Post Reply 
Fick Cardiac Output
04-11-2017, 04:22 AM
Post: #1
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
Visit this user's website Find all posts by this user
Quote this message in a reply
04-11-2017, 05:24 AM
Post: #2
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.
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: 2 Guest(s)