CH6: ENDO CLINICAL Flashcards
what is diabetes insipidus & its symptoms
- large amounts of diluted urine produced
- excessive thirst
symptoms
- polyuria
- polydipsia
Types of diabetes insipidus
- Cranial diabetes insipidus = not enough ADH (vasopressin) is produced by the hypothalamus
- Nephrogenic diabetes insipidus = kidney’s do not respond to ADH
diagnosis of cranial diabetes insipidus
producing concentrated urine after IM/intranasal desmopressin
treatment for cranial diabetes insipidus
desmopressin/vasopressin and restriction of fluid intake
treatment of partial pituitary diabetes insipidus
- carbamazepine (UL) - sensitise the renal tubules to the vasopressin
- thiazides can be used (indapamide)
diagnosis of nephrogenic diabetes insipidus
failure to produce concentrated urine after IM/intranasal desmopressin
treatment of nephrogenic diabetes insipidus
thiazide diuretics = to reduce urine output
what is hyponatraemic convulsions & how can we minimise its risk
- too much ADH secretions are produced
- minimise risk
-> fluid-intake restriction
-> stopping desmopressin during D/V = until the fluid balance is restored
-> avoiding any meds that increase vasopressin secretions = paracetamol, nicotine and tricyclics
elderly risk of hyponatraemic convulsions, what monitoring parameters to take?
monitor
- initial Na baseline
- then regular monitoring of serum Na levels
- STOP if Na levels are below baseline
can pregnant women taken desmopressin?
yes, but not in their 3rd trimester, as it increases the risk of pre-eclampsia
if pt has hyponatraemia or increased in ADH concentration and is not corrected by fluid restriction, what treatment would you suggest?
ADH antagonists (tolvaptan, demeclocycline)
aim is to block the renal tubular effect of ADH
what is adrenal cortex
secretes cortisol (glucocorticoid & some mineralocorticoid activity)
AND aldosterone (mineralocorticoid activity)
High mineralocorticoid activity what does this mean & give a drug example
High mineralocorticoid activity = MORE fluid retention
e.g. fludrocortisone
High glucocorticoid activity what does this mean & give a drug example
High glucocorticoid activity = high anti-inflammatory effect = LOW fluid retention
example; dexamethasone, betamethasone
name a corticosteroid drug that is appropriate for heart failure?
dexamethasone & betamethasone
- as it does NOT cause fluid retention
what are the monitoring parameters for all corticosteroids
- Lipid
- Blood pressure
- Serum potassium
- Bone mineral density
- Blood glucose
- Eye examination
- Body weight and height in children
What is the MHRA alert for methylprednisolone use
- to avoid use in pts allergic to cow’s milk
- reported symptoms of bronchospasm and anaphylaxis
how to avoid abrupt withdrawal of corticosteriods
issue steriod cards
- prolonged treatment > 3 weeks at any dose
- > 40mg of prednisolone or equivalent dose > 1 week
- repeat doses in the evening
- recent repeat rx
- short courses with 1 year of stopping long term steriod
- if pt has nay other cause of adrenal suppression
what are the causes of adrenal insufficiency
- addison’s disease
- congenital adrenal hyperplasia
name 3 conditions that adrenal replacement therapy
- Addison’s disease
- Cushing syndrome
- Hypopituitarism
what is addison’s disease & its treatment
- low cortisol & low aldosterone levels
treatment
- hydrocortisone + fludrocortisone (PO)
- large dose = AM and small dose = PM ; to mimic the biologic rhythms
what is hypopituitarism
pituitary gland does not respond to the hormone secretion due to the LOW cortisol levels.
treatment
- IV hydrocortisone
- Replacement for necessary hormones;
what is hypopituitarism
the pituitary gland does not respond to the hormone secretion due to the LOW cortisol levels.
treatment
- IV hydrocortisone
- Replacement for necessary hormones; growth hormones, sex hormones and thyroid hormones
symptoms of cushing’s syndrome
- moon face
- red/purple striae (stretch marks)
- bruising
- buffalo hump
- muscle wasting/thin extremities
- weight & obesity
- skin and bone thinning
- menstrual changes
- low libido
- hirsutism (excessive hair growth)
- osteoporosis
- growth suppression in children
what is cushing syndrome and its causes
excessive cortisol levels caused by
- tumour
- prolonged use of glucocorticoid drug treatments
treatment of cushing’s syndrome if it is caused by a tumour
cortisol inhibiting drugs;
1. Ketoconazole
2. Metyrapone
treatment of Cushing’s syndrome if it is caused by excessive use of glucocorticoid drug treatments
- reduce dose
- withdraw treatment - gradually
what are the risk factors for osteoporosis
- smoking
- 65+ (over 50 for male)
- low body weight
- lack of exercise
- menopause (if early)
- excess alcohol
- family history
- long-term use of corticosteroids (oral)
- vitamin D/ Ca deficiency
non-pharmacological advice to minimise the risk of osteoporosis if pt has risk factors
- vitamin D/Ca2+ supplements
- increase exercise & diet
- reduce the dose of corticosteroids and maintain the shortest course
what are the different types of osteoporosis
- corticosteriod induced osteoporosis
- menopausal-induced osteoporosis
- male osteoporosis
first-line treatment for corticosteroid-induced osteoporosis
Oral bisphosphonates (alendronic acid or risedronate)
second-line treatment for corticosteroid-induced osteoporosis
zoledronic acid (IV), denosumab, teriparatide
first-line treatment for post menopausal-induced osteoporosis
Oral bisphosphonates (alendronic acid or risedronate)
second-line treatment for post-menopausal-induced osteoporosis
ibradronic acid
strontium
denosumab
raloxifene
IV bisphosphonate
severe treatment for post-menopausal-induced osteoporosis
teriparatide
add-on therapy for post-menopausal-induced osteoporosis
HRT
Tibolone (for younger menopausal women)
when should you review use of bisphosphonates
after 5 years
3 years for zoledronic acid
for corticosteroid-induced osteoporosis when would you consider starting prophylaxis? (in women)
start prophylaxis when starting corticosteroid treatment
(women)
- >70y/o +
- previous fragility fracture
- large doses of glucocorticoid >7.5mg of prednisolone
for corticosteroid-induced osteoporosis when would you consider starting prophylaxis? (in males)
start prophylaxis when starting corticosteroid treatment
(male)
- >70y/o +
- previous fragility fracture
- large doses of glucocorticoid >7.5mg of prednisolone
for corticosteroid-induced osteoporosis what other incident would you consider starting prophylaxis?
taking large doses of glucocorticoid >3 months
treatment for bone metastases in breast ca/severe hypercalcemia in malignancy
- pamidronate (IV)
- zolendronic acid (IV)
very potent
potential doses for risedronate for the prevention/treatment of osteoporosis
5mg OD
35mg once WEEKLY
potential doses for alendronic acid for the prevention/treatment of osteoporosis
10mg OD
70mg once WEEKLY
HRT for post-menopause
tibolone
HRT for peri- and post-menopause
oestrogen
what is HRT used for
- oestrogen-only or combined HRT (oestrogen + progestogen
- given to alleviate symptoms of post-menopause = vaginal atrophy, reduce risk of osteoporosis and vasomotor instability
MHRA alert of HRT
- only to be used to alleviate post-menopausal symptoms if it is affecting the patient’s quality of life.
- use the lowest effective dose and at the shortest duration
- use of HRT = increased risk of breast cancer, advice to attend regular breast routines
symptoms & treatments for menopause
- Vaginal dryness/atrophy = topical oestrogen (cream, vaginal tabs/rings)
- Vasomotor symptoms (hot flushes/ night sweats) = systemic oestrogen (tabs/patches = increases risk of SE)
treatment option you would recommend to a pt with the uterus and unable to respond?
clonidine (lots of SE)
side effects/ risk of breast cancer from use of HRT
- increased risk after 1 year of use & prolonged use
- increased risk in combined HRT compared to oestrogen only
- risk continues after 10 years of stopping
side effects/ risk of ovarian cancer from use of HRT
- small risk, however, risk reduces after a few years of stopping
side effects/ risk of endometriosis cancer from use of HRT
- a reduced risk with progestogen
- women w/ uterus = reduced risk with combined HRT compared to oestrogen only
side effects/ risk of coronary heart disease (CHD) from the use of HRT
- if using combined HRT > 10 years after starting menopause
side effects/ risk of stroke from the use of HRT
- slight increase with both oestrogen only and combined HRT
CI/ cautions of combined HRT
- peri-menopausal phase = <12 months since last menstrual
- Risk of cancer
- liver disease
- prolonged immobility
- women with risk factors for VTE
- hypertension above 160 mmHg
- CHD
HRT treatment for women with a uterus
- oestrogen + cyclical progestogen for the last 12-14 days of the cycle
- continuous administration of oestrogen + progestogen
AVOID if in peri-menopausal phase
HRT treatment for women without a uterus
- continuous oestrogen-only use
- if endometriosis occurs - consider addition of progestogen
when to stop & restart HRT during elective surgery
4-6 weeks
restart when fully mobile
when to stop & restart HRT during non-elective surgery
- start anticoagulant prophylaxis (heparins)
and compressive stockings
what contraceptives to use in patients under 50 y/o
combined contraceptive
what contraceptives to use in patients over 50 y/o
barrier methods
when to stop the use of HRT
• Prolonged immobility = increased risk of VTE
• Severe abdominal pain
• VTE/ PE
- Chest pain, SOB, bloody cough
- Swelling/ severe pain of one calf
• Stroke/ neurological
- Unusual severe prolonged headache
- Loss of vision, hearing disturbance
- Dysphasia
- Seizures
- Collapse, motor disturbance, numbness
• Liver dysfunction
- Hepatitis, jaundice…
- Severe stomach pain
• Blood pressure
- Systolic > 160mmHg or diastolic >95mmHg
treatment for menorrhagia
• oral progesterone can be used but tranexamic acid more effective
• mefenamic acid also used for heavy/ irregular periods
treatment for miscarriage prevention
• vaginal micronized progesterone (UL) until 16 weeks gestation
• offered if the following:
- vaginal bleeding in women with confirmed IUD pregnancy
- previous miscarriage
• Aspirin 75mg and low dose prophylactic LMWH can decrease fetal loss risk with antiphospholipid antibody syndrome + recurrent miscarriage
what is hyperthyroidism & what the hormones regulate
- excess production/secretion of thyroid hormones
- regulates; metabolic rate, heart rate, digestive function, muscle control and brain development
primary hyperthyroidism
- thyroid issue: caused by grave’s disease, an autoimmune disease that attacks the thyroid gland = overactive production of thyroid hormone
symptoms of hyperthyroidism
- fatigue
- goitre
- heat intolerance
- palpitation
- hyperactivity
- anxiety
- increased appetite
- weight loss
- diarrhoea
complications of hyperactivity
- pregnancy complication
- atrial fib
- grave’s disease
- heart disease
- thyrotoxic crisis
- reduced bone density