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Maddy - First Aid > Equations > Flashcards

Equations Flashcards

1
Q

flow rate

A

change in pressure/resistance

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2
Q

resistance

A

(8 x viscocity x length) / (pi x radius^4)

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3
Q

velocity

A

flow/cross sectional area

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4
Q

reynold’s number

A

(density x diameter x velocity) / viscocity

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5
Q

capacitance/compliance

A

volume/pressure

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6
Q

mean arterial pressure

A

(2/3 x diastolic) + (1/3 x systolic)

or

CO X TPR

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7
Q

stroke volume

A

EDV - ESV

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8
Q

pulse pressure

A

SBP - DBP

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9
Q

cardiac output

A

SV X HR

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10
Q

ejection fraction

A

SV/EDV

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11
Q

tension of vessel

A

(pressure x radius) / (2 x wall thickness)

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12
Q

clearance in kidney

A

(urine concentration x urine flow rate) / plasma concentration

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13
Q

effective renal plasma flow

A

urine concentration of PAH x (urine flow / plasma concentration of PAH)

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14
Q

renal blood flow

A

renal plasma flow / (1- Hct)

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15
Q

filtered load in kidney

A

GFR x plasma concentration

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16
Q

excretion rate in kidney

A

urine flow x urine concentration

17
Q

osmolarity

A

(2 x Na) + (glucose/18) + (BUN/2.8)

18
Q

GFR

A

KF [(glomerular capillary hydrostatic pressure - bowman space hydrostatic pressure) - (glomerular capillary oncotic pressure - bowman space oncotic pressure)]

*bowman space oncotic pressure is assumed to be 0

or

GFR = urine concentration of inulin x (urine flow rate/plasma concentration of inulin)

19
Q

plasma volume

A

total body volume x (1 - Hct)

20
Q

filtered fraction

21
Q

volume of distribution

A

amount of drug in body/plasma drug concentration

22
Q

clearance of drug

A

rate of elimination of drug/plasma drug concentration

23
Q

loading dose

A

(target plasma concentration at steady state x volume of distribution) / bioavailability

24
Q

maintenance dose

A

(target plasma concentration at steady state x clearance x dosage interval) / bioavailability

25
Q

therapeutic index

A

median toxic dose/median effective dose

Maddy - First Aid (23 decks)

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