Math for Perfusion Technology

Question 1

BSA Calculation for Adults

Answer 1

Kg^0.425 x Ht^0.728 x 0.007184

Question 2

BSA Calculation for Infants (3-30 kg)

Answer 2

1321 + 0.3433 x Kg

Question 3

Inches into Centimeters

Answer 3

2.54cm/ 1 in

Question 4

Pounds into kilograms

Answer 4

2.24 lbs/ 1 kg

Question 5

mmHg into dyne/ cm^2

Answer 5

1330 dyne/cm^2/mmHg

Question 6

Torr into mmHg

Answer 6

1 Torr/ 1 mmHg

Question 7

mmHg into kilopascals

Answer 7

27.1 mmHg/ kPa

Question 8

mmHg into PSI

Answer 8

50.1 mmHg/ PSI

Question 9

Cardiac Output Equation

Answer 9

CO = HR x SV

Question 10

Cardiac Index Equation

Answer 10

CO/ BSA (L/min/m^2)

CO/ Kg (ml/min/kg)

Question 11

Normal Cardiac Index

Answer 11

2.2 - 4.0 L/min/m^2

60-150 ml/min/kg

Question 12

Stroke Volume Definition

Answer 12

the volume displaced by one beat of the heart or one RPM of a blood propelling device

Question 13

Ejection Fraction Definition

Answer 13

the fraction of the left ventricular end diastolic volume (EDV) that is ejected stroke volume

Question 14

Normal Ejection Fraction

Answer 14

40-70%

Question 15

Ejection Fraction Equation

Answer 15

(SV/EDV) x 100

Question 16

Tension-Time Index (TTI) Definition

Answer 16

a measure of systemic blood pressure for a given period of elapsed time, expressed as a measure of the adequacy of systemic perfusion pressure - also the Time -Tension Index may be used to express the duration of LV pressure creation magnitude for a period of time

Question 17

Tension-Time Index Equation

Answer 17

TTI = mABP in mmHg x Elapsed time in minutes x mmHg x min

Question 18

Left Ventricular Stroke Work Definition

Answer 18

the pressure work that the left ventricle performs to move the stroke volume from the LV end-diastolic pressure up to the mean aortic pressure up to the mean aortic pressure.

Question 19

SW correlates highly with ______________.

Answer 19

myocardial oxygen consumption

Question 20

Left Ventricular Stroke Work Index (LVSWI)

Answer 20

(SV/BSA) x (MAP-PCWP) x (0.0136)

Question 21

Normal Left Ventricular Stroke Work Index (LVSWI)

Answer 21

45-75 gm x m/m^2/beat

Question 22

Laplace’s Law

Answer 22

a law in physics that in medicine is applied in the physiology of blood flow; under equilibrium conditions the pressure tangent to the circumference of a vessel storing or transmitting fluid equals the product of the pressure across the wall and the radius of the vessel for a sphere and half this for a tube

Question 23

Blood Flow Calculation for a Roller Pump

Answer 23

BF = RPMs x SV mL blood/ min = revolutions/minx mL / revolution

Question 24

Calibration

Answer 24

roller pump calibration is begun by setting the roller pump occlusion to assure minimal or known backflow at zero RPM.

Question 25

Volume in 1ft of 1/8’’ tubing

Answer 25

2.4cc

Question 26

Volume in 1ft of 1/4’’ tubing

Answer 26

9.7cc

Question 27

Volume in 1ft of 3/8’’ tubing

Answer 27

21.7 cc

Question 28

Volume in 1ft of 1/2’’ tubing

Answer 28

38.6 cc

Question 29

Volume in 1ft of 5/8’’ tubing

Answer 29

60.3 cc

Question 30

Hematocrit Calculation

Answer 30

% Hct = (RBC vol/blood vol) x 100