Block 33 Week 6 Flashcards
how does E coli lead to watery diarrhoea?
Escherichia coli(heat-labile enterotoxin) - activates adenylate cyclase (via Gs) leading to increases in cAMP levels -> watery diarrhoea
Vitamin B6 deficiency?
Vitamin B6 deficiency can result in seizures due to reduced production of GABA - the major inhibitory neurotransmitter in the CNS
Vitamine B1 deficient?
(thiamine)muscle weakness and anergia
Vitamin C deficiency?
bleeding gums and prolonged wound healing
vitamin B7 deficiency
(biotin)alopecia and dermatitis
vitamin B3 deficieny?
niacin)pellagra, diarrhoea and dermatitis
vitamin B6 deficiency
- (pyridoxine) seizures (pyridoxine is an important cofactor required for the synthesis of GABA),
- peripheral neuropathy,
- sideroblastic anaemia
attributable risk =
the rate in the exposed group minus the rate in the unexposed group
most common causative agents of cellulitis?
- Staphylococcus aureusandStreptococcus pyogenes
- staph pyoegenes causes 2/3rd of cases
vasodilation is caused by?
PGI2
ciclosporin and tacrolimus mechanism?
inhibit calcineurin thus decreasing IL-2
Where is ACh synthesised?
ACh is synthesised in the basal nucleus of Meynert in the central nervous system.
hyperacute organ rejection =
hours after transplantation - mediated by B cells
acute organ rejection/ chronic?
develops months to years later, cytotoxic T cells
neural tube ->
CNS neurons, astrocytes and oligodendrocytes, POST PITUITARY
surface ectoderm ->
anterior pituitary, epidermis and lens of the eye.
neural crest ->
- autonomic nerves, cranial nerves and the facial and skull bones, Schwann cells
- melanocytes
down and out lesion?
- down and out appearance of eyes
- CNIII lesion
- caused by the unopposed function of the lateral rectus muscle (supplied by cranial nerve VI) and the superior oblique muscle (supplied by cranial nerve IV).
action of LR?
abduct the eye
Superior oblique muscle?
abduct, depress and intort the eye.
which ab inhibit peptidoglycan cross linking?
penicillins,cephalosporins,carbopenems
peptidoglycan synthesis inhibitors?
glycopeptides(e.g. vancomycin)
50S subunit inhibitiors?
macrolides,chloramphenicol,clindamycin,
30s subunit inhibitors?
aminoglycosides,tetracyclines