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Nefrologia PT > Formulas and Numbers > Flashcards

Formulas and Numbers Flashcards

1
Q

Na deficit

A

TBW x (Desired Na - Actual Na)

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2
Q

Amount of Na in fluids

A

PNSS 154
D5W 0
0.45 NaCl 77
3% NaCl 513

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3
Q

Plasma Osm

A

2Na + Gluc/18 + BUN/2.8

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4
Q

Osmolal gap

A

measured Osm - Computed Osm

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5
Q

Osm Gap > 10

A

Toxins

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6
Q

FeElectrolyte

A

UrineE x Serum Crea / UCrea x SerumE

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7
Q

Free water excretion

A

(Una + UK)/Serum Na X UO (L)

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8
Q

Urine Crea Normal

A

F 15-20 mkd; M 20-25 mkd

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9
Q

Renal Mg wasting

A

Urine Mg > 24 g/day; FeMg 3-4%

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10
Q

Renal K Wasting

A

UK> 15; UK/crea > 1.5

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11
Q

Glucose in PD solution

A
  1. 5%: 15-22 g
  2. 5%: 24 - 40 g
  3. 25%: 45 - 60 g
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12
Q

steroid equivalent; 1 mg pred

A

dexa 0.2
methlypred 0.8
hydrocort 4
cortisone 5

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13
Q

AG

A

Na - (Cl + Hco3)
normal 8-12

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14
Q

Corrected AG

A

AG - [(4.5-Alb) x 2.5]

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15
Q

UAG

A

UNa + UK - UCl

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16
Q

Positive UAG

A

RTA Type 1, 4, renal failure

17
Q

Hco3 deficit

A

(Desired - Actual) x 0.5 x wt

18
Q

K deficit

A

Desired - Actual/0.27 x 100

19
Q

TTKG

A

UK x POsm/PK x UOsm

20
Q

TBW deficit

A

140-PNa/140 x TBW factor x wt
M: 0.6, F 0.5

21
Q

Compensation for Respiratory acidosis

A

Acute: Dhco3 = 0.1 (DPco2)
Chronic: Dhco3 - 0.2 (Dpco2)

22
Q

Compensation for Respiratory alkalosis

A

Acute Dhco3 = 0.2 (DPco2)
Chronic DHco3 = 0.5 (DPCo2)

23
Q

Compensation for Met Acid

A

Pco2 = 1.5(HCO3) + 8

24
Q

Compensation for Met Alk

A

Pco2 = 0.5 (HCO3)

25
Q

FeMg

A

UMg x PCrea / (0.7 x PMg x UCr)

26
Q

DAG > DHco3 or DAG/DHCO3 > 1

A

metabolic alk + HAGMA

27
Q

DAG < DHCO3 or DAG/DHCO3 < 1

A

HAGMA + NAGMA

28
Q

DAG/DHCO3 = 1

A

pure HAGMA

29
Q

DAG/DCl > 1

A

NAGMA + metalk

30
Q

DAG/DCl < 1

A

NAGMA + HAGMA

31
Q

DAG/DCL =1

A

pure NAGMA

32
Q

Crcl cockroft

A

(140-age) x wt/crea x 72
F x0.85

33
Q

Urinary excretion rate = Filtration rate- reabsorption +secretion

A

GFR = Kf x [(PG-PB)-(πG- πB)]

PG :Hydrostatic pressure inside the glomerular capillaries, which promotes filtration =60mmHG

PB :The hydrostatic pressure in bowman’s capsule , which opposes filtration=18mmHg

Πg:The colloid osmotic pressure of the glomerular capillary plasma proteins, which opposes filtration=32

Πb: The colloid osmotic pressure of the proteins in bowman’s capsule ,which promotes filtration = Kf x [(60-18)-(32- 0)] = 12.5 X 10 = 125 ml/min or 180 L/day Kf=glomerular capillary filtration coefficient depends on permeability and surface area of filtration barrier

34
Q

Filtration fraction: It is the ratio of GFR to renal plasma flow Filtration fraction = GFR /RPF

35
Q

CLEARANCE ou DEPURAÇÃO PLASMÁTICA

A

Taxa em que um soluto é excretado

INDICA O VOLUME DE PLASMA QUE FICA TOTALMENTE LIVRE DO SOLUTO POR UNIDADE DE TEMPO

Eficiência com que os rins excretam substâncias Avaliação geral da saúde dos rins Depuração = taxa de excreção / concentração plasmática Depuração = [Us] x Vu / concentração plasmática

 Volume urinário = 450ml/h  Concentração de Na+ na urina = 15mmoles/l  Concentração plasmática de Na+ = 145mmoles/l Depuração = (15mmoles/l x 7,5ml/min) / 145mmoles/l Depuração = 0,8ml/min

Usada clinicamente para estimar o RFG e o fluxo plasmático renal Se substância é livremente filtrada e não é reabsorvida nem secretada, a quantidade da substância na urina é igual a filtrada Volume de plasma filtrado é aquele totalmente depurado da substância, isto é, a depuração é igual aoTFG Depuração inulina = TFG = [Us] x V / concentração plasmática

36
Q

se Taxa excretada = Carga fitrada

FE = Taxa excretada / Carga fitrada = 1

A

substancias que sao mto reabsorvidas FE <1

SUBSTANCIAS QUE SAO MTO EXCRETADAS FE>1

Nefrologia PT (112 decks)

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