A monitoring system uses infrared photoplethysmography to monitor the pulse of a person wearing a wrist unit, and the wrist unit sends RF signals which describe his heart condition to a base unit. If the wrist unit detects a cardiac arrest or if the wearer manually signals an emergency, both the wrist...http://www.google.es/patents/US5228449?utm_source=gb-gplus-sharePatente US5228449 - System and method for detecting out-of-hospital cardiac emergencies and summoning emergency assistance
System and method for detecting out-of-hospital cardiac emergencies and ...
