Israeli start-up Oxitone literally keeps a “watch” on blood-oxygen levels affecting the heart. Two optical lasers are built into an oximeter that sits on the wrist. GE Healthcare chose Oxitone from 400 companies and is the only foreign company to join GE’s entrepreneur program.
http://mfa.gov.il/mfa/innovativeisrael/sciencetech/pages/catching-heart-attacks-on-time-3-august-2014.aspx