An ecmo circuit change was initiated for a high plasma free hemoglobin.The new pump had a -37 servo pressure which was where the patient had been.The patient became hypotensive and ecmo flows were increased and servo pressure remained -37.The venous line was also clamped with no change in servo pressure.A pressure transducer was added to the venous side of the bridge that measured -25 and responded appropriately to increase and decrease in flows.The alarm was set for -30 while trouble shooting.Consult with leaders and maquet representative.The circuit was changed again without further issue related to the cardiohelp.
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