September 26, 2022 TD Staff Leave a Comment

Wake Technical Community College (Wake Tech) in Raleigh, N.C., the largest community college in the state, boasts a state-of-the-art EMS simulation suite. At the Perry Health Sciences Campus, students take courses that prepare them for certification as emergency medical technicians and paramedics. The training includes intensive, scenario-based instruction using simulation equipment to master the hands-on skills and critical thinking first responders must have to triage, diagnose and treat patients in emergency and trauma situations.

The Health Sciences Building includes an Emergency Medical Services simulation suite laid out like an apartment containing kitchen, living room, bedroom and bathroom settings equipped with high fidelity medical mannequins that instructors control from an adjacent control room. The instructors set up emergency scenarios, then monitor, guide and critique the actions of EMT and paramedic students through a direct observation window and via live and recorded video and audio feeds from multiple cameras. In addition, video and audio of the simulation sessions are recorded and streamed for viewing during debriefing sessions and for real-time peer reviews by students and instructors in remote viewing classrooms.

A major portion of the budget for the simulation suite went toward room construction and acquisition of the patient simulation system. The state-of-the-art patient simulation system includes several full-body, anatomically correct adult, infant and obstetric mannequins remotely controlled by software capable of presenting a broad set of clinical symptoms and vital signs under a variety of programmable scenarios. The audiovisual system is as important as the simulation system because it records and streams the video and audio events of the training sessions for debriefings and real-time observation by instructors and students. With the limited budget allocated to the suite’s AV system, the designers were intent on not over-engineering it. Yet, they also focused on assembling an AV system that was robust enough to support the important mission of preparing future lifesavers for their jobs, while keeping operation simple so as not to distract from training. Extron provided the project’s AV switching, distribution, control, and audio products.

To capture all the activity during training exercises, each of the simulation suite’s four “rooms” are equipped with a PTZ camera on the wall and a beam-tracking pendant microphone on the ceiling. An Extron DXP 84 HD 4K PLUS matrix switcher routes the HDMI video from the cameras. The simulation room mics, plus the instructor’s control room mic, feed into a digital audio distribution system that performs routing as well as digital signal processing for acoustic beam steering and acoustic echo cancellation.

Two of the HDMI outputs from the video matrix switcher connect to an SMP 352 dual recording streaming media processor. The SMP 352 also receives analog audio from the audio DSP. The SMP 352 records and streams training sessions from two simulation rooms simultaneously.

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The SMP 352 recordings are played back for debriefs to help students and instructors evaluate student performance. Recordings are saved to internal memory and to USB flash drives. Students can take the flash drives with them to review independently or to show others.

For realism, only the student EMT team that would be present for a real-life rescue are typically in a simulation room tending to a “patient.” But the SMP 352 streaming outputs can be sent over the network to overflow classrooms, or even over the internet via a soft codec such as Zoom, allowing larger student groups to observe real time or review recordings.

The simulation suite AV system is equipped with six 55″ flat panel displays to give observers a bird’s-eye view of the activity around each “patient.” One of these displays is located in the overflow classroom. The rest are mounted above the location of the mannequin in each simulation room. For example, in the living room setting, the display is above the foot of the sofa where the “patient” lies supine. In the bedroom, there are two 55″ displays – one above a bed, where an adult mannequin lies, and the other above a crib containing an infant mannequin.

All six displays show the same PTZ camera feed, as selected in the control room. The matrix switcher routes the selected PTZ camera HDMI video output to a DTP HD DA8 4K 230 distribution amplifier which extends the signal long-distances over DTP shielded twisted pair cable runs to the six displays. Mounted behind each display is a DTP HDMI 4K 230 Rx receiver that converts the signal from DTP to HDMI.

To accompany the video shown on the 55″ displays, the sounds captured by the ceiling mics in the simulation rooms are routed by the audio system to ceiling speakers in the simulation rooms. The AV control processor ensures that the sound heard from the speakers is from the same room being shown on the displays by commanding audio routing to select the mic feed from the same room as the currently selected PTZ camera. Sound from the selected microphone is also heard in the control room over a pair of SM 3 speakers that are driven by the stereo outputs of an MPA 152 Plus amplifier that receives its input from the audio DSP.

From the control room, instructors and their assistants can control the AV system and execute simulation scenarios from a single operator position. As seen in the images, a laptop on the desk directly in front of the instructor runs simulation software from Laerdal Medical Corporation, makers of the medical mannequins. This software can run pre-programmed simulation scenarios, or the instructor can operate the mannequins on-the-fly. Physiological parameters are set, trends initiated and actions logged. The Laerdal software provides “patient” vital signs to computer monitors in the simulation rooms.

A 24″ touchscreen monitor at the control room instructor desk is used to control the AV system. The Wake Tech AV team designed the AV control GUI and the Inter Technologies installation team configured the control system using Global Configurator Professional. An IPCP Pro 350 control processor commands all AV system components via a network switch. The touchscreen AV control user interface on the 24” monitor is implemented via a TLI PRO 101 TouchLink interface unit, allowing live HDMI video from the simulation room PTZ cameras to be displayed within the AV control GUI.

Jennifer Unitis, manager of Academic Computing, notes that since the beginning of her AV career, she has been hands-on with AV installations, whether creating designs, climbing ladders to run cables, or racking-up equipment. Being that close to the hardware, she realized early on the capabilities, ease of installation and operation, and reliability of Extron AV products. That’s made Unitis an enthusiastic Extron advocate wherever she’s worked. Along the way, she and her associates trained with Extron and earned several Extron AV technology certifications. When Unitis took her current position at Wake Tech, she notes, “I was glad to learn that the school is an almost 100 percent Extron campus, and that everyone on the AV team has one or more Extron certifications.”

Unitis affirms her AV team’s sentiments that “Extron was incredibly helpful in assisting with the design of the EMS simulation suite. They helped us create a solution that met all of our goals. We built a high-end simulation environment for a fraction of the normal cost of a system with this much capability. Faculty and students find the system easy to operate and are fully satisfied.” The simulation suite plays an integral role in helping Wake Tech meet its EMS program mission of “Serving the state of North Carolina as a leader in education for the emergency medicine profession.”

Tagged With: AV systems, EMS Training, Extron, Simulation

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