Simplified evaluation and documentation of data from glucose controlled insulin infusion systems--artefact handling

A computerized method for artefact handling, which occurs during recording and evaluation of data from glucose controlled insulin infusion systems (GCIIS) is demonstrated: Recording phase: "Interrupt"-Mode: Restoring of the original linear data-time relation is achieved by using an additional time channel. Analogous treatment of time- and parameter files allows correct correlation. "Communication I/O error": An error-handling subroutine prevents break of program caused by lead characters which occur during restarting the GCIIS thereby disturbing GCIIS-microcomputer communication. Risk of data loss caused by breakdown of electric current is minimized by an appropriate interaction between intermediate store and floppy disk for data transfer. Evaluation phase: Implausible data: Obstruction of double lumen catheter as well as loss of glucose sensor sensitivity result in inappropriate data with consecutive incorrect computation of glycemic indices such as MAGE and M-value. Zero-values: During "HOLD"-mode, all blood glucose values are set to zero by the GCIIS causing forbidden arithmetic operations. These artefact periods are marked in the prepared time-file, deleted and interpolated subsequently. In conclusion, our method permits automatic artefact handling during the recording phase and complete correct data processing during the evaluation phase.