The phrase "a certain heart" is correct and usable in written English.
It can be used when referring to a specific type of heart or emotional state without naming it directly, often in a poetic or metaphorical context.
Example: "In the depths of her sorrow, she found a certain heart that resonated with her pain."
Alternatives: "a particular heart" or "an unspecified heart".
If you're in an accident, AutoBot can notify friends and family members—a certain heart attack causing SMS.
First, the moving heart phantom has a fixed ejection fraction and cardiac output at a certain heart rate, whereas in patients the functional parameters may vary.
Convenient wrist-watch style heart rate monitors are available at most major sporting supply stores, as they are popular with athletes like distance runners who wish to train at a certain heart rate.
The miser imagines there's a certain sum to fill his heart,But for sorrow there's no remedy.It requires what it cannot hope.We've known each other, earth, a long time.
For persons suffering from a "life-threatening" disease, defined as patients with certain heart conditions or cancer patients, a maximum national waiting time is defined.
That's going to be a big thing for users with certain heart diseases.
You should not ride a roller coaster if you have certain heart conditions, back and neck problems, or pregnancy due to G-forces issues.
At a certain sustained heart rate, he says, the brain releases a growth hormone that repairs and stimulates cerebral health.
A mathematical analysis of heartbeat patterns can detect certain heart disorders with unerring accuracy.
Two additional doses are needed for people who are pregnant, have a weak immune system, are HIV positive, or have diabetes, kidney disease and/or certain heart conditions.
Despite lower rates of certain heart attacks, the actual rates of death for the drugs were similar.
