Measuring for heart attack

Last couple of years I have been listening to so many stories where people who were on the driving seat had a heart attack and died while driving.
I wonder why car manufacturers do not put a heart rate meter or a meter for measuring pulse on the steering wheel.
If one can put such measuring instruments on treadmill or cycles particlarly smart meters which show ranges going into red or danger zone etc.why not in cars. The machine can be battery operated connected to the car battery or have one for itself.
Many lives can be saved and the driver will maybe decide to not commence on his last journey at all.