Endocrinology Flashcards
In what conditions can you not use HbA1C to diagnose T2DM?
Haemoglobinopathies
Haemolytic anaemia
Untreated iron deficiency anaemia
Gestational diabetes
Children
HIV
CKD
Medications causing hyperglycaemia
Alterations to metformin dose during ramadan
split dose to 1/3rd before sunrise and 2/3rds after sunset
Alteration to sulfonyulrea dose during ramadan
OD - take after sunset
BD - take large proportion after sunset
Dietary advice for T2DM during ramadan
Meal containing long acting carbohydrates prior to sunrise
Sick day rules for diabetes
Four hourly BMs
3 litres of fluid
May need sugary fluids if can’t drink
Continue normal insulin
Stop metformin if dehydrated
Continue oral hypoglycaemic meds
Conditions that need to be met to hold HGV licence if diabetic
No severe hypo in 12 months
Full hypo awareness
Adequate control shown by regular BMs
Understands risks of hypos
No other debarring conditions from diabetes
Conditions that need to be met to hold group 1 license if diabetic on insulin
Hypoglycaemic awareness
No hypo needing help in last 12 months
No relevant visual impairment
What is the target when treating hyperlipidaemia?
40% reduction in non-HDL cholesterol
Pre-diabetes range for HbA1c in mmol/mol
42-47
Non-drug causes of gynaecomastia
Physiological - normal in puberty
Androgen deficiency syndromes (Kallman, Klinefelters)
Testicular failure
Liver disease
Testicular cancer
Ectopic tumour secretion
Hyperthyroidism
Haemodialysis
Drug causes of gynaecomastia
Spironolactone
Cimetidine
Digoxin
Cannabis
Finasteride
GnRH agonists - goserelin, buserelin
Oestrogens, anabolic steroids
Orlistat - mechanism of action
Pancreatic lipase inhibitor
Orlistat - side effects
Faecal urgency
Incontinence
Flatulence
Criteria for starting orlistat
BMI over 28 with associated risk factors
BMI over 30
Criteria for continuing orlistat
Continued weight loss - 5% at 3 months
How long is orlistat used for?
1 year
TFTs in secondary hypothyroidism
Low TSH
Low T4
Investigations for secondary hypothyroidism
MRI pituitary
Cause of secondary hypothyroidism
Pituitary insufficiency
First line insulin regime for new T1DM
Basal bolus with twice daily insulin detemir
Pre-diabetes range for HbA1c in %
6.0-6.4%
Possible consequences of untreated subclinical hyperthyroidism
Supraventricular arrhythmias and osteoporosis
When do patients require a gradual withdrawal of systemic corticosteroids?
> 40mg pred daily for >1 week
> 3 weeks treatment
Recently received repeated courses
What ketones should prompt admission to hospital in T1DM?
3
Medication that interacts with orlistat
Contraception and anti-epileptics
due to GI side effects affecting absorption
At what renal function should you review metformin?
At what renal function should you stop stop metformin?
Review at creat >130 or eGFR <45
Stop if creat >150 or eGFR <30
Should you ever start metformin in prediabetes?
Yes if HbA1c going up despite lifestyle measures
Extra investigations for new T2DM diagnosed over age 60 or weight loss
CT abdomen to exclude pancreatic ca
Blood glucose targets in T1DM - on waking
5-7 mmol/l
Blood glucose targets in T1DM - before meals during the day
4-7 mmol/l
Which group of patients taking insulin do not need to inform DVLA?
Taking insulin for less than 3 months
Taking for gestational diabetes up to 3 months post partum
Which type of drugs reduced hypoglycaemia awareness?
Beta blockers
TSH goal in treating hypothyroidism
0.5 to 2.5 mU/l
Instructions to patients on how to take levothyroxine
30 minutes before breakfast or caffeine or other medication
Blood pressure target in T1DM with no end organ damage
135/85
Blood pressure target in T1Dm if albuminuria or 2 or more features of metabolic syndrome
130/80
Criteria for diagnosing T1DM
Fasting glucose ≥ 7
Random glucose ≥ 11.1
If not symptomatic needs to be on two occasions
Target HbA1c in T1DM
≤48
T1DM investigations
Urine dip
Fasting + random glucose
C-peptide
Anti-glutamic acid antibodies (anti-GAD)
Islet cell antibodies
Insulin autoantibodies
Insulinoma-associated-2 autoantibodies
Tests to do when differentiating between T1 and T2 diabetes
C-peptide
Insulin antibodies
What are the insulin antibodies to test for?
Anti-glutamic acid antibodies
Islet cell antibodies
Insulin autoantibodies
Insulinoma-associated-2 autoantibodies
HbA1c target for T2DM being managed with lifestyle measures
48
HbA1c target for T2DM being managed with lifestyle measures and metformin
48
HbA1c target for T2DM being managed with any drug that can cause hypoglycaemia
53
At what HbA1c do you add a second medication to metformin?
58
At what HbA1c do you start metformin?
48
2nd line medication options to add to metformin in the management of T2DM
Sulfonylurea
Gliptin
Pioglitazone
SGLT2 inhibitor
3rd line medication options to add to metformin in managmeent of T2DM
Sulfonylurea
Gliptin
Pioglitazone
SGLT2 inhibitor
OR consider insulin
Which medication should you continue when starting insulin in T2DM?
Metformin only
Medication options for T2DM who can’t tolerate metformin
Sulfonylurea
Gliptin
Pioglitazone
Start with 1, add 2nd if HbA1c ≥ 58
When to consider insulin in T2DM who can’t tolerate metformin?
After 2 drugs started and HbA1c rising to ≥ 58 or remains high
Dietary advice in T2DM
High fibre low GI carbs
Low fat dairy products
Oily fish
Reduce saturated fats + trans fats
Discourage diabetic foods
Target weight loss in T2DM
5-10%
Even if normal weight
When to start cholesterol medication in T2DM?
If 10 year cardiovascular risk score is >10% using QRISK 2
Primary prevention statin
Atorvastatin 20mg
Secondary prevention statin
Atorvastatin 80mg
BP targets in T2DM if age <80
clinic 140/90
ABPM 135/85
BP targets in T2DM if age >80
clinic 150/90
ABPM 145/85
First line treatment for hypertension in T2DM
ACEI or ARB
Use ARB if black/Caribbean
What will cause a lower than expected HbA1c?
Reduced red cell lifespan due to
- sickle cell anaemia
- GP6D deficiency
- hereditary spherocytosis
What will cause a higher than expected HbA1c?
Increased red cell lifespan due to
- Vit B12/folate acid deficiency
- iron deficiency anaemia
- splenectomy
Examples of SGLT-2 inhibitors
Canagliflozin
Dapagliflozin
Empagliflozin
What type of drug is canagliflozin?
SGLT2 inhibitor
What type of drug is dapagliflozin?
SGLT2 inhibitor
What type of drug is empagliflozin?
SGLT2 inhibitor
Mechanism of action of SGLT-2 inhibitors
Reversibly inhibit sodium-glucose cotransporter 2 in the renal PCT
to reduce glucose reabsorption and increase urinary glucose excretion
Side effects of SGLT-2 inhibitors
Urinary and genital infections
Fournier’s gangrene
Normoglycaemic ketoacidosis
Increased risk of lower limb amputation so need to monitor feet carefully
Examples of sulfonylureas
Gliclazide
Tolbutamide
What type of drug is gliclazide?
Sulfonylurea
What type of drug is tolbutamide?
Sulfonyulrea
Effect of SGLT-2 inhibitors on weight
Weight loss
Do SGLT-2 inhibitors cause hypoglycaemia?
Not by themselves
Mechanism of action of sulfonylureas
Increase pancreatic insulin secretion
Where in the pancreas do sulfonylureas work?
ATP dependent K+ channels on the cell membrane of pancreatic beta cells
to increase pancreatic insulin secretion
Side effects of sulfonylureas
Hypoglycaemia
Weight gain
SIADH
Bone marrow suppression
Cholestatic liver damage
Peripheral neuropathy
Effect of sulfonylureas on weight
Weight gain
Do sulfonylureas cause hypoglycaemia?
Yes
Which T2DM medication can cause liver damage?
Sulfonylureas cause cholestatic liver damage
Pioglitazone causes liver impairment, need to monitor LFTs
Example of thiazolidinediones
Pioglitazone
What type of drug is pioglitazone?
Thiazolidinedione
Mechanism of action of pioglitazone
Reduces peripheral insulin resistance
by agonising the PPAR-gamma receptor
Which T2DM medication reduces peripheral insulin resistance?
Pioglitazone
Side effects of pioglitazone
Weight gain
Liver impairment
Fluid retention so C/I in heart failure
Increased risk of fractures
Increased risk of bladder ca
Effect of pioglitazone on weight
Weight gain
Can pioglitazone cause hypoglycaemia?
Not when taken in isolation
Examples of meglitinides
Repaglinide
Nateglinide
What type of medication is repaglinide?
meglitinide, used in T2DM
What type of medication is nateglinide?
Meglitinide, used in T2DM
For which group of patients are meglitinides helpful?
Those with erratic lifestyles
Mechanism of action of meglitinides
Increase pancreatic insulin secretion
Side effects of meglitinides
Weight gain
Hypoglycaemia
Examples of rapid acting insulins
Aspart (novorapid)
Lispro (humalog)
Examples of short acting insulins
Actrapid
Humulin S
Examples of intermediate acting insulins
Isophane
Aspart protamine
lispro protamine
Examples of long acting insulins
Detemir (levemir)
Glargine (lantus)
Examples of GLP-1 mimics
Exenatide
Liraglutide
What type of drug is exenatide?
GLP-1 mimic
How is exenatide taken?
sub cut 60 minutes before morning and evening meal
How is liraglutide taken?
sub cut once daily
What type of drug is liraglutide?
GLP-1 mimic
Mechanism of action of GLP-1 mimics
Increase insulin secretion and inhibit glucagon secretion
Side effects of GLP-1 mimics
Nausea and vomiting
Renal impairment
Severe pancreatitis
Criteria for starting GLP-1 mimics
Triple therapy not effective AND one of:
BMI ≥ 35 + obesity related health problems
BMI <35 + insulin would cause occupational problems + weight related health conditions
Criteria for continuing GLP-1 mimics
Drop of 11 mmol/mol (1%) in HbA1c AND weight loss of 3% in 6 months
Effect of GLP-1 mimics on weight
Weight loss
Do GLP-1 mimics cause hypoglycaemia?
Not in isolation
Examples of DPP-4 inhibitors
Vildagliptin
Sitagliptin
What type of drug is vildagliptin?
DPP-4 inhibitor
What type of drug is sitagliptin?
DPP-4 inhibitor
What drug classification is generally referred to as gliptins?
DPP-4 inhibitors
Examples of gliptins
Vildagliptin
Sitagliptin
Mechanism of action of DPP-4 inhibitors/gliptins
Increase levels of incretins (GLP1 and GIP) by decreasing their peripheral breakdown
How are DPP-4 inhibitors/gliptins taken?
Orally
Impact of DPP-4 inhibitors/gliptins on weight
Weight neutral
Do DPP-4 inhibitors cause hypoglycaemia?
No
Two key causes of diabetic foot disease
Neuropathy
Peripheral artery disease
Screening for diabetic foot disease
Every year
Check for ischaemia by palpating pulses
Check for neuropathy using a 10g monofilament
Presentation of diabetic foot disease
Neuropathy
Ischaemia - absent foot pulses, intermittent claudication
Calluses
Ulceration
Charcot’s arthropathy
Cellulitis
Osteomyelitis
Gangrene
Diabetic foot disease - low risk
No risk factors except callus
Diabetic foot disease - moderate risk
1 of:
Deformity
Neuropathy
Non-critical limb ischaemia
Diabetic foot disease - high risk
Previous ulceration or amputation
on RRT
2 of: deformity, neuropathy, non-critical limb ischaemia
Inheritance of MODY
Autosomal dominance
Presentation of MODY
T2DM in patients <25y
FH of early onset diabetes
no ketosis at presentation
What does MODY stand for?
Maturity onset diabetes of the young
Where is prolacin secreted from?
Anterior pituitary gland
What is the primary prolactin releasing inhibitory factor?
Dopamine
Features of excess prolactin in men
Impotence
Loss of libido
Galactorrhoea
Features of excess prolactin in women
Amenorrhoea
Galactorrhoea
Causes of raised prolactin
Prolactinoma
Pregnancy
Physiological - stress, exercise, sleep
Acromegaly
PCOS
Primary hypothyroidism
Drugs
Drug causes of raised prolactin
Metoclopramide
Domperidone
Pheothiazines
Haloperidol
Which medication can be used to control galactorrhoea?
Bromocriptine
Features of metabolic syndrome
Elevated waist circumference Elevated triglycerides Reduced HDL Raised BP or on treatment for HTN Raised fasting glucose or T2DM
Raised uric acid
NAFLD
PCOS
Causes of thyrotoxicosis
Grave’s disease
Toxic multinodular goitre
Amiodarone
Acute phase of subacute thyroiditis, post partum thyroiditis or Hashimotos
Investigations of thyrotoxicosis
Low TSH
High T4
TSH receptor antibodies in Grave’s disease
Management of thyrotoxicosis
Propranolol
Carbimazole
Radioiodine treatment
Carbimazole mechanism of action
Reduces thyroid hormone production
Carbimazole side effects
Agranulocytosis
Can carbimazole be used in pregnancy?
in 2nd and 3rd trimester
Two regimes for using carbimazole
“antithyroid drug titration” start at 40mg then reduce till euthyroid
“block and replacement” carbimazole 40mg then add thyroxine when euthyroid
Side effects of radioiodine
May make thyroid eye disease worse
Majority will become hypothyroid requiring thyroxine within 5 years
Antibodies in Grave’s disease
TSH receptor stimulating antibodies in 90%
Anti-thyroid peroxidase antibodies in 75%
Grave’s specific findings
Thyroid eye disease
Pretibial myxodemea
Thyroid acropachy
What is thyroid acropachy?
Digital clubbing
Soft tissue swelling in hands and feet
Periosteal new bone formation
How many with Grave’s disease get thyroid eye disease?
25-50%
Risk factors for thyroid eye disease
Smoking
Radioiodine
Features of thyroid eye disease
Exophthalmos Conjunctival oedema Optic disc swelling Ophthalmoplegia Risk of exposure keratopathy
Management of thyroid eye disease
Topical lubricants to prevent corneal inflammation
Steroids
Radiotherapy
Surgery
What is toxic multinodular goitre?
Autonomously functioning thyroid nodules that secrete excess thyroid hormone
Causes of hypothyroidism
Hashimoto’s thyroiditis
Subacute thyroiditis (de Quervian’s)
Iodine deficiency
Post partum thyroiditis
Reidel thyroiditis
Drugs - lithium, amiodarone, carbimazole
When to have a lower starting dose for levothyroxine?
Age >50
History of ischaemic heart disease
Goal of levothyroxine treatment
Normal TSH
Side effects of levothyroxine
Hyperthyroidism
Reduced bone mineral density
Angina
AF
Interactions to levothyroxine
Iron, calcium carbonate
Reduce absorption therefore give 4 hours apart
TFTs in primary hypothyroidism
Raised TSH, Low T4
TFTs in secondary hypothyroidism
Low TSH, Low T4
TFTs in sick euthyroid syndrome
Low TSH, Low T4
Cause of low TSH and low T4
Secondary hypothyroidism
Sick euthyroid syndrome
TFTs in subclinical hypothyroidism
Raised TSH, normal T4
TFTs in poor thyroxine compliance
Raised TSH, normal T4
Cause of raised TSH and normal T4
Subclinical hypothyroidism
Poor thyroxine compliance
Cause of raised TSH and low T4
Primary hypothyroidism
What is Reidel thyroiditis?
Fibrous tissue replacing normal thyroid parenchyma
Features of Reidel thyroiditis
Painless goitre, hard, fixed
Middle aged women
Associated with retroperitoneal fibrosis
Drug causes of hypothyroidism
Lithium
Amiodarone
Antithyroid drugs e.g. carbimazole
What is Hashimoto’s thyroiditis?
Chronic autoimmune thyroiditis causing hypothyroidism
May have a transient thyrotoxicosis
Is there a goitre in Hashimoto’s thyroiditis?
Firm, non-tender goitre
Associations with Hashimoto’s thyroiditis
Coeliac
T1DM
Vitiligo
MALT lymphoma
Investigations for Hashimoto’s thyroidits
Raised TSH low T4
Anti-thyroid peroxidase antibodies
Anti-thyroglobulin antibodies
Is there a goitre in Subacute thyroidits?
Painful goitre
Presentation of subacute thyroidits
After viral infection
Initially hyperthyroid, then euthyroid, then hypothyroid
Management of subacute thyroidits
Self limiting
Asprin and NSAIDs for thyroid pain
Steroids in severe cases
Changes to thyroxine dose in pregnancy
Increase up to 50% by 4-6 weeks
Is thyroxine safe in pregnancy and breastfeeding?
Yes
Thyrotoxicosis management in 1st trimester
Propylthiouracil
Thyrotoxicosis management in 2nd and 3rd trimester
carbimazole
What level do you maintain maternal thyroxine levels at during pregnancy?
Upper 3rd of normal to avoid fetal hypothyroidism
Why do we change thyrotoxicosis management during pregnancy?
Carbimazole increases risk of congenital abnormality
Propylthiouracil has increased risk of hepatic injury
Causes of thyrotoxicosis during pregnancy
Grave’s disease
Transient gestation hyperthyroidism - activation of TSH receptor by HCG
What complications can thyrotoxicosis cause during pregnancy?
Increased risk of fetal loss
Maternal heart failure
Premature labour
Causes of primary hypoadrenalism
Addison’s disease
TB
Metastases e.g. bronchial carcinoma
Waterhouse-Friderichsen syndrome
HIV
Causes of secondary hypoadrenalism
Pituitary disorders e.g. tumours, irradiation, infiltration
What is Bartter’s syndrome?
Inherited cause of hypokalaemaia
due to defective chloride absorption at the Na/K/Cl cotransporter in the ascending LoH
Inheritance of Bartter’s syndrome
Autosomal recessive
Features of Bartter’s syndrome
Normotension
Hypokalaemia
FTT
Polyuria, polydipsia
Drugs causing gynaecomastia
Spironolactone Cimetidine Digoxin Cannabis Finasteride GnRH agonists - goserelin Oestrogen, steroids
Two key causes of hypercalcaemia
Primary hyperparathyroidism
Malignancy - bone mets, myeloma, squamous cell lung ca
Causes of hypercalcaemia
Primary hyperparathyroidism Malignancy Sarcoidosis Vit D toxicity Acromegaly Milk-alkali syndrome Addison's
Drugs causing hypercalcaemia
Thiazides
Calcium containing antacids
Causes of hypoglycaemia
Insulinoma Insulin/Sulphonylureas liver failure Addison's Alcohol Nesidioblastosis - beta cell hyperplasia
Treatment of hypoglycaemia
10-20g oral glucose
Glucogel
Glucagon
Investigations to confirm Cushing’s syndrome
Overnight dexamethasone suppression test
24 hour urinary free cortisol
Management of pheochromocytoma
Stabilise medically then surgery
Alpha blocker first - phenoxybenzamine
Then beta blocker - propranolol
What is a pheochromocytoma?
Rare catecholamine secreting tumour
Features of phaeochromocytoma
Episodic HTN Headaches Palpitations Sweating Anxiety
Investigations for phaeochromocytoma
24 hour urinary collection of metanephrines
What is carcinoid syndrome?
When metastases present in the liver and release serotonin into systemic circulation
Can also occur with lung carcinoid
Investigations for carcinoid tumours
Urinary 5-HIAA
Plasma chromogranin A Y
Management of carcinoid tumours
Somtatostatin analogues - ocreotide
Cyproheptadine may help with diarrhoea
What is pituitary apoplexy?
Sudden enlargement of pituitary tumour secondary to haemorrhage or infarction
Criteria for diagnosing DKA
Glucose >11 or known diabetic
pH <7.3
Bicarb <15
Ketones >3
What is neuroblastoma?
Common childhood malignancy arising from the neural crest tissue of adrenal medulla and sympathetic nervous system
Symptoms of neuroblastoma
Abdo mass Pallor Weight loss Bone pain, limp Hepatomegaly Paraplegia Proptosis
Investigations for neuroblastoma
Raised urinary VMA and HVA levels
Calcification on abdo xray
Biopsy
Phaeochromocytoma associations
MEN type II
Neurofibromatosis
Von Hippel-Lindau syndrome
What is a prolactinoma?
Pituitary adenoma which produces an excess of prolactin
Management of prolactinoma
Medically - dopamine agonists (cabergoline bromocriptine)
Surgery if meds not tolerated
Examples of dopamine agonists
Bromocriptine
Cabergoline
What type of drug is bromocriptine?
Dopamine agonist
What type of drug is cabergoline?
Dopamine agonist
Features of hypoparathyroidism
Paraesthesia Oral numbness Facial twitching Muscle spasm Bone pain Depression, confusion Cataracts Seizures
Signs of hypoparathyroidism
Chvostek’s sign
Trousseau’s sign
ECG in hypoparathyroidism
Prolonged QTc
Management of hypoparathyroidism
Severe = IV calcium Mild/mod = oral calcium + vit D
Primary hypoparathyroidism causes
Reduced PTH secretion e.g. secondary to thyroid surgery
Primary hypoparathyroidism - investigations
Low calcium
High phosphate
Low/inappropriately normal PTH
Primary hypoparathyroidism - management
Alfacalcidol
Pseudohypoparathyroidism - investigations
Low calcium
High phosphate
High PTH
Pseudohypoparathyroidim - features
Low IQ
Short stature
Shortened 4/5th metatarsals
What is pseudohypoparathyroidism?
Inadequate response to PTH, normal amount of PTH
What is pseudopseudohypoparathyroidism?
Same phenotype as pseudohypoparathyroidism but normal biochemistry
Primary hyperparathryoidism - causes
Solitary adenoma (80%)
Hyperplasia
Multiple adenoma
Carcinoma
Primary hyperparathryoidism - who is typically affected?
Elderly women
Thirsty
With normal or raised PTH
Primary hyperparathryoidism - associations
Hypertension
MEN I and MEN II
Primary hyperparathryoidism - investigations
Raised calcium
Low phosphate
PTH raised or inappropriately normal
Xray: pepperpot skull
Primary hyperparathryoidism - features
Polydipsia, polyuria Peptic ulcer Constipation Pancreatitis Bone pain or fractures Renal stones Depression Hypertension
Secondary hyperparathyroidism - causes
Any disorder causing hypocalcaemia will elevate PTH and cause secondary hyperparathyroidism
CKD
Malabsorption e.g. crohns, coeliac, chronic pancreatitis
Chronic inadequate sunlight
Secondary hyperparathyroidism - investigations
Raised calcium
Raised PTH
Secondary hyperparathyroidism - management
Reduce serum phosphate
Boost dietary calcium
What is tertiary hyperparathyroidism?
Parathyroid glands develop autonomous function in patients with long standing secondary hyperparathyroidism
Management = subtotal parathyroidectomy
Features of MEN I
Hyperparathyroid secondary to hyperplasia
Pituitary tumour
Insulinoma
Gastrinoma causing recurrent peptic ulcer
Most common presentation of MEN I
Hypercalcaemia
Features of MEN IIa
Medullary thyroid cancer
Parathyroid tumours
Phaeochromocytoma
Features of MEN IIb
Medullary and thyroid cancer
Phaeochromocytoma
Marfanoid body habitus
Neuromas
Key features of Kallman’s syndrome
Ansomnia
Delayed puberty
Hypogonadism
Cleft lip/palate
Key features of Klinefelter’s syndrome
Tall Infertile Small testes Lack secondary sexual characteristics Gynaecomastia
Key features of androgen insensitivity syndrome
Primary amenorrhoea
Groin swellings from undescended testes
Hormones in testosterone secreting tumour
LH low
Testosterone high
Hormones in androgen insensitivity syndrome
LH high
Oestrogen high
Testosterone high
Inheritance of androgen insensitivity syndrome
X linked recessive
Key features of 5-alpha reductase deficiency
Males unable to convert testosterone
Ambiguous genitalia at birth
Hypospadias
Virilisation at puberty
Hormones in Kallman’s syndrome
LH low
FSH low
Testosterone low
Inheritance of Kallman’s syndrome
X linked recessive
Hormones in Klinefelter’s syndrome
LH high
FSH high
Testosterone low
What is primary hyperaldosteronism?
Excess production of aldosterone
Primary hyperaldosteronism - causes
Bilateral idiopathic adrenal hyperplasia
Adrenal adenoma (Conn’s syndrome)
Adrenal carcinoma
Primary hyperaldosteronism - features
HTN Hypokalaemia Muscle weakness Polyuria, polydipsia Alkalosis
Primary hyperaldosteronism - investigations
Low potassium Low renin, high aldosterone Aldosterone: renin ratio high CT abdomen Adrenal vein sampling - if one side has high aldosterone then adenoma likely
When to consider Conn’s syndrome?
Hypertension with hypokalaemia
Refractory hypertension
Hypertension <40 years
Primary hyperaldosteronism - management of bilateral idiopathic adrenal hyperplasia
Aldosterone antagonist e.g. spironolactone
Example of an aldosterone antagonist
Spironolactone
What type of drug is spironolactone?
Aldosterone antagonist
Management of Conn’s syndrome
surgical excision
Causes of primary adrenal insufficiency
Addison’s
Congenital adrenal hyperplasia
Waterhouse-Friederichsen syndrome
Causes of secondary adrenal insufficiency
Exogenous steroids
Sheehan’s syndrome
Features of adrenal insufficiency
Fatigue Dehydration N+V Salt craving Hyperpigmentation Postural hypotension
Features of adrenal crisis
Collapse
Shock
Pyrexia
Investigations of adrenal insufficiency
Low sodium High potassium
Low aldosterone High renin
Hypoglycaemia
ACTH - high in primary, low in secondary
ACTH stimulation test
CT adrenals
Causes of acute adrenal insufficiency
Infection Trauma Surgery Missed medication Waterhouse-Friderichsen syndrome
Management of acute adrenal insufficiency
IV fluids
100mg IV hydrocortisone
Dextrose if hypoglycaemic
What is Addison’s disease?
Autoimmune destruction of the adrenal glands
Causes primary adrenal insufficiency
Investigations for Addison’s disease
Low sodium High potassium
ACTH stimulation test
Random cortisol at 9am
Management of Addison’s disease
Hydrocortisone - in 2 or 3 divided doses
Fludrocortisone
Addison’s disease - sick day rules
Double hydrocortisone
Keep fludrocortisone the same
Causes of Cushing’s syndrome
ACTH dependent:
- Cushing’s disease
- Ectopic ACTH secreting tumours
ACTH independent:
- exogenous steroids
- adrenal adenoma
- adrenal carcinoma
What is Cushing’s diseaes?
Pituitary tumour secreting ACTH causing adrenal hyperplasia
What is pseudocushings?
Cushings caused by alcohol, depression, HIV, diabetes
Insulin stress test to differentiate from Cushing’s
Investigations to confirm Cushing’s
24h urinary free cortisol >3x upper limit of normal
1mg overnight dexamethasone suppression test
Late night cortisol
What is acromegaly?
Excess growth hormone secretion
Causes of acromegaly
Pituitary adenoma in 95%
Ectopic GHRH
GH production by tumours e.g. pancreatic
Acromegaly - investigations
Raised glucose, phosphate, calcium, TAG
IGF-1
Oral glucose tolerance test to confirm raised IGF-1
MRI pituitary + hypothalamus
Management of acromegaly
Trans-sphenoidal surgery
Somatostatin analogues - ocreotide
Dopamine agonists - cabergoline
Complications of acromegaly
HTN
Diabetes
Cardiomegaly
Colorectal cancer
Who should get primary prevention with statins?
High risk of cardiovascular disease with 10 year risk >10%
How do we calculate cardiovascular risk?
QRISK2
Which patient groups can we not use QRISK2 on?
T1DM
eGFR <60 or albuminuria
History of familial hyperlipidaemia
When to investigate for familial hypercholesterolaemia
Total cholesterol >7.5
Family history of premature coronary heart disease
Refer if total cholesterol >9.0 or LDL >7.5 even with no family history
When to offer statins to T1DM?
Older 40
Diabetes for >10 years
Nephropathy
Other CVD risk factors
Prescribing statins to CKD patients
All CKD patients should get atorvastatin 20mg
Increase dose if greater than 40% reduction in non-HDL cholesterol not achieved and eGFR >30
When to follow up patients who have been started on a statin?
3 months
Goal of statin therapy
Reduce non-HDL cholesterol by 40%
If hasn’t met this then increase atorvastatin to 80mg
Goal for physical activity
150 minutes moderate intensity aerobic activity or 75 minutes vigorous intensity
Muscle strengthening activities on 2 days
Who should get atorvastatin for primary prevention?
QRISK2 >10%
most T1DM
CKD if eGFR <60
Consequence of vitamin A deficiency
Night blindness
Consequence of vitamin B1 deficiency
‘Beriberi’
Polyneuropathy
Wernicke-Korsakoff
Heart failure
Consequence of vitamin B3 deficiency
‘Pellagra’
Dermatitis
Diarrhoea
Deficiency
Which vitamin is folic acid?
B9
Which vitamin is niacin?
B3
Which vitamin is thiamine?
B1
Consequence of vitamin C deficiency
Scurvy
Gingivitis
Bleeding
Which vitamin is ascorbic acid?
C
Which vitamin is cyanocobalamin?
B12
Consequence of vitamin K deficiency
Haemorrhagic disease of the newborn
Inheritance of familial hypercholesterolaemia
Autosomal dominant
Statins and pregnancy
Discontinue 3 months before conception due to risk of congenital defects
For which patient groups does QRISK2 underestimate cardiovascular risk?
HIV
Serious mental health problems
Drugs causing dyslipidaemia e.g. antipsychogics, steroids, immunosupressants
Autoimmune or inflammatory disorders
Foods high in potassium
Salt substitutes Bananas Oranges Kiwi Avocado Spinach Tomatoes
Causes of hypokalaemia with hypertension
Cushing’s syndrome
Conn’s syndrome
Liddle’s syndrome
Causes of hypokalaemia without hypertension
Diuretics GI loss Renal tubular acidosis Bartter's syndrome Gitelman syndrome
Hyperkalaemia - ECG changes
tall tented T waves
small P waves
Widened QRS
Causes of predominantly hypercholesterolaemia
Nephrotic syndrome
Cholestatis
Hypothyroidism
How does ezetimibe work?
Decreases cholesterol absorption in the small intestine
Management of SIADH
Fluid restrict
Demeclocycline
First line management for diabetic neuropathy
Amitriptyline
Duloxetine
Gabapentin
Pregabalin
Management gastroparesis in diabetics
Metoclopramide
Domperidone
Erythromycin