Endo Flashcards
Causes of thyrotoxicosis
- Graves
- toxic nodular goitre
- acute phase of subacute (de Quervain’s) thyroiditis
- acute phase of post-partum thyroiditis
- acute phase of Hashimoto’s thyroiditis
- amiodarone therapy
Management of papillary and follicular thyroid cancers
Total thyroidectomy
Followed by radioiodine I-131
Yearly thyroglobulin levels to detect recurrence
Follow up for gestational diabetes when glucose normal after birth?
Fasting blood glucose check at 6-13 weeks postpartum
Management of thyrotoxic storm:
Propylthiouracil (PTU) + corticosteroids + propranolol.
MEN I cancers
3Ps:
Parathyroid
Pituitary
Pancreas (insulinoma, gastrinoma)
Also adrenal + thyroid
MEN IIa cancers
Medullary thyroid
+ 2Ps:
Parathyroid
Phaeochromocytoma
MEN IIb cancers
Medullary thyroid
+ 1P:
Phaochromocytoma
Marfanoid
Neuromas
Genetics MEN I
‘MEN1 gene’
Genetics MEN IIa
RET oncogene
Genetics MEN IIb
RET oncogene
Canakinumab MOA
Inhibits interleukin-1B receptor binding
Canakinumab use
Acute gout where NSAIDs or colchicine are not tolerated or ineffective
pH indicating severe DKA
pH <7
Blood ketone, severe DKA
blood ketone >6 mmol/L
Bicarbonate level, severe DKA
Bicarbonate < 5 mmol/L
Normal anion gap
< 16 mmol/L
Potassium level indicating severe DKA
Potassium < 3.5 mmol/L on admission
Obs suggesting severe DKA
Tachycardia/bradycardia
Systolic BP < 90 mmHg
Sats <92% on air
GCS
Thiazolidinedione example
Pioglitazone
Anti-diabetic linked to bladder cancer
pioglitazone (Thiazolidinedione)
Thiazolinedione (pioglitazone) MOA
Insulin sensitizer
PPAR-gamma receptor agonist
Long-term management of diabetic gastroparesis
Domperidone, metoclopramide or erythromycin
Management of myxoedema coma
IV thyroid replacement IV fluid IV corticosteroids (until coexisting adrenal insufficiency excluded) Electrolyte replacement Rewarming
Myxoedema coma presentation
Confusion
Hypothermia
Bradycardia
Profoundly hypothyroid
Marker for medullary thyroid cancer
Calcitonin
Sulfonylurea example
Gliclazide
Gliptin example (DPP-4 inhibitor)
Sitagliptin
Thiazolidinedione example
Pioglitazone
SGLT-2 inhibitor examples
Dapagliflozin,
Empagliflozin
GLP-1 mimetic examples
Exenatide,
Liraglutide
Pioglitazone (Thiazolidinedione) side effects
Weight gain Fluid retention Liver impairment Increased risk of fractures Increased risk of bladder cancer
Management of hypertriglyceridaemia
Fibrates (fenofibrate)
Statins may be indicated if mixed hyperlipidaemia
Causes of primary hypothyroidism
Iodine deficiency
Iatrogenic (thyroidectomy, radioiodine, drugs)
Autoimmune (Hashimoto’s, atrophic)
Thyroiditis (post-viral/DeQuervain, post-partum)
Carbimazole side effect
Neutropenia
Cholestasis
Rash
Test to diagnose thyroiditis
Thyroid scintigraphy - shows reduced uptake of iodine-131
Features of abetalipoproteinemia
Steatorrhoea + poor growth
Neurological dysfunciton
Visual impairment
Treatment of abetalipoproteinemia
Dietary fat restriction
High-dose Vitamin E
Deficiency in Abetalipoproteinemia
Apolipoprotein B-48 + B-100
QRISK2 score should not be used in:
> =85 years
Type 1 diabetics
eGFR <60 / albuminuria
FH of familial hyperlipidaemia
Offer statin primary prevention in T1DM if:
Older than 40, or, Had diabetes >10 years, or, Have nephropathy, or, Have other CVD risk factors
Criteria for continuing GLP-1 mimetic
Only continue if HbA1c reduced by >=11 after 6 months
1st line drug in MODY
Sulfonyurea (eg glipizide)
1st line treatment for prolactinoma (even if very large!)
Dopamine agonist (cabergoline, bromocriptine)
Pseudo-hypoparathyroidism Type 1a AKA
Albright’s Hereditary Osteodystrophy
Initial insulin regime in type 1 diabetic - new diagnosis in adult
Basal-bolus using twice-daily insulin detemir
Findings in Gitelman’s syndrome (defective NaCl transporter)
Hypokalaemia
Normotensive
Low urinary calcium
T1DM glucose target, on waking
5-7mmol/L
T1DM glucose target, before meals
4-7mmol/L
T1DM glucose target, 90min after eating
5-9mmol/L
Type 1 RTA - location + defect
Distal tubule, inability to secrete H+ into urine
Causes of type 1 RTA (distal)
Idiopathic
Rheumatoid arthritis, SLE, Sjogren’s
Amphotericin B toxicity
NSAID nephropathy
Type 2 RTA (proximal) - defect
Decreased HCO3 reabsorption
Causes of type 2 RTA (proximal)
Idiopathic
Fanconi syndrome, Wilson’s disease, Cystinosis
Carbonic anhydrase inhibitors
Outdated tetracyclines
Type 3 RTA - caused by
carbonic anhydrase II deficiency
Type 4 RTA - location + defect
proximal tubule, decreased ammonium excretion
Type 4 RTA - caused by
hypoaldosteronism
diabetes
(NSAIDs)
Type 1 RTA - metabolic effect
Hyperchloraemia
Severe metabolic acidosis,
with Hypokalaemia
Type 2 RTA - metabolic effect
Hyperchloraemic metabolic acidosis,
Hypokalaemia
Type 4 RTA - metabolic effect
hyperchloraemic metabolic acidosis,
with hypERkalaemia
Type 3 RTA (mixed) - metabolic effect
Hyperchloraemic metabolic acidosis
Hypokalaemia
Primary hyperparathyroidism - definitive management
Total parathyroidectomy
Primary hyperparathyroidism - conservative management considered if:
> 50 yo
Calcium level less than 0.25 mmol/L over upper limit
No evidence of end-organ damage
Cinacalcet (calcium mimetic) is used in
Primary hyperparathyroidism, to reduce calcium levels
Glucagonoma features
Diabetes
VTE
Necrolytic migratory erythema
Management of prolactinoma
1st line: dopamine agonist (cabergoline, bromocriptine)
2nd line: surgery
Contraindication to pioglitazone
Congestive cardiac failure
Sulfonylurea (eg gliclazide) MOA
Increases glucose-independent insulin release
GLP-1 agonist MOA
Binds GLP-1 receptor on beta cells to increase glucose-dependent insulin secretion
DPP4 inhibitors (sitagliptin) MOA
Inhibit breakdown of GLP-1 to increase glucose-dependent insulin secretion
Metformin MOA
Biguanide: Insulin sensitizer
Thiazolidinediones (pioglitazone) MOA
Insulin sensitizer
SGLT-1 inhibitor MOA
Inhibit glucose reabsorption in kidney
Acromegaly - sources of raised GH
- Pituitary adenoma 95%
- Ectopic GHRH/GH (pancreatic tumour)
Acromegaly features
Facial features + large hands, feet, jaw, tongue
Sweating (gland hypertrophy)
Tumour: bitemporal hemianopia, hypopituitarism, raised prolactin
Acromegaly genetics
MEN-1 in 6%
Acromegaly complications
HTN
Diabetes
Cardiomyopathy
Colorectal cancer
Deficiency in congenital adrenal hyperplasia
21-hydroxylase deficiency (90%)
11-beta hydroxylase deficiency (5%)
17-hydroxylase deficiency (very rare)
Inheritance pattern of congenital adrenal hyperplasia
Autosomal recessive
Diagnosis of congenital adrenal hyperplasia
Raised 17-OH progesterone
Features of 21-hydroxylase mutation (Classic Congenital Adrenal Hyperplasia)
- Virilisation
- Salt wasting
- Hypovolemia/shock
Features of CAH - 11-beta hydroxylase mutation
- Hypertension
- Virilisation
Features of CAH - 17-alpha hydroxylase mutation
- Hypertension
- No virilisation
Insulin stress test cushings vs pseudo-cushings
Cushings: limited rise in cortisol
Pseudo-cushings: normal rise in cortisol
Tests to confirm Cushings syndrome/pseudo-cushings is present
- Overnight dexamethasone suppression test
- 24hr urinary free cortisol
Kallman syndrome
Hypogonadotrophic hypogonadism
Failure of migration of GnRH-releasing neurons and olfactory neurons
Hormone levels in Kallmann’s syndrome
- Low GnRH
- Low gonadotrophs (LH, FHS)
- Low sex hormones (estrogen, progesterone, testosterone)
- Other pituitary hormones normal
Kallmann’s syndrome - inheritance pattern
X-linked recessive
Kallmann’s syndrome - features
Delayed puberty Low sex hormones Small testes Anosmia Tall
Commonest thyroid cancer
Papillary - 70%
Thyroid cancer which may cause pressure symptoms
Anaplastic
2nd commonest thyroid cancer
Follicular 20%
Which thyroid cancer is associated with MEN II
Medullary
Which cells involved in medullary thyroid cancer
Parafollicular (c) cells
T2DM HbA1c target - lifestyle changes alone
48 mmol/mol (6.5%)
T2DM HbA1c target - on metformin only
48 mmol/mol (6.5%)
T2DM HbA1c target - on a drug which may cause hypoglycaemia
53 mmol/mol (7.0%)
Which diabetes drugs may cause hypoglycaemia
Sulfonylurea (gliclazide)
Insulin
T2DM on 1 drug - if HbA1c rises to this level, should add a second drug
58 mmol/mol (7.5%)
T2DM on metformin and HbA1c rises to >58
Add gliptin / sulfonylurea / pioglitazone / SGLT-2 inhibitor
T2DM on metformin and 1 other drug and HbA1c >58
Triple therapy
Or consider insulin
Criteria for adding GLP-1 mimetic (exenatide)
Triple therapy not effetive/not tolerated and:
BMI >= 35
or <35 but cant use insulin due to occupation/weight loss beneficial for other comorbidities
Criteria for continuing GLP-1 mimetic after 6 months
HbA1c reduction of at least 11 mmol/mol
and
Lost at least 3% of initial body weight
Statin for primary prevention - indications
10yr CVD QRISK2) >= 10%
T1DM
CKD with eGFR <60
Statin for primary prevention - titration
If non-HDL not fallen by >= 40%, consider uptitrating to 80mg
Statin for secondary prevention - indications
Known IHD
Cerebrovascular disease
Peripheral arterial disease
SIADH - 1st line management
Fluid restriction
SIADH - management if resistant to fluid restriction
Demeclocycline
Demeclocycline MOA
Inhibits effect of ADH on renal tubules
Orlistat MOA
Inhibits pancreatic lipase
Orlistat criteria for starting
BMI >= 30
or
BMI >=28 with risk factors
And 3 months of dietary + lifestyle measures have failed
Orlistat criteria for continued use
Weight loss of 5% at 3 months
May only be used for <1 year
Criteria for weight loss surgery
Failure of non-surgical measures
BMI >40, or BMI 35-40 with other disease
Commits to long-term followup
Anti-thyroid drugs in pregnancy
Propylthiouracil in first trimester (SE hepatotoxicity)
Switch to carbimazole at start of second trimester (SE congenital abnormality)
Management of Addisonian crisis
Hydrocortisone 100mg IM/IV
- 6hrly until stable
IV fluids
PO steroids after 24hrs
Thyroid nodule, TSH is low - next investigation?
Thyroid uptake scan
- If cold/iso nodule -> FNA
- Hot nodule - no FNA
Thyroid nodule, TSH is normal/elevated - next investigation?
Thyroid USS
- FNA if suspicious ft on US
JBDS DKA criteria
glucose > 11 mmol/l (or known DM)
pH < 7.3
bicarbonate < 15 mmol/l
ketones >3, or dipstick ++
(JBDS) DKA - potassium replacement if K >5.5
None
(JBDS) DKA - potassium replacement if K 3.5 - 5.5
40 mmol/l
(JBDS) DKA - potassium replacement if K <3.5
Senior review
Screening for other disease, in known acromegaly
Regular colonoscopy, starting aged 40
Acromegaly 1st line management
Trans-sphenoidal surgery
Acromegaly 2nd line management
Best: Somatostatin analogue (octreotide) - inhibits GH release
Pegvisomant - GH receptor antagonist
Dopamine agonist (bromocriptine)
Drug causes of hypercalcaemia
Thiazides
Calcium-containing antacids
Lithium
Hypothyroidism monitoring in pregnancy
TSH each trimester, and 6-8 weeks post-partum
Thyroxine dose in pregnancy
Increase by 25-50% by weeks 4-6 of pregnancy.
Return to normal dose after delivery
Features of APS type 1 (MEDAC - multiple endocrine deficiency autoimmune candidiasis)
Need 2 out of 3:
- Addison’s
- Primary hypoparathyroidism
- Chronic mucocutaneous candidiasis
Features of APS type 2 (Schmidt’s syndrome)
Addison’s plus either:
- T1DM
- Autoimmune thyroid disease
APS type 1 genetic mutation
AIRE1 gene on chromosome 21
APS type 2 HLA linkage
HLA DR3/DR4
Primary hyperparathyroidism monitoring
Regular renal function, bone profile + DEXA scan
Type 2 DM + anti-GAD
LADA
Latent Autoimmune Diabetes of Adulthood
Liddle’s syndrome inheritence
AD
Liddle’s syndrome pathophysiology
Dysfunctional sodium channels in distal tubules -> increased sodium reabsorption
Liddle’s syndrome presentation
Hypertension
Metabolic alkalosis
Hypokalaemia
Low renin, low aldosterone
Teenager with symptomatic HTN
Liddle’s syndrome treatment
Amiloride or triamterene
Simone Broome criteria for familial hypercholesterolaemia - Definite FH
TC/LDL-C over threshold, plus:
Tendon xanthoma in patient/1st/2nd degree relative
Or
DNA evidence of FH
Simone Broome criteria - TC and LDL-C threshold in child <16
TC >6.7 mmol/L or LDL-C >4.0 mmol/L
Simone Broome criteria for familial hypercholesterolaemia - Possible FH
TC/LDL-C over threshold, plus:
MI <50 in 2nd degree relative,
MI <60 in 1st degree relative, or,
FH of raised cholesterol
Simone Broome criteria - TC and LDL-C threshold in adult
TC >7.5 mmol/L or LDL-C >4.9 mmol/L
Familial hypercholesterolaemia management
Referral specialist lipid clinic
High-dose statin
Screen first-degree relatives, by age of 10 (50% chance)
Calculated serum osmolarity
2Na + 2K + glucose + urea
Normal osmolar gap
<10
Osmolar gap
Measured osmolarity - calculated osmolarity
Treatment options for Graves’ disease
ATD titration (Carbimazole)
Block-and-replace (Carbimazole + thyroxine)
RAIA (radioactive ionine ablation)
Surgery
Definitive treatment options for Graves’ disease
RAIA and surgery
Contraindications to RAIA in Graves’
Pregnancy/trying to get pregnant
Age <16y
Thyroid eye disease
Thiamine
Vitamin B1
Rotterdam criteria for PCOS
At least 2 of:
- Clinical/biochemical evidence of hyperandrogenism
- Oligo- or anovulation
- Polycystic ovaries on US
Management of infertility in PCOS
Weight loss
Clomifene (+/- metformin)
Gonadotrophins
Management of hirsutism in PCOS
COCP (co-cyprindiol has anti-androgen action)
Topical eflornithine
Spironolactone/finasteride/flutamide
Screening for gestational diabetes - with any risk factors
OGTT at 24-28 weeks
Screening for gestational diabetes - previous gestational diabetes
OGTT as soon as possible after booking + at 24-28weeks
Diagnostic threshold for gestation diabetes - fasting glucose
> = 5.6 mmol/L
Diagnostic threshold for gestation diabetes - 2-hour glucose
> = 7.8 mmol/L
Gestational diabetes, fasting glucose >= 7 at time of diagnosis
Start insulin
Gestational diabetes - glucose targets not met with 1-2 weeks of diet/exercise
Start metformin
Gestational diabetes - glucose targets not met with diet/exercise/metformin
Start insulin
Gestational diabetes - plasma glucose 6 - 6.9 with evidence of macrosomia/hydramnios
Offer insulin
Pre-existing diabetes and pregnant
Weight loss if BMI >27
Stop PO hypoglycemics, apart from metformin, start insulin
Folic acid 5mg up to 12wk
Aspirin 75mg 12wk-delivery
Blood sugar target diabetes in pregnancy - Fasting
5.3 mmol/l
Blood sugar target diabetes in pregnancy - 1 hour after meal
7.8 mmol/l
Blood sugar target diabetes in pregnancy - 2 hour after meal
6.4 mmol/l
Type 1 (distal) RTA complications
Renal stones, nephrocalcinsis
Features of primary hyperaldosteronism
Hypertension
Hypokalaemia
Alkalsosis
Raised aldosterone: renin ratio
Management of bilateral adrenal hyperplasia
Spironolactone
Management of adrenal adenoma
Surgery
Investigation of hyperaldosteronism
High-resolution CT abdomen + Adrenal Vein Sampling
DVLA: Diabetics on insulin can hold an HGV licence as long as
- No severe hypo in last 12m
- Have hypo awareness
- 3-month evidence of regular glucose monitoring
- Understand risks of hypose
- No debarring complications
DVLA: Diabetics on insulin can drive a car as long as
- Have hypo awareness
- No more than 1 hypo requiring assistance in last 12m
- No visual impairment
Causes of Addisonian crisis
Sepsis/surgery triggering acute exacerbation of existing insufficiency
Adrenal haemorrhage (Waterhouse-Friderichsen syndrome in meningitis)
Steroid withdrawal
Causes of raised prolactin
prolactinoma pregnancy oestrogens stress, exercise, sleep acromegaly PCOS primary hypothyroidism
Drug causes of raised prolactin (dopamine-blockers)
Metoclopramide, domperidone
Haloperidol
Phenothiazines (prochlorperazine)
Rare: SSRIs, opioids
Subacute ‘De Quervains’ Thyroiditis on thyroid scintigraphy
Globally reduced uptake of iodine-131
Transient increase in hormone release, not over-production
Management of subacute/De Quervains Thyroiditis initial phase
Propranolol for symptoms
NSAIDs for thyroid pain
Steroids if severe
SIADH criteria
Na <135
Serum osmolality <271
Urine osmolality >100
Euvolemic
Management of congenital adrenal hyperplasia
Reverse circadian rhythm steroids
Features of hyperosmolar hyperglycaemic state
High osmolality + high glucose (>30)
Dehydration, unwell
No significant ketonaemia/acidosis
Indications for radioiodine therapy
Differentiated thyroid cancer
Toxic multinodular goitre
Refractory Graves disease
Test for adult growth hormone deficiency
Insulin tolerance test - demonstrates low peak GH levels in response to hypoglycaemia
Test for GH deficiency when ITT contraindicated
Arginine-GHRH stimulation test
CI to ITT
IHD
Previous seizures
Risk of rapid correction of HYPOnatraemia
Central pontine myelinolysis
Hyponatramia correction - aim in 24hr period
Raised Na levels by 4-6mmol/l in 24 hours
Visible features of pseudo-hypoparathyroidism type 1a
Short 4th and 5th metacarpals
Obesity
Biochemical findings in pseudo-hypoparathyroidism type 1a
High PTH, with low calcium, and high phosphate
Imaging for phaeochromocytoma
MIBG (metaiodobenzylguanidine) scan
24h urinary HIAA - screens for what
Carcinoid syndrome
Pentagastrin stimulation test - for which cancer
Medullary thyroid cancer
Definition of Stage 1 hypertension
Clinic BP > 140/90
and
ABPM daytime average/HBPM average > 135/85
Definition of Stage 2 hypertension
Clinic BP > 160/100
and
ABPM daytime average/HBPM average > 150/95
Definition of Severe hypertension
Clinic systolic BP >180 or diastolic BP >120
Treat Stage 1 hypertension if:
<80 years old with any of:
Target organ damage,
Established CD
Renal disease
QRISK >10%
Management of diabetes in cystic fibrosis
High calorie diet with insulin
Features of carcinoid syndrome
Diarrhoea Facial flushing Bronchospasm Hypotensions Right heart valvular stenosis
Prolactin level seen in prolactinoma
> 5000 mU/L
Prolactin level seen in non-prolactin secreting pituitary tumour
600 - 3000 mU/L
Ferritin levels seen in haemochromatosis
> 500 ug/L
1st line management of hyperphosphataemia in CKD
Start with dietary phosphate restriction, add in phosphate binder (calcium acetate) if needed
Target BP in diabetics/CKD
Aim BP < 130/80 with ACEi
Management of hyperphosphataemia in CKD, when calcium is raised
Non-calcium phosphate binder (Sevelamer)
Features of Bartter syndrome
Hypokalamic alkalosis
Normotensive
Muscle weakness/lethargy (due to low K)
Verner-Morrison syndrome (VMS)
Uncontrollable watery diarrhoea causing hypokalaemia and dehydration
Best screening test for acromegaly
IGF-1
Test for growth hormone deficiency
Insulin tolerance test
1st line management of solitary toxic thyroid nodule
Radioactive iodine therapy
Solitary toxic thyroid nodule - Indications for partial thyroidectomy
Thoracic obstruction
CI to radioiodine (planned pregnancy, young children)
T score representing osteopenia
-1.5 to -2.5
T score representing osteoporosis
Below -2.5
Feature of pseudohypoparathyroidism
High PTH
Low calcium, high phosphate
Short 5th digit
Initial management of nephrogenic diabetes insipidus (after stopping lithium)
Thiazide diuretic (Hydrochlorothiazide)
2nd line management of nephrogenic diabetes insipidus
Add amiloride or NSAID (indomethacin)
Treatment of cranial diabetes insipidus
Desmopressin
Alternate test for acromegaly
Glucose tolerance test, with growth hormone measurement (failure to suppress GH)
C282Y or H63D mutations in
Haemochromatosis
H1069Q mutation is seen in
Wilsons disease
C282Y or H63D mutations in
Haemochromatosis
H1069Q mutation in
Wilsons
Diagnostic test for phaeochromocytoma
24hr urinary metanephrines
Use for calcitonin
Hypercalcaemia
with rehydration +/- bisphosphonates