T2DM Flashcards

1
Q

What is T2DM?

A

A combination of insulin resistance and beta cell failure resulting in hyperglycaemia

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2
Q

Which groups of people does T2DM have a high prevalence in?

A

Ethnic groups that are moving from a rural to an urban lifestyle (South and East Asia)

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3
Q

What are the three measurements used for glucose levels in assessing T2DM?

A

Fasting Glucose, 2-Hour Oral Glucose Tolerance Test (OGTT), HbA1c

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4
Q

Name the values/terms for fasting glucose at a normal, intermediate and T2DM stage

A

Fasting Glucose - <6.1 mmol/L /
Impaired Fasting Glycaemia / >7 mmol/L

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5
Q

Name the values/terms for OGTT at a normal, intermediate and T2DM stage

A

Normal <7.7mmol/L ,
Intermediate - Impaired glucose tolerance , >11mmol/L

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6
Q

Name the values/terms for HbA1c at a normal, intermediate and T2DM stage

A

Normal - <42mmol/mol .
Intermediate - Pre-diabetes , >48mmol/mol

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7
Q

What is the type of insulin deficiency in T2DM called?

A

Relative insulin deficiency - not enough insulin production to overcome resistance
however usually enough insulin to prevent formation of ketones

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8
Q

How does T2DM cause its effects on glucose secretion & absorption?

A

Insulin resistance and beta cell dysfunction lead to proinflammatory visceral fat, leading to decreased glucose uptake by adipocytes & skeletal muscle and increased hepatic glucose production

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9
Q

Howcan T2DM eventually lead to DKA

A

Long term diabetes causing insulin production to become completely compromised - insulin dependent
glucose toxicity to the pancreas can cause acute illness

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10
Q

What is a hyperglycaemic clamp?

A

A test of measuring insulin sensitivity and secretion by increasing glucose dose

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11
Q

How does T2DM affect the prandial peak of insulin release?

A

first phase insulin release is lost, very small peak

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12
Q

What happens to hepatic glucose production in T2DM and why?

A

Reduction in insulin action and an increase in glucagon action - increases HGO

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13
Q

How does T2DM lead to glucose toxicity

A

Glucose insufficiently removed due to low insulin levels
Formation of glucose via the action of glucagon on the liver

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14
Q

How does the relationship between insulin secretion and insulin sensitivity present in a control?

A

If you have a higher sensitivity of insulin, you will not secrete much insulin. This is an exponential relationship (even at extremely high sensitivity you still need a basal insulin level similar to others)

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15
Q

How does the relationship between insulin secretion and insulin sensitivity change in a person with T2DM?

A

Reduced insulin sensitivity, however insulin secretion is not at the high level it should be - described as ‘falling off the curve’

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16
Q

Consequences of insulin resistance

A

Glucagon increased -> HGO increase
insulin dependent muscle glucose uptake is depleted
Adipocytes prod more NEFA causing triglyceride levels to increase

17
Q

Monogenic diabetes

A

single gene mutation - MODY
born with it

18
Q

Polygenic diabetes

A

T1DM/T2DM
polymorphisms increase the risk of diabetes

19
Q

Associations with T2DM

A

Obesity - especially visceral fat
Intrauterine environment - being the offspring of a woman with gestational diabetes,
growth retardation, low body weight increases action of fat prod genes

20
Q

What are 7 presentations of T2DM?

A

Hyperglycaemia,
Overweight,
Dyslipidaemia,
Fewer osmotic symptoms,
Complications of T2DM,
Insulin Resistance,
Later Insulin Deficiency

21
Q

What are 6 risk factors of developing T2DM?

A

Age, BMI, Ethnicity, PCOS, Genetics, Inactivity

22
Q

What is the first line screening test for T2DM, how many readings do you need, and why is this chosen?

A

HbA1c, need two tests of HbA1c > 48 if asymptomatic,
one test if symptomatic
more convenient to take blood supply in clinic than to do a fasting glucose test

23
Q

What is the glycaemic state often correlated with renal failure?

A

Hyperosmolar Hyperglycaemic State

24
Q

Hyperosmolar Hyperglycaemic State

A

Insufficient insulin for prevention of hyperglycemia, but sufficient to prevent lipolysis and ketogenesis
osmotic diuresis causes serious dehydration
Can also be caused by MI, infection

25
Q

Management of T1DM

A

Exogenous insulin
self monitoring glucose
education

26
Q

Management of T2DM

A

diet
oral meds
education
remission/reversal - drastic diet (800 calories daily) or gastric bypass surgery

27
Q

What are the 5 parts of assessment in T2DM consultations?

A

Weight, BP, glucose, Cholesterol, Complications (feet, retina)

28
Q

Drug to reduce HGO

A

metformin

29
Q

Drug that improves insulin sensitivity

A

Metformin and pioglitazone

30
Q

Drug that boosts insulin secretion

A

Sulphonylureas
DPP-4 inhibitors
GLP1 agonists

31
Q

Drug that inhibits glucose reabsorption

A

SGLT-2 inhibitor

32
Q

Metformin

A

First line if dietary/lifestyle changes haven’t worked
Reduces insulin resistance causing an increase in HGO
GI side effects
contraindicated in severe liver, cardiac, renal failure

33
Q

Sulphonylureas

A

Boost insulin secreting capability of b cells
bind to ATP sensitive K+ channel and close it

34
Q

Pioglitazone

A

Insulin sensitizer
causes peripheral weight gain
side effects bladder cancer, heart failure

35
Q

GLP-1

A

gut hormone
stimulates insulin and suppresses glucagon
increases satiety
short half life due to degradation by DPP4

36
Q

Incretin effect

A

Oral glucose causes greater insulin production than IV glucose

37
Q

DPP-4 inhibitors
dipeptidyl peptidase-4

A

increase half life of exogenous GLP1
decrease glucagon/glucose
no effect on weight

38
Q

SGLT inhibitors

A

Inhibits Na-GLu transporter -> more glycosuria
weight loss, lower hba1c
lowers mortality
improves CKD