Intraop Oliguria

Hey everyone, So what do you guys think about intraop oliguria/anuria? Does it matter? How do you manage it? Had a spine case on an obese gentleman, prone position. He stopped making urine during the case, down to 5cc an hour for a couple hours. Tried fluid boluses to no avail. His BPs and lactate were stable the whole time. Flipped him supine at the end of the case and he started making urine again. Was I just treating a number with the fluid boluses? From what I've read, intubation,... Intraop Oliguria
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