Which Korotkoff sound is associated with swishing sounds?

The second Korotkoff sound is characterized by a swishing or whooshing sound heard through a stethoscope while taking blood pressure. This sound occurs when blood starts to flow through the partially compressed artery. The presence of this swishing noise indicates that the pressure in the cuff has decreased enough to allow blood flow, but not high enough for the artery to be fully open. As the healthcare provider continues to release the pressure in the cuff, this sound is typically heard after the first sound, which signifies systolic pressure, and is part of the distinct phases that make up the Korotkoff sounds used to measure blood pressure.

The first Korotkoff sound is a sharp thud that indicates the systolic pressure. The third sound is a distinct, crisp sound that follows the swishing noise, and the fourth sound is a softer, muffled sound that indicates diastolic pressure in some cases. Understanding these sounds is essential for accurately measuring blood pressure and assessing cardiovascular health.