The first guy was not a client but my lover. I was having an affair with a married guy and we were having sex when he started to feel pain in his arm, creeping to his shoulder.
My neighboor across the hall was a nurse, so I ran to his apartment and he carried my lover to his place and called the ambulance.
He was barely conscious when my neighboor was telling him "you were at my house? you hear me?" and dressing him up.
The ambulance took him and my neighboor went with them. I was a nervous wreck, not knowing what to do. Few hours later my neighboor called and said he was ok and his family was there.

The second guy was a regular of mine...but was not a heart attack.
I used to see him every week, until he disappeared for couple months. He called for an appointment and when I we were having sex I heard a loud crack and he rolled out of me to the floor screaming in pain. I panicked and then he told me he had a back surgery when he was away. The loud crack was a bone in his back.
I helped him to the bed and he told me to get some stuff out of his pocket, he could not move at all. So I got his pills, he took few of them and swallowed. He told me to call his brother and his doctor.
I called him and explained what happened. I dressed him up, the best way I could and waited for help to come.
His brother came over with two other guys and took him out of the hotel room. They could not call an ambulance, because of the situation, but they went direct to the hospital where the doctor was waiting for him.

In both cases, was a very scary experience...the first one was ok after few weeks, the second not.

Is always good to have a "plan B", specially if you have health problems.

See, I TOLD RC it was cases of TOW and not CRS.  Come to think of it, maybe CRS MIGHT work, afterall.  Gee honey, I just can't remember ANY of that...lol  Those paramedics must be CRAZY or something....