mrcp part 1 Flashcards
quinolones mechanism of action
inhibit topoisomerase II (DNA gyrase) and topoisomerase IV
most common cause of viral meningitis
human enteroviruses- coxsackievirus/ echovirus
specificity
people who DO NOT have the disease and test NEGATIVE
TN/ (TN + FP)
sensitivity
people who HAVE the disease and test POSITIVE
TP/ (TP + FN)
mechanism of action of cisplatin
can cause cross linking in DNA
( CC- Ciplatin= Crosslinking)
Mechanism of action of vincristine
inhibits microtubules formation
positive predictive value
the chance the person has the disease if the test is positive
PPV= TP/ (TP +FP)
negative predictive value
the chance the person DOES NOT have the disease if the test is NEGATIVE
NPV= TN/ (TN + FN)
Burkitts lymphoma gene
c-myc gene translocation
normallt t(8;14)
receptor for EBV
CD21
(21 year olds can get EBV)
treatment for widened QRS in tricyclic overdose
IV sodium bicarb
Loffler’s syndrome
Transient respiratory illness (fever, cough, night sweats) causing blood eosinophilia and CXR shadowing.
Can be caused by parasites
Treatment for acute eosinophilic pneumonia
highly responsive to steroids
secondary messenger system stimulated by NO
cGMP
Action of proteasome
Degredation of polypeptides through breaking polypeptide bonds
Found in nucleus and cytoplasm
Von Hippel-Lindau method of inheritence and location of gene
Autosomal dominant
VHL gene on chromosome 3 (VHL=3letters= chromosome 3)
Von Hippel-Lindau associated tumours
cerebellar haemangiomas–> subarachnoid haemorrhages
retinal haemangiomas–> vitreous haemorrhage
renal cysts (premalignant)
phaeochromocytoma
extra-renal cysts: epididymal, pancreatic, hepatic
endolymphatic sac tumours
clear-cell renal cell carcinoma
Cancer associated with Hashimotos
MALT tumours
can present without typical B featuresf
CLL treatment regime
FCR
Fludarabine cyclophosphamide rituximab
Non Hodgkins lymphoma treatment
RCHOP
Rituximab doxorubicin cyclophosphamide vincristine
Gene defect in AIP Acute intermittent Porphyria
Porphobilinogen deaminase
Aip- porphobilinogen deAminase
Gene defect in PCT porphyria cutanea tarda
uroporphinogen decarboxylase
pCt= uroporphinogen deCarboxylase
investigation for betathalasaemia trait
haemoglobin electrophoresis
causes of upper zone fibrosis
C - Coal worker’s pneumoconiosis
H - Histiocytosis/ hypersensitivity pneumonitis
A - Ankylosing spondylitis
R - Radiation
T - Tuberculosis
S - Silicosis/sarcoidosis
Think up in the charts
cause of soft S2
aortic stenosis
LBBB heart sound
reversed (left) split S2
RBBB heart sound
widely split (right) S2
cause of loud S2
hypertension
widely split S2 causes
RBBB
pulmonary stenosis
severe mitral regurg
deep inspiration
reverse split S2 causes
LBBB
patent ductus arteriosus
R ventricular pacing
severe AS
WPW syndrome type B
syphillis serology
Positive non-treponemal test and positive treponemal test
active syphillis infection
syphillis serology
Positive non-treponemal test + negative treponemal test
false positive
(e.g. SLE, RA, malaria, HIV, antiphospholipid syndrome, TB, leprosy)
syphillis serology
Negative non-treponemal test + positive treponemal test
previously treated syphillis
Fabry’s disease
X linked disorder
deficiency in alpha galactosidase–> causes progressive lysosomal depositiion of Gb3 in various tissues causing multiorgan dysfunction
Budd Chiari symtoms
ascites, abdominal pain, and hepatomegaly
(thrombosis of the hepatic vein)
when to suspect a diagnosis of MODY
individuals with persistent, asymptomatic hyperglycemia detected before the age of 25, without the typical features of Type 1 or Type 2 diabetes
MODY 2 treatment
no specific treatment required
MODY 3 treatment
low dose sulphonylurea
cyclosporin side effects
nephrotoxicity and hepatotoxicity
fluid retention
hypertension
hyperkalaemia
hypertrichosis
gingival hyperplasia
tremor
impaired glucose tolerance and hyperlipidaemia
increased susceptibility to severe infection
(everything is increased)
symptoms of Pendred’s disease
autosomal recessive disorder found on chromosome 7 causing a defect in the organification of iodine
bilateral sensorineural deafness
mild hypothyroid
goitre
causes of normal ion gap acidosis
ABCD
Addisons
Bicarb loss (diarrhoea or renal tubular acidosis)
Chloride excess
Diuretics
causes of high ion gap acidosis
lactate- sepsis
Ketones- DKA
renal failure
toxins
main constituent of pulmonary surfactant
phospholipids, proteins and carbohydrates- dipalmitoyl phosphatidylcholine
=DPPC
treatment of magnesium sulphate induced respiratory depression
calcium gluconate
What are Forrest plots/ blobbograms used for?
Blobbograms are used to display the results of all the constituent studies included in a meta-analysis.
Conventionally, each study is represented with a data point showing the odds ratio (e.g. of death in placebo vs control) with error bars representing a 95% confidence interval.
What are funnel plots used to show?
Publication bias in meta-analyses
What are box plots used for
Used to show quantitative results
Can show the means and range etc as well as positive or negative skew
What does a histogram show
Type of bar chart that shows how many times a variable occurs within a set range.
e.g. the number of myocardial infarctions on the y-axis against patient age by decade on the x-axis
what does a symmetrical inverted funnel plot indicate?
publication bias is unlikely
Which class of antibodies mediate hyperacute organ rejection
IgG
pre-exsiting IgG antibodies against HLA antigens
3 reasons for hypertension in patients with neurofibromatosis
essential hypertension
phaeochromocytoma
renal vascular stenosis from fibromusculardysplasia
causative organism for bilateral pneumonia with cavitating lung lesions following a viral illness?
staph aureus
which type of bacteria is listeria
gram positive bacillus
therapy indicated for heart failure patients with a LVEF < 35% who are still symptomatic on ACE-inhibitors & beta-blockers
sacubitril-valsartan
therapy for adrenaline induced ischaemia
phentolamine
drugs which may cause an acute attack of AIP
barbiturates
halothane
benzodiazepines
alcohol
oral contraceptive pill
sulphonamides
diagnostic criteria for patients with suspected COPD
FEV1/FVC less than 70% predicted and symptoms suggestive of COPD
treatment for facial hirsutism
topical eflornithine
Treatment for GuillianBarre Syndrome
IV IG
(helps neutralise the antibodies which cause GBS)
severe hypokalaemia ECG changes
U waves
small or absent T waves (occasionally inversion)
prolong PR interval
ST depression
long QT
(U have no Pot and no T but a long PR and a long QT)
Holmes Adie pupil
once the pupil has constricted it remains small for an abnormally long time
slowly reactive to accommodation but very poorly (if at all) to light
McArdles disease symptoms
muscle pain and stiffness following exercise
muscle cramps
myoglobinuria
low lactate levels during exercise
test used to investigate hypopituitarism
insulin stress test
Give IV insulin and measure GH and cortisol
spinal cord compression above level of L1 symptoms
upper motor neuron signs and a sensory level
spinal cord compression below the level of L1 symptoms
lower motor nueron signs
increased tendon reflexes above the lesion
absent tendon reflexes at the lesion
diagnostic criteria for allergic bronchopulmonary aspergillosis
Major criteria for the diagnosis are:
Clinical features of asthma
Proximal bronchiectasis
Blood eosinophilia
Immediate skin reactivity to Aspergillus antigen
Increased serum IgE (>1000 IU/ml)
Minor criteria:
Fungal elements in sputum
Brown flecks in sputum
Delayed skin reactivity to fungal antigens
management for allergic bronchopulmonary aspergillosis
glucocorticoids
itraconazole is second line
indicators for severe pancreatitis
hypocalcaemia
hyperglycaemia
age over 55
hypoxia
elevated LDH and AST
neutrophilia
treatment of thyroid dysfunction for a patient recently started on amiodarone
continue amiodarone and give thyroid replacement
first line treatment for myoclonic seizures in males
sodium valporate
drugs which may exacerbate myasthenia gravis
penicillamine
quinidine, procainamide
beta-blockers
lithium
phenytoin
antibiotics: gentamicin, macrolides, quinolones, tetracyclines
Miller Fisher syndrome antibodies
Anti-GQ1b
Myasthenia gravis antibodies
Anti-MuSK
Anti-AChR
Eaton Labert Syndrome antibodies
Anti-VGCC
VIP action
stimulates secretion from pancreas and intestines
inhibits gastric acid secretion
Gene mutation associated with CADSIL
NOTCH3 mutation
(CADSIL= cerebral autosomal dominant arteriopathy with subcortical infarcts and leukencephalopathy)
Fabry disease gene mutation
GLA mutation
Examples of anthracyclines
doxorubicin and epirubicin
most common histological finding in rheumatic heart disease
Ashcoff bodies
(granulomatous bodies found in rheumatic heart fever)
antiphospholipid syndrome clotting screen findings
prolonged APTT
low platelets
Leishmaniasis treatment
miltefosine
mechanism of renal protective use of ACEi
dilation of EFFERENT arteriole
Cancer associated with schistosomiasis infection
Squamous cell bladder cancer
Schisto= Squamous
Histological finding associated with gastric adenocarcinoma
Signet cells
(large mucin containing vacuole pushes the nucelus to one side, giving the appearance of a Signet ring)
plan for patients admitted with MI on metformin treatment
stop metformin as can cause lactic acidois
around 1 in 10 people diagnosed with renal angiomyolipomas are diagnosed with which condition?
tuberous sclerosis
action of maltase
breaks down maltose into 2 glucose
action of sucrase
breaks down sucrose into glucose and fructose
action of lactase
breaks down lactose into glucose and galactose
which type of vaccine is yellow fever
live attenuated
gentamicin is nephrotoxic as it causes what?
acute tubular necrosis
mercury poisoning symptoms
visual field defects, paraesthesias and hearing loss
can also cause hyperchloraemic metabolic acidosis
features of cholesterol emboli
renal failure
livedo reticularis
eosinophilila
purpura
which layer are melanocytes found in?
stratum germinativum
biochemical features associated with anorexia nervosa
HIGH Cs AND Gs
high cholesterol
high cortisol
carotinaemia
high glucose
high GH
high salivary Gland output
Dengue symptoms
fever
retro orbital headache
facial flushing
rash
bitten by mosquitos/returning traveller
fever
retro orbital headache
rash
thrombocytopenia
facial flushing
dengue
Dengue treatment
’
Ipportive with fluids etc
(no anti retrovirals indicated)
Dengue investigations
Bloods- thrombocytopenia, leukopenia, raised liver enzymes
NAATS for viral RNA
NS1 antigen
testicular seminoma tumour marker
HCG
pemphigus vulgaris- antibody is directed against what?
desmoglein
(components of desmosomes)
normal distribution
mean=mode=median
68% of values under the curve lie within 1 standard deviation of the mean
systemic mastocytosis symptoms
urticaria pigmentosa (wheals on rubbing)
flushing
abdo pain
mastocytosis on blood film
best imaging modality for osteomyelitis
MRI
most common bacterial cause of osteomyelitis in patients with sickle cell disease
salmonella
Mantle cell lymphoma gene translocation
t(11:15)
Burkitt’s lymphoma histology
‘starry sky’
lymphocytes sheets with interspersed macrophages containing dead apoptotic tumour cells
presents with
flu like illness less than 1 week–> brief period of remission –> jaundice and haematemesis
Yellow fever
NICE target after starting statin for 3 months
40% reduction in non-HDL 40% cholesterol in 3 months
oseltamivir/ tamiflu mechanism of action
neuraminidase inhibitor
mechanism of hypercalcaemia in sarcoidosis
Macrophages in the granulomas cause increased conversion of Vit D to it’s active form
most important blood test for restless legs syndrome
ferritin
mechanism of action of NAC
replenishes glutathione