Hi Tricia -
Sorry to hear of your sister's heart troubles.. I wish her well.. thoughts & prayers.
I had my first cardiac 'episode'at 46 yrs old .. came out of the blue .. baffled the experts. I experienced a year of hell while trying to solve the problem ... Modern medicine does amazing things. I know I am lucky to be alive! .. blessed. Wishing the same good fortune for your sister.
Joanne