---
title: irregularHeartRhythmEvent
framework: healthkit
role: symbol
role_heading: Type Property
path: healthkit/hkcategorytypeidentifier/irregularheartrhythmevent
---

# irregularHeartRhythmEvent

A category sample type for irregular heart rhythm events.

## Declaration

```swift
static let irregularHeartRhythmEvent: HKCategoryTypeIdentifier
```

## Discussion

Discussion The system creates irregularHeartRhythmEvent samples whenever Apple Watch produces an irregular rhythm notification. For more information, see Heart rate notifications on your Apple Watch. The irregular rhythm samples are read-only. You can request permission to read the samples using this identifier, but you can’t request authorization to share them. This means you can’t save new irregular rhythm events to the HealthKit store. To add test data in iOS Simulator, open the Health app and select Browse > Heart > Irregular Rhythm Notifications > Add Data. These samples have a value of HKCategoryValue.notApplicable.

## See Also

### Vital signs

- [heartRate](healthkit/hkquantitytypeidentifier/heartrate.md)
- [lowHeartRateEvent](healthkit/hkcategorytypeidentifier/lowheartrateevent.md)
- [highHeartRateEvent](healthkit/hkcategorytypeidentifier/highheartrateevent.md)
- [restingHeartRate](healthkit/hkquantitytypeidentifier/restingheartrate.md)
- [heartRateVariabilitySDNN](healthkit/hkquantitytypeidentifier/heartratevariabilitysdnn.md)
- [heartRateRecoveryOneMinute](healthkit/hkquantitytypeidentifier/heartraterecoveryoneminute.md)
- [atrialFibrillationBurden](healthkit/hkquantitytypeidentifier/atrialfibrillationburden.md)
- [walkingHeartRateAverage](healthkit/hkquantitytypeidentifier/walkingheartrateaverage.md)
- [HKDataTypeIdentifierHeartbeatSeries](healthkit/hkdatatypeidentifierheartbeatseries.md)
- [HKElectrocardiogramType](healthkit/hkelectrocardiogramtype.md)
- [oxygenSaturation](healthkit/hkquantitytypeidentifier/oxygensaturation.md)
- [bodyTemperature](healthkit/hkquantitytypeidentifier/bodytemperature.md)
- [bloodPressure](healthkit/hkcorrelationtypeidentifier/bloodpressure.md)
- [bloodPressureSystolic](healthkit/hkquantitytypeidentifier/bloodpressuresystolic.md)
- [bloodPressureDiastolic](healthkit/hkquantitytypeidentifier/bloodpressurediastolic.md)