To sort Flashcards
How does amiodarone affect the QT interval and which condition is it contraindicated in?
Prolongs QT interval and CI in long QT syndrome
What is the most common cause of an extradural haematoma?
Trauma - skull fracture in teporal/parietal region leading to a bleed in the middle meningeal artery
What type of haematoma is known to lead to a traumatic brain injury with a lucid interval?
extradural haematoma
What prophylactic drugs are given to longterm steroid users?
PPI (lansoprazole) for gastroprotection and bisphosphonates and calcium for osteoporosis prevention
How do tendon reflexes change above, at and below the level of spinal cord compression?
normal above
absent at
increased below
Which condition is internuclear ophthalmoplegia associated with and which cranial nerves are affected?
Multiple sclerosis
CN ipsi 3rd and contra 6th leading to diplopia
What is the classic triad of Horner’s syndrome and what causes it?
Ptosis, miosis and anhydrosis
lesion of the sympathetic trunk
What is the histological hallmark of pilocytic astrocytomas?
Rosenthal fibres
What type of drug is sildenafil and what is it used to treat? What is its street name?
phosphodieserase inhibitor
Tx for erectile dysfunction as it inhibits PDE which is used by the sympathetic nervous system to cause smooth muscle contraction that leads to flaccidity
AKA viagra
How can lifting the testis above the symphysis help you differentiate between 2 causes of tesituclar pain?
Pain increases if due to testicular torsion
Pain decreases if due to epididymitis
What is the ddx for a rash that involves the palms and soles?
Measles, syphilis and coxsackie virus
What is the Jarisch-Herxheimer reaction?
Fever, headache, rigors and myalgia in reaction to syhphis treatment that resolves w/in 24 hrs - mgmt: antipyretics and reassurance
What is the ddx for hyponatraemia?
Hypo or hypervolaemia Diuretic use N&V, diarrhoea liver cirrhosis cardiac failure SIADH adrenal insufficiency renal failure burns sweating
Which test would help you investigate Cushing’s disease?
Overnight dexamethasone suppression test
Which test would help you investigate adrenal insufficiency?
Synacthen test
Which test would help you investigate adrenal insufficiency and GH deficiency?
Insulin tolerance test
Which test would help you investigate GH deficiency?
glucagon test
Which condition is thumb squaring a feature of?
Osteoarthritis
How do platelet levels change in rheumatoid arthritis vs lupus?
Rheumatoid –> thrombocytosis
Lupus –> thrombocytopenia
What is the difference between thrombocytosis and thrombocythaemia?
They are both terms for high platelet levels
Thrombocytosis - cause is known
Thrombocythaemia - cause is unknown
What is the classic triad of Wernicke’s encephalopathy?
Ataxia, nystagmus, confusion
How do you treat Wernicke’s encephalopathy?
IV thiamine (B1)
How does Korsakoff syndrome differ from Wernicke’s encephalopathy?
Korsakoff = Wernicke’s + memory impairment (dementia) and is irreversible
What are the extra-articular manifestations of rheumatoid arthritis?
Episcleritis, subcutaneous nodules, peripheral sensory neuropathy and pericardial effusion
(SEEN - subcut nods, epis, effusion, neuropathy)
What is the treatment for paracetamol overdose?
Depending on paracetamol levels (plot of graph)
N-acetyl cysteine
What is the treatment for subarachnoid haemorrhage?
Extra-ventricular device to drain CSF and reduce ICP
What are the four main complications of a subarachnoid haemorrhage?
Hydrocephalus, rebleeding, vasospasm, seizures
What is the ophthalmologic complication of anticholinergic drugs?
Glaucoma causing blurred vision
How does Epstein-Barr virus present and what would you expect to see on a blood film?
Sore throat, myalgia, fever, tiredness, splenomegaly
Blood film = atypical lymphocytes
What would you expect to see on a lumbar puncture in someone with MS?
Oligoclonal bands
What effect does MS have on visually evoked potentials?
reduced
What is the initial tx/tx for acute flare-ups of MS?
Methyprednisolone
What is the longterm disease modifying treatment for MS?
Natalizumab or beta-interferon
What does neutrophilia indicate?
Bacterial infection, corticosteroid use
What does neutrophilia in the context of MSK indicate?
Septic arthritis
What does neutropenia and thrombocytopenia in the context of MSK indicate?
drug-induced bone marrow suppression
What does lymphopenia indicate?
SLE
What does eosinophilia in the context of MSK indicate?
eosinophilic granulomatosus with polyangiitis
What can a red, shiny, swollen joint be a sign of?
Septic arthritis or gout
What type of drug is Allopurinol and what is it used to treat?
xanthine oxidase inhibitor
tx for gout
xanthine oxidase is responsible for purine metabolism which increases the production of uric acid which can form crystals and result in gout
How does acute gout affect serum uric acid levels?
Can reduce it
What crystals are found in gout?
Monosodium urate - long, needle-shaped, negatively birefringent
What crystals are found in pseudogout?
calcium pyrophosphate - small, brick-shaped, weak positive birefringent