endocrine Flashcards
(151 cards)
A complex metabolic disorder characterized by abnormally increased
blood glucose concentration caused by resistance to action of insulin,
insufficient secretion of insulin, or both.
diabetes mellitus
LT damage of diabets
failure of different organs including the eyes, kidneys, nervous
system, heart and blood vessels
An anabolic hormone secreted by the Beta cells of the Islets of Langerhans
in the pancreas
insulin
function of insulins
regulating glucose homeostasis by stimulating glucose
uptake by cells and by suppressing hepatic gluconeogenesis (body makes glucose
Out of other substances)
(+) glycogen synthesis
(+) glucose transport to muscle and adipose
(+) protein synthesis
(+) uptake of amino acids by peripheral tissues
(+) transport of Triglycerides(TG) to adipose tissue
(+) fat synthesis (lipogenesis)
what does insulin impair?
-) glycogenolysis (break down of glycogen in liver)
(-) gluconeogenesis (inhibits glucose prod)
(-) hepatic glucose production
(-) lipolysis
A 29 amino acid polypeptide hormone secreted from the Alpha cells of the
Islets of Langerhans that is stimulated by hypoglycemia
glucagon (raises blood sugar) while insulin lowers blood sugar
threshold for DM with fBG
> 126
threshold for DM with random BG test
Hgb A1C level for dx of DM
> 6.5%
what’s an OGTT test? what’s the threshold for DM?
Oral Glucose Tolerance Test (OGTT)
2-hr plasma glucose following 75 g OGTT (measure BG at 0,1, and 2 hrs)
Diagnostic 200 mg/dL
prediabets dx
FPG 100-125 mg/dL (=impaired fasting glucose IFG0
random glucose 140-199
OGTT 140-199m((impaired glucose tolerance (IGT) ))
AIC 5.7-6.4%
Reflects average level of hyperglycemia over prior 2-3 months.
Hgb A1c
hgb a1c normal level, pre diabetic level, diabetic level
6.5%
hgbA1c goal for diabetics; what plasma glucose level does it correlate with?
what criteria make a woman high risk and she should be tested early for gestational DM? (ACOG)
~Obesity
~Personal history of GDM or previous macrosomic infant
~Family history of diabetes in a first degree relative
~Polycystic ovarian disease (PCOS)
Ethnicity: AA, pacific islander, hispanic
Age: >35
)
normal region for a woman to be tested for gestational diabetes (ACOG AND ADA)
24-28 weeks
FPG in pregnancy that is GDM (according to ADA)
FPG >92, if >125, diagnosis with full blown DM
gene that is associated with huge increased risk ofDM i
HLA dr3/dr4
factors causig DM I
complex genetics (but identical twins only have 30% risk), AI, environmental (viruses? chemicals? infant feeding?)
pathophys of DM i
Multiple autoimmune mechanisms
Insulitis (infiltration of islets with lymphocytes)
Islet cell antibodies (GAD, ICA, IAA)
~90% loss of b-cell function clinical disease
SX OF dm type ii
Polydipsia, polyuria, polyphagia, wt loss
RFs for DMii
Obesity (BMI > 30) Genetic predisposition FH type 2 Metabolic Syndrome (abd obesity, low HDL, etc) Race/Ethnicity (esp native american, pacific islander, AA, hispanic GDM / child > 9 lbs Mother GDM, DM SGA infants (small gestational age)
differences between type I and II
I has AI component, type II more common among 1st degree relatives, type II more likely obese, type II often asymptomatic and have comorbidities
lab tests to distinguish type I and II
AI ab: GAD 65 most common (Glutamic acid decarboxylase (GAD) antibodies
)