---
title: "init(_:)"
framework: healthkit
role: symbol
role_heading: Initializer
path: "healthkit/hkelectrocardiogramquerydescriptor/init(_:)"
---

# init(_:)

Creates a query descriptor that reads voltage measurements from the provided electrocardiogram sample.

## Declaration

```swift
init(_ electrocardiogram: HKElectrocardiogram)
```

## Parameters

- `electrocardiogram`: An electrocardiogram sample that contains voltage measurements.