Klin Farmakol Farm. 2003;17(3):139-144

Model for evaluation of data from oral glucose tolerance test

Ladislav Dedík1, Mária urišová2, Adela Penesová3
1 Faculty of Mechanical Engineering, Slovak University of Technology, Bratislava
2 Institute of Experimental Pharmacology, Slovak Academy of Science, Bratislava
3 Institute of Experimental Endocrinology, Slovak Academy of Science, Bratislava

In the present study, an Oral Glucose Tolerance Test (OGTT) was performed in healthy volunteers. Subsequently, on the basis of measured data, a mathematical model was developed, capable to account for the effect of the gastric-emptying process on glycemia in OGTT. The model performance is exemplified by results of model fits to the measured glucose concentration-time profiles in plasma of the volunteers. The modeling results revealed that the volunteers could be divided into three groups: The volunteers of the first group which exhibited high values of the apparent clearance of glucose, i. e. 0.63±0.08 l/min (arithmetic meanstandard deviation), and two glucose fractions sequentially disposable for absorption. The volunteers of the second group which exhibited medium values of the apparent clearance of glucose, i.e. 0.28±0.18 l/min, and three glucose fractions sequentially disposable for absorption. Finally, the volunteers of the third group which exhibited low values of the apparent clearance of glucose, i. e. 0.06±0.02 l/min, and three glucose fractions sequentially disposable for absorption. In the first group, the first and second fraction of glucose disposable for absorption ranged 47.8-98.8 and 1.2-52.2% of the glucose dose, respectively. In the second group, the first, second, and third fraction of glucose fraction disposable for absorption ranged 6.1-70.4, 22.4-76.0, and 3.0-70.1 % of the glucose dose, respectively. In the third group, the first, second, and third fraction of glucose fraction disposable for absorption ranged 20.5-95.6, 3.9-51.6, and 0.5-31.9% of the glucose dose, respectively.

Keywords: OGTT, gastric emptying, model, time delay, system approach.

Published: December 31, 2003  Show citation

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Dedík L, urišová M, Penesová A. Model for evaluation of data from oral glucose tolerance test. Klin Farmakol Farm. 2003;17(3):139-144.

In the present study, a frequently sampled Oral Glucose Tolerance Test (OGTT) was performed in healthy volunteers. Subsequently, on the basis of measured data, a mathematical model was developed, capable to account for the effect of the gastric-emptying process on glycemia in OGTT. The model performance is exemplified by results of model fits to the measured glucose concentration-time profiles in plasma of the volunteers. The modeling results revealed that the volunteers could be divided into three groups: The volunteers of the first group which exhibited high values of the apparent clearance of glucose, i. e. 0.63±0.08 l/min (arithmetic mean ± standard deviation), and two glucose fractions sequentially disposable for absorption. The volunteers of the second group which exhibited medium values of the apparent clearance of glucose, i. e. 0.28±0.18 l/min, and three glucose fractions sequentially disposable for absorption. Finally, the volunteers of the third group which exhibited low values of the apparent clearance of glucose, i. e. 0.06±0.02 l/min, and three glucose fractions sequentially disposable for absorption. In the first group, the first and second fraction of glucose disposable for absorption ranged 47.8-98.8 and 1.2-52.2% of the glucose dose, respectively. In the second group, the first, second, and third fraction of glucose fraction disposable for absorption ranged 6.1-70.4, 22.4-76.0, and 3.0-70.1 % of the glucose dose, respectively. In the third group, the first, second, and third fraction of glucose fraction disposable for absorption ranged 20.5-95.6, 3.9-51.6, and 0.5-31.9% of the glucose dose, respectively.

Model Pre vyhodnotenie dát získaných v or8lnom glukózovom teste

V práci bol vykonaný často vzorkovaný orálny glukózový test (OGTT) u zdravých dobrovoľníkov. Následne na základe nameraných dát bol vyvinutý matematický model, ktorý umožňuje vystihnúť vplyv procesu gastrického vyprázdňovania na glykémiu v OGTT. Funkčnosť modelu je ukázaná na príkladoch znázorňujúcich ako model umožnil získať aproximácie nameraných koncentračných profilov glukózy v plazme u dobrovoľníkov. Z výsledkov modelovania vyplýva že dobrovoľníkov bolo možné rozdeliť do troch skupín: Dobrovoľníci prvej skupiny vykazovali vysoké hodnoty zdanlivej clearance glukózy, t. j. 0,63±0,08 l/min (aritmetický priemer ± štandardná odchylka), a dve frakcie glukózy ktoré boli postupne k dispozícii pre absorpciu. Dobrovoľníci druhej skupiny vykazovali stredné hodnoty zdanlivej clearance glukózy, t. j. 0,28±0,18 l/min, a tri frakcie glukózy ktoré boli postupne k dispozícii pre absorpciu. Dobrovoľníci tretej skupiny vykazovali nízke hodnoty zdanlivej clearance glukózy, t. j. 0,06±0,02 l/min, a tri frakcie glukózy ktoré boli postupne k dispozícii pre absorpciu. V prvej skupine dobrovoľníkov, prvá frakcia glukózy ktorá bola k dispozícii pre absorpciu bola v rozsahu 47,8-98,8 a druhá frakcia v rozsahu 1,2-52,2 % dávky glukózy. V druhej skupine dobrovoľníkov, prvá frakcia glukózy ktorá bola k dispozícii pre absorpciu bola v rozsahu 6,1-70,4, druhá 22,4-76,0 a tretia 3,0-70,1 % dávky glukózy. V tretej skupine dobrovoľníkov, prvá frakcia glukózy ktorá bola k dispozícii pre absorpciu bola v rozsahu 20,5-95,6, druhá 3,9-51,6 a tretia 0,5-31,9 % dávky glukózy.

Kľúčové slová

OGTT, gastrické vyprázdňovanie, model, časové oneskorenie, systémový prístup.

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References

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