Respiratory dialysis: Reduction in dependence on mechanical ventilation by venovenous extracorporeal CO2 removal

Andriy I. Batchinsky, Bryan S. Jordan, Dara Regn, Corina Necsoiu, William J. Federspiel, Michael J. Morris, Leopoldo C. Cancio

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


Objectives: Mechanical ventilation is injurious to the lung. Use of lung-protective strategies may complicate patient management, motivating a search for better lung-replacement approaches. We investigated the ability of a novel extracorporeal venovenous CO2 removal device to reduce minute ventilation while maintaining normocarbia. Design: Prospective animal study. Setting: Government laboratory animal intensive care unit. Subjects: Seven sedated swine. Interventions: Tracheostomy, volume-controlled mechanical ventilation, and 72 hrs of round-the-clock intensive care unit care. A 15-F dual-lumen catheter was inserted in the external jugular vein and connected to the Hemolung, an extracorporeal pump-driven venovenous CO2 removal device. Minute ventilation was reduced, and normocarbia (PaCO2 35-45 mm Hg) maintained. Heparinization was maintained at an activated clotting time of 150-180 secs. Measurements and Main Results: Minute ventilation (L/min), CO2 removal by Hemolung (mL/min), Hemolung blood flow, O2 consumption (mL/min), CO2 production by the lung (mL/min), PaCO2, and plasma-free hemoglobin (g/dL) were measured at baseline (where applicable), 2 hrs after device insertion, and every 6 hrs thereafter. Minute ventilation was reduced from 5.6 L/min at baseline to 2.6 L/min 2 hrs after device insertion and was maintained at 3 L/min until the end of the study. CO2 removal by Hemolung remained steady over 72 hrs, averaging 72 ± 1.2 mL/min at blood flows of 447 ± 5 mL/min. After insertion, O2 consumption did not change; CO2 production by the lung decreased by 50% and stayed at that level (p < .001). As the arterial PCO2 rose or fell, so did CO 2 removal by Hemolung. Plasma-free hemoglobin did not change. Conclusions: Venovenous CO2 removal enabled a 50% reduction in minute ventilation while maintaining normocarbia and may be an effective lung-protective adjunct to mechanical ventilation.

Original languageEnglish
Pages (from-to)1382-1387
Number of pages6
JournalCritical Care Medicine
Issue number6
StatePublished - Jun 2011
Externally publishedYes


  • extracorporeal circulation
  • lung-protective ventilation
  • mechanical ventilation
  • respiratory dialysis
  • swine


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