The latest beta of Apple Watch watchOS 7.2 has added a new version of Apple's ECG monitoring system's algorithm, seemingly the first revision since the original.
Within the latest beta of forthcoming watchOS 7.2 for Apple Watch, Apple has included version 2 of its algorithm for working with ECG monitoring. Apple has also published bare minimum information about the algorithm, intended only to inform developers of its new name for their API calls.
Formally called "HKAppleECGAlgorithmVersion.version2" — the HK stands for Health Kit — there is no information about what features it adds or updates. However, it is also listed as being available or coming to iOS 14.3 and Mac Catalyst 14.3.