SOC 2 & 4: Classification/Dx & medical evaluation Flashcards
What is T1DM?
Autoimmune destruction of pancreatic B cells –>absolute insulin deficiency
What is T2DM?
Progressive loss of pancreatic B-cell insulin secretion usually on background of insulin resistance
What are the specifications for A1c to be able to be used for dx?
NGSP certified
In what individuals/dz states should A1c NOT be used?
conditions associated w/ RBC turnover:
- G6PD deficiency
- sickle cell dz
- HIV
- hemodialysis
- 2nd/3rd trimester pregnancy
- ESRD
- blood loss/transfusion
- erythropoietin therapy
How to verify dx of DM
- 2 abnormal tests- can be same sample or different day
When is confirmation of DM not necessary?
BG >200 with s/s of hyperglycemic crisis
What to do if pt is near margin of DM dx?
- re-test in 3-6 months
- tell them s/s to look out for
What % of total DM is T1D?
10%
What % of T1D present w/ DKA
1/3
Those w/ T1D are at risk for what other autoimmune dz?
- vitiligo
- myathenia gravis
- autoimmune hepatitis
- celiac dx
- addison’s dz
- grave’s dz
- hashimoto thyroiditis
- pernicious anemia
What is the average age for T1D dx?
10-14
Those w/ T1DM are insulin ______
sensitive
Typical insulin needs in T1D
0.5-1 g/kg/day
How can T1D be distinguished from T2D?
- C-peptide test
- Presence or absence of autoantibodies
S/s of DM
polyuria polydyspia polyphagia frequent urination, new bedwetting unexplained weight loss Dehydration
What are the most common autoantibodies in T1DM?
GAD glutamic acid decarboxylase
IAA insulin autoantibody
ICA islet cell cytoplasmic autoantibody
What did the TEDDY trial establish?
About 20% of kids <3 years old with 1 autoantibody later developed T1
What is insulin resistance?
Muscle, fat, liver cells are not responding well to insulin, so pancreas makes more insulin. eventually pancreas can’t keep up and glucose isn’t entering cells, blood sugar rises causing hyperglycemia
What is insulin deficiency
insulin producing B-cells are damaged or destroyed and stop producing insulin
What meds may be associated w/ DKA in T2DM
atypical antipsychotics
SGLT2-i
corticosteroids
When should an overweight or obese adult be tested for pre-DM or DM?
- if BMI >23 if Asian or >25 otherwise with 1 or more risk factor:
- 1st degree family member w/ T2DM
- high risk ethnic group (AA x 2, Native American, Pacific Islander, Latino)
- Physical inactivity
- HTN or HTN meds
- CVD hx
- HDL <35 or TG >250
- PCOS
- ancanthosis nigricans or severe obesity
When should women w/ prior GDM be tested for pre-DM/DM?
- 4-12 weeks PP
- if normal, every 3 years
How often should those w/ pre-DM, IFG, or IGT be tested?
Yearly
When should A1c testing start for all even if not overweight/obese?
Age 45
What % of people w/ DM in US are undx? What groups are chronically underdx?
25%; 50% of Asian Americans and Hispanic Americans
What is the appropriate interval b/w screens?
q 3 years
Why is community screening not recommended?
- likely to get people already dx or at low risk
- if someone is + may not have access to follow-up care
What is the ominous octet for t2DM?
- 80% loss of amylin at dx –>low satiety
- increased renal reabsorption
- decreased gut hormones GLP-1 and GIP
- increased lipolysis (free FA in blood –> insulin resistance)
- muscle insulin resistance
- liver insulin resistance
- increased alpa cell secretion of glucagon
Factors associated w/ insulin resistance
- abdominal obesity
- OSA
- fatty liver
- CA
- acanthosis nigricans
- sedentary lifestyle
- genetics
- history of GDM
- PCOS
What is acanthosis nigricans?
dark, velvety patches of skin where skin rubs together (neck, underarm, elbows)
- signals high insulin in blood
- skin tags or dark areas around nose/eyes
What is LADA?
When is it typically dx?
Latent Autoimmune Diabetes in Adults
>35 years old
What medical tx of LADA is appropriate?
start insulin w/ in 6 months; early insulin associated w/ preserved pancreatic ability to produce insulin
How/when to test for LADA
- GAD
- If there is:
- absence of metabolic dz (no HTN, no HLD, no obesity)
- no improvement w/ oral hypo agents
- other autoimmune dz
CF associated DM- how to test, when to test, prevalence, when to be concerned with complications
- OGTT
- Starting @ age 10, yearly
- 20% of kids, 40-50% adults
- assess for complications annually starting 5 years after dx