Does anyone have any advice regarding medical response systems for elders who live alone?

Many of them are good. Just be sure you don't have to sign a contract, as you don't want to be stuck with one if your father goes to a nursing home.

If you want some direction (there are many online), you could call a local in-home agency or your local hospital. They should be able to guide you.

These alarms are wonderful. I made use of them for several of my elders and I encourage you to look into one.

Carol