site reporter).Ge medical customer service notified of equipment event.Complaint ref #(b)(4).I was contacted by ge tech support at (b)(6), extension (b)(6).No intervention planned.I asked that our concerns be shared with ge development team for new treadmill models in an effort to increase patient safety.
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