---
title: HKElectrocardiogram.Lead.appleWatchSimilarToLeadI
framework: healthkit
role: symbol
role_heading: Case
path: healthkit/hkelectrocardiogram/lead/applewatchsimilartoleadi
---

# HKElectrocardiogram.Lead.appleWatchSimilarToLeadI

Apple Watch Series 4 or later.

## Declaration

```swift
case appleWatchSimilarToLeadI
```

## Discussion

Discussion The Apple Watch’s heart rate sensor generates and analyzes ECG data similar to a Lead I ECG.