Will AFib History be an open data source?

I’ve recently started looking at retrieving ECG data in HealthKit, as currently recorded by my Watch (mine’s on 8.7). I already have a database of ECG recordings from my Polar H10 strap and want to incorporate the Watch data (from a different lead position).

i note that HealthKit now has an HKElectrocardiogram sample [https://developer.apple.com/documentation/healthkit/hkelectrocardiogram), which has a property for classification e.g. “atrialFibrillation”. So, we should be able, now, to do an HKQuery to retrieve AFib classifications with or without the voltage data. I haven’t tried yet, but soon will.

I hope this helps.

Regards, Michaela

PS I’ve developed an ECG Viewer with SwiftUI Canvas for the voltage time series ( currently Polar H10 data) and will be adding the capability for plotting the Watch data.

I can confirm that current versions of iOS and Watch OS (14+ and 7+) provide access to ECG classifications (e.g. Atrial Fibrillation). The relevant code is:

let ecgType = HKObjectType.electrocardiogramType() 
let ecgPredicate = HKQuery.predicateForElectrocardiograms(classification: .atrialFibrillation)
let ecgQuery = HKSampleQuery(sampleType: ecgType,
                                     predicate: ecgPredicate,
                                     limit: HKObjectQueryNoLimit,
                                     sortDescriptors: nil) { (query, samples, error) in ...............

If you then need to access the actual ECG Voltages (500 measurements per second, I think) for a sample:

let voltageQuery = HKElectrocardiogramQuery(ecgSample) { (query, result) in
            switch(result) {
            case .measurement(let measurement):
                if let voltageQuantity = measurement.quantity(for: .appleWatchSimilarToLeadI) {
                // process each voltage measurement
                ...........
}
// Execute the query.
        healthStore.execute(voltageQuery)

Regards, Michaela