Cardiovascular Equations and Calculations Quiz
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Questions and Answers

What is the Fick equation used to calculate?

  • Oxygen consumption at the muscle (correct)
  • Blood flow to the muscle
  • Carbon dioxide production at the muscle
  • Oxygen saturation in the blood

What is the conversion factor for 1 kg·m/min to kcal/min?

  • 0.00234 kcal/min (correct)
  • 0.00198 kcal/min
  • 0.00456 kcal/min
  • 0.00345 kcal/min

What is the equation to convert watts to kg·m/min?

  • kg·m/min = (watts)/(4.18)
  • kg·m/min = (watts)/(6.12)
  • kg·m/min = (watts)(6.12) (correct)
  • kg·m/min = (watts)(4.18)

What does the Oxyhaemoglobin dissociation curve illustrate?

<p>The relationship between oxygen and hemoglobin saturation (C)</p> Signup and view all the answers

What does the Fick equation calculate if Q = 5 L/min, a-vO2diff = 50 mL/L, and VO2 = ?

<p>250 mL O2/min (A)</p> Signup and view all the answers

What is the output of CO2 if VCO2 expired = 50 L/min and VCO2 inspired = 0.15 L/min?

<p>1.86 L/min (D)</p> Signup and view all the answers

What is the energy expenditure in kcals if the oxygen consumption is 1 L/min?

<p>5 kcals (C)</p> Signup and view all the answers

What does the equation VCO2 = (50 L/min*0.375) - (50 L/min * 0.003) calculate?

<p>Output of CO2 (D)</p> Signup and view all the answers

What is the equation for mean arterial pressure (MAP)?

<p>$MAP = \frac{1}{3} SBP + \frac{2}{3} DBP$ (C)</p> Signup and view all the answers

What is the formula for ejection fraction (EF), which represents the percentage of blood ejected from the heart?

<p>$EF = \frac{SV}{EDV} \times 100$ (B)</p> Signup and view all the answers

What is the equation for resistance in the context of flow and pressure?

<p>$Resistance = \frac{pressure}{flow}$ (B)</p> Signup and view all the answers

What does the VD/VT ratio measure in the context of gas exchange efficiency?

<p>Alveolar ventilation efficiency (A)</p> Signup and view all the answers

What does the a-vO2diff (arterial venous oxygen) represent?

<p>Difference in oxygen content between arterial and venous blood (C)</p> Signup and view all the answers

What is the formula for mechanical efficiency, expressed as a percentage?

<p>$\text{Mechanical efficiency} = \frac{\text{external work accomplished}}{\text{energy expended (VO2)}} \times 100$ (B)</p> Signup and view all the answers

What is the formula for gross efficiency, where WR represents work rate in kg·m/min?

<p>$\text{Gross efficiency} = \frac{WR \times 0.00234 , \text{kcal/min}}{VO2 \times 5 , \text{kcal/L O2/min}}$ (B)</p> Signup and view all the answers

What is the equation for net efficiency, where (VO2,2-VO2,1) represents the change in oxygen consumption?

<p>$\text{Net efficiency} = \frac{WR \times 0.00234}{(VO2,2-VO2,1) \times 5}$ (C)</p> Signup and view all the answers

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