Opening multiple patients' charts in the electronic medical record simultaneously may increase the risk of wrong-patient orders, a known patient safety hazard. Researchers analyzed intercepted wrong-patient medication orders in an emergency department over a 6-year period and found no significant reduction when the maximum number of charts allowed to be open at the same time decreased from 4 to 2. Similarly, there was no significant increase when the maximum number of charts permitted to be open simultaneously increased from 2 to 4.