Dialysis/transplant/renal function Flashcards

1
Q

types of donor 2

A

living
cadaveric

living include
related
directed
altruistic

cadaveric
DCD
DBD

DCD can further be categorised via Maastricht classification which describes mode cardiac arrest

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2
Q

extended criteria donors

A
DBD donars
more than 60
and 50-59 with 2 of 
hypertension
terminal creatinine >133
cerebrovascular cause of death

extended criteria to increase pool for recipients

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3
Q

contraindications to being a living renal donor 7 absolute

A
absolute
pregnancy
single kidneys
sig below age related gfr cut off
active untreated malignancy
morbid obesity >40
uncontrolled disease process that will impact renal fuction
under 18
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4
Q

how are organs preserved

A

cooling by perfusion cold perfusate
ice

perservation fluid
aim reduce risk cellular degradation due to low oxygen situation

soltran

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5
Q

soltran solution 4 MMCC

A

pot citrate
mannitol
mag sulphate
sod citrate

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6
Q

other perfusates

A

UW Belzer
collins
marshalls

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7
Q

why use right iliac fossa

A
vessels more superficial than left
rutherford morrison incision
ep approach
do vein first
may use internal iliac or common
RA end to side to EIA or end to end to IIA
RV end to side to EIV, CIV
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8
Q

ureterocystostomy

A

can be onlay or tunnelled

donor ureter kept as short as possible with periureteric fat preserved

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9
Q

what is GFR

A

describes flow rate of fluid through the nephrons and is one of the ways to measure kidney function

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10
Q

how can gfr be measured

A

using clearance of a substance from plasma or estimate from plasma creatinine using formula

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11
Q

creatinine overestimation gfr

A

as 10% secreted by kidney

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12
Q

formula to calculate gfr

A

cockcroft gault and MDRD

Cockcroft-Gault CrCl, mL/min = (140 – age) × (weight, kg) × (0.85 if female) / (72 × Cr)

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13
Q

formal measurement GFR

A

Cr 51 EDTA most accurate
DPTA can be used but slightly secreted
single infection Cr51 EDTA given
then measure blood levels at specified intervals 2-5 hours after injection to demonstrate decay curve
slope intercept method to calculate clearance
GFR normalised to BSA

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14
Q

MDRD vs cockcroft gault

A

CG estimates creatinine clearance, used for drug dosing

MDRD for those with impaired function, calulates GFR per BSA, not creatinine clearance

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15
Q

classification CKD

A
based on GFR into five main groups
>90 = 1
60-90 = 2
45-60 = 3a
30-45 =3b
15-30 =4
less than 15 = 5
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16
Q

options for patient with ESRD 3

A

peritoneal dialysis /haemodialysis
transplant
no RRT

leading to certain death average 10-90 days

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17
Q

dialysis options

A

Continuous renal replacement thearpy
haemodialysis
peritoneal dialysis

18
Q

options continuous RRT

A
CVVH
CVVHD
CVVHDF
SCUF - slow continuous ultrafiltration
CAVHD
19
Q

haemodialysis options

A

in centre HD 3 x a week

home HD short daily nocturnal

20
Q

peritoneal dialysis options

A

manual CAPD

cycler APD

21
Q

peritoneal dialysis options

A

manual CAPD

cycler APD

22
Q

indications acute dialysis 5

A
fluid overload unresponsive diuretics
severe hyperkalaemia more than 6.5
severe met acidosis less than 7.1
uraemic symptoms >30 mmol/l
drug overdose dialysable toxin
23
Q

what is difference between HD and CVVH

A

Haemodilaysis is diffusive process using a semi-permeable membrane and a counter current flow (contraflow) system to maintain a waste solute concentration which is always lower on the dialysate side of the membrane. The gradient persists along the entire length of the membrane.
second principle ultrafiltration caused by convective flow of solutes and liquids

CVVH is continuous veno-venous haemofiltration. This involves Filtration and fluid replacement. Runs continuously. Takes much longer than HD, but better tolerated cardiovascularly. Therefore useful in ITU and in CVS patients”.
no dialysate
relies on hydrostatic pressure alone to produce ultrafilatration
fluid replaced either before or after ultrafiltration
more haemodynamic stability

24
Q

diffusion vs convection in HD vs HF

A

HD there is concentration gradient between blood and dialysate which allows diffusion of waste production
the driving force is the concetration gradient

haemofiltration
the driving force is the transmembrane pressure
movement due to convection between blood and fitlrate

25
HD circuit components
``` A arm B Blood pump C anti coagulant D dialyser E air dectector ```
26
complications of HD
``` thrombosis vascular access issues vascular disease infection BP shifts and hypotension QOL mortality ```
27
mortality on HD
48% 4 yr survival | 24% if older than 65 years
28
fistula options
radiocephalic brachiocephalic brachiobasilic synthetic grafts
29
how does fistula work
to dialysi machine more distal but proximal to av graft site from dialysis machine needle more proximal blood coming from atery into vein
30
principle of PD treatment
``` dialysate put into peritoneal cavity dwell time then drained out performed several hours manually or with cycler ``` 2l bags of dextrose osmotic gradient across peritoneum need to get wast products out of peritoneum before dextrose absorbed Dialysate has a sugar in it that pulls fluid and waste from your blood into the dialysate. PD uses your peritoneum as a filter. The dialysate holds on to the waste and fluid and removes them from your body when you do an exchange
31
malignancy clear time before transplant
Patients with a history of cancer Traditionally disease free for >2 and preferably >5 years Minimise risk of recurrence Accelerated neoplastic growth post transplantation with immunosupppression in some cancers Customised approach based on prognosis from Oncologist/Specialist Malignancy death vs Dialysis death
32
which cancers wait 5 years 3
breast colon malignant melanoma
33
UTIs in transplant management
Optimise other medical issues (e.g. DM) – MDT approach, Adjust immunosuppression, ‘simple measures’ [fluid intake, pro-biotics, topical oestrogen, d-mannose] Antibiotics [low dose px, self start Rx, Methanamine Hippurate (minimal data)], Medical and surgical treatment of bladder dysfunction [BOO Rx, anti-ch/botox for poor complicance/high pressures, ISC (although avoid ‘plastic’ in Tx if poss)], native nephrectomy, anti-reflux transplant ureter options.
34
CI to receive transplant 6
Uncontrolled malignant disease Uncontrolled infectious disease Any condition with a life expectancy less than 5 years* (generally half life of graft) Active substance abuse * quality of life (free of dialysis), return to employment, improved exercise, sexual function including pregnancy, quality of life for family, cost- particularly live donation Reversible renal failure Not surgically fit for the procedure
35
``` complications transplant urological 3 vascular 4 wound GI ```
urological MUC 4-8% ureteric obstruction urinoma urine leak stent migration ``` vascular renal artery stenosis infarction AV fstula pseudoaneurysm renal vein thrombosis ```
36
other complications transplant
``` persistent secondary hyper parathydoisism increased risk stones malignancy - skin, kaposi, lymphoma rejection post transplant lymphoproliferative disease infection - pneuonia, CMV, UTI long term immunosuppresion side effects HTN Diabetes ```
37
tissue typing pre transplant 3
abo HLA cytotoxic crossmatch
38
HLA class I and II
part of human MHC present antigen to T cells MHC class I CD8 T cells - HLA A, HLA B on all nucleated cells MHC class II CD4 t cells HLA DR, HLA DQ, HLA DP on b lymphocytes, activated t cells, monocytes, macrophages, dendritic cells degree mismatch recorded for A, B and DR eg 0:0:1 greater mismatch, lower graft survival
39
what is lymphocytotic cross match
Detect recipient circulating cytotoxic antibodies against HLA antigens on donor T cells
40
complications renal failure
``` fluid overload hyperkaelamia acidosis cardiovascular disease anaemia pericarditis renal osteodystrophy htn ```
41
diasylate solution | contents 8
``` water sodium pottasium calcium magnesium chloride bicarbonate and glucose PH 7.1 to 7.3 ```
42
complications fistula
``` brachial fistulae higher rate of steal due to higher flow rates thrombosis stneosis ischaemia of digits infection aneurysm SVC obstruction extravasation to limbs ```