FiO2Calculator.github.io/bbHIW.html at main · FiO2Calculator/FiO2Calculator.github.io · GitHub

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    <h4>FiO2 Calculator</h4>
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  <div class="page-content">
    <h5>More details on Benaron-Benitz:</h5>
    <p>
      The Benaron-Benitz model implements the formula derived by Benaron DA & Benitz WE, <a
        href="https://pubmed.ncbi.nlm.nih.gov/8130865/">Arch Pediatr Adolesc Med., Mar.
        1994;148(3):294-300</a> :
    </p>
    <img class="eq-img" src="bb.png" />
    <br />
    <p style="line-height: 1.5;">
      Here the tidal volume \(V_T = 5.0\times W\) (ml), with weight \(W\) (kg), and the inspiratory rate through the
      nose \(\dot V_{nose}=\frac{f_{nose}\times V_T}{T_I}\) (ml/s) with \(f_{nose}\) the fraction of inspiratory
      flow which is inspired through the nose and \(T_I\) (s) the inspiratory time.
      The atmospheric oxygen concentration (\(F_{atm,O_2}\)) and the nasal cannula concentration (\(F_{nc,O_2}\)) are
      both
      measured as a percentage of oxygen.
    </p>
    <p>
      This formula is proportional to cannula flow rate and blender percentage (\(B\)), and inversely proportional to
      weight through
      tidal volume.
    </p>
    <p>
      In the construction of this model, Benaron and Benitz assume a respiratory rate of 65 breaths/min, constant nasal
      flow
      over the inspiratory cycle and that the upper airway does not act as a reservoir. For their model to be most
      accurate to
      their empirical measurements, it is recommended to use \(V_T\) = 5.0 ml/kg, \(T_I\) = 0.3 s and \(f_{nose}\) =
      0.67, which are the
      values used in this implementation.
    </p>
    <p>
      This model is recommended for use for flow rates up to 2000 ml/min as that is the maximum value considered to be
      low-flow. It should be noted that respiratory rate is assumed
      for all patients so it may be a source of inaccuracy for patients with a respiratory rate much lower (or higher)
      than 65 breaths/min.
    </p>
    <p>If selecting flow rate for the preferred output, the formula above is inverted to solve for \(F\).</p>
    </br>
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      <b>Note:</b> This Page uses MathJax to display equations under the <a
        href="https://github.com/mathjax/MathJax/blob/master/LICENSE">Apache License, Version 2.0</a>.
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