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Hypoglycemia as a limitation of treatment of diabetes mellitus
Brož, Jan ; Kvapil, Milan (advisor) ; Češka, Richard (referee) ; Karásek, David (referee)
BROŽ, Jan. Hypoglycemia as a limitation of treatment of diabetes mellitus. Prague, 2022. 100 pages. Dissertation thesis. Charles University in Prague, 2nd Faculty of Medicine, Department of Internal Medicine. Supervisor Kvapil, Milan. In diabetes mellitus, hypoglycaemia is defined as a condition that is associated with abnormally low blood glucose levels (≤ 3.9 mmol/l), which puts the body at potential risk. The first part of the work is devoted to the treatment of hypoglycaemia associated with physical activity in patients with type 1 diabetes mellitus. The results showed that standardized moderate-intensity body movement without pre-agreed preventive measures led to hypoglycaemia in all participants. During exercise, the rate of ABG decline ranged from 0.7 mmol/l to 1.7 mmol/l in 10 minutes. During recovery after ingestion of 20 g of carbohydrates, the rate of increase in ABG ranged from 0.6 mmol/l to 1.9 mmol/l in 10 minutes. The amount of glucose administered resulted in recovery from hypoglycaemia in all study participants and maintained glycemia above this level for an additional rest period of 60 minutes after glucose ingestion. The second part of the work was devoted to comparing the characteristics of the results on the one hand of treatment in the same group of patients with type 2...
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Relationship of oxidative stress to parameters of diabetes control in development of vascular complications.
Pelcl, Tomáš ; Prázný, Martin (advisor) ; Rušavý, Zdeněk (referee) ; Šmahelová, Alena (referee)
The aim of this thesis is to contribute to the clarification of the pathogenesis of chronic complications of diabetes mellitus. The main goal of the research was glycaemic variability, its contribution to the activation of oxidative stress and its possible role in the process of advanced glycation, all beyond the scope of persistent hyperglycaemia itself. Another aim of the work is to contribute to the clarification of a possible relationship between glycaemic variability and vascular complications of diabetes. We were the first to describe the association between the concentrations of reactive aldehydes formed during lipid peroxidation and disorders of skin microvascular reactivity in patients with type 1 diabetes (DM1). Elevated markers of oxidative stress were found in this group, furthermore during the 3 years of follow-up higher plasma antioxidant activity was observed. These findings were not dependent of the method of glucose monitoring and glucose variability, which was lower in a subgroup of patients using real-time continuous glucose monitoring (rt-CGM), compared to a subgroup using conventional glucometers. However, it is clear, that hyperglycaemia alone induces increased oxidative stress in patients with diabetes. Simultaneously we observed the opposite process of oxidative stress...
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Whey-based enteral nutrition and its effect on glycemic variability in intensive care
Jirků, Jitka ; Křížová, Jarmila (advisor) ; Zlatohlávek, Lukáš (referee)
Background: The most patients in intensive care experience hyperglycemia. These may include patients with pre-existing diabetes or stress hyperglycemia as an organism's offense reaction. Our aim is not only to correct this hyperglycemia early by a reserve, but also to prevent acceleration of hyperglycemia above their commended level. In addition to insulin, the correct choice of enteral nutrition can prevent not only hyperglycemia but also glycemic variability, which seems to be a much greater risk for these patients than stable tolerable hyperglycemia. In addition to diabetic-specific formulas, whey-based enteral nutrition can support our pursuit of optimal glycemia, due to its insulinotropic effect and its ability to stimulate incretin release. Much evidence will still be needed to confirm these benefits, but we can already look at whey not only as a source of quality protein, but also as a diet with a potential to limit glycemic variability. Objective: The aim of the study was to evaluate the effect of enteral nutrition based on whey (Peptamen Intense) on parameters associated with the assessment of glycemia in intensive care patients. Assess whether there is a relationship between the variables and draw conclusions with possible application in practice. Methods: Thirty-seven patients were...
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Changes in eye tissues in patients with diabetes mellitus, with emphasis on the tissue surface of the eye
Česká Burdová, Marie ; Mahelková, Gabriela (advisor) ; Kalvodová, Bohdana (referee) ; Kvapil, Milan (referee)
Introduction: Relation of diabetes mellitus (DM) to the diabetic keratopathy and various stages of corneal nerve fiber damage has been well accepted. A possible association between changes in the cornea of diabetic patients and diabetic retinopathy (DR), DM duration, and age at the time of DM diagnosis were evaluated. Neuropathies are among the most common long-term complications of diabetes mellitus. Good glycemic control is essential in prevention of this complication. DM patients with similar mean glucose levels or glycated hemoglobin (HbA1c) levels often exhibit differences in evaluation of diabetic complications. One reason for these differences may be the differences in glucose variability. DM patients with similar mean glucose levels or HbA1c levels often exhibit differences in glucose variability Hypothesis: Diabetes mellitus damages the subbasal nerve fibers of the corneal and affects the density of epithelial, endothelial and stromal cells. Corneal changes in patients with DM are dependent on the degree of diabetic retinopathy (DR), age at diagnosis, duration of DM, and compensation parameters. Purpose: To compare changes in cell density in individual layers of cornea and status of subbasal nerve fibers in patients with type 1 DM (DM 1) and in healthy subjects. To evaluate the dependence...
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Biomarkers in the diagnosis and treatment of diabetic complications
Šoupal, Jan ; Prázný, Martin (advisor) ; Rušavý, Zdeněk (referee) ; Rybka, Jaroslav (referee)
The main objective of this study was research on biomarkers used in both diagnosis and therapy of diabetic complications. The main focus of our work came to be on one of these biomarkers - glycemic variability (GV). High GV is linked with more frequent occurance of hypoglycemia. There are even indications it might contribute to development of diabetic complications. With modern technology - continuous glucose monitoring (CGM), we are now able to reliably describe, calculate and reduce GV. So far it is unclear whether increased GV can contribute to the development of microvascular complications (MVC) in type 1 diabetes (T1D). Studies published so far have assessed GV primarily from routine self-monitoring of blood glucose (SMBG) using glucometers. In the light of this uncertaity, the first part of this work compares GV calculated from CGM with the presence of MVC in T1D patients. GV calculated from CGM, but not from SMBG, proved to be significantly higher in T1D patients with MVC, even though there was no significant difference in glycated hemoglobin (HbA1c). This finding supports the hypothesis that higher GV is related to higher risk of MVC and that HbA1c does not describe diabetes control completely. Moreover, it was shown that GV calculated from SMBG is insufficient. There is still no fully...
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