# Comparison of SpO2 and heart rate values on Apple Watch and conventional commercial oximeters devices in patients with lung disease

## TL;DR

This study compares Apple Watch and commercial oximeters for measuring oxygen levels and heart rate in lung disease patients, finding them equally reliable.

## Contribution

Demonstrates the reliability of Apple Watch for SpO2 and heart rate measurements in lung disease patients compared to commercial devices.

## Key findings

- Apple Watch Series 6 shows strong correlation with commercial oximeters for heart rate (r = 0.995) and SpO2 (r = 0.81).
- No statistical difference in measurements due to skin color, wrist circumference, hair, or nail enamel.
- Apple Watch is reliable for SpO2 and heart rate in lung disease patients in controlled settings.

## Abstract

Lung diseases have high mortality and morbidity, with an important impact on quality of life. Hypoxemic patients are advised to use oxygen therapy to prolong their survival, but high oxygen saturation (SpO2) levels can also have negative effects. Pulse oximeters are the most common way to assess oxygen levels and guide medical treatment. This study aims to assess whether wearable devices can provide precise SpO2 measurements when compared to commercial pulse oximeters. This is a cross-section study with 100 patients with chronic obstructive pulmonary disease and interstitial lung disease from an outpatient pneumology clinic. SpO2 and heart rate data were collected with an Apple Watch Series 6 (Apple) and compared to two commercial pulse oximeters. The Bland–Altman method and interclass correlation coefficient were used to compare their values. We observed strong positive correlations between the Apple Watch device and commercial oximeters when evaluating heart rate measurements (r = 0.995, p < 0.001) and oximetry measurements (r = 0.81, p < 0.001). There was no statistical difference in the evaluation of skin color, wrist circumference, presence of wrist hair, and enamel nail for SpO2 and heart rate measurements in Apple Watch or commercial oximeter devices (p > 0.05). Apple Watch 6 is a reliable way to obtain heart rate and SpO2 in patients with lung diseases in a controlled environment.