atrialFibrillationBurden
A quantity type that measures an estimate of the percentage of time a person’s heart shows signs of atrial fibrillation (AFib) while wearing Apple Watch.
Declaration
static let atrialFibrillationBurden: HKQuantityTypeIdentifierDiscussion
On watchOS 9 and iOS 16 and later, once a person enables AFib History, Apple Watch begins collecting heart-rhythm data more frequently. iPhone then calculates the AFib burden once a week, as long as Apple Watch has gathered enough heart-rhythm data during that week.
If iPhone is unlocked and isn’t under heavy load, it starts analyzing heart rhythm samples around 8:00 am Monday morning. As soon as it finishes this analysis, iPhone sends the user a notification telling them the results.
These samples use percentage units (described in HKUnit) and measure discrete values (described in HKQuantityAggregationStyle). The sample’s value represents an estimate of the percentage of time a person’s heart shows signs of AFib while wearing Apple Watch.
See Also
Vital signs
heartRatelowHeartRateEventhighHeartRateEventirregularHeartRhythmEventrestingHeartRateheartRateVariabilitySDNNheartRateRecoveryOneMinutewalkingHeartRateAverageHKDataTypeIdentifierHeartbeatSeriesHKElectrocardiogramTypeoxygenSaturationbodyTemperaturebloodPressurebloodPressureSystolicbloodPressureDiastolic