Type 1 Diabetes Flashcards
What is the definition of T1DM?
absolute insulin deficiency causes persistent hyperglycaema (random plasma glucose >11 mmol/L)
What causes type 1 diabetes?
absolute insulin deficiency usually resulting from autoimmune destruction of insulin-producing beta cell in the pancrea
What is the role of genetics in T1DM?
it is a heritable polygenic disease; increased risk of 6-7% if sibling has it, 1-9% if parent has it
What are thought to be 5 environmental factors associated with type 1 diabetes?
- Diet
- Vitamin D exposure
- Obesity
- Early-life exposure to viruses associated with islet inflammation (e.g. enteroviruses)
- Decreased gut-microbiome diversity
What are 2 ages when the peak incidence of diagnosis of T1DM occurs?
6 months - 5 years and 10-14 years
At what age is the prevalence of T1DM highest?
35-60 years
What are 8 complications to T1DM?
- Microvascular: retinopathy, nephropathy, neuropathy
- Macrovascular: peripheral arterial disease, IHD, cerebrovascular disease
- Metabolic disease: DKA, hypoglycaemia
- Other autoimmune conditions
- Psychological complications e.g. anxiety, depression, diabetes-related emotional distress
- Infections and other skin complications
- Reduced quality of life
- Reduced life expectancy
What are 7 autoimmune conditions which have increased incidence with T1DM?
- Graves’ disease
- Hashimoto’s thyroiditis
- Autoimmune gastritis
- Pernicious anaemia
- Coeliac disease
- Vitiligo
- Addison’s disease
What are 5 examples of psychological complications of T1DM?
- Anxiety
- Depression
- Diabetes-related emotional distress
- Behavioural conduct disorders (children)
- Eating disorders - Diabulimia (omitting insulin to lose weight)
What a specific example of a skin complication of T1DM?
necrobiosis lipoidica - inflammaory condition in which shiny, reddish-brown or yellowish patches develop in skin of people with diabetes
How much does type 1 diabetes reduce life expectancy in the UK?
11-15 years
What are 5 clinical features of type 1 diabetes in adults?
- Ketosis
- Rapid weight loss
- Age of onset <50 years
- BMI < 25
- Person and/or family history of autoimmune disease
What should you do immediately (same day) if T1DM is diagnosed?
refer immediately to diabetes specialist team to confirm the diagnosis and provide immediate care
What are the only 3 situations when C-peptide and/or diabetes specific autoantibody titres are measured to confirm the diagnosis of T1DM?
- If T1DM suspected but clinical presentation includes some atypical features (e.g. >50y, BMI >25, slow evolution of hyperglycaemia)
- T1DM has been diagnosed and treatment started but clinical suspicion that may have monogenic form of diabetes, and one or both tests may guide use of genetic testing
- Classification of diabetes is uncertain and conirming it would have implications for availability of treatment e.g. continuous subcutaneous insulin infusion (CSII or ‘insulin pump’
What are 4 symptoms that should make you suspect T1DM in a child or young person presenting with hyperglycaemia (random plasma glucose >11 mol/L)?
- Polyuria
- Polydipsia
- Weight loss
- Excessive tiredness
What should you do immediately if T1DM is suspecte din a child or young person?
refer immediately to multidisciplinary paediatric diabetes care team with competencies needed to confirm diagnosis and provide immediate care
What are 5 features that should make you suspected type 2 rather than type 1 diabetes in a child or young adult?
- Strong family history of type 2 diabetes
- Obesity
- Black or Asian family origin
- No insulin requirement, or have an insulin requirement of less than 0.5 units/kg body weight/day after the partial remission phase
- Evidence of insulin resistance (e.g. acanthosis nigricans)
What are 3 features that should make you suspect monogenic or mitochondrial diabetes in a child or young person?
- Diabetes in first year of life
- Rarely or never develop ketone bodies in the blood (ketonaemia) during episodes of hyperglycaemia
- Associated features e.g. optic atrophy, retinitis pigmentosa, deafness, or features of another systemic illness or syndrome
What are 12 features that should make you suspicious of DKA?
- finger prick blood glucose >11mmol/L
- increased thirst and urinary frequency
- weight loss
- inability to tolerate fluids
- persistent vomiting and/or diarrhoea
- abdominal pain
- visual disturbance
- lethargy and/or confusion
- fruity smell of acetone on the breath
- acidotic breathing - deep sighing (Kussmaul) respiration
- dehydration, which can be classified as mild, moderate or severe
- shock - from severe dehydration
What defines mild dehydration in DKA?
only just clinically detectable
What defines moderate dehydration in DKA?
dry skin and mucous membranes, reduced skin turgor
What defines severe dehydration in DKA?
sunken eyes and prolonged capillary refill time
What are 3 signs of shock in DKA?
- Tachycardia, poor peripheral perfusion, and (late sign) hypotension
- Lethargy, drowsiness, decreased level of consciousness
- Reduced urine output
What are 5 precipitating factors of DKA to assess for?
- Infection e.g. pneumonia or UTI
- Physiological stress e.g. trauma, surgery
- Non-adherence to insulin treatment regimen or intentional insulin omission to lose weight (diabulimia)
- Other medical conditions (hypothyroidism or pancreatitis)
- Drug treatment (corticosteroids, diuretics, sympathomimetic drugs such as salbutamol)