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Point-Counterpoint

Glucose Variability

  1. F. John Service
  1. From the Mayo College of Medicine, Mayo Clinic, Rochester, Minnesota
  1. Corresponding author: F. John Service, service.john{at}mayo.edu.
Diabetes 2013 May; 62(5): 1398-1404. https://doi.org/10.2337/db12-1396
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    FIG. 1.

    Continuous BG analysis for 48 h in an ambulatory fed normal subject. The timing and frequency of food ingestion matches that of the type 1 diabetic patient in Fig. 2. Note that each glucose excursion occurs in response to food ingestion and that each limb, ascending and descending, exceeds 1 SD of the 288 data points/24 h taken every 5 min from the 48-h tracing. Note the small difference in SD between days 1 and 2. Mean BG was 84 and 82 mg/dL and MAGE 41 and 48 for days 1 and 2, respectively. M, meal; Sn, snack.

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    FIG. 2.

    Continuous BG analysis for 48 h in a patient with type 1 diabetes. The qualifying excursions are shown as pairs of solid and stippled yellow beginning with the leftmost deflection, 333 to 208 mg/dL. The inflection component of that excursion is 208 to 432 mg/dL, which incorporates an intermediary excursion. The latter fails to qualify as an excursion on its own because one limb (322 to 287 mg/dL) fails to exceed 1 SD for that 24-h period. Note the small difference in SD from day 1 to day 2. Whether MAGE is calculated from the descending (184 mg/dL) or ascending (171 mg/dL) limbs, the values are similar. M, meal; Sn, snack.

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    FIG. 3.

    Frequency distribution of the 576 glucose values/48 h from Fig. 1 plotted per 24-h period showing a lack of normal distribution.

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    FIG. 4.

    CONGA 1 analysis for the breakfast meal day 1 from Fig. 1. For illustration purposes only 4 h are shown. For this period, the mean of hourly differences determined at 5-min intervals is −5.5 mg/dL with an SD of 22.2, which is the actual CONGA value. The insert shows the frequency distribution of the sequential glucose differences, which clearly does not have a normal distribution.

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    FIG. 5.

    The orange line is a stylized representation of the best that can be achieved currently for meal-related glucose control in diabetes. Once therapies become available to bend the postprandial curve to match that of nondiabetic subjects (yellow line), new metrics will be needed. Glucose rise to peak (∆G), time to peak (∆T), and % baseline recovery 1 h after peak (−∆G/∆G) have been used for this purpose (50). Average values for these metrics in normal subjects are ∆G = 40 mg/dL, ∆T = 45 min, and baseline recovery 1 h after peak = 90%.

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Diabetes: 62 (5)

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May 2013, 62(5)
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Glucose Variability
F. John Service
Diabetes May 2013, 62 (5) 1398-1404; DOI: 10.2337/db12-1396

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Glucose Variability
F. John Service
Diabetes May 2013, 62 (5) 1398-1404; DOI: 10.2337/db12-1396
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  • Glucose Variability: Where It Is Important and How to Measure It
  • “Deficiency” of Mitochondria in Muscle Does Not Cause Insulin Resistance
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