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Calculations Flashcards

1
Q

Vd/Vt ratio?

A
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2
Q

Predict PaO2 by age

A
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3
Q

Calculate Static Compliance

A
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4
Q

Calculate Dynamic Compliance

A
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5
Q

Alveolar Gas Equation

A
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6
Q

AA Gradient

A
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7
Q

CO?

A

HR * SV

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8
Q

Stroke Volume 1?

A
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9
Q

Stroke Volume 2

A
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10
Q

EF?

A
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11
Q

MAP?

A
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12
Q

Pulse Pressure?

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13
Q

SVR?

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14
Q

O2 Carrying Capacity? (CaO2)

A
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15
Q

O2 Delivering? (DO2)

A
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16
Q

Coronary Perfusion Pressure?

A
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17
Q

Maximum Allowable Blood Loss? (MABL)

A
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18
Q

Cerebral Perfusion Pressure?

A
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19
Q

Anion Gap?

A
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20
Q

Plasma Osmolarity ?

A
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21
Q

Uncuffed ETT for Children

A
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22
Q

Cuffed ETT for Children?

A
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23
Q

O2 remaining in tank?

A
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24
Q

Fraction of inspired oxygen? (FiO2)

A
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25
Q

How to calculate Hct?

A

Hgb x 3

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26
Q

LMA sizes?

A
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27
Q

Max positive pressure ventilation with mask or LMA?

A

20 cm H2O

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28
Q

Max cuff pressure in LMA?

A

40- 60 cm H20

29
Q

Combitube Sizes

A
30
Q

Combitube Pressures

A
31
Q

Gas Laws

A
32
Q

Universal Gas Laws

A
33
Q

Burn Fluid Calculations

A
34
Q

Fluid Maintenance

A
35
Q

Fluid Deficit Calculations?

A

of Fasting hours * Maintenance rate

36
Q

Final Products of Soda Lima

A
37
Q

Tank Capacities

A
38
Q

SpO2 calculation?

A
39
Q

SpO2 Wavelengths?

A
40
Q

BP cuff calculations?

A
41
Q

What is the transpulmonary pressure?

A

Pressure inside vs outside the lungs

TPP = Alveolar Pressure - Interpleural pressure

MUST stay positive to keep airways open

42
Q

Normal Dead Space on an adult?

A

70kg adult = 150mL

Vd = 2mL * kg

43
Q

Normal Oxygen consumption ? (VO2)

A

VO2= CO * (CaO2-CvO2) * 10

Normal

3.5ml/kg/min

250mL/min on a 70kg male

44
Q

What does it mean when the Oxyhemoglobin Dissociation Curve moves left?

A

Left = Love

The Hgb wants to hold on to the Oxygen

45
Q

What causes a left shift on the Oxyhemoglobin Dissociation Curve?

A

Decrease Temp
Decrease 2,3, DPG
Decrease hydrogen
Alkalosis
Increased pH
Decreased Hydrogen
HgbMet
HgbCO
HgbF

46
Q

What causes a right shift on the Oxyhemoglobin Dissociation Curve?

A

Increased everything and acidosis

Increased temp
Increased 2,3 DPG
Increased CO
Increased H
Acidosis
Decreased pH

47
Q

What is the Bohr affect?

A

An increased partial pressure of CO2 causes the Hgb to release O2

The Bohr scares the O2 off

48
Q

Glycolysis creates 1 glucose into?

A

2 Pyruvic acid

(2 ATP)

49
Q

How much ATP does the krebs cycle produce?

A

2 ATP

50
Q

How much ATP does oxidative phosphorylation (electron transport) create?

A

34 ATP

51
Q

How is the majority of CO2 transported in the blood?

A

Bicarb

52
Q

What is the Haldane effect?

A

Describes carriage of CO2.

Oxygen causes the erythrocyte to release CO2

53
Q

Where in the body is the CO2 Dissociation Curve shifted to the Right? To the Left?

A

Right - Lungs (so the CO2 is eliminated)

Left - capillaries so the CO2 can be loaded on

54
Q

What causes a Right shift in the CO2 response curve?

A

Narcs
Anesthetics
NMB
Sleep
Alkalosis
Carotid Enterectomy

55
Q

What is the pacemaker of normal breathing?

A

Dorsal Respiratory Center

Ventral is for exhalation

Pneuomotaxic inhibits the DRC while apneustic stimulates the DRC

56
Q

Neuro control of breathing?

A

Medulla

57
Q

What is the central chemoreceptor stimulated by?

A

pH changes in the CSF

58
Q

Can CO2 or H diffuse through the BBB?

A

CO2 - yes
H - no

59
Q

What do the peripheral chemo receptors respond to ? Where are they? Which nerve?

A

PaO2 - increases ventilation when drops below 60

Carotid bodies and aortic arch

Hering’s nerve (glossopharyngeal nerve)

60
Q

Which surgical procedure impairs the hypoxic ventilatory response?

A

Carotid enterectomy

61
Q

Which reflex prevents over breathing?

A

Hering-Breuer Inflation reflex

62
Q

Which drugs impair HPV?

A

Volatile anesthetics > 1.5 MAC
Vasodilators
PDE
Hypervolemia
Excessive PEEP

63
Q

Which electrolyte abnormality is most likely to occur in acute respiratory acidosis?

A

Hyperkalemia

64
Q

What is coronary blood flow equation?

A

CPP = Aortic DPB - LVEDP

65
Q

What is the most important determinant of coronary vessel diameter?

A

Local metabolism

66
Q

Which part of the myocardium is most prone to ischemia?

A

LV subendocardium

67
Q

When are the coronaries perfused?

A

Diastole

68
Q

When do most periop MI’s occur?

A

24-48 hours after surgery and have a 20% mortality

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