An enhanced method and device are provided to treat atrial fibrillation or inhibit or reduce restenosis following angioplasty or stent placement. The HFIP hydrolyzable precursor is a compound, other than sevoflurane itself, that has an intact 1,1,1,3,3,3-hexafluoroisopropoxy moiety2CHO\u2014, and contains one or more moieties susceptible to acidic hydrolysis, such that HFIP is released upon such treatment. The system then selects one or more of these pieces of data andor activities from a certain time period and gathers them into timeline units based on their relatedness and their relevance to users. Finally, the method displays the reduced electronic document on the digital handheld device screen, and allows a user to switch between the original and reduced documents.