A simple app for counting Respiratory Rate

The respiratory rate (how many times you breathe in one minute) is a very sensitive indicator on whether a patient is well or unwell. It is a vital part in all early warning scores. Indeed, it is often the first parameter that becomes abnormal.

Unfortunately, this is also a parameter is measured inaccurately and often omitted by healthcare professionals.

Reasons (and excuses) include:-

  1. Most bedside observation machines do not produce a number that people can write down unlike the Heart Rate, Blood Pressure, Oxygen Saturations
  2. Requires the clinicians (often healthcare assistants) to count how many breaths a patient takes per minute. Over 30 patients, this observation along can take 30mins. (people get lazy). The one minute is recommended is because unlike our pulse our respiratory rate can be quire irregular. (unless you are breathing very fast then it becomes more regular.)
  3. You need a watch with a secondhand/ stopwatch

As more and more hospitals progress towards digital collection of observations on smartphones, I’m proposing a simple application that counts respiratory rates that is accurate and that will require minimal ‘skill’ and training.

This is how it works:-

  1. Start the app
  2. It will have a BIG button in the middle of it that just says ‘Press here every time the patient breaths’
  3. The program will *figure* out how regular the patient is breathing to determine the length of time the observer needs to count. For eg. if the patient is taking 5 secs btw breaths and is very regular, 30 secs may be enough. But if it is 10secs, 1 min or more is required. Conversely if something is breathing every 2 secs, 15 secs of observation is more than enough. The accuracy of this algorithm can be refined in a field study.
  4. The app, gives you a respiratory rate
  5. THAT’s it

This will be simple enough to integrate into a observation recording tools like WardWare.

It is also simple enough to teach patients and their relatives how to do this themselves.

There are apps out there that can use the iPhone camera and/or motion sensors to do the same but that is much more complicated, less accurate and will require clearly defined hardware requirements. They will also have infection control issues.

Who wants to have a go, else I’m going to be proposing this for the next NHS Hackday





8 thoughts on “A simple app for counting Respiratory Rate

  1. I would use the phone placed on the upper abdomen/lower chest and use movement to count the resps.Would then release the nurse to be recording other vital signs whilst this was calculating.
    iPad has movement detection but not too certain if its in iPhones

    • YES PLEASE! 😉 Think it would be cool. Also we can build in a ‘trial’ mode where we will make everyone count for 1 min minimum and then collect loads of data to generate an algorithm to predict the minimum amount of time/ breathes that needs to be counted to make get 95% accuracy at 1 min.

  2. Pingback: 7 breaths is launched | The Rolobot Rambles

  3. Pingback: 7Breaths is born | Wai2k - Digital Doctor

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