• support@fourthfrontier.com
  • Can anyone give me details on what “other” rythm is during continuous ecg? i get about 17-20 percent “other” throughout the night.

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    • I think that “other rhythm” is a tricky measure. The algorithm analyses your ECG and tries to determine if something is outside the periodical rhythm of your heart. The analysis is done after the recording. Doing a bit of reverse engineering, the formula for calculation is %NOR = #NOR * 100 / (3*TT), where #NOR is the total number of “other” and…Read More

      • This is exacyly why I think we need to see the %other both the way it is currently calculated and also the raw calculation that tells us what % of heartbeats is ‘ectopic’. For example, if you slept for 10 hours – that’s 1,800 , 20 second segments. So the device saying that your ‘other %’ is 20% could mean that 20% of these segments have just a…Read More

        • Thanks for pointing this out. We are trying to improve our visualisation of ectopics, particularly for our users on the recently launched, FDA Cleared FX+ device. Your suggestion is very helpful.

    • I asked the same question during a Q&A with support when I first got mine, and was told that any HR reading below 50bpm overnight would register as “Other”. That’s the threshold.

      • The algorithms on the FX2 classify rhythms in the categories of “Normal”, “Other”, and “Noisy”. Any rhythms that display clean ECG signals and are identified to be other than “Normal Sinus Rhythm” are classified “Other”. As suggested by Geoff, when the HR drops to 50 bpm, this is typically considered as Bradycardia by clinicians and ther…Read More

        • Hello, I have the same issue. When sleeping many people especially fit people will have a resting HR less than 50. My doctor said this is perfectly normal. I wish there was setting where we could adjust the lower limit to about 40-45 bpm which for many people at rest is perfectly normal. Thanks

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  • Brand new here. Can one set up the EKG to alert real time for Atrial Tachycardia or Atrial Flutter? Also, I see the 20 second EKG strip but from what part of the workout is that taken from and where is the rest?

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    • The 20 second EKG strip is the one corresponding to where the cursor is on the colour banded ‘heart rate’ section. I cycle through the entire recording by using the right cursor arrow on my keyboard to advance it one 20 second section at a time

  • Hello. Finally got the app installed and played around with my X2. How do people use their device? Only when they exercise or all day? Any tips for a brand new user? Thank you. Happy Saturday!

  • How do I set my heart strain settings ?

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