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Several centers have reported a lower rate of peritonitis among adult patients on continuous cyclic peritoneal dialysis (CCPD) as compared to those undergoing continuous ambulatory peritoneal dialysis (CAPD). Preliminary results of our ongoing prospective randomized study comparing CAPD-Y with CCPD also suggest a lower peritonitis incidence among CCPD-treated patients. To investigate whether the two dialysis regimens could result in differences in local host defense, we studied peritoneal macrophage (PMO) function and effluent opsonic activity in eight patients established on CAPD-Y matched with eight chronic CCPD patients. Since short and long dwell times are inherent to both dialysis modalities, and we previously found that dwell time has an impact on PMO function and effluent opsonic activity, patients were studied after both a short (4 hr) and a long (15 hr) dwell time. In both groups PMO phagocytic capacity increased significantly with dwell time (39 +/- 3.3% at 4 hr vs. 58 +/- 4.2% at 15 hr in CAPD patients, and 40 +/- 3.9 vs. 72 +/- 3.3% in CCPD patients; P less than 0.01), as did PMO peak chemiluminescence response (31 +/- 4.9 vs. 77 +/- 7.2 counts.min-1/10(4) cells in CAPD, and 22 +/- 3.9 vs. 109 +/- 21.2 counts.min-1/10(4) cells in CCPD; P less than 0.01) and effluent opsonic activity (41 +/- 7.6 vs. 73 +/- 5.8% in CAPD and 39 +/- 6.2 vs. 70 +/- 5.9% in CCPD; P less than 0.01). However, no significant difference was found in either variable between CAPD and CCPD patients when dwell times were equal.(ABSTRACT TRUNCATED AT 250 WORDS)
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