### Lung Compliance: The Ability to Stretch

If you’ve been around respiratory care or pulmonary medicine any length of time, you are likely very familiar with the idea of both lung compliance and airways resistance. The concept of compliance is arguably the […]

### A Review of the Usefulness of the Winter’s Formula: Predicted PaCO2 = 1.5 x [HCO3-] + 8 + 2

So here we are… not another formula, right? No worries. This one is actually quite straight forward and relatively easy to work out. The tricky part lies in the interpretation of the result – isn’t […]

### Oxygen Tank Duration Calculator

If you don’t have access to the calculator above simply use the following formula to calculate the minutes remaining in your oxygen tank:  Here’s what you will need: Tank size & conversion factor for that […]

### Understanding Oxygenation: The Alveolar-arterial Gradient

Formula: PAO2 – PaO2 = P(A-a)O2 The Alveolar-arterial gradient (A-a gradient) is a mathematical equation that calculates how difficult it is for oxygen to cross the alveolar-capillary membrane. The equation utilizes two pressures; The partial […]