"Bradycardia" and "Sinus Bradycardia"

[David Hudak]

Hi organizers,

I would like to ask a question:

What is the difference between using the label "Bradycardia" and the label "Sinus Bradycardia"?

Each Sinus Bradycardia is also Bradycardia, nevertheless there are only six ECG signals with Bradycardia label in training data.

Does it mean that "Bradycardia" is reserved only for cases caused by other circumstances or diseases than lower sinoatrial node frequency?

Thanks in advance

David

[PhysioNet Challenge]

Hi David,

Thanks for the question. In the full training data, there are 2,359 SB and 288 Brady. These are how they are code in the respective databases and we don't have further information on why different centers label it as bradycardia vs sinus bradycardia. However, since multiple labels can exist for any given recording, bradycardia doesn't necessarily indicate sinus rhythm.  You would have to check the other labels. 

If only one label exists, then it's possible you could assume there is no evidence of other rhythms present, but we can't be sure.  This depends on the practices at each individual center.  This uncertainty is in many ways, part of the challenge. 

Best,

Erick

(On behalf of the Challenge team)

https://physionetchallenges.github.io/

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