New Circulator in OR (3 mo). Doing a Hysteroscopy /c Myomectomy the other day and went through (4) 3L bags of glycine. After the first bag, the hysterflo started showing a negative deficit. I didn't know what to make of it, or what caused it. Nothing on google or the manufacturer manual. The Surgeon was very upset postop and the manual calculation from the suction jugs was a learning experience to say the least! Eventually calculated zero deficit. But wow, those were a painfull few minutes /c the surgeon.