A new advance in health monitoring which uses radar to "listen" to patients' heart sounds with remarkable accuracy could lead to a new generation of contactless medical monitoring equipment.

The S1 heart sound is two of your heart valves closing. It's the first sound doctors can hear with a stethoscope. Learn what ...

Medically reviewed by Rafle Fernandez, MD A third heart sound, or S3, is a low-frequency, extra heart sound that may be heard ...