High yield Flashcards
What role does dopamine have on AKI
NONE
- 3 systematic reviews - concluded no benefit in treating or preventing AKI
- potential harm - incl MI, arrhythmias and reduced intestinal blood flow
e. g Fenoldopam - BAD
Treatment of severe malaria
- mortality 15-25% - jaundice, severe anaemia, ARDS
- IV artesunate - treatment of choice for severe malaria!!!
- resistance has emerged in SE asia - single point propeller region mutation - chromosome 13
- Severe malaria
- IV artesunate 2.4mg/kg bolus IV then daily (S/e cerebellar ataxia)
- switch to oral artemether-lumefantrine to complete 3 days
- if not available, then do IV quinine instead of atesunate
Prophylaxis of malaria
Mefloquine - effective against both vivax and falciparum - resistance in thailand, cambodia - start 2 wks before travel, 4 weeks after reutrn, SE - GI , cardiac, neuro - psychotic episodes, safe in 2nd and 3rd trimester of pregnancy
Doxycycline - 1 day before and 4 weeks on return - contraindicated in pregnancy - SE - photosensistivity, GIT upset, OCP ineffective
Malarone - expensive, start one 1 day before, continue one week after
insufficient data on pregnancy
what is medullary sponge kidney and cystic kidney
Medullary sponge kidney - common, malformation of terminal collectiing ductos - microscopic and macro medullary cysts - generally bilateral
- benign, but associated with nephrolithiasis and UTIs
- majority causes sporadic then inherited
Medullary cystic kidney - misnomer - majority do not have renal cysts evident on imaging - predom a tubulo-interstitial disorder - progress to ESRD
define acute infective endocarditis and likely organisms
Short history (days) of fevers, rigors, unwell,
hypotension, embolic lesions, heart failure
– Aggressive organism eg Staphylococcus aureus
what is NGAL? - Neutrophil Gelatinase Associated liocalin?
- originally found bound to gelatinase from human neutrophils
- expression upregulated following ischaemia in renal prox epithelial cells
- INCREASE in NGAL in blood probably from other organs
- INCREASE in NGAL in urine from renal tubular cells - predicts development of AKI early and sustained AKI.
Define PUO
- Prolonged illness (2-3 weeks duration)
- Fever (above 38.3C) on several occasions
- No diagnosis after intelligent investigations
What is dengue fever?
- spread
- incubation?
- serotypes?
- flaviviruses - spread by mosquitoes
- 4 serotyes - 1 to 4, incubation 3-10 days
- four clinical syndromes - undifferentiated fever, classic fever, dengue hemorrhagic fever, dengue shock syndrome (DSS severe form)
what is autosomal dominant polycystic kidney disease
- inherited disease
irreversible decline in kidney fn, most common cause of genetic cause of CKD - 5% sporadic, 75% fmhx
accnts for 5% of pts with ESRD on dialysis
PKD1 - chromosome 16 - polycystin 1 - more RAPID deterioration, more cysts and ESRD at age 54
PKD2 - chromosome 4 - protein polycystin 2 - more indolent decline renal fn, median age ESRD 74
What is the duke criteria
Duke Criteria (Durack) 1994
– Pathological criteria
– Clinical criteria
2 major - microbiology - typical bugs in two bottles, persistantly positive BC with unusual organism, endocardial involvement - echo criteria and new murmur or positive serology for C.burnetti
1 major and three minor
- 5 minor, fever over 38, vascular phenomena, immunological (osler, roth, glomnephritis), heart cond or IVDU, suggestiev microbio
Nephrotoxic agents that can contribute to AKI
- radiocontrast
- aminogylcosides
- cisplatin
- ACEI, ARBs
- NSAIDs
- Tacrolimus, cyclosporin
What antibiotics to use when resistance - carbapenems, aminoglycosides, colistinm tigecycline, fosomycin?
- Carbapenems - use only if low level Resistance - double therapy
- aminoglycosides - use only if not Resistance (amikacin> gent)
- colistin - nephrotoxicity - complicated dosing
- tigecycline - inappropriate for bacteraemia - large Vd, increased mortality - does not cover pseudomonas
- fosomycin - strongest data only for UTI/prostate
Haematuric renal disorders - general classification
- proliferation of resident glomerular cells
- mesangial
- epithelial
- endothelial
- influx of systemic inflamm cells
minimal change disease ?
- not associated with progressive renal insufficiency
- based upon histopath
- renal biopsy normal on light micro
- electron micro - reveals effacement flattening of podocyte foot processes
- disruption of integrity of protein barrier - resulting in heavy proteinuria
- 90% of cases of nephrotic syn in child less than 10, 10-15% of adult cases of nephrotic syn
- other causes - malignancy (haem) or drugs (NSAIDs and cox2, bisphosphonates)
Tx for PCKD
- vasopressin receptor antagonist - Tolvaptan
other novel tx
- mTOR - rapamycin - no difference
Mx - HTN, haematuria, UTIs, calculi
extra renal - liver disease, vascular (aneurysms, valvular heart disease
Rhabo summary
- leakage of muscle cell contents into circulation
- myoglobin - filtered by glomerulus, enters tubular epi cells - causes toxicity through vasocons (intra renal , direct tub toxicity thru oxidative damage and tubular obstruction in distal tubules
- precipitation of myoglobin within tubules when interacts with TAMM- HORSFALL protein, favoured by acidic urine
- risk of AKI low when CK less than 15-20k
- hypocal can occur due to calcium entering damaged muscle, rise in potassium
Tx - FLUIDS, some evidence for iv sodium bicarb, minimal evi for mannitol
Most common causes of AKI
- SEPSIS
major surgery, cardiogenic shock, hypovolemia, medications
hepatorenal syndrome, trauma, cardiopul bypass, rhabdo, obstructive uropathy
acquisition of which gene makes staph aureus methicillin resistant
SCC MEC - staph casette chromosome mec
most common is MEC A
what is cystic renal disease?
- acquired cystic disease of kidney
multiple bilateral renal cysts
different from ADPCKD - no fam hx, small to normal sized kidneys and smooth contour
associated with renal cell cancer - no screening in AUS
What is chikungunya
- alphavirus
- spread by aegypti and albopictus mosquitos
- same mosquitos that spread dengue fever
- India, malaysia, carribbean
- incubation 2-4 days - range 1-14 days
- Sx FEVERS, arthralgias, rash and myalgia
- Dx - serology and alphavirus PCR
- 72-97% get symptomatic disease - arthritis can be debilitating - bent posture
Define sub acute endocarditis
– Long history (weeks to months) “PUO”
– Malaise, fever, night sweats, weight loss
– Immunological and embolic phenomena
Tx for uncomplicated malaria
- First line - ARTEMETHER-LUMEFANTRINE (riamet)
- 4 tabs BD for 3 days, take with fatty food, >95% cure in p.falciparum, p.vivax good efficacy
- second-line - atovaquone-proguanil (Malarone)
- 4 tabs daily for 3 days, slower parasite clearance than riamet
- treatment failure reported
- can also be used for prophylaxis
- Third line
- quinine + doxy/clinda for 7 days
- mefloquine to be dropped
- quinine + doxy/clinda for 7 days
What are the common complications of endocarditis?
- CCF from valvular dysfunction
- Embolisation - risk drops after first week of abx therapy - increase if >1cm ant MV vege or S. aureus
- Periannular extension of infection - needs valve replacement, may cause AV block (node)
- Splenic abscess
- Mycotic aneurysms - can occur early or late
What is P.falciparum
- plasmodia that infects humans
- almost all death/severe disease
- no dormant liver stage, no late relapses
- medical emergency - almost always chloroquine resistant