In order to compare the effects of intraperitoneal (IP) versus subcutaneous (SC) insulin delivery on plasma lipoproteins, lipoprotein cholesterol, triglycerides, and very-low-density lipoprotein (VLDL) metabolism were compared in five type I diabetic patients while they were receiving continuous IP insulin (CIPII) or continuous subcutaneous insulin infusion (CSII). Each therapy regimen was of at least 1 month duration, and patients were treated in random order. Mean daily plasma insulin was lower on CIPII compared with CSII. CIPII was associated with lower VLDL triglycerides and VLDL apolipoprotein (apo) B, and higher high-density lipoprotein (HDL) and HDL3 cholesterol. The decreased VLDL on CIPII appeared to be the result of both decreased production and increased clearance of VLDL apo B. The results suggest that the more physiologic route of insulin therapy (CIPII) is associated with lipoprotein profiles of lower atherogenic potential.
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