https://techcrunch.com/2018/09/17/not-to-be-overshadowed-by-the-apple-watch-alivecor-announces-a-new-6-lead-ecg-reader/

Apple’s announcement last week of a Watch with an FDA-approved ECG reader to track heart health looked to be the undoing of original ECG reader company AliveCor. But, to prove it still has a hearty pulse, AliveCor tells TechCrunch it is coming out with a “never-before-seen” 6-lead electrocardiogram (ECG), pending FDA approval.

In a care clinic, a patient typically has 12 leads, or stickers placed across their chest to pick up data from their heart. However, other ECG readers typically have one or two leads. The Apple Watch places a single lead system on the wrist. The 6-lead ECG reader is, in theory, more accurate because there are more sensors picking up more information, which could be critical in saving lives.