Fick Cardiac Output
04-11-2017, 04:22 AM
Post: #1 Eddie W. Shore Senior Member Posts: 1,133 Joined: Dec 2013
Fick Cardiac Output
Fick Cardiac Output Equations

The program FICK will calculate:

* CO: Cardiac Output (L/min)
* SV: Stroke Volume (ml)
* CI: Cardiac Index (L/(min/m^2))
* SI: Stroke Index (ml/m^2)

Given the following inputs:

* Ca: Arterial blood oxygen (O2) content percentage
* CvO2: Venous blood oxygen (O2) content percentage
* VO2: Oxygen compulsion (in ml per pure oxygen gas per minute, STPD)
* HR: Heart Rate in beats per minute (BPM)
* Height in cm
* Weight in kg

STPD: Standard Temperature Pressure Density

Conversion factors: 1 in = 2.54 cm, 12 in = 1 ft, 1 lb = 0.45359237 kg

Formulas:

CO = VO2 / (10 * (Ca - CvO2))
SV = CO * 1000/HR
CI = CO/BSA
SI = SV/BSA

BSA: body surface area, measured in cm^3. There are several formulas, but the Fick program uses the simple approximation formula:

BSA = √(weight * height)/60

HP Prime Program FICK

Code:
EXPORT FICK() BEGIN // Fick Cardiac Output // HP 65, 1972 // EWS 2017-04-10 // inputs LOCAL ca,cv,vo,hr,h,w; INPUT({ca,cv,vo,hr,h,w}, "Fick Cardiac Output", {"Ca O_2:","C_v O_2:","VO_2:","HR:", "Height:","Weight:"}, {"Arterial blood (%)", "Venous blood (%)", "O_2 compulsion (ml/min)", "Heart Rate (BPM)", "Height (cm)", "Weight (kg)"}); // calculation LOCAL co:=vo/(10*(ca-cv)); LOCAL sv:=co*1000/hr; // simple BSA LOCAL bsa:=√(w*h)/60; LOCAL ci:=co/bsa; LOCAL si:=sv/bsa; // output PRINT(); PRINT("Cardiac Output (l/min)"); PRINT(co); PRINT("Stroke Volume (ml)"); PRINT(sv); PRINT("Cardiac Index (L/(min/m^2))"); PRINT(ci); PRINT("Stroke Index (ml/m^2)"); PRINT(si); END;

Example:

Inputs:

* Ca: 19%
* CvO2: 15%
* VO2: 250 ml/min
* HR: 64
* Height: 5 ft 11 in, 180.34 cm
* Weight 196 lb, 88.90410452 kg

Results:

* CO: 6.25 L/min
* SV: 97.65625 ml
* CI: 2.96158586825 L/(min/m^2)
* SI: 46.2747791914 ml/m^2

Source:

Hewlett Packard. HP-67/97 User’s Library Solutions: Cardiac Corvallis, OR 1976 pg. 20
04-11-2017, 05:24 AM
Post: #2 Thomas Radtke Senior Member Posts: 751 Joined: Dec 2013
RE: Fick Cardiac Output
(04-11-2017 04:22 AM)Eddie W. Shore Wrote:  STPD: Standard Temperature Pressure Density
Ha! That's what Jack Daniels kept secret in his Running Formula and you have it here! Next time someone asks I'll point him here.
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