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Phgy 210 > Formulas > Flashcards

Formulas Flashcards

1
Q

Expression for pressure with respect to surface tension

A

P=4T/r

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2
Q

What is Tidal volume?

A

Amount breathed in/out during a normal breath

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3
Q

What is inspiratory reserve volume?

A

The amount you can breath in past a normal breath

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4
Q

What is expiratory reserve volume?

A

The amount you can breath out past a normal breath

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5
Q

What is residual volume?

A

The amount always left in your lungs

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6
Q

What is vital capacity? (Equation)

A

Tidal volume+inspiratory reserve volume+expiratory reserve volume

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7
Q

What is functional residual capacity? (Equation)

A

Expiratory reserve volume+residual volume

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8
Q

What is inspiratory capacity? (Description+equation)

A

Tidal volume+inspiratory reserve volume. The maximum amount you can breath in after exhaling to FRC

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9
Q

What is total lung capacity? (Equations with only 2 values)

A

FRC+IC=VC+RV

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10
Q

Expression for VE

A

VE=VT x f
VT = tidal volume, f = number of breaths per minute

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11
Q

Expression for Px

A

Px = PFx
P = total pressure, Px = partial pressure of gas, Fx = fractional concentration in dry gas

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12
Q

Expression for VO2 (measured by comparing [O2] in the expired gas collected in a large spirometer)

A

VO2= Q (CaO2 - CVO2) or Q= VO2/ (CaO2 – CVO2)
VO2: measured by comparing [O2] in the expired gas collected in a large spirometer, [O2] in inspired gas; CaO2: measured from an artery; CVO2: measured via a catheter from the pulmonary artery. Q=cardiac output

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13
Q

Expression for compliance

A

C = V / P (change in volume/change in pressure)

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14
Q

Expression for Elastance

A

Elastance= 1/compliance

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15
Q

Transpulmonary Pressure expression

A

Pl = Palv - Ppl

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16
Q

Chest Wall Pressure expression

A

Pw = Ppl - Pbs (therefore Pbs = Ppl - Pw)

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17
Q

Expression for flow with respect to Palv and Patm.

A

Flow=deltaP/R=(Palv-Patm)/R

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18
Q

Resistance of airways expression with respect to Palv and Pao

A

Raw = (Palv – Pao)/Flow
Raw = resistance of the airways, Pao = Pressure of the airway opening pressure

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19
Q

Expression for flow (Fick’s law of diffusion)

A

Flow: = D x (Cout - Cin)/d x A
D: diffusion coefficient
Cout: Concentration out
Cin: Concentration in
d: Thickness of the membrane
A: Surface Area

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20
Q

Expression for flux in the cardio unit.

A

Flux = Flow/Area = D x (Cout - Cin)/d

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21
Q

Normal blood volume value

A

5L or 75mL/kg

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22
Q

1 unit of blood value

A

450mL

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23
Q

Stroke Volume (SV)

A

70 mL

24
Q

Normal cadiac output value

A

5000mL/min or 5L/min

25
Q

Expression for flow (with respect to volume)

A

delta V/t

26
Q

Expression for flow (with respect to velocity)

A

mean velocity*area

27
Q

General expression for pressure

A

Pressure=Force/Area

28
Q

Normal blood pressure value

A

120/80mmHg (The first value is systolic, the second is diastolic)

29
Q

Central venous pressure value

A

5-10 cm H20

30
Q

Expression for volume–>general

A

Volume = A x h (Area x Height)

31
Q

Expression for mass

A

Mass = density x volume = ρV = ρAh

32
Q

Expression for force

A

Force = mass x acceleration = ρAhg

33
Q

Expression for pressure–>general

A

Pressure = Force/Area = ρhg

34
Q

Perfusion Pressure expression

A

ΔP = Pin - Pout
Across an organ, it’s specifically… ΔP = Pa - Pv

35
Q

Flow with respect to perfusion pressure

A

Flow = Perfusion Pressure/Resistance

36
Q

Poiseuille’s Law

A

R = 8νL/πr^4
ν = viscosity
r = radius
L = length of the vessel

37
Q

Resistance in Series

A

R = R1 + R2 (flow is the same)

38
Q

What is the same in series?

A

Flow

39
Q

What is the same in parallel?

A

deltaP

40
Q

Expression for Resistance in Parallel

A

1/R = 1/R1 + 1/R2

41
Q

How do you find lead 1?

A

Lead 1=VLarm - VRarm

42
Q

How do you find lead 2?

A

Lead 2=VLleg - VRarm

43
Q

How do you find lead 3?

A

VLleg - VLarm=Lead 3

44
Q

VLarm + VRarm + VLleg = ….

A

0

45
Q

Expression for transmembrane voltage.

A

ΔV = Vinside -Voutside

46
Q

Expression for stroke volume

A

SV = End diastolic volume - end systolic volume = EDV - ESV

47
Q

Expression for ejection fraction

A

Ejection fraction = SV/EDV

48
Q

Expression for cardiac output

A

CO = Heart rate x SV

49
Q

Expression for MAP (mean arterial pressure) with respect to CO

A

MAP= CO x TPR (total peripheral resistance)

50
Q

Expression for MAP (mean arterial pressure) with respect to SV and HR

A

MAP = SV x HR x TPR

51
Q

Expression for MAP with respect to relevant pressures

A

MAP = Diastolic Pressure + ⅓ (pulse pressure)

52
Q

DCO2 with respect to DO2

A

DCO2=20DO2

53
Q

Time constant expression.

A

t=RC

54
Q

Max HR?

A

220-age in years

55
Q

Fick’s principle for VO2.

A

VO2=CO*(arterialO2-venousO2)

Phgy 210 (1 decks)

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