Normal and critical values for intubation/ Weaning Parameters/ calculations

Question 1

Normal pH

Answer 1

7.35-7.45

Question 2

Critical pH for intubation

Answer 2

<7.25

Question 3

Normal PaCO2

Answer 3

35-45

Question 4

Critical PaCO2 for intubation

Answer 4

> 55 and rising

Question 5

Normal ratio of dead space to tidal (VD/VT) range

Answer 5

0.3-0.4

Question 6

critical ratio of dead space to tidal (VD/VT) for intubation

Answer 6

> 0.6

Question 7

Normal PaO2

Answer 7

80-100 mm Hg

Question 8

Critical PaO2 for intubation

Answer 8

<70 (on O2 >0.6)

Question 9

Normal P(A-a)O2

Answer 9

5-20

Question 10

critcial P(A-a)O2 for intubation

Answer 10

> 450 (on O2)

Question 11

normal PaO2/PAO2

Answer 11

0.75

Question 12

critical PaO2/PAO2 for intubation

Answer 12

<0.15

Question 13

normal PaO2/FiO2

Answer 13

475

Question 14

critical PaO2/FiO2 (P/F ratio) for intubation

Answer 14

<200

Question 15

Normal MIP (NIF or pIMAX)

Answer 15

-100 to -50

Question 16

critical MIP (NIF or pIMAX) for intubation

Answer 16

-20 to 0

Question 17

Normal Maximum expiratory pressure (MEP)

Answer 17

100

Question 18

Critical Maximum expiratory pressure (MEP) for intubation

Answer 18

<40

Question 19

normal Vital capacity (range)

Answer 19

65-75

Question 20

critical vital capacity for intubation (range)

Answer 20

<10 to 15

Question 21

normal Tidal volume

Answer 21

6-8

Question 22

critical tidal volume for intubation

Answer 22

<5

Question 23

normal RR (f)

Answer 23

12-20

Question 24

critical RR(f) for intubation

Answer 24

> 35

Question 25

normal Forced expired volume at 1 sec (FEV1) range

Answer 25

50-60

Question 26

critical Forced expired volume at 1 sec (FEV1) for intubation

Answer 26

<10

Question 27

Normal Peak expiratory flow (PEF) (range)

Answer 27

350-600

Question 28

critical Peak expiratory flow (PEF) for intubation (range)

Answer 28

75-100

Question 29

**Equations** Minute ventilation

Answer 29

VE= VT x RR

Question 30

Alveolar ventilation

Answer 30

VA= (VT-VD) x RR

Question 31

Static compliance

Answer 31

Cs= VT/Pplat-PEEP (big # goes on inside)

Question 32

Dynamic compliance

Answer 32

Dyna= VT/ PIP-PEEP (big # goes on inside)

Question 33

Airway resistance

Answer 33

Raw=PIP-Pplat/ Flow (L/sec divide by 60) (Big # goes on the inside)

Question 34

Ideal Body Weight (IBW)

Answer 34

M- 106+6 (H-60)/2 F- 105+ 5 (H-60)/2

Question 35

Tidal volume

Answer 35

VE=VT x RR (small # goes on the inside and move the decimal 3 times) (find out the VT)

Question 36

Respiratory rate

Answer 36

VE=VT x RR (small # goes on inside move the decimal) (find out the RR)

Question 37

VD/VT ratio

Answer 37

Paco2-Peco2/Paco2 (small # goes on inside)

Question 38

Systemic Vascular Resistance

Answer 38

SVR= (MAP-CVP)/Q x 80

Question 39

Pulmonary Vascular Resistance (PVR)

Answer 39

PVR=(MPAP-PAOP)/Q x 80

Question 40

Mean arterial pressure

Answer 40

MAP= CO x SVR and MAP= Volume/ Capacity

Question 41

Cardiac output

Answer 41

CO=HR x SV

Question 42

**Weaning parameters (ok to extubate)** Vital capacity (VC)

Answer 42

>15 mL/kg

Question 43

**Weaning parameters (ok to extubate)** Minute ventilation VE (range)

Answer 43

<10 to 15

Question 44

**Weaning parameters (ok to extubate)** VT (range)

Answer 44

>4 to 6mL/kg

Question 45

**Weaning parameters (ok to extubate)** f (RR)

Answer 45

<35 breaths/min

Question 46

**Weaning parameters (ok to extubate)** f/Vt (RSBI)

Answer 46

<60 -105 breaths/min/ L (spontaneously breathing pt)

Question 47

**Weaning parameters (ok to extubate)** Ventilatory pattern

Answer 47

Synchronous and stable

Question 48

**Weaning parameters (ok to extubate)** Pimax (NIF or MIP)

Answer 48

<-20 to -30 cm H20

Question 49

**Weaning parameters (ok to extubate)** P 0.1

Answer 49

0 to -2 cm H20

Question 50

**Weaning parameters (ok to extubate)** WOB

Answer 50

<0.8 J/L

Question 51

**Weaning parameters (ok to extubate)** oxygen cost of breathing

Answer 51

<15 % total V02

Question 52

**Weaning parameters (ok to extubate)** Dynamic compliance

Answer 52

>25 mL/cm H20

Question 53

**Weaning parameters (ok to extubate)** VD/Vt

Answer 53

<0.6

Question 54

**Weaning parameters (ok to extubate)** CROP index

Answer 54

>13 mL/breaths/min

Question 55

**Weaning parameters (ok to extubate)** PaO2

Answer 55

greater than or equal to 60 (FiO2 <0.4)

Question 56

**Weaning parameters (ok to extubate)** PEEP (range)

Answer 56

less than or equal to 5- 8 cm H20

Question 57

**Weaning parameters (ok to extubate)** PaO2/FiO2 (P/F ratio)

Answer 57

>250 mm Hg (consider at 150- 200 mm Hg)

Question 58

**Weaning parameters (ok to extubate)** PaO2/ PAO2

Answer 58

>0.47

Question 59

**Weaning parameters (ok to extubate)** P(A-a)O2

Answer 59

<350 mm Hg (FiO2=1)

Question 60

**Weaning parameters (ok to extubate)** %Qs/ Qt (range)

Answer 60

<20% to 30%