*4.4.1.1 Smartphone applications*

Smartphone applications can be used to measure blood sugar levels and blood pressure, heart rate, and even blood oxygen fullness, and to monitor sleep, stress levels, and the activities of patients with advanced heart failure. In the light of the patient information evaluated, smartphone applications can be used as a retrospective record store with the related records of the patient status [41]. In addition, it can function as a reminder of drugs taken at previously defined times and as a list of symptoms, signs and drugs when the status of the patient worsened.
