Several studies have evaluated the potential use of continuous glucose monitoring system (CGMS) as hypoglycaemia alarms but so far failed to show reduction in the frequency of severe hypoglycaemia (8;9). Although the technology is continuously being improved it is still associated with a number of problems (10). The technique is rather imprecise, particularly in the lower range of glucose measurements, and only about 33% of hypoglycemic events were detected in a larger clinical trial (11). The accuracy of the reading is reduced when rapid changes in blood glucose occur (12). There is a significant and variable delay from the change in blood glucose to the change in the interstitial compartment ranging from 4 - 10 minutes (13) and the catheters are rather costly and must be replaced every 72 hours.