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Diabetes Technol Ther. 2014 Jun;16(6):348-57. doi: 10.1089/dia.2013.0231. Epub 2014 Jan 28.

Clinical evaluation of an automated artificial pancreas using zone-model predictive control and health monitoring system.

Author information

1
1 Sansum Diabetes Research Institute , Santa Barbara, California.

Abstract

BACKGROUND:

This study was performed to evaluate the safety and efficacy of a fully automated artificial pancreas using zone-model predictive control (zone-MPC) with the health monitoring system (HMS) during unannounced meals and overnight and exercise periods.

SUBJECTS AND METHODS:

A fully automated closed-loop artificial pancreas was evaluated in 12 subjects (eight women, four men) with type 1 diabetes (mean±SD age, 49.4±10.4 years; diabetes duration, 32.7±16.0 years; glycosylated hemoglobin, 7.3±1.2%). The zone-MPC controller used an a priori model that was initialized using the subject's total daily insulin. The controller was designed to keep glucose levels between 80 and 140 mg/dL. A hypoglycemia prediction algorithm, a module of the HMS, was used in conjunction with the zone controller to alert the user to consume carbohydrates if the glucose level was predicted to fall below 70 mg/dL in the next 15 min.

RESULTS:

The average time spent in the 70-180 mg/dL range, measured by the YSI glucose and lactate analyzer (Yellow Springs Instruments, Yellow Springs, OH), was 80% for the entire session, 92% overnight from 12 a.m. to 7 a.m., and 69% and 61% for the 5-h period after dinner and breakfast, respectively. The time spent < 60 mg/dL for the entire session by YSI was 0%, with no safety events. The HMS sent appropriate warnings to prevent hypoglycemia via short and multimedia message services, at an average of 3.8 treatments per subject.

CONCLUSIONS:

The combination of the zone-MPC controller and the HMS hypoglycemia prevention algorithm was able to safely regulate glucose in a tight range with no adverse events despite the challenges of unannounced meals and moderate exercise.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT01472406.

PMID:
24471561
PMCID:
PMC4029139
DOI:
10.1089/dia.2013.0231
[Indexed for MEDLINE]
Free PMC Article

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