The British Medical Journal published an article [BMJ 2005;330:581 (12 March)] by Garrido et al. reporting the results of a retrospective, serial, cross sectional study on the effect of electronic health records (EHR) in ambulatory care.
They concluded that readily available, comprehensive, integrated clinical information reduced use of ambulatory care while maintaining quality and allowed doctors to replace some office visits with telephone contacts. Shifting patterns of use suggest reduced numbers of ambulatory care visits that are inappropriate or marginally productive
See the full article at: Effect of EHR in ambulatory care.