Continuous Subcutaneous Insulin Infusion

As with any drug or medical device, professional staff and people with diabetes must be aware of the nature of insulin-pump ther-apy and its special requirements and be prepared to manage this therapy. CSII therapy should be provided by a skilled professional team familiar with CSII ther-apy and capable of supporting the patient.

Experi-ence with insulin-pump therapy indi-cates that candidates for CSII must be strongly motivated to improve glucose control and willing to work with their health care provider in assuming sub-stantial responsibility for their day-to-day care. They must also understand and demonstrate use of the insulin pump, self-monitoring of blood glucose, and use of the data so obtained.

In many people, CSII or multiple insulin injections can provide equivalent improvements in control. Whereas some clinicians recommend CSII only when three or four daily injections fail to provide euglycemia, others consider CSII indicated for motivated patients whose daily schedule makes conventional therapy less effective. An insulin pump may provide great lifestyle flexibility, particularly with regard to meal schedules and travel but may be too demanding for some individuals. CSII can help improve metabolic control during pregnancy.

The preferred meal planning approach used with patients on CSII is carbohydrate counting or carbohydrate equivalents.

Factors to be considered in choosing an insulin pump should include safety features, durability, availability of service by the manufacturer, ability of the supplier to provide training, ease of use, clinically desirable features, and cosmetic attractiveness to the user. The nontechnical person may not be able to adequately evaluate the safety and depend-ability of the engineering of a new pump, so prescribers are cautioned to recommend or use pumps with field-proven reliability.

The rapid-acting insulin analog lispro is an appropriate insulin for insulin infusion pumps. The stability of this insulin in both Minimed and Disetronic pumps has been confirmed. Two controlled trials demonstrated improved postprandial glu-cose control with rapid-acting insulin as compared to short-acting insulin (regular) when delivered immediately before a meal by CSII. Lispro is not approved for use in pregnancy.

Pump therapy is as safe as multiple-injection therapy when recom-mended procedures are followed. Poten-tial complications peculiar to pump ther-apy, however, must be explained to users. Undetected interruptions in insulin deliv-ery may result in ketotic episodes more often and more quickly with CSII, which is of particular concern in pregnancy. Infections or inflammation at the needle site may also complicate CSII therapy but can be minimized by careful hygiene and frequent site changes.

Use of CSII requires care by skilled professionals, careful selection of patients, meticulous patient monitoring, and thorough patient education. Insulin pumps prescribed by a physician within these guidelines are a part of treatment and should be covered by the usual payment mechanisms.