Conference on insulin pump therapy in diabetes. Multicenter study of effect on microvascular disease. Origin and design of the Kroc Collaborative Study
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Abstract:
Although the benefits of metabolic intervention on the microvascular complications of diabetes mellitus remain unproven, it is generally assumed though not proven that prognosis in terms of blindness and renal failure will reflect the long-term glycemic response to therapy. Treatment goals however remain poorly defined. Costs and hazards of achieving near-normoglycemia in insulin-dependent diabetes mellitus (IDDM) are major. A multicenter trial was proposed to test the hypothesis that in IDDM two levels of mean glycemia, sufficiently separated to examine the control/complications relationship, could be maintained by the six collaborating centers, using randomized patient allocation to conventional insulin therapy (CIT) and continuous subcutaneous insulin infusion (CSII) as the alternative treatment modalities. Methods of maintaining and monitoring metabolic control and of assessing renal and retinal responses were to be applied, evaluated, and possibly improved. All clinics shared a common experimental protocol, which received ethical approval at each treatment center. Retinal assessment facilities were provided by the Fundus Photograph Reading Center at the University of Wisconsin in Madison, and at the Diabetic Retinopathy Department, Royal Postgraduate Medical School, Hammersmith, United Kingdom. The Central Biochemistry Laboratory was at the University of Newcastle, United Kingdom. Collaborators agreed on policy for recruitment, baseline assessment, and randomization of patients with IDDM, complicated by early microvascular disease. CIT took the form of the unchanged prestudy regimen; glycemic goals were set for CSII and their achievement based on inpatient and outpatient sampling of plasma glucose. Glycosylated hemoglobin was measured, retinal abnormalities recorded photographically, and urinary albumin excretion quantitated at baseline, 4, and 8 mo in all patients.(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
This study investigated if different blood sugar control levels in insulin-dependent diabetes mellitus impact complications. It compared conventional insulin therapy with continuous subcutaneous insulin infusion to assess effects on blindness and kidney failure.
Area of Science:
- Endocrinology
- Nephrology
- Ophthalmology
Background:
- The link between metabolic intervention and microvascular complications in diabetes mellitus is not fully established.
- Prognosis for blindness and renal failure in diabetes is generally assumed to correlate with long-term glycemic control, but this remains unproven.
- Treatment goals for diabetes management are poorly defined, and achieving near-normal glycemia carries significant costs and risks.
Purpose of the Study:
- To test the hypothesis that two distinct levels of mean glycemia can be maintained in patients with insulin-dependent diabetes mellitus (IDDM).
- To examine the relationship between glycemic control and microvascular complications (retinopathy and nephropathy) in IDDM.
- To compare conventional insulin therapy (CIT) with continuous subcutaneous insulin infusion (CSII) in managing IDDM and its complications.
Main Methods:
- A multicenter trial involving randomized patient allocation to CIT and CSII.
- Standardized methods for maintaining and monitoring metabolic control, including plasma glucose sampling.
- Assessment of renal and retinal responses through photographic retinal evaluation and urinary albumin excretion quantitation.
Main Results:
- The study established methods for maintaining and monitoring two separated glycemic control levels in IDDM patients.
- Baseline data on glycosylated hemoglobin, retinal abnormalities, and urinary albumin excretion were collected for all participants.
- The trial protocol ensured ethical approval and standardized procedures across collaborating centers.
Conclusions:
- The study successfully designed a multicenter trial to investigate the impact of glycemic control on microvascular complications in IDDM.
- It laid the groundwork for evaluating the efficacy of different insulin delivery methods (CIT vs. CSII) on long-term diabetes outcomes.
- Further analysis of collected data is needed to establish the relationship between glycemic control and the progression of diabetic retinopathy and nephropathy.