Diabetes Flashcards
what is OGTT?
oral glucose tolerance test
what is normal fasting glucose levels?
4-6mmol/L
what is normal post -prandial adult blood glucose?
<7.8mmol/L
what is normal HbA1c in adults?
<53mmol/L
what do you do if someone has borderline levels?
clinical judgement to decide what is most appropriate for patient
what glucose levels would be deemed as impaired?
5.6-6.9mmol/L
not failed but are failing
what is the majority of the pancreas’ function?
digestive makes up 95%
where is the pancreas in respect to the stomach?
retroperitoneal and lies deep to greater curvature of the stomach
what do the duct cells secrete?
aqueous NaHCo3 solution
what do acinar cells secrete?
digestive enzymes
what two ducts form the main bile duct?
common bile duct and common hepatic duct
why is having 2 hormones important for control of blood glucose?
allow for tighter regulation - insulin and glucagon
how do negative feedback systems work?
if one increases it will work to decrease back to normal?
how does positive feedback mechanisms work?
responses increases deviation
do the Islets of Langherhans equate to a large % of pancreatic mass?
no about 2%
how mnay Islets of Langherhans are there within pancreas?
1.5 million and spread out throughout
what do alpha cells secrete?
glucagon
what cells secrete insulin?
beta cells of pancreas
what secretes somatostatin cells?
delta cells of pancreas
what is the role of somatostatin cells?
inhibit insulin and glucagon
what do epsilon cells do?
increase appetite
what do pancreatic polypeptides do?
promotes GI fluid secretion and feeling full
what is satiety?
feeling of fullness
what is glycogenesis?
glycogen to glucose
what is gluconeogenesis?
using amino acids/ glycerol to make glucose
can you store amino acids well in the body?
not very well
what occurs duirng periods of hyperglycaemia (following meals)?
beta cells are stimulated and they release insulin into blood
insulin triggers glucose absorption into cells
then will be converted into glycogen
what is HbA1c?
test to measure glycation of RBC over past 2-3months
why is HbA1c measuring past 2-3mths?
RBC lifespan is 120 days
what is T1DM aetiology?
genetic, auto-immune mechanisms, can be environmental linked
what is the pathophysiology of T1DM?
pancreas function suddenly declines - no insulin produced
results in hyperglycaemia - hence symptoms
when is common onset of T1DM?
early
10-14yrs for diagnosis
more common in europeans
what are symptoms of T1DM?
weight loss
polydipsia, polyuria, glycosuria
first presentation may be a DKA
what are symptoms of DKA?
dehydration and acidosis
nausea, abdo pain, tachypnoea, tachycardia, acetone breath
what is T2DM aetiology?
higher genetic deposition than T1
lifestyle and exercise
obesity
what is T2DM pathophysiology?
due to prolonged hyperglycaemia, peripheral tissues stop responding to insulin
pancreas works harder to produce more insulin
vicious circle
results in desentisation
less insulin secreted, less receptors
what is HHS or HONK?
hyperosmolar hyperglycaemia state
very high glucose result sin dehydration - water follows glucose that needs to be excreted by urine as no other way
there are no ketones as there is some insulin
what is diabetes insipidus?
not diabetes
lack of ADH - causing polyuria hence got similar name
what tissues get priority for glucose during fasting periods?
glucose -requiring - CNS has a huge glucose need
degradation of liver glycogen first to get glucose
which hormones promote glycogen degradation?
adrenaline and glucagon
which receptor is responsible for bringing in glucose?
GLUT-4 - when insulin binds the transporter is moved to membrane to allow for glucose to be brought in
what is the role of incretins?
released following a meal - stimulates insulin release
makes you feel full, promotes gastric emptying
reduce glucose synthesis
in diabetics what is the lowest BM result you want?
4mmol/L
4 is the floor
at 3mmol/L what symptoms are likely?
mild neurological and cognitive impairment slightly
what lifestyle advice is given to T1DM?
- Health balanced diet – low fat/ sugar. Lots of fibre/ fruit and veg
- Specialist diabetes dietician referral
- Smoking cessation
- Reduce alcohol intake
- Physical exercise – 30mins 5xweek
- Manage weight to healthy BMI
- Regular diabetes check ups: most GP surgeries have a special diabetes clinic – can detect and treat complications. They check HbA1c, cholesterol, BP. Diet/ lifestyle. Eye, urine, foot, sensory and blood tests
how long is the onset on rapid acting insulin?
10-20mins
how long does rapid acting last?
2-3hrs
give examples of rapid acting insulin?
vovorapid
aspira
how long does short acting insulin take to work?
<20mins
what examples of short acting insulin?
actrapid
Humulin S
which insulins are clear suspension?
short acting - no zinc crystals
name some examples of intermediate acting inuslin?
HUmulin I
Insulatard
Insuman basal
how long does intermediate insulin last?
4-12hrs
give some examples of long acting insulin?
Lantas
levemir
abagalar
how long does ultra long analogue insulin last?
steady state after 2-3 days
how can long acting insulin prevent hypos?
basal control in biphasic therapy
prolonged plateau that is fairly stable
how do you prepare cloudy mixtures?
invert 10x to resuspend
what analogue insulin?
more like human
what is soluble insulin?
modified insulin - better absoption
why is basal bolus regime the gold standard?
short acting/ rapid acting at meal times
long acting is during other periods of the day to provide basal control
how does carb counting work?
- Determining dose of insulin from amountof carbs that you eat – more freedom and can not having to restrict as much
in carb counting what is the ration between carbs and insulin?
1:10 insulin to carb
eg for 70g of carbs, you would need 7 units of insulin
what can DAFNE do?
dose adjustment for normal eating
- support group in T1DM
what is the initial dose of starting insulin?
0.2-0.4 units/kg/ day
how many units of insulin is needed for a small meal?
4 units