Important Formulas

what is the equation for cardiac output, and what does each variable mean

Q=HR*SV

• Q= cardiac output- volume/min

• HR= heart rate- beats per minute

• SV= stroke volume- volume of blood ejected per beat

what is the equation for stroke volume and what does each variable mean

SV=EDV-ESV

• SV= stroke volume- volume of blood ejected per beat

• EDV= end diastolic volume- volume of blood in the ventricle before contraction and during filling

• ESV- end systolic volume- volume of blood left in the ventricle after contraction

what is the equation for alveolar ventilation, and what does each variable stand for

VA = (TV-DS)*fB

• VA= the volume of air that reaches the alveoli and respiratory areas per minute

• TV= tidal volume- the volume of air that is breathed out during a normal breath

• DS= dead space- the volume of air that stays in conducting airways and does not participate in gas exchange

• fB= breathing frequency- the number of breaths taken per minute

what is the equation for minute ventilation and what does each variable stand for

VE = TV*fB

• VE= minute ventilation- total volume of air moved in and

  out of the lungs in one minute

• TV= tidal volume- the volume of air that is breathed out during a normal breath

• fB= breathing frequency- the number of breaths taken per minute

what is the equation for particle pressure

pGas= concentration * pB

pGas= particle pressure- the individual pressure exerted by a gas

pB= barometric pressure- the pressure of the atmosphere (760 mmHg)

what is the equation for net filtration pressure and what does each variable mean

NFP = (BHP + IFOP) - (BCOP + IFHP)

• BHP+IFOP= filtration

• BCOP+IFHP= reabsorption

what is the equation for vital capacity and what do the variables mean

vital capacity= IRV + TV + ERV

• TV= tidal volume- the volume of air that is breathed out during a normal breath

• IRV= inspiratory reserve volume- the max amount of air that you can inhale

• ERV= expiratory reserve volume- the max amount of air that you can exhale

what is the equation for total lung capacity and what do the variables mean

TLC=IRV + TV + ERV + RV

• TV= tidal volume- the volume of air that is breathed out during a normal breath

• IRV= inspiratory reserve volume- the max amount of air that you can inhale

• ERV= expiratory reserve volume- the max amount of air that you can exhale

• RV= residual volume- the air left over in the lungs after your max exhale, cannot be measured

what is ficks equation and what does each variable mean

VO₂ = Q * a-vO₂difference

• cardio*respiratory=metabolism

• VO2= total volume of O2 consumed

• Q= cardiac output- volume/min

• a-vO2= How much oxygen is dropped off at the tissues