I don't know about AD4K, but I was in the hospital for a diagnostic a couple of days ago, and they were still using VGA monitors, which didn't make me feel especially confident since my diagnostic involved technology.
The medical industry as a whole is staggeringly slow to replace anything technology. I'm a bit surprised at something as simple as what type of connector they're using for their monitor, but not jaw-droppingly slow.
I use an old VGA monitor with my modern desktop that I found in my school's recycling bins. I only use it as a second monitor but I can confirm VGA monitors are still fine for displaying simple text/monitoring software. No point in throwing it out if it works and isn't a security risk.