Apple Watch Able to Detect Abnormal Heart Rhythm With 97% Accuracy

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The Apple Watch's built-in heart rate monitor is 97 percent accurate when detecting the most common form of an abnormal heart rhythm when paired with an algorithm to sort through the data, according to a new study conducted by the University of California, San Francisco and the team behind the Cardiogram app (via TechCrunch).

There were 6,158 participants in the study, all of whom used the Cardiogram app on the Apple Watch to monitor their heart rate. Most were known to have normal EKG readings, but 200 suffer from paroxysmal atrial fibrillation (an occasional irregular heartbeat).


Data from these participants, along with data taken from normal Cardiogram users, was used to build a neural network that could recognize the abnormal heart rhythms solely from data collected by the Apple Watch. As of today, Cardiogram says its algorithm can almost always successfully determine when a patient is in atrial fibrillation.
In order to validate the model, we obtained gold-standard labels of atrial fibrillation from cardioversions. In a cardioversion, a patient experiencing atrial fibrillation is converted back to normal sinus rhythm, either chemically or with a shock to the heart. 51 patients at UCSF agreed to wear an Apple Watch during their cardioversion.

We obtained heart rate samples before the procedure, when the patient was in atrial fibrillation, and after, when patient's heart was restored to a normal rhythm. On this validation set, our model performed with an AUC of 0.97, beating existing methods.
Cardiogram is a startup that's aiming to garner more information from the data collected by the Apple Watch. The study, which Cardiogram has raised funding for, started in March of 2016 and will continue as UCSF and Cardiogram work to refine the neural network and detect other conditions beyond atrial fibrillation.

Cardiogram plans to put in additional work before using its algorithm to start notifying Cardiogram users of arrhythmias. The company needs to conduct further testing to make sure the algorithm works in a variety of conditions and it needs to work on scaling it so it can be used continuously by all Cardiogram users.

The Cardiogram app can be downloaded from the App Store for free. [Direct Link]

Article Link: Apple Watch Able to Detect Abnormal Heart Rhythm With 97% Accuracy
 
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JaySoul

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Jan 30, 2008
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Potentially awesome.

I think a lot of people are waiting on two big things:

1) Really accurate heart-rate monitoring (getting there)

2) Blood sugar analysis for diabetics.

I have a feeling Apple will get there within a decade, fingers crossed.
 

now i see it

macrumors 68040
Jan 2, 2002
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Using a device (A-watch) to tell you when you're heart is skipping beats is like having a device to tell you when you're getting cramps. Every missed heart beat is is easily felt and unpleasant enough as it is without some damn device reminding you of it.
 
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brandonballinger

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does this work with series 1 too? Looking into buying one soon.
(Cardiogram developer here) Yes—we're compatible with all Apple Watch hardware as long as you're on watchOS 3.
[doublepost=1494535132][/doublepost]
Using a device (A-watch) to tell you when you're heart is skipping beats is like having a device to tell you when you're getting cramps. Every missed heart beat is is easily felt and unpleasant enough as it is without some damn device reminding you of it.
Atrial fibrillation is often asymptomatic—Circulation (the top cardiology journal) just published a big report on the evidence for device-based screening of AF:
circ.ahajournals.org/content/135/19/1851.full?ijkey=StzSPk8eljGaP2G&keytype=ref
 

BruceEBonus

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My iPhone already makes all my important decisions for me mentally - now the Apple Watch will tell me when I am having a cardiac arrhythmia, positional hypotensive episode and/or haemodynamic compromise without me having to pay make any thought processes whatsoever. That's good then isn't it? Hang on. I'll just consult my iPhone. Hello? Siri? I'm feeling a tad dizzy and nauseous. Could you ask Apple Watch if I should call an ambulance, please?. Damn. Battery low .... :confused: ...must ... charge ...phone .....
 
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dypeterc

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It'll be a long time before this comes to market. And from what it looks like, Apple doesn't want to have to go through the hassle of FDA approval for its devices.
 

brandonballinger

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burgman

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Using a device (A-watch) to tell you when you're heart is skipping beats is like having a device to tell you when you're getting cramps. Every missed heart beat is is easily felt and unpleasant enough as it is without some damn device reminding you of it.
Sorry not even close, many strokes are caused by silent AFib with few symptoms. Getting FDA approval for this is difficult. Another Company, Kardia has a Apple Watch band that they have been waiting for a long time.
 

dypeterc

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xbankaiz

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Potentially awesome.

I think a lot of people are waiting on two big things:

1) Really accurate heart-rate monitoring (getting there)

2) Blood sugar analysis for diabetics.

I have a feeling Apple will get there within a decade, fingers crossed.
If these two can even remotely get into the 99% accuracy level with the Watch Series 3 or even 4, then finally, the Watch will be really worth it. Oh, and of course, better battery life with Quick Charging capabilities, so that one can track sleep instead of letting the AW charge overnight.
 
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Cycling Asia

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Using a device (A-watch) to tell you when you're heart is skipping beats is like having a device to tell you when you're getting cramps. Every missed heart beat is is easily felt and unpleasant enough as it is without some damn device reminding you of it.
But while you're doubled over in pain on the floor of your apartment (in which you live alone), the app on your phone has already called for an ambulance (or a provided contact).
 
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mcLamer

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May 11, 2017
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97% accuracy?

A classifier like

state predictState() {
return "No problems!"
}

will have 200 errors on your data, archiving 96.7% of accuracy.

p.s. The idea is great and I hope to see it implemented in future watches
 
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