Endocrine to work on Flashcards
Give 2 causes of primary hyperparathyroidism
- Parathyroid adenoma
- Hyperplasia
- Parathyroid cancer
what are the clinical features of hypoparathyroidism?
SYMPTOMS: CATs go numb 1. convulsions / seizures 2. arrhythmias / anxious 3. tetany / muscle spasms 4. numbness
SIGNS:
- CHVOSTEK’S SIGN - tap over facial nerve and look for spasm of facial nerves
- TROUSSEAU’S SIGN - inflate BP cuff 20 mmHg above systolic for 5 mins = hand spasm - hypocalcaemia
what are the signs of hypoparathyroidism?
- CHVOSTEK’S SIGN - tap over facial nerve and look for spasm of facial nerves
- TROUSSEAU’S SIGN - inflate BP cuff 20 mmHg above systolic for 5 mins = hand spasm - hypocalcaemia
what is chvostek’s sign?
sign of hypoparathyroidism
tap over facial nerve and look for spasm of facial nerves
what is trousseau’s sign?
sign of hypoparathyroidism
inflate BP cuff 20 mmHg above systolic for 5 mins = hand spasm
what are the causes of hypoparathyroidism?
- secondary to increased serum phosphate
- severe vitamin D deficiency
- reduced PTH function
- drugs - calcitonin, bisphosphonates
Give 2 ECG changes that you might see in someone with hypercalcaemia
- Tall T waves
2. Shortened QT interval
Name 3 causes of hypocalcaemia
Hypoparathyroidism Vitamin D deficiency Hyperventilation Drugs Malignancy Toxic shock
Give 2 ECG changes that you might see in hypocalcaemia?
- Small T waves
2. Long QT interval
what are the clinical features of diabetic ketoacidosis?
SIGNS
- Breath smells of pear drops (ketones)
- Kussmaul’s breathing - deep, rapid breathing
- Tachycardia
- Hypotension
- Reduced tissue turgor
SYMPTOMS
- Nausea and vomiting
- Dehydration
- exacerbated by vomiting
- Weight loss
- Drowsy/confused
- Abdominal pain
Give 3 endocrine diseases that can cause diabetes
- Cushing’s
- Acromegaly
- Phaeochromocytoma
Describe the treatment pathway for T2DM
- Lifestyle changes - lose weight, exercise, healthy diet and control of contributing conditions
- Metformin
- dual therapy of Metformin + one of the following:
i) DPP4 inhibitor
ii) sulphonylureas (gliclazide)
iii) pioglitazone - triple therapy
- insulin
How does metformin work in treating T2DM?
Increase insulin sensitivity and inhibits glucose production
How does sulfonylurea work in treating T2DM?
Stimulates insulin release
block ATP dependent K+ channels in beta cells -> causes depolarisations and opening of voltage gated Ca2+ channels -> stimulates insulin secretion
what are the side effects of Sulfonylurea?
Hypoglycaemia
weight gain
hyponatraemia
Name 5 possible diseases of the pituitary
- Benign pituitary adenoma
- Craniopharygioma
- Trauma
- Apoplexy/Sheehans
- Sarcoid/TB
What complications are associated with acromegaly?
type 2 diabetes
sleep aponea
heart disease
arthritis
What are the investigations for acromegaly?
1st line = IGF-1
2nd line = oral glucose tolerance test
3rd line = pituitary function tests
4th line = MRI
what are the causes of Addison’s disease?
- autoimmune destruction (21-hydroxylase present in 60-90%) - most common in developed countries
- TB - most common in developing countries
- adrenal metastases- long term steroid use
What are the investigations for Addison’s disease?
- SynACTHen test = giving synthetic ACTH does not increase cortisol levels
- Serum electrolytes = low Sodium, high Potassium
- FBC: Anaemia and eosinophilia
- Morning serum cortisol = Reduced
- Adrenal CT or MRI
what are the features of addisonian crisis?
Vomiting abdominal pain profound weakness hypoglycaemia hypovolemic shock
What is the management of adrenal crisis?
Immediate IV Hydrocortisone
Fluid resuscitation - saline (IV)
what is the clinical presentation of grave’s dermopathy?
Pretibial myxoedema – raised, purple red symmetrical skin lesions over anterolateral aspects of shin
Thyroid acropachy – clubbing, swollen fingers and periosteal bone formation
what is pretibial myxoedema?
raised, purple red symmetrical skin lesions over anterolateral aspects of shin
what is thyroid achropachy?
clubbing, swollen fingers and periosteal bone formation
Name 5 risk factors for Graves disease
- Female
- Genetic association
- E.coli
- Smoking
- Stress
- High iodine intake
- Autoimmune diseases
Name 5 autoimmune diseases associated with thyroid autoimmunity
- T1DM
- Addison’s disease
- Pernicious anaemia
- Vitiligo
- Alopecia areata
- Rheumatoid arthritis
Name 4 types of sporadic non toxic goitre
- Diffuse –> physiological –> Graves
- Multi nodular
- Solitary nodule
- Dominant nodule
what are the causes of hyperthyroidism?
- Grave’s disease
- Toxic multinodular goitre
- Solitary toxic nodule/adenoma - benign
- De Quervarians thyroiditis
- Postpartum thyroiditis
- Drug induced
Name 4 drugs which can induce hyperthyroidism
- Iodine
- Amiodarone
- Lithium
- Radioconstrast agents
What are the 4 main treatments for hyperthyroidism?
- Beta blockers - PROPRANOLOL
- Anti-thyroid drugs - CARBIMAZOLE
- Radioiodine
- Surgery - partial/total thyroidectomy
Give 5 side effects of anti-thyroid drugs
- Rash
- Arthralgia
- Hepatitis
- Neuritis
- Vasculitis
- Agranulocytosis - very serious
Briefly explain thyroid crisis/storm
Rapid deterioration of thyrotoxicosis
Hyperpyrexia, tachycardia and extreme restlessness Delirium –> coma –> death
What is the treatment for a thyroid crisis?
Large doses of oral carbimazole, oral propranolol, oral potassium iodide and IV hydrocortisone
Name 4 causes of primary hypothyroidism
- autoimmune thyroiditis
- postpartum thyroiditis
- iatrogenic
- drug induced
- iodine deficiency
- congenital
Give 2 examples of iatrogenic causes of hypothyroidism
- Thyroidectomy
2. Radioiodine therapy
Name 4 drugs that can cause hypothyroidism
- Carbimazole (used to treat hyperthyroidism)
- Amiodarone
- Lithium
- Iodine
Name 3 triggers of Hashimoto’s thyroiditis
- Iodine
- Infections
- Smoking
- Stress
what are the complications of Hashimoto’s thyroiditis?
hyperlipidaemia
Hashimoto’s encephalopathy
what are the clinical features of DI?
SYMPTOM
- Polyuria
- Polydipsia
- No glycosuria
SIGNS
- Dry mucosa
- Sunken eyes
- Changes in skin turgidity
- Can lead to dehydration
- Hypernatremia
what are the causes of cranial DI?
Idiopathic Congenital defects in ADH gene Disease of hypothalamus Tumour – metastases, posterior pituitary Trauma – neurosurgery Infiltrative disease
what are the causes of nephrogenic DI?
- Hypokalaemia
- Hypercalcaemia
- Drugs
- lithium chloride
- Demeclocycline
- glibenclamide - Renal tubular acidosis
- Sickle cell disease
- Prolonged polyuria of any cause
- Familial (mutation in ADH receptor)
Give 3 possible differential diagnosis’s of DI
- DM
- Hypokalaemia
- Hypercalcaemia
What is the treatment for nephrogenic DI?
- treat cause
- thiazide diuretics - (BENDROFLUMETHIAZIDE) - Produces hypovolaemia which will encourage the kidneys to take up more Na+ and water in proximal tubule
- NSAIDs - IBUPROFEN - Lower urine volume and plasma Na+ by inhibiting prostaglandin synthase. Prostaglandins locally inhibit the action of ADH
What is the treatment for cranial DI?
- Treat underlying condition
- Thiazide diuretics (BENDROFLUMETHIAZIDE) - sensitise renal tubules to endogenous vasopressin
- DESMOPRESSIN - high activity at V2 receptor
Give 4 causes of polyuria
- Hypokalaemia
- Hypercalcaemia
- Hyperglycaemia
- Diabetes insipidus
what are the clinical features of SIADH?
SYMPTOMS: Nausea and vomiting Headache Lethargy Cramps Weakness Confusion / irritability
SIGNS
raised JVP
oedema
ascites
what are the causes of SIADH?
brain injury infection hypothyroidism cancers lung diseases
what are the investigations for SIADH?
- ADH levels
- U and Es (low sodium normal potassium),
- fluid status
distinguish SIADH from salt & water depletion - test with 1-2L of
0.9% saline:
• Sodium depletion will respond
• SIADH will NOT RESPOND
Describe the treatment for SIADH
- Restrict fluid - <1L/day
- Give salt
- Loop diuretics - furosemide
- Demeoclocycline - inhibitor of ADH
- ADH-R antagonists - vaptans - primate water excretion with no loss of electrolytes