Endocrine Flashcards
What antibodies do we check for type 1 diabetes?
GAD65 and IA-2
How treat hypoglycemia unawareness?
lowering insulin dose and allowing average plasma glucose to rise for several weeks
How diagnose Type 2 diabetes?
Elevated fasting glucose >126 x 2
Random glucose > 200 with symptoms (no need for repeat)
A1c > 6.5 x2
2 hour glucose after OGTT > 200 x2
When start screening for type 2 diabetes?
USPSTF - age 40 and up if overweight, earlier if risk factors
ADA - overweight adults with one add’l risk factor and all patients 45 or older
What is the most effective way to minimize a patient’s risk of developing diabetes?
Intensive weight loss and dietary / lifestyle modification (not metformin!)
If a patient is non adherent with multiple insulin injections is there adherence likely to increase by using an insulin pump?
no
In what situations will the A1c be falsely low?
hemolytic anemia, patients taking Epo, patients with AKI
What is the GFR threshold for Metformin (At least according to boards guides)
GFR 30
when should screening for complications begin in patients with type 1 diabetes and type 2 diabetes?
type 1 - five years after diagnosis
type 2 - immediately
What intensity statin is recommended for:
Diabetes and avg cardiovascular risk?
Age 40 and up, ASCVD < 7.5 -> mod intensity statin
What intensity statin is recommended for:
Diabetes and CAD, peripheral vascular dz and ASCVD > 7.5?
High intensity statin
How treat diabetic mononeuropathy? ex. 3rd nerve palsy
trick question, do not treat, resolves spontaneously
How dx HHS
isms > 320, glucose > 600, low or no serum ketones and a relatively normal arterial pH and bicarb
How treat HHS?
Volume resuscitate with NS
IV insulin AFTER expanding intravascular volume
SubQ insulin when patient is eating and glucose is < 200
How diagnose DKA?
hyperglycemia, ketosis and hypovolemia, pH < 7.3, bicarb < 15, Anion gap
How treat DKA?
Normal saline, (1/2 normal if serum sodium is high or normal), then insulin, K repletion, glucose when plasma glucose < 250. Continue insulin and glucose until anion gap is normal
Should you stop insulin infusion in DKA before complete clearing of ketones?
No, not according to Board Basics, ‘will cause relapse of DKA”
What are the inpatient glucose goals for critically ill patients
140 to 180
When should pregnant women be screened for gestational diabetes?
24 to 28 weeks gestation with 75gm 2 hour OGTT
How often should women with gestational diabetes be screened for diabetes after delivery?
annually
How are pregnant women with gestational diabetes treated differently than non pregnant adults?
- insulin is preferred after dietary changes
- ACE, ARBs and cholesterol lowering drugs should be stopped
- eye exam once per trimester
- aggressive BP control with methyldopa, b-blockers (except atenolol), CCBs and hydral
Patient without diabetes, fasting glucose <60, asymptomatic, should they be evaluated?
NO! (see page 83 board basics)
How can C peptide testing be used to evaluate non diabetic fasting hypoglycemia?
marker of endogenous insulin production, cleavage product of insulin production.
Elevated iso: surreptitious use of oral hypoglycemic agents, insulinoma
Low iso surreptitious use of exogenous insulin
Workup of suspected insulinoma?
72 hour fast: measure glucose, insulin and peptide. If glucose <45, insulin > 5-6 and c peptide elevated then proceed with abdominal imaging
When suspect hypopituitarism?
primary target organ hypo function PLUS headache or loss of peripheral vision
If concerned about pituitary apoplexy, how should you treat?
glucocorticoids until AI has been ruled out
How classify pituitary adenomas?
microadenoma <10mm
macroadenoma >= 10mm
If you see:
galactorrhea and amenorrhea
Next steps?
serum prolactin level to assess for prolactinoma
If you see:
enlargement of hands, feet, nose, lips or tongue and increased spacing of teeth
Next steps?
Serum IGF-1 and OGTT to assess for acromegaly
If you see:
Prox muscle weakness, facial rounding, centripetal obesity, striae, diabetes and HTN
Next steps?
24hr urine cortisol excretion, Dex suppression test or late night salivary cortisol, elevated serum ACTH level to assess for Cushing’s
Goiter and hyperthyroidism
Next steps?
Check TSH and T4 for TSH secreting pituitary adenoma (rare)
How manage prolactinoma if:
- microprolactinoma, normal menses
observation
How manage a prolactinoma if:
symptomatic
medication such as a dopamine agonist like cabergoline (preferred to bromocriptine), can stop if prolactinoma no longer seen on imaging but need to repeat testing because recurrence rates are up to 50%
How manage a pituitary adenoma secreting GH, ACTH or TSH or if have mass effect or unresponsive to meds
surgery
How to confirm the diagnosis of diabetes insipidus?
urine osms less than 200 and inability to increase urine concentration during a water deprivation test
How you differentiate between Central and nephrogenic DI?
Desmopressin challenge. If the urine concentrates and that indicates central. Next order an MRI the pituitary gland. If The test is negative then order a kidney ultrasound.
How does subacute thyroiditis typically present?
Firm and painful thyroid gland
What can happen as a result of all forms of destructive thyroiditis
Permanent hypothyroidism
What does the term hyperthyroidism refer to?
Increased thyroid hormone production and release
What are some signs of hyperthyroidism in older adults
Atrial fibrillation, heart failure, depression
How does one diagnose thyroid storm?
Clinical diagnosis. Life threatening hyperthyroidism associate cardiac decompensation, fever, delirium and psychosis
How does one diagnose hyperthyroidism?
TSH and free T4. If TSH is suppressed and T4 is normal, order free T3
How does exogenous thyroid hormone impact thyroglobulin levels?
decreases thyroglobulin levels. can use this to diagnose surreptitious use of thyroid hormone
What is the diagnosis: elevated TSH, elevated T3, elevated free T4?
Secondary hyperthyroidism from a pituitary tumor
Diagnosis from RAIU scan: diffuse homogeneous increased uptake
Graves disease
Diagnosis from RAIU scan: patchy areas of increased uptake
Toxic multi nodular goiter
Diagnosis from RAIU scan: focal increased uptake with decreased uptake uptake in the rest of the gland
Solitary adenoma
Diagnosis from RAIU scan: decreased or no uptake
Iodine load, thyroiditis, surreptitious ingestion of thyroid hormone
Radioactive iodine therapy is first-line for what diagnoses?
Toxic multinodular goiter
Toxic adenoma
- do not use in pregnancy or breast-feeding
Typically restores euthyroidism
What medication is first-line for Graves disease?
Methimazole
SE: agranulocytosis, drug rash, hepatotoxicity
What medication is first line for Graves disease in the first trimester and preferred in thyroid storm?
PTU (Propylthiouracil)
SE: Agranulocytosis, drug rash, hepatotoxicity (more common than with Methimazole)
What is the preferred treatment and definitive therapy for severe Graves opthalmopathy?
Thyroidectomy (also first line if local symptoms from bulk effect)
Management of thyrotoxicosis: treatment for sympathetic nervous system symptoms
Atenolol or propranolol
Management of thyrotoxicosis: preparation for thyroidectomy
Methimazole
Management of thyrotoxicosis: severe Graves ophthalmopathy
Methimazole or thyroidectomy
avoid radioactive iodine because can cause worsening ophthalmopathy
Management of thyrotoxicosis: pregnancy
PTU the first trimester
Methimazole in 2nd and 3rd
NO radioactive iodine
Management of thyrotoxicosis: subclinical hyperthyroidism
Methimazole if TSH <0.1
Management of thyrotoxicosis: subacute thyroiditis
NSAIDs or glucocorticoids for pain
Beta blockers for symptoms
levothyroxine for symptomatic hypothyroidism
Repeat thyroid studies in 4-6 months
50% of patients thyroid studies will normalize without intervention
Management of thyrotoxicosis: suspicious nodule
Fine needle aspiration followed by thyroidectomy if Malignant
Management of thyrotoxicosis: thyroid storm
PTU
Iodine potassium solutions
glucocorticoids
beta blockers
If you see a patient with a fever or sore throat on PTU or Methimazole what should you presume?
agranulocytosis
What labs does a patient with central hypothyroidism have?
low TSH and low T4 (both suppressed)
Is an antithyroid peroxidase antibody assay needed to make the diagnosis of Hashimoto’s thyroiditis?
no, but high levels are associated with higher risk of permanent hypothyroidism
What other lab findings can be seen in hypothyroidism?
- elevated prolactin
- low sodium
- increased CK, AST, cholesterol
hypothyroidism labs in an inpatient – what should you do?
repeat labs in 4-8 weeks, usually recover
Do you need a thyroid scan and radioactive iodine uptake test to diagnose hypothyroidism?
NO