Depletion of neutrophils by filter during aortocoronary bypass surgery transiently improves postoperative cardiorespiratory status.
Johnson D, Thomson D, Mycyk T, Burbridge B, Mayers I.
Department of Anesthesia, University of Saskatchewan, Saskatoon, Canada.
STUDY OBJECTIVE: To determine whether inclusion of a leukocyte specific filter into the extracorporeal circuit during aortocoronary bypass surgery alters postoperative cardiopulmonary function. DESIGN: Randomized, double-blinded control trial. SETTING: Tertiary care hospital. PATIENTS: Convenience sampling of patients undergoing elective aortocoronary bypass between October 1992 and June 1993. INTERVENTIONS: A total of 32 patients were randomized to a leukocyte specific filter (n = 16) or to a standard blood filter (n = 16) during the surgical procedure. MEASUREMENTS AND RESULTS: White blood cell count in the standard filter group (12.2 +/- 3.6 10(9)/L) was higher (p = 0.047) than in the leukocyte filter group (9.9 +/- 2.6 10(9)/L) at 4 h postoperatively but counts were similar (p = 0.063) at 24 h (10.8 +/- 2.7 vs 8.9 +/- 2.6 10(9)/L, respectively). Leukocyte activation assessed by chemiluminescence was similar between groups at all measurement periods. We noted transient improvements (p < 0.05) in intrapulmonary shunt (19 +/- 50% vs 24 +/- 9%) and mean blood pressure (85 +/- 8 vs 76 +/- 9 mm Hg, respectively) in the leukocyte filter group compared with the standard filter group, respectively. Otherwise there were no differences noted between groups. CONCLUSIONS: Inclusion of a leukocyte filter during cardiopulmonary bypass caused transient cardiorespiratory improvement that was lost within 24 h and did not offer any significant clinical benefits.
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PMID: 7750315 [PubMed - indexed for MEDLINE]