Respiratory Mechanics

Update! This has been turned into an app called VentICalc!

This Excel document contains the following tabs that will help you understand the respiratory mechanics of your patient during mechanical ventilation. Download link below. I’ve kept the Excel sheet available for download, as it contains a QTc calculator (not available in VentICalc), which is important in COVID-19.

  • VC mode: this is the preferred ventilation mode for ARDS, as it allows you to perform basic respiratory mechanics at the bedside. With an inspiratory hold (to obtain Pplat) and expiratory hold (to obtain PEEPtot), it’s easy to get information on driving pressure, safe tidal volume, respiratory system compliance and mechanical power.
  • PS mode: calculate the Pmus and predicted transpulmonary pressure by measuring the occlusion pressure as proposed by Bertoni et al.
  • Lactate: doesn’t help with respiratory mechanics (sorry), but by using a central venous gas you can calculate whether or not lactate formation may be due to oxygen deprivation (a.k.a. anaerobic lactate) or whether lactate is formed despite adequate oxygen levels (a.k.a. aerobic lactate).
  • QTc: due to the COVID19 crisis, I’ve temporarily added a QTc calculator, as Chloroquine causes QTc prolongation.

Disclaimer: Please note that this document may be subject to error and change. Drop me a line if you find any mistakes! This document should not be used as a stand alone decision making tool, it should not be construed as medical advice, nor is it a substitute for professional medical expertise or treatment. By using this Excel document, you are fully responsible for the interpretation! I’m just trying to help 🙂

Download Respiratory Mechanics Excel sheet here!

Or, even better, visit to use it as an app! It works perfectly on a browser (Mac/PC) as well as on mobile!