Pharmacology Unit 4 - Endocrine Pt. 3 Flashcards
which sulfonylurea has the lowest incidence of hypoglycemia?
nateglinide (D-phenylalanine derivative)
what pharmacologic agent is the first line therapy for DM II
metformin
black box warning of metformin
lactic acidosis
due to the black box warning with metformin, it is c/i in who?
- any renal dz
- etoh-ism
- hepatic disease
- any condition that predisposes to tissue anoxia
which anti-diabetic agent is described as a “euglycemic agent” due to less fasting, and less postprandial hyperglycemia, and hypoglycemia?
metformin
MOA of biguanides (metformin)
reduces hepatic glucose production through the activation of AMP-activated protein kinase
_____________ is an antidiabetic agent that is excreted by the kidneys as the active compound
meformin
1/2 life of metformin
1.5-3 hours
toxicity of metformin
- lactic acidosis
- vitamin B12 deficiency
- GI: anorexia, N/V/D, abdominal pain
if a patient presents for contrast study on metformin, the drug should be stopped ________ days prior
2-3
which antidiabetic agents are thiazolidinediones
“-glitazone”
- rosiglitazone (Avandia)
- Piogllitazone (Actos)
toxicity of thiazolidinediones
- fluid retention
- edema
- weight gain
- anemia
- bone fractures in women
c/i of thiazolidinediones
- CHF
- hepatic disease
what is the biggest contraindication with Rosiglitazone (avandia)?
heart disease, d/t it worsening the condition
Thiazolidinediones MOA
- regulates gene expression by binding to PPAR-Y
- reduces insulin resistance in T2DM
Thiazolidinediones are long acting oral antidiabetic agents. Effects last > __________ hours
24
which meds are alpha glucosidase inhibitors
Acarbose and Miglitol
which type of oral antidm agents reduce the post meal excursion by delaying the digestion and absorption of starch and disaccharides?
alpha glucosidase inhibitors (Acarbose & miglitol)
why must hypoglycemia secondary to alpha-glucosidase inhibitors have to be treated with glucose?
bc the metabolism of sucrose might be blocked
which oral anti-dm agent is a bile acid sequestrant?
colesevelam HCL
what is the MOA of bile-acid sequestrants (colesevelam hcl) in the tx of dm?
unknown
bile acid sequestrants like colesevelam hcl are approved as a _______________ antihyperglycemic therapy
DMII
pharmacological effect of glucagon
increases cAMP –> catabolism of stored glycogen, increases gluconeogenesis, and ketogenesis
glucagon has potent ____________ and ____________ effects on the heart
inotropic; chronotropic
what are the clinical uses of glucagon
- hypoglycemia
- dx of endocrine d/o
- B-blocker OD
- radiological procedure of the bowel
why is glucagon used in radiological procedures of the bowel
it relaxes the intestines.
what are the 3 primary hormones for Ca and Phos homeostasis
- Fibroblast Growth Factor 23 (FGF23)
- PTH
- Vitamin D
which hormone for Ca and Phos homeostasis is considered a “prohormone,” meaning it requires further metabolism to gain biologic activity
Vitamin D
Net effect of PTH on serum levels
increased calcium, decreased phos
net effect of FGF23 of serum levels
decreased phos
net effect of Vitamin D on serum levels
increased Calcium and Phos
________________ and ____________ regulate bone formation and resorption, BOTH are capable of stimulating both processes
PTH; vitamin D
osteoblasts = ___________________
bone forming cells
Vitamin D is produced in the ______________ when stimulated by __________
kidney; PTH
what inhibits the production of Vitamin D
FGF 23
Vitamin D inhibits the production of ______________ and stimulates the release of _________________
PTH; FGF23
____________________ is the principal regulator of intestinal Ca nd P absorption
Vitamin D
what are 2 of the most important minerals for general cellular function?
Ca and Phos
Ca and P enter the body from the ________________
intestine
Ca and P are excreted via _______________, which balances the intestinal absorption
kidneys
Actions of Calcitonin
- lowers serum Ca and P through bone and kidney action
- inhibits osteoclastic bone resorption
- reduces Ca and P reabsorption in the kidney
Calcitonin is used the tx of
- pagets Dz
- hypercalcemia
- osteoporosis
Glucocorticoid effect on Calcium levels
- antagonizes Vitamin D stimulated intestinal calcium transport
- stimulates calcium excretion in the kidneys
- blocks bone formation
_______________ prevents accelerated bone loss during the post menopausal period
estrogen
what are your non-hormonal agents that affect bone mineral homeostasis
- Bisphonates
- RANK lingand inhibitors
- Calcium receptor agonists
- Thiazide diuretics
- Plicamycin
bisphonate drugs end in ?
”- dronates”
MOA of bisphonates
- inhibit bone resorption (decreases serum calcium which stimulates PTH –> increased serum calcium and decreased phos)
- inhibits secondary bone formation
what type of drug is Denosumab
a RANK-L inhibitor
MOA of Denosumab
interferes with RANK-L fx –> inhibition of osteoclast formation and activity
Cinacacet is what type of drug
calcium receptor agonist
what is the MOA of Cincalcet
activates Ca receptors of the PTH gland which inhibits the release of PTH
Cinacalcet is approved for the treatment of ?
- secondary hyperparathyroidism
- secondary CKD
- parathyroid carcinoma
how do thiazide diuretics affect calcium homeostasis
increases the reabsorption of Calcium, thus increasing serum calcium levels
Plicamycin is a ____________________, which is (rarely) used in the tx of _____________ & ________________
cytotoxic Abx; pagets dz; hypercalcemia
major causes of hypercalcemia
- hyperparathyroidism
- Cancer with or without bone mets
___________________ can lead to CNS depression, which can lead to coma without treatement
hypercalcemia
Tx of hypercalcemia
- 500-1L/h saline + lasix
- bisphonates
- calcitonin
- gallium nitrate
- plicamycin
- IV phosphate
- glucocorticoids
what is the fastest and surest way to reduce serum calcium levels?
IV phosphate
if IV phosphate is administered too fast, what can happen?
deplete calcium –> arrhythmias and cardiac arrest
__________________ IV will lower serum calcium substantially within 24-48 hours; however, it is not the drug of choice because of toxicity
plicamycin
s/sx of hypocalcemia
- tetany
- parasthesias
- muscle cramps
- seizures
- LARYNGOSPASM