Carolinas HealthCare System wants to improve care and reduce hospital stays for its sickest patients by using virtual medical care. The Charlotte health-care system is putting the finishing touches on a $12.3 million, virtual critical-care project, slated to open on Tuesday. The 3,200-square-foot command center in Mint Hill will allow for 24/7 remote monitoring of patients in intensive-care units across the health-care system's footprint. The command center will rely on audio and video to monitor patient data, such as lab results, blood-pressure readings and heart monitoring. Hospital personnel and the command center will be able to communicate around the clock about a patient's condition and concerns.