Week 4: Endocrine System Flashcards
Physiological response to high plasma glucose
- Inhbt. alpha cells of the pancreas
- Stim. beta cells of the pancreas = inc. insulin
- Liver: Inc. glycolysis, inc. glycogenesis, inc. lipogenesis
- Cells: Inc. GLUT-4 receptors = inc. glucose transport into cell
Type 1 diabetes
Autoimmune attack of beta cells, little to no insulin synthesis/release
Type 2 diabetes
Dec. sensitivity to insulin, dec. beta cell function over time
Gestational diabetes
From inc. cortisol and placental production of insulin-antagonizing hormones
Diabetic ketoacidosis: Cause, presentation, treatment
Cause: High plasma glucose w/ no insulin
Presentation:
- Glucose excreted in urine (glycosuria)
- Water follows glucose out (dehydration, cerebral dehydration, shock)
- Ketoacidosis
Treatment:
- Dec. plasma glucose
- Treat dehydration
- Treat acidosis
Hyperosmolar hyperglycemic state: Cause, presentation, treatment
Cause: Gradual rise in plasma glucose
Presentation:
- Glucose excreted in urine (glycosuria)
- Water follows glucose out (dehydration, cerebral dehydration, shock)
Treatment:
- Dec. plasma glucose
- Treat dehydration
Complications of tight glucose control
Inc. risk of hypoglycemic episodes
The main difference between types of insulin is (PK/PD)
PK
Actions of insulin
- Glycogenesis
- Cellular uptake of glucose
- Protein synthesis
- Triglyceride synthesis
NPH
- Intermediate-acting insulin
- Can be combined with short-acting insulin
Detemir
- Long-acting insulin
- Usually wears off during sleep
Glargine
- Longest-acting insulin
- No peak time of activity
Aspart
Short-acting insulin
Lispro
Short-acting insulin
Glulisine
Short-acting insulin
Blood glucose effectors (5)
- Stress (inc.)
- Ingestion (inc.)
- Exercise (dec.)
- Alcohol (dec.)
- Illness (inc.)
Hypoglycemia: Possible causes
Insulin OD, dec. PO intake, nausea/vomiting/diarrhea, excessive alcohol consumption, exercise
Hypoglycemia: Presentations
Glucose <70, high HR, sweating, nervousness, severe = confusion, coma, death, hypokalemia
Biguanides: Names, actions, AE
Metformin
Actions:
- Inhibits liver glucose production
- Sensitizes insulin receptors
- Reduces gut glucose absorption
AE:
- Dec. B12 and folate absorption
- Lactic acidosis w/ toxicity
- GI upset upon initiation
Drug of choice for initial therapy in type 2
Sulfonylureas: Names, actions, AE
Glipizide, Glyburide
Actions: Promotes insulin release
AE:
- Hypoglycemia
- Weight gain
- Disulfiram reaction with alcohol
Meglitinides: Names, actions, AE
Nateglinide, Repaglinide
Actions: Promotes insulin release
AE:
- Hypoglycemia
- Weight gain
Shorter acting than Sulfonylureas
Thiazolidinediones: Names, actions, AE
Rosiglitazone, Pioglitazone
Actions: Inc. insulin response from cell
AE:
- HF due to fluid retention
- Upper respiratory infections, headaches, sinusitis, myalgia
- Bladder carcinoma from long-term/high dose therapy
Alpha-glucosidase inhibitors: Names, actions, AE
Acarbose, Miglitol
Actions: Inhibit brush border enzymes -> delayed carb absorption
AE:
- GI discomfort
- Dec. iron absorption -> anemia risk
- Long term -> liver dysfunction
Dipeptidyl-peptidase-4 inhibitors (DDP-4): Actions, AE
Actions: Inc. incretin = inc. insulin secretion response
AE:
- Hypersensitivity reactions
- Rare: Pancreatitis