AST stuff forgetting Flashcards
What hormones are imbalanced in:
Cushings
Conn’s
Addison’s
● Cushings - excess cortisol
● Conn’s - excess aldosterone
● Addison’s - aldosterone and cortisol deficiency
G cells produce what? Where found?
G-cells; Gastrin, antrum
Parietal cells produce what? Where found?
Parietal cells - HCL and intrinsic, fundus + body (stimulated by ACh + histamine)
what do chief cells produce?
Chief cells - pepsinogen
Smoking cessation
○ ready
○ steady
○ stop
○ pre-contemplation - not thinking about stopping
○ contemplation - thinking about it but not ready
○ preparation - setting a date, throwing away ashtrays
○ action - not smoked 6months
○ relapse - had a cig which led back into regular smoking
What is bradykinin
● bradykinin is a vasodilator and mediator of pain - broken down by ACE
Features of obstructive lung disease
○ raised TLC, IRV, ERV, FVC
○ reduced FEV1
○ COPD, emphysema, asthma
Features of restrictive lung disease
○ reduced everything
○ pulmonary fibrosis + asbestosis
Role of lymphatics
transport antigens to immune system, drain extracellular fluid, transport antibodies
Vital capacity
Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation.
3 layers of oesophagus
Mucosa, submucosa, muscularis externa.
BMI calculation
MASS (KG) / HEIGHT (M2) = BMI (KG/M2)
5 food groups
○ milk and dairy ○ fruit and veg ○ meat and fish ○ starchy foods ○ fat + sugar
stress
a state of mental, physical or emotional strain where the demands made upon an individual are greater than their capacity to cope
○ eustress - positive, motivational
○ distress - detrimental, negative stress
internal pharyngeal constrictor
upper oesophageal sphincter muscle
epileptic seizure
abnormal excessive or synchronous neuronal activity in the brain
What can low dose aspirin, ACE inhibitors and diuretics do?
cause a buildup of sodium urate and cause gout
anion gap
the difference in amount of positive and negatively charged ions in serum
allopurinol
a gout medication that inhibits xanthine oxidase which causes uric acid buildup. Allopurinol is metabolised by aldehyde oxidase
pathological fracture definition
a soft tissue injury characterised by the break in the continuity of bone which has been weakened by a disease process
testicular cancer
○ cryptorchidism, HIV, smoking - risk factors
○ germ, sertoli, leydig - 3 types
○ seminomas and non-seminomas
○ HCG, AFP, LDH - tumour markers
how do NSAIDs work
block COX enzymes so no prostaglandins produced. prostaglandins mediate pain, inflammation and clotting
d-cells produce
somatostatin
behavioural signs of smoking
(don’t confuse with emotion or mental)
○ increase in alcohol/smoking
○ weight gain/loss
○ sleep disturbances
aldosterone synthase
the enzyme responsible for making aldosterone in the glomerulosa of the adrenal cortex
vision: rods and cones
○ rods - black and white, scattered peripherally, more sensitive (due to convergence), give vision in low light,
○ cones - colour, definition, all over retina, work in bright light, no convergence
○ use rhodopsin as a pigment mainly
normal CD4 count
400-1500 PER MILLIMETRE CUBED
AIDS CD4 count
AIDs defining features
■ pulmonary - TB, pneumocystis, pulmonary candida
■ neuro - cerebral toxoplasmosis, primary cerebral lymphoma
■ cancers - burkitts lymphoma, karposi sarcoma, NHL, cervical Ca,
HIV/AIDs risk factors
MSM, IVDU, sex in high risk countries, unprotected sex
AIDS cancer viruses
epstein barr, HSV and HPV
osteoporosis common in which bones
neck of femur, vertebrae, distal radius
pagets common features
skull, hip, vertebrae, CN compression (deafness). deep dull ache worse at night
avascular necrosis
scaphoid, head of femur, talus
tropicamide
drug that inhibits the parasympathetic system. pupil dilation
anencephaly
spina bifida but in the skull
normal GFR
90mls/min/1.73m2
what need to do before renal transplant? Absolute CIs?
○ blood type, tissue cross match and HLA
○ DM and recent malignancy are absolute contraindications
why can pain from the diaphragm can be felt in the shoulder?
pain from the diaphragm can be felt in the shoulder because the phrenic nerve does all that stuff
difference between anaesthetics and analgesics
analgesics stop pain, anaesthetics stop feeling/sensation
osteomalacia
is failure of bone mineralisation due to lack of vit D
calcium intake
700mg daily
what are fibroids
benign leiomyoma - increase surface area
how do NSAIDs inc production of HCl
prostaglandins inhibit parietal cells from producing HCL. NSAIDS stop prostaglandins so increase the production of HCL, causing ulcers
what do curves in the pinna of the ear do?
curves in pinna help determine the direction of sounds and emphasise the sounds close to human speech
what structures make up the middle ear? function?
MIS
malleus, incus, stapes - amplify
purpose of the cochlea
cochlea determines high sounds from low sounds
higher sounds as base of cochlea, lower sounds at the apex
what do louder sounds do?
louder sounds vibrate more hairs on the organ of corti which fires action potentials
tympanic membrane:
loud / quiet sounds?
higher sounds?
■ louder/quieter sounds - vibrate the membrane more/less dramatically/harder or softer
■ higher sounds produce a quicker vibration
■ A high, loud sound produces a quick, big vibration
which muscles control hearing?
tensor tympani and stapedius muscles
smoking cessation treatments
bupropion and NRT
secondary prevention
slowing down/preventing spread/screening
tertiary prevention
stopping effect once disease is established
recommended alcohol intake for men and women
○ men - 3-4 units
○ women 2-3
how much in a unit of alcohol
○ 8g/10mls
fetal alcohol syndrome
close set eyes
cns abnormalities - mental retardation
prehepatic jaundice
○ increased haemolysis - more unconjugated bilirubin in blood
○ liver can only conjugate a bit at a time
○ raised unconjugated bilirubin in blood but normal amounts in urine and feces is it isn’t water soluable - normal colours
hepatic jaundice
○ normal amounts of unconjugated bilirubin reach liver
○ liver conjugates as normal
○ a blockage in the liver stops conjugated bilirubin reaching the gut as bile pigments and so it’s absorbed into blood
○ filtered by kidneys and the pigment comes out in wee. Normal stools, dark urine.
post-hepatic jaundice
○ blockage after bile duct
○ liver conjugates everything as normal but a later blockage causes all pigment to be released into blood
○ same again pale/normal stools, dark urine PURITUS
MS
numbness, reduced red visions, reduced visual evoked potentials, blind spot, problems hopping on one leg. YOUNG
guillian barre can be brought on by
flu-like illness
spermatogenesis can be interfered with by
wearing tight jeans
sensitivity
number of true positives (true positives/true positives + false negatives)
specificity
number of true negatives (true negatives/true negatives + false positives)
what is raised in giant cell arteritis
ESR
stages of labour
○ latent
○ active
○ fetal expulsion
○ delivery of placenta
normal blood glucose
3.5-5.5mmol/L after overnight fast
diabetes blood glucose
6-7mmol/L fasting blood glucose on two occasions
what is alports
an X-linked kidney disease characterised by a triad of nephritis, deafness and ocular lesions
WAIT why does hypokalemia cause alkalosis?
○ okay so you have a low potassium in the blood
○ to try and raise blood potassium, cells begin to give up the potassium within their cytoplasm
○ however as potassium is a positively charged ion, this leaves the inside of the cells with a big negative charge as all the K+ has left
○ to make up for this, H+ from the blood moves into the cells to bring the charges back to normal
○ because loads of H+ has now been removed from the blood, blood pH will rise, causing an alkalosis
proteus mirabilis
is responsible for bladder stones
kidney stones are made up from
calcium (oxalate?)
gout crystals are
sodium urate (negatively bifringent needles)
pseudogout is
calcium pyrophosphate
hypersensitivity 1
allergy - asthma - IgE - fast, basophils, histamine
hypersensitivity 2
cytotoxicity - graves, goodpastures, IgM/G - complement, MAC, antibody binds to pathogen and kills it
hypersensitivity 3
immune complex - SLE - IgG - antibody binds to foreign antigens in the blood and stick together, starting the basis of immunity
hypersensitivity 4
delayed - TB, chronic transplant rejection - T-cells find antigen and activate macrophages
what immunoglobulin can cross placenta
IgG
IgM is
primary response
IgG is
secondary response
TH lymphocytes express what type of marker?
CD4
what type of sensitivity are contact allergies (mantoux test)>
type 4 sensitivity
knee ligaments: ant and post cruciate ligaments
aid backwards and forwards motion of the knee, provide stability when bending
knee ligaments: lat and med collateral ligaments
provide sideways stability
knee ligaments: anterior cruciate injury
knee bends wrong way, car crash, hyperextension
knee ligaments: Medial collateral injury
impact from the side, sideways tackle
knee ligaments: meniscal tear
from twisting motions
chrons
any part of the tract
genetic
patchy
flare ups
UC
colon
telomerase
is the enzyme which lengthens telomeres
thrombosis
- a blood clot within a vessel
embolism
- vascular occlusion caused by foreign body
virchow’s triad
- abnormal blood flow, vessel injury, hypercoagulation
neoplasm
a new abnormal tissue growth which is autonomous and continues to grow after the stimulus has been removed
BP =
vasc resistance x CO
CO =
SV x HR
fatty streaks are characteristic of
ATHEROscleriosis
whereas hardening = arteriosclerosis
list 4 duties of a dr
○ care for patient first concern
○ provide good standard of practice and care
○ never discriminate unfairly against patients or colleagues
○ be honest, open and act with integrity lol
normal sperm conc
> 15million/ml
where are baroreceptors
in carotid sinus and aortic arch
where are stretch receptors
right atrium
3 components of virchows triad
change in vessel wall (endothelial damage)
change in blood constituents (hypercoaguability)
change in flow (stasis)
calculate blood pressure from stroke volume, heart rate and systemic vascular resistance
BP = SV x HR x SVR
classic triad meningitis
neck stiffness
photophobia
fever
xray features osteoarthritis
joint space narrowing
hardening of bone (osteophyte formation)
subchondral sclerosis
subchondral cysts
definition of a fracture
soft tissue injury caused by a break in the continuity of bone
what causes the sound of a murmur
turbulent blood flow
what causes an ejection systolic murmur that radiates to the carotids
aortic stenosis
a mid-systolic ejection murmur, heard best over the “aortic area” or right second intercostal space, with radiation into the right neck (carotids)
RAAS - describe
renal blood flow reduced
juxtaglomerular cells release renin
plasma renin converts angiotensinogen to Angiotensin I in liver
angiotensin I converted to II by ACE in lungs
Angiotensin II = potent vasoconstrictor = inc BP
Angiotensin II stimulates release of aldosterone from renal cortex (glomerulosa)
Aldosterone causes the tubules of the kidneys to increase the reabsorption of sodium and water into the blood, while at the same time causing the excretion of potassium (to maintain electrochemical balance).
This increases the volume of extracellular fluid in the body, which also increases blood pressure.
gold standard test diagnosis for coeliacs
duodenal biopsy
what do u see histologically coeliacs
villous atrophy and crypt hyperplasia
Antibodies in coeliacs
anti tissue transglutaminase (a-TTG) and anti endomysial
cancer most associated with asbestos exposure
mesothelioma
What are the 2 cardiac arrhythmias which are responsive to emergency external cardioversion?
VF, pulseless VT
Give 2 locations in which baroreceptors are found?
Aortic arch, carotid sinus
In a 38 year old woman who had recent dental surgery, what is the most common organism responsible for infective endocarditis
strep viridans
What are the four features of tetralogy of fallot?
Overriding aorta, pulmonary stenosis, VSD, right ventricular hypertrophy
What are the ECG changes in Hyperkalaemia
Tall tented t-waves, wide QRS, absent (hidden) p waves
define shock
Circulatory failure resulting in inadequate tissue perfusion resulting in cellular injury - life-threatening
What is the screening test for AAA
Abdo USS
What is de’musset’s sign?
Bobbing of the head with aortic regurg
What score is used to calculate risk of stroke after diagnosis of AF
chads2vasc
chads2vasc
C Congestive heart failure (or Left ventricular systolic dysfunction) (1)
H Hypertension: blood pressure consistently above 140/90 mmHg (or treated hypertension on medication) (1)
A2 Age ≥75 years (2)
D Diabetes Mellitus (1)
S2 Prior Stroke or TIA or thromboembolism (2)
V Vascular disease (e.g. peripheral artery disease, myocardial infarction, aortic plaque) (1)
A Age 65–74 years (1)
Sc Sex category (i.e. female sex) (1)
Give 3 bacterial causes of community acquired pneumonia
Any of: strep. Pneumoniae, h.influenzae, klebsiella, staph aureus, mycoplasma, e.coli, pseudomonas aeruginosa, legionella, chlamydophilia pneumoniae, coxiella burnetii.
How do the Penicillin group of antibiotics work?
They inhibit formation of peptidoglycan cross links in the bacterial cell wall.
What is the antibiotic treatment of community acquired pneumonia in a high risk patient?
IV amoxicillin and clarithromycin (to cover atypicals)
What does each of the components of CURB 65 stand for?
Confusion Urea (over 7) Resp rate (above 30) BP (below 90/60) Age over 65. Over 3 indicates a high risk.
What is vital capacity?
Total lung capacity - residual volume.
So this is the amount of air that can be breathed out from total lung volume. It is usually between 3-5L.
What is the diagnostic test to confirm Cystic Fibrosis?
Sweat test. This is the diagnostic test. Immunoreactive trypsinogen is the screening test to identify newborns for the sweat test.
Sandra is having an asthma attack. She is too breathless to speak in full sentences, her RR is 40 and her HR is 130. Her peak flow is 40% of predicted value. How would you manage her?
O2 via facemask
nebulised salbutamol
oral prednisolone/ IV hydrocortisone
Repeat salbutamol every 20-30 mins as needed.
What is the treatment of TB (give the names of the drugs and the durations)
RIPE (avocado hehe)
Rifampicin, isoniazid (6 months), pyrazinamide, ethambutol (2 months)
A patient who has had a previous heart attack is given aspirin to prevent any further events occurring. Is this primary, secondary or tertiary prevention?
Secondary