Self-explanatory domain name with a clear, medical purpose.
The name "CardiacGuard" has 12 letters and three syllables. Successful brands using three syllable names include Microsoft, Toshiba and Adidas.
Cardiacguard.com is a .com domain. Dot com domains are the most desirable top-level-domain in the world, used by famous websites like youtube.com. Once secured, a .com all but guarantees no-one else can outrank you for your own name in the long run.