Insulin and Diabetes Flashcards
Describe the age, onset, primary cause and nature of insulin defect for DM1
Age: childhood or adolescence
Onset: abrupt
Cause: autoimmune destruction of pancreatic B cells
Insulin defect: insulin dependent, lack absolute insulin
Describe the age, onset, primary cause and nature of insulin defect for DM2
Age: 40+
Onset: Gradual
Cause: insulin resistance in tissue, B cell dysfunction w/ impaired insulin secretion, increased HGP
Insulin defect: non-insulin dependent, low normal or high insulin levels
Describe the symptoms, proneness to ketosis of DM1
Sx: thin, hyperglycemia, polydipsia, polyuria, nocturia
Proneness to ketosis: PRONE!
Describe the symptoms, proneness to ketosis of DM2
Sx: 90% obese, asymptomatic
Proneness to ketosis: uncommon
Describe the tx of DM1
- Eucaloric diet
- Preprandial rapid-acting insulin
- Basal insulin replacement
Describe the pathogenesis of hyperglycemia with DM2
- Beta cell dysfunction: impaired basal and stimulated insulin secretion
- Insulin resistance in tissue: increased rate of hepatic glucose production + inefficient peripheral tissue utilization
- increased hepatic glucose production
Describe the tx of DM2
- lifestyle interventions
- weight reduction
- hypocaloric diet
- oral agents +/- insulin
what are acute diabetic complications
10% of diabetes related deaths from ketoacidosis and hypoglycemia
What are long range complications of diabetes
- Microvascular (nephropathy, retinopathy, neuropathy)
- Macrovascular (altered LDL, MI, stroke, HTN)
- Hyperglycemia w/ suspectibilty to infections
- cavities and gum disease
What stimulates insulin secretion
- Elevated plasma glucose
- nutrient breakdown products
- vagal stimulation
- B2 agonists
Describe the PK of insulin including t1/2 and elimination
t1/2: 3-5min (can be increased by keeping it away from the liver)
Elimination: liver 60%, kidney 40%
Describe the target cell metabolic effects of insulin
Liver: promotes glucose storage (glycogen) –> inhibits gluconeogenesis and ketogenesis
Muscle: increase AA transport–> protein synthesis and glycogen synthesis
Fat cells: inhibit intracellular lipolysis, increased TG storage and FA synthesis
Describe the target cell metabolic effects w/o insulin
- Decrease glucose transport into muscle–> hyperglycemia
- Decrease conversion of glucose to glycogen–> hyperglycemia
- Increase protein to glucose via gluconeogensis in liver–> hyperglycemia, muscle wasting
- Increase mobilization of peripheral fat–> increase FFA and ketone bodies–> DKA
Insulin’s actions include:
A. Increased conversion of amino acids into glucose
B. Increased gluconeogenesis
C. Increased glucose transport into cells
D. Inhibition of lipoprotein lipase
E. Increased lipogenesis
F. Stimulation of glycogenolysis
C. Increased glucose transport into cells
E. Increased lipogenesis
A 24-year-old woman with type 1 diabetes wishes to try tight control of her diabetes to improve her long-term prognosis. Which of the following insulin regimens would be most appropriate?
A. Morning injections of insulin lispro mixed with insulin aspart
B. Evening injections of regular insulin mixed with insulin glargine
C. Morning and evening injections of regular insulin supplemented by small amounts of NPH insulin at mealtimes
D. Morning injections of insulin glargine, supplemented by small amounts of insulin lispro at mealtimes
E. Morning injections of NPH insulin and evening injections of regular insulin
D. Morning injections of insulin glargine, supplemented by small amounts of insulin lispro at mealtimes
(basal + release around meals)
What are rapid acting insulins and their DOA and onset
- Gluisine
- Aspart
- Lispro
- (inhaled Afrezza ~3 hrs)
DOA:~4 hrs, onset 5-15min
*short and rapid acting are prandial insulins
What are short acting insulins and their DOA and onset
- regular insulin
DOA 5-7 hrs
onset: 30-60min
*short and rapid acting are prandial insulins
What are intermediate acting insulins and their DOA, onset, and peak
- NPH insulin
DOA: 10-20hrs
Onset: 2-4 hrs
Peak: 8-10hrs
**Given BID
*intermediate and long acting are basal insulins
What are long acting insulins are their administration
- Glargine (Lantus)- SC QD *peakless
- Detemir (Levemir)- SC BID
- Degludec (Tresiba) SC QD
*intermediate and long acting are basal insulins
What insulin is relatively peakless?
Glargine (Lantus)
*Peakless =LESS risk of hypoglycemia
What insulin can you administer IV or infusion pump for managing DKA
Regular insulin
Compare the absorption of Insulin lispro vs regular insulin
Rapid dissociation of lispro hexamer to monomer following SC injection results in more rapid absorption.
*NOTE: NO difference in onset of action if given by the IV route.
Which of the following statements is correct regarding insulin glargine?
A. It is primarily used to control postprandial hyperglycemia
B. It is considered a “peakless” insulin
C. The prolonged duration of action is due to slow dissociation from albumin
D. It is commonly used in a regimen with insulin lispro or insulin aspart
E. It may be administered intravenously in emergency cases
B. It is considered a “peakless” insulin
D. It is commonly used in a regimen with insulin lispro or insulin aspart
WD is a 40-year-old patient with type 2 diabetes who has a blood glucose of 400 mg/dL today at his office visit. The PA would like to give some insulin to bring the glucose down before he leaves the office. Which of the following would lower the glucose in the quickest manner in WD? A. Insulin aspart B. Insulin glargine C. NPH insulin D. Regular insulin E. Insulin lispro F. Insulin detemir
A. Insulin aspart
E. Insulin lispro
NPH insulin has a delayed onset by combing insulin with ___
promatine
Describe the dosing of insulin in type1 compared to type2
type1: lower dose typically, multiple dose therapy/basal-bolus
type 2: higher dose, less urgency for starting aggressive therapy due to less like DKA
What factors can alter blood glucose control?
- Diet (alcohol, overeating, irregular meals)
- Physical activity (improve insulin sensitivity)
- Stress (increase GC levels)
- Puberty
- Menstrual cycle (glucose higher premenstrually)
- Drugs
Drugs that can increase blood glucose
- GCs
2. Sympathomimeticss
Drugs that can decrease blood glucose
- BB
2. Ethanol
Complications of insulin therapy
- Hypoglycemia (MC)
- Impaired CNS fxn
- Autonomic system hyperactivity
- weight gain
- DKA
- Hyperglycemia
- Immunologic rxns
Hypoglycemia is more common in who
- older diabetes or diabetics taking long-acting insulins (goes down slowly and don’t see the SNS effects/no warning signs)
- rapid onset of sx w/ short acting insulins
Signs of hypoglycemia
- impaired CNS fxn
- night sweats
- HA
- visual disturbance
- bizarre behavior
- Increased SNS and PNS (hunger)
An unconscious patient wearing a diabetes alert bracelet is admitted to the ED. Blood sugar as measured by a glucometer was found to be very low, and the patient has skin turgor suggestive of dehydration. Before receiving stat lab results which of the following is most likely to be immediately administered? A. Bicarbonate solution B. Dextrose solution 5% C. Hypotonic saline D. Normal (isotonic saline) E. Potassium chloride solution
B. Dextrose solution 5%
Why are diabetes who are hypoglycemic also usually dehydrated?
low glucose causes dehydration because ketone bodies are excreted and not absorbed, acts as an osmotic diuretic and fluid is excreted to that way
How do you tx hypoglycemia
- Glucose (oral)
- +/- glucagon
- Dextros 50% IV if severe
How can you distinguish hypoglycemia from DKA
- DKA is generally gradual onset (hrs-days)
- acetone/sweet breath from ketone bodies
- dry
- flushed skin
- thirst
An unconscious patient wearing a diabetes alert bracelet is admitted to the ED. Blood sugar as measured by a glucometer was found to be very high, and the patient has skin turgor suggestive of dehydration. Before receiving stat lab results and in addition to IV administration of rapid-acting insulin which of the following is most likely to be immediately administered? A. Bicarbonate solution B. Dextrose solution 5% C. Hypotonic saline D. Normal (isotonic saline) E. Potassium chloride solution
D. Normal (isotonic saline)
tx of DKA
- Normal saline IV
- regular insulin (iv boluse then low dose infusion)
- +/- K and PO4 replacement
Diabetic ketoacidosis rare in Type 2 diabetics BUT dehydration in untreated, poorly controlled individuals can lead to potential life-threatening ___ coma
non-ketotic hyperosmolar
What Immunologic reactions can be seen with insulin therapy
- Insulin allergy (rare w/ human insulin)
- Insulin resistance
- Lipodystrophy (SC atrophy at injection site or hypertrophy)