Diabetes mellitus
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Transcript of Diabetes mellitus
Diabetes Mellitus
Hamid reza Sadeghi
Shahid Beheshti University of Medical Sciences Saturday, July 11, 2015
Definition
a group of metabolic diseases characterised by elevated levels of glucose in the
blood : - defects in insulin secretion, - insulin action, - insulin receptors or any combination of conditions.
Classification of Diabetes
Type 1 diabetes : - β-cell destruction -“Juvenile Onset”
Type 2 diabetes ( NON-Insulin Dependent ) : -Decreased sensitivity of insulin receptor to insulin -“Adult Onset”
Gestational diabetes : - glucose intolerance
TYPE 1 DM
Due to B-cell destruction.
Require insulin for survival.
Presence of certain autoantibodies. Type 1A – presence of autoantibodies (anti-GAD, IA2, ICAA,
and anti-insulin antibodies). Type 1B – absence of autoantibodies (idiopathic)
Etiology
Genetic factors multiple genes involved : chromosome 6 ,HLA-DR4, HLA-DR3 or both (DR3/4 heterozygote) Environmental factors : - infections : include viruses (rubella, coxsackievirus) B4) -exposure to cow’s milk in infancy - Chemicals and drugs : pyrinuron, Zanosar
Pathophysiology
destruction of beta cell in the pancreas - autoimmune response towards beta cells : CD4+ T helper cells and CD8+ T cells autoantibody-producing B cells and activation of the innate immune system (GAD . ICA)
Prognosis
60% of patients : do not develop serious complications over the long term, 40% of patients : blindness, end-stage renal disease (ESRD) early death ESRD and proliferative retinopathy is twice as high in men as in
women
type2
Most common form of DM
Characterized by disorder in insulin action and insulin secretion or both.
Specific etiology unknown
Insulin resistance
Progressive B-cell failure.
They are obese.
Pathophysiology
insufficient insulin production from beta cells increased glucose production in liver insulin resistance 1- acanthosis nigricans 2- metabolic syndrome 3- polycystic ovary syndrome
Ethiology
Lifestyle obesity and overweight : - leptin - TNFa - IL6 Genetics involve many genes ( unknown) Medical conditions medications : - glucocorticoids -thiazides -beta blockers and statins
Major risk factors
Age ˃45 Obesity Family history History of previous impaired glucose tolerance (IGT) Hypertension (>140/90 mm Hg) or dyslipidemia History of gestational diabetes mellitus pcos (which results in insulin resistance)
Prevention
weight loss exercise Medication : 1- metformin 2- acarbose 3-orlistat
Prognosis
strongly influenced by the degree of control of disease
intensive therapy : decreased risk of microvascular complications
Gestational diabetes
Definition: Hyperglycemia with onset or first recognition during Pregnancy
Risk of developing GDM
Old women (especially for women over 35 years of age)
Previous history of glucose intolerance
A previous pregnancy which resulted in a child with a macrosomia
Diagnostic Criteria
Note: In the absence of unequivocal hyperglycemia, result(s) should be confirmed by repeat testing.
DIAGNOSTIC CRITERIA FOR GDM
Acute complications
Diabetic ketoacidosis (DKA)
Hyperglyceamic hyperosmolar state(HHS)
Chronic Complications
Affects many organ systems.
Vascular : 1-Microvascular 2-Macrovascular
Non vascular: 1-Gastroparesis 2-Sexual dysfunction 3-Skin changes
Management
1-Lifestyle 2-Insulin 3-Pancreas transplantation 4-Islet cell transplantation
Type 21 -Lifestyle2 -Medications3- Surgery
Type 1
Glycemic Recommendations
Blood Pressure and Lipid Goals
Blood pressure <130/80 mmHg
LDL cholesterol
TG
<100 mg/dL
<150 mg/dL
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