[Previous Months][Date Index][Thread Index][Join - Register][Login]
[Message Prev][Message Next][Thread Prev][Thread Next]

[IP] 8. Who Are The Candidates for Continuous Insulin Infusion?



8.  Who Are The Candidates for Continuous Insulin Infusion?
      www.diabetesincontrol.com/issue54/item8F.htm


Item #8.
Who Are The Candidates for Continuous Insulin Infusion?

Almost 25 years ago the an account of a new technique for achieving long 
term
strict blood glucose control in type 1 diabetes appeared in the BMJ. 
Continuous
subcutaneous insulin infusion,1 or insulin pump therapy, mimics 
physiological
delivery by using a portable electromechanical pump to infuse insulin at a 
slow,
basal rate throughout 24 hours, with patient activated boosts when food is
eaten. Developed as a research tool to investigate the impact of greatly
improved glycemic control on diabetic complications, continuous subcutaneous
insulin infusion is now used in everyday treatment by at least 130 000 
people
worldwide, more than 80 000 in the United States alone.

Much of the skepticism about continuous subcutaneous insulin infusion 
derives
from misunderstandings about its effectiveness, safety, and clinical use. 
For
example, it is often thought that continuous subcutaneous insulin infusion 
has
not been rigorously compared with modern multiple insulin injection 
treatment.
At least 14 randomized controlled trials compare continuous infusion with
intensified injection regimens. An analysis of these studies showed that
glycemic control is slightly but significantly better during insulin pump
therapy, with a glycated hemoglobin percentage about 0.5% lower than on
optimized injection regimens.

As to safety, there were initial case reports of hypoglycemic coma, and the
Diabetes Control and Complications Trial reported a high rate of severe
hypoglycemia during continuous subcutaneous insulin infusion (0.54 episodes 
per
patient year). However, other trials have recorded lower rates episodes per
patient year), and most evidence suggests that hypoglycemia is either no 
more
frequent or less common during continuous infusion than on either optimized 
or
non-optimized injection therapy. In two recent trials severe hypoglycemia 
was
84% less and nearly 50% less than on multiple insulin injection therapy.  
Some
studies have found less hypoglycemia with the non-associating monomeric 
lispro
analogue than with regular human insulin as the pump insulin.

The high rates of ketoacidosis on continuous subcutaneous insulin infusion
reported in early studies were probably due to lack of experience; 
unsuitable
pump insulin, with aggregation causing cannula blockage; and the use of less
reliable pumps without alarms. Though the small subcutaneous depot of 
insulin
would seem to put patients receiving a continuous infusion more at risk, 
with
proper pump practice the frequency of ketoacidosis is the same as with 
injection
therapy.

Continuous subcutaneous insulin infusion can also help improve control in
patients who suffer sharply raised blood glucose concentrations before 
breakfast
(the dawn phenomenon).Pumps can be programmed to increase basal infusion 
rates
during the night to counter this dawn rise. There may be other strategies to
cope with the dawn phenomenon, such as moving the evening injection of 
delayed
action insulin from before supper to bedtime or using new long acting 
insulins
(such as glargine) with essentially peakless action profiles, which need 
formal
comparison with continuous subcutaneous insulin infusion.

Even Medicare is now reimbursing for pump therapy for type 1 diabetes. But,
continuous subcutaneous insulin infusion is not indicated in most people 
with
type 1 diabetes, who can achieve good control with intensified insulin 
therapy.
Establishing simple clinical guidelines for using continuous subcutaneous
insulin infusion has promoted its wider availability.

Who are the candidates for an insulin pump?  It might be suggested that a 
trial
of continuous subcutaneous insulin infusion is indicated in patients with 
type 1
diabetes with frequent, unpredictable hypoglycemia or a marked dawn blood
glucose rise, whose poor control persists in spite of optimized insulin
injection therapy (including educational support and attention to blood 
glucose
self monitoring and injection technique). Some patients who lead 
unpredictable
lives with delayed meals experience wide swings in blood glucose 
concentration
and are particularly liable to hypoglycemia when they try to tighten control
with injection therapy. The few pregnant patients with diabetes who fail to
achieve impeccable control with injections should also be considered. All
candidates should be willing to learn about and undertake pump therapy and 
its
associated procedures such as regular blood glucose monitoring; this 
includes
patients well controlled on insulin injections who simply prefer pump 
therapy
and are willing to pay for their pumps and supplies. People with 
psychological
problems and major psychiatric disorders tend not to do well in meeting the
demands of continuous insulin infusion.

For those patients where insulin infusion pump therapy is indicated, it can
substantially improve the quality of their lives and the course and outcome 
of
their diabetes.


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com
----------------------------------------------------------
for HELP or to subscribe/unsubscribe, contact: HELP@insulin-pumpers.org
send a DONATION http://www.Insulin-Pumpers.org/donate.shtml