DM-1 Flashcards
Defn of Diabetes
hyperglycemia resulting from defects in insulin secretion, insulin action, or both that leads to the failure of various organs
Morbidity of DM
blindless
end-stage renal disease
non-traumatic amputations
Type 1:
percent
cause
age
clinical presentation
body type
treatment
other
percent: 5%
cause: auto-immune
age: children
clinical presentation: acute, life-threatening polydipsia, polyphagia, weight loss, DKA
body type: thin
treatment: insulin
other: predisposed to other types of auto-immune disorders
Type 2:
percent
cause
age
clinical presentation
body type
treatment
other
percent: 95%
cause: lifestyle, insulin resistance, genetic
age: adult >40
clinical presentation: gradual, subtle sx., fatigue, polydipsia, polyuria
body type: overweight/obese
treatment: lifestyle, non-insulin injections, orals, insulin
other: have metabolic syndrome
If a patient has C-peptide what type of DM does it indicate
Type 2
(type 1 has zero)
If a patient has islet cell antibodies what type of DM does it indicate
Type 1
If a patient has antibodies to insulin what type of DM does it indicate
Type 1
Risk factors for T2DM
lifestyle
FH
HTN
Dyslipidemia
gestational DM or giving birth >9 lb baby
Race (Hispanic, Native, AA, Pacific)
Genetic defects in B-Cell function
can resent like type 1 or type 2 (more type 1)
usually insulin dependent
MODY (maturity-onset diabetes of youth)
LADA (latent autoimmune diabetes in adults)
Secondary causes of DM
Pancreatic disease (pancreatitis, cystic fibrosis)
Endocrinopathies (acromegaly, cushings, hyperthyroidism)
Most prevalent drug induced diabetes
steroids
atypical antipsychotics
protease inhibitors
statins
Imparied fasting glucose
> 100 mg/dl but <126 mg/dl
Imparied glucose tolerance
2 hour OGTT >140 mg/dl but <200 mg/dl
HgbA1C between what is pre-diabetes
5.7% and 6.4%
Oral Glucose Tolerance Test (OGTT)
75 gm glucose load
BS check q30 min x 2 hours
level peak at 1 hr, remain below 200 throughout return to fasting at 2 hrs
Diagnosis of DM
symptoms of DM + any glucose >200
Fasting plasma glucose >126
Plasma glucose >200 after 2 hrs of OGTT
HgbA1C >6.5%
Fasting BG range: normal, pre DM, DM
normal: <100
pre DM: 100-126
DM: >126
2hr PP BG range: normal, pre DM, DM
normal: <140
Pre DM: 140-200
DM: >200
A1C range: normal, pre DM, DM
normal: <5.7
Pre DM: <5.7-6.4
DM: >6.4
What stores glucose
adipose tissue
glycogen
triglycerides
How much insulin is secreted a day and how much can your body store
secreted: 25-50 units
store: 200 units
Epi stimulates what
glycogenolysis
Glucocorticosteriods stimulate what
gluconeogenesis
GLP-1 secreted from the small intestine after a meal, increases _________ secretion, inhibits _________ secretion, signals satiety in CNS, and delays gastric emptying
insulin
glucagon
BS normal range and CNS normal range of glucose homeostasis
BS: 70-130
CNS: >40-60
T1DM pre-clinical stage
immune markers are present but no symptoms present (B-cell destruction occurs here)
T1DM initial hyperglycemia
80-90% destruction of B-cells
T1DM honeymoon phase
days to weeks after diagnosis
last for few months
BS decrease and decrease in insulin requirements
T1DM total destruction of b-cells
complete full clinical disease
T2DM defect in the secretion and function of hormones that regulate ____________ metabolism
carbohydrate
T2DM starts as insulin resistance and progresses to insulin _________
deficienct
Insulin resistance defn
excess body fat and excess glucose load cause cells to not properly recognize insulin and utilize it effectively
What does this describe:
-higher amounts of insulin are required to maintain euglycemia
-insulin promotes the storage of glucose as fat and results in weight gain
-pancreas is unable to keep up with demand and hyperglycemia occurs
insulin resistance cycle
Insulin suppresses glycogenolysis and gluconeogenesis in the _______
liver
Insulin __________ in hepatocytes causes the insulin suppression to be inhibited
resistance
Patho of pancreas, muscle, fat, liver, GI
pancreas: defective b-cell secretion
muscle: reduce glucose uptake and utilization
fat: inappropriate lipolysis
liver: excess glucose production, hepatocyte insulin resistance
GI: decreased incretin effect
What is fasting
no food for 8 hours or more
Post-prandial
1-2 hours after meal
Pre-prandial
right before a meal regard less of the time since last food
Goals for fasting, post-prandial, and pre-prandial
fasting: <130
post-prandial: <180
pre-prandial: no goal
What are continuous glucose monitors
-Device with filament inserted under the skin
-monitors blood sugars at specified intervals
-send to a smart phone
-sensor changed out every. 10-14 days
TIR (time in range) goal
aim for 70% or greater
TBR (time below range) goal
Low: <4% (<70)
Very Low: <1% (<54)
Who should use a CGM
-patients on intensive insulin therapy
-patients prone to hypoglycemia
-children as young as 2
-insurance coverage patients
How often should a fingerstick be if a patient is on non-insulin therapy only
3x/wk up to 2x qd
How often should a fingerstick be if a patient is on insulin therapy
qd up to 4x qd
How often should a fingerstick be if a patient has multiple daily injection insulin
4-6x qd
What is hemoglobin A1C
-represents percentage of total hemoglobin that has been glycosylated
-estimated average glucose over 3 months
How often to check a patient’s A1C if they are at goal compared to not at goal
goal: 6 months
not: 3 months
Limitation of A1C
-does not reflect change in blood sugar
-impacted by anything that impacts erythrocyte turnover
-does not show full tory regarding glucose excursions
Alternative glucose goals who fits this criteria
-patient w/ limited life expectancy and significant functional and cognitive impairments (A1C <8%)
-Young children
-Pregnant patients
-Patient w/ significant hypoglycemia - TIR >50%, TBR <1%
What is diabetic ketoacidosis (DKA)
life-threatening state resulting from a relative or absolute deficiency of insulin (mainly Type 1)
What is the triad in DKA
hyperglycemia
anion gap metabolic acidosis
ketosis
Pathophysiology of DKA
Insulin deficit with increased levels of stress hormones and a precipitating factor
-Stress hormones: glucagon, cortisol, epi, growth
-Precipitating factors: insulin deficiency, undiagnosed DM1, non-compliances, stress
What are the 5 results of insulin deficiency results
hyperglycemia
glycogen catabolism
glycogen depletion
lipolyis
ketosis
What is the main result of hyperglycemia
polydipsia*
polyuria*
weight loss*
volume depletion
electrolyte depletion
renal hypoperfusion
hypotension
What are the 4 ketosis results
anion gap metabolic acidosis
compensatory alkalosis
hypotension
shock
What are the diabetic ketoacidosis clinical course effects
hyperglycemia
polydipsia, polyuria dehydration
anorexia, ab pain, acidosis
Kussmaul breathing
altered consciousness
coma, death
Diagnostic criteria for DKA
BS > 250
pH <7.3
Bicarb <15
Ketonuria or ketonemia
Treatment of DKA
-IV Regular Insulin 0.1 u/k bolus or 0.1 u/kg/hr infusion (MONITOR potassium before starting)
-IV fluids 0.9% NS id corrected NA+ <135 or 0.45% NS if corrected NA >135
-IV potassium supplementation: K+ will be elevated then when IV given K+ returns to intracellular space and serum K+ will be low