Endocrinology Flashcards
symptoms of thyroid storm
hyperthermia
tachycardia
jaundice
altered mental state
cardiac (AF/high output HF)
symptoms of thyroid storm
hyperthermia
tachycardia
jaundice
altered mental state
cardiac (AF/high output HF)
Riedel’s thyroiditis
hypothyroidism caused by chronic inflammatory thyroid gland fibrosis
2 medications that interact with Levothyroxine
Iron
Calcium carbonate
symptoms of myxoedema coma
hypothermia
hyporeflexia
bradycardia
seizures
causes of pseudo-Cushing’s
alcoholism
severe depression
use insulin stress test to tell difference with Cushing’s
screening test for Cushing’s
11pm salivary cortisol (high)
LDDST
how to determine cause of hyperaldosteronism
HR-CT and adrenal vein samplinh
renal and non-renal causes of hypernatraemia
renal: osmotic diuresis (T2DM) or DI
non-renal: GI losses, sweat losses of water
renal and non-renal causes of hypernatraemia
renal: osmotic diuresis (T2DM) or DI
non-renal: GI losses, sweat losses of water
causes of pseudohyponatraemia
hyperlipidaemia
hyperproteinaemia
imaging in myeloma
whole body low dose CT
refeeding syndrome symptoms
rhabdo
low RR
arrythmias
shock
seizures
coma
management of fibromuscular dysplasia
stop smoking
anti-platelets
anti-HTN
surgical stenting
causes of hypoMg
diuretics/PPIs
diarrhoea
TPN
ETOH
HypoK, HypoCa
visual defect with lesion in optic radiation
superior quandrantopia
visual defect with lesion in optic tract
homonymous hemianopia
when do you switch the insulin infusion to SC insulin in DKA?
when blood ketones <0.3mmol/L
SE’s of carbimazole
maculopapular rash
bone marrow suppression = agranulocytosis
pruritis
jaundice
how should insulin regimes be managed pre-operatively
reduce dose insulin on day of operation and day before
what to do if you have subclinical hypothyroidism?
repeat TFTs in 6-8 weeks
1. if T4 normal, TSH> 10 = treat
2. TSH 5-10, thyroid Ab +ve = repeat annually, commence thyroxine when TSH >10
3. TSH 5-10, thyroid Ab -ve = check every 3-5 years
TSH dec/normal and low fT4, cause?
secondary hypothyroidism
?pituitary dysfunction - check cortisol
TSH dec/normal and low fT4, cause?
secondary hypothyroidism
?pituitary dysfunction - check cortisol
cause of a high Ca and low PTH
cancer
cause of a high Ca and high PTH
parathyroid disease
what is Chvostek’s sign?
tap facial nerve = facial muscle twitch
what is Trousseau’s sign?
inflate arm cuff = carpopedal spasm
when is hypoCa an emergency and how to treat?
if QT prolonged, signs of tetany
Tx: Ca gluconate 10%
Cardiac monitoring, check serum Mg and PTH
when it is not emergency, how to manage?
bloods for PTH/Vit D
Endo clinic
Calchichew tabs
causes of hypercalcaemia
primary hyperparathyroidism
malignancy
myeloma
sarcoid
thiazides
diabetic neuropathy abdo pain
gastroparesis = vagus neuropathy
management = metaclopramide
when do you start ACEi in T2DM if ACR
ACR >3.0mg/mmol
insulin monitoring when sick?
continue normal insulin (more monitoring)
examples of sulphonylureas
Glibenclamide
Gliclazide
examples of DPP4 inhibitor
Sitagliptin
classification of thyroid
Thy 1 classification
low uptake thyroiditis
subacute thyroiditis
post-partum thyroiditis
thyroid storm management
IV propanolol = thionamides
Hydrocortisone = Iodine
Interactions of thyroxine
Iron
CaCO3
Addison’s
9am plasma cortisol
synACTH test
ACTH dependent causes
Cushing’s disease
ectopic ACTH
ACTH independent causes
steroids
adenoma/carcinoma
Pseudo-Cushing’s causes
alcohol excess
severe depression
detect by insulin stress test
Cushing’s test
11pm salivary cortisol
LDDST
Hypernatraemia - increase in Na causes
- medical/dietary high intake
- Conn’s
- RAS
Hypernatremia - loss of water
renal losses: osmotic diuresis, DI
non-renal losses: GI loss, sweat loss
SIADH drug causes
SSRI
TCA
PPI
Carbamazepine
SIADH investigations
plasma and urine osmolality
main causes of hyperkalaemia
renal impairment
Drugs (ACEi, ARBs, spirnolactone)
Low aldosterone (Addison’s, T4RA)
Release from cells - Rhabo
Main causes of hypokalaemia
GI losses
Renal losses (MR excess, osmotic diuresis)
Redistribution in cells (insulin, alkalosis)
Rare (RTA, T1+T2, hypoMg)
HyperCa and QT
short QT
HypoCa and QT
low QT, low Mg
Management of myeloma
induction = thalidomide + dexa
bone disease = bisphosphonate + analgesia
Refeeding syndrome S/S
Rhabdo, low RR, arrhythmias, shock, seizures
Refeeding management
phosphate supplements
common causes of polyuria
diuretics, caffeine, ETOH, DM, Lithoum, HF
infrequent causes of polyuria
HyperCa, Hyperthyroidism
rare causes of polyuria
CRF, primary polydipsia, dec potassium
investigations in polyuria
bloods (including paired serum + urine osmolarity)
water deprivation test
Abs in Vit B12
Anti-IF AB
Causes of HypoMg
Drugs (diuretics, PPI)
Diarrhoea
TPN
ETOH
dec K, dec Ca
S/S of HypoMg
paraesthesia, seizures, tetany, arryhtmias
ECG of HypoMg
similar to HypoKa
when to use Mg IV replacement?
<0.4
complications of diabetes
Macrovascular (MI, CVA)
Microvascular (Eyes, Kidneys, Nerves)
These need monitoring
when is metformin contraindicated?
GFR < 30
what is exanatide?
GLP-1 agonist
how do you know when DKA is resolved?
ketones < 0.3 mM + venous pH > 7.3
hypoglycaemia symptoms
autonomic (2.5-3): sweating, anxiety, hunger, tremor, palpitations
neuroglycopenic (<2.5): confusion, drowsiness, seizures, personality change
important treatment in thyrotoxicosis
first carbimazole then Lugol’s iodine 4 hours later to inhibit thyroid
early complications of thyroid surgery
haematuria
laryngeal oedema
recurrent laryngeal nerve palsy
hypoparathyroidism
thyroid storm
hypokalaemia symptoms
weakness
hypotonia
hyperreflexia
cramps
what is secondary hyperaldosteronism?
increase renin from decrease renal perfusion
MEN 1
pitutary adenoma
parathyroid adenoma
pancreatic tumour
MEN 2
thyroid Ca, phaeo
A: hyperthyroid
B: Marfanoid
what cranial nerve palsies can pituitary tumours cause?
CN 3, 4, 5, 6 palsies
normal relationship between PTH, Ca and PO4
PTH causes inc Ca and dec PO4
causes of hypoCa with increased PO4
CKD
inc PTH
dec Mg
causes of hypoCa with decreased or normal PO4
osteomalacia
pancreatitis