Calculations Flashcards

1
Q

Estimating heart rate from an ECG tracing

A

300# of lage boxes b/n R wave

1500/# of small boxes b/n R

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2
Q

Pulse pressure

A

Systolic pressure -diastolic pressure

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3
Q

MAP

A

MAP =(2x diastolic)+systolic/3

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4
Q

Cardiac output(duck equation)

A

Qt=vo2/C(a-v)o2(10)

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5
Q

Cardiac output(stroke volume equation )

A

qt =heart rate x stroke volume

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6
Q

Stroke volume

A

Qt/heart rate

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7
Q

Cerebral perfusion pressure (CPP)

A

CPP=MAP-ICP

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8
Q

Cardiac index

A

CI=qt/BSA= cardiac output/body surface area

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9
Q

Systemic vascular resistance (SVR)

A

MAP-CVP/Cardiac output

To convert to dynes,multiply mmgh/l/min by 80

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10
Q

Pulmonary vascular resistance (PVR)

A

(MPAP-PWP)/cardiac output

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11
Q

PAO2

A

(Pb-ph2o)x FIO2-PaCO2/0.8

Paco2 X1.25

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12
Q

A-aDo2

A

PAO2-Pao2

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13
Q

Pao2/FIO2 ratio or P/f ratio

A

Pao2 \ FIO2

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14
Q

Ca02

A

(Hbx1.34xSa02)+(Pa02x.003)

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15
Q

Cv02

A

(Hb x 1.34 x SvO2) + (Pv02 x 0.003)

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16
Q

C(a-v)O2

17
Q

Q_t

A

VO2/C(a-v)O2 *10

18
Q

VO2

A

QtC(a-v)O210

19
Q

Qs/Qt

A

(A-aDO2).003/ (A-aD2).003 +C(a-v)O2

20
Q

SaO2

A

Pao2 +30(when Pa02 is b/n 40 and 60 torr

21
Q

Oxygen index(OI)

A

Paw x FIO2/PaO2 x100

22
Q

Vd/vt

A

Paco2-PEco2/Paco2 * 100

23
Q

Desired minute volume

A

(VEPaCo2)=(VEPaCO2)

24
Q

Suction catheter size

A

Catheter size =ID size/2 *3u

25
To approximate FIO2 with a nasal cannula
For every 1 L/min.increase in flow rate FIO2 increase by 4% | 20 +(4*L)= approximate FI02
26
Ideal body weight
50kg+(2*inches over 5ft + 2 m -2 f
27
Exhaled Tidal volume (VT)
(Ve\f)
28
VE
Vt*f
29
Alveolar minute ventilation (vA)
(Vt-vd)*f | Use the approximation of ml per Lb. of ideal body weight for vd
30
Dynamic compliance
Exhaled volume/(peak inspiration pressure -peep)
31
Static compliance
Exhaled volume/plateau pressure -peep
32
Airway resistance(Raw)-estimate
Raw peak pressure-plateau pressure
33
Work of breathing
P x v or change in pressure x change in volume
34
Rapid shallow breathing index (RSBI)
Respiratory Rate \vt(L)
35
He/02 | Mixture using an oxygen flowmeter
Actual flow= indicate flow * factor
36
He/O2 factors:
80/20 mixture:1:8 | 70/30 mixture 1.6
37
Volume lost through chest tubes
Deliver tidal volume-exhaled tidal volume=lost volume
38
Patient's maximum heart rate:(220-age in years)
Patient's maximum heart rate:(220-age in years)