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

Detecting a heart murmur on your own can be tricky. A murmur is an extra heart sound that can be heard by a stethoscope.

Notice too that the patient’s heart sounds are eliminated, allowing lung sounds to come through clearly. The implications of an effective, affordable noise-canceling stethoscope can’t be ...