Disclosed are wearable devices, such as rings and bracelets, for monitoring and diagnosing cardiovascular conditions of a wearer, along with related systems, algorithms and methods. The disclosed wearable devices can continuously monitor the wearers cardiovascular status by measuring heart rate, motion, blood oxygenation, and/or other properties of the wearer. Disclosed wearable devices can further comprise three EKG electrodes, including a first electrode on the inner surface adapted to detect a signal from the finger/wrist, a second electrode on the outer surface adapted to detect a cardiovascular signal from a finger of the opposing hand, and a third electrode on the outer surface of the frame adapted to detect a cardiovascular signal from a EKG lead location on the wearers chest or leg. The wearable devices can be linked wirelessly to a mobile device that the person can interact with, and can further be linked to other distributed system components and healthcare providers.
