a close up person`s finger using a pulse oximetry, noninvasive method for monitoring people`s oxygen saturation

background beat blood cardiac cardio cardiogram cardiograph cardiology care clinic close detector electronic emergency equipment finger graph hand health heartbeat help idea indicator injured level man measure medic medicals medicine meter method modern monitor monitoring noninvasive oximetry oxygen patient people peoples percent personal persons pulse rate resuscitation saturation senior sensor technology urgent using value vital