Endocrinology Flashcards
(48 cards)
How do you diagnose diabetes?
If positive, need to confirm on a second day. No need if positive AND symptomatic:
A1c > 6.5%
Fasting glucose > 7
2h 75g oGTT >= 11.1
Random glucose >= 11.1
how do you prevent/treat atypical femoral fractures?
Prevent: consider drug holiday on oral bisphosphonates for 5 years (IV for 3 years) - DO NOT STOP IN HIGH RISK PTs
Treat: stop bisphosphonate. Consult ortho. ? teriparatide
How do you screen and diagnose acromegaly?
Screen: IGF1 level
Diagnose: 75g glucose suppression
How do you screen for cushing’s?
Need 2/3 of:
Midnight salivary cortisol
1mg dex suppression test
24 hour urine free cortisol
How do you treat hypoglycemia episode?
Mild to moderate - 15g glucose/sucrose tabs
Severe (require assistance) 20g glucose tab
If taking acarbose, NEED TO GIVE DEXTROSE OR MILK OR HONEY
Unconscious = 1mg glucagon IM or 10-25g of dextrose IV
How do you treat Paget’s disease of the bone?
IV bisphosphonate
How does ACTH help in diagnosis of Cushing’s?
If ACTH high, consider pituitary or ectopic source. Need 8mg Dex supp test. If suppressible, likely pituitary source. Otherwise CT chest for ectopic source.
If ACTH low, consider adrenal adenoma/carcinoma. NEED CT ADRENAL
How does Mg affect Ca balance?
Low Mg reduces PTH secretion and causes PTH resistance
Low Mg = hypoPTH = High PO4 and LOW Ca
How does PTH affect calcium and phosphate?
Increases calcium and decreases phosphate
How does thiazide affect PTH?
May cause low PTH due to associated hypercalcemia, but can also unmask primary hyperPTH and cause increase in PTH
how does vitamin D affect calcium and phosphate?
Both go same direction.
I.e granulomatous disease = hyper Ca hyper PO4
How much do you expect to reduce LDLs with initiation of statins?
20-40% reduction for starting dose
Additional 6% for each doubling of dose
What are “automatic” high risk features for future osteoporotic fractures?
- Prior fragility fracture AND prolonged use of steroids (>=7.5mg/d x 3 months)
- Hip or Spine fracture
- > 1 fragility fracture
What are 3 benefits to switch from basal bolus regimen to continous subcutaneous insulin infusion for type 1 diabetics?
Small improvement in A1c
Increased treatment satisfaction and QoL
Reduction in severe hypoglycemia if high rates of baseline severe hypos
What are 3 situations when target of A1c should be < 8.5%
Recurrent severe hypo/hypo unawareness
Decreased life expectancy
Frail elderly with dementia
What are antithyroid drug options? When should you use them?
Methimazole and PTU
MMZ > PTU EXCEPT
Pregnancy
Thyroid storm
Minor MMZ reactions
What are components of MEN1 syndrome?
PPP
Parathyroid
Pituitary adenoma
Pancreatic (insulin, gastrin, VIP)
What are components of MEN2A syndrome?
PMP
Parathyroid
Medullary thyroid
Pheochromocytoma
What are components of MEN2B syndrome?
MMP
Marfanoid, mucosal neuromas
Medullary thyroid
Pheochromocytoma
What are contraindications to radioactive iodine ablation?
Pregnancy, breast feeding, moderate to severe orbitopathy (can worsen orbitopathy)
Need to stop methimazole for 2-3 days prior
If given with orbitopathy, need steroids
What are high risk features of thyroid nodule ultrasound?
hypoechoic irregular margins Microcalcifications or interrupted rim calc. Taller than wide, extend beyond thyroid lymphadenopathy >20% increase in 2 dimensions
What are indications for surgery for primary HyperPTH?
Stay The Fudge Away U Silly Calcium
Serum calcium > 0.25 upper limit T score < 2.5 at L spine, hip, femoral neck or distal radius Fractures Age < 50 Urine calcium > 10mmol/d (>400mg/d) Stones or nephrocalcinosis Creatinine clearance <60ml/min
What are indications for surgery in tertiary hyperparathyroidism?
Refractory hyperPTH despite vit D analogues/calcimimetics
Hypercalcemia severe/symptomatic
Calciphylaxis
Progressive bone dx
What are JAMA RCE findings of osteoporosis?
Weight < 51kg (LR+ 7.3) Wall-occiput distance > 0cm (LR+ 4.6) Rib pelvis distance <2 finger width (LR+ 3.8) Tooth count < 20 (LR+ 3.4) Self-reported hump back (LR+ 3.0)