Now, more than ever, you need access to online education

Become equipped with a tool belt of 700+ online CPD resources to help strengthen your professional practice!


Korotkoff sounds are generated when a blood pressure cuff changes the flow of blood through the artery. These sounds are heard through either a stethoscope or a doppler that is placed distal to the blood pressure cuff.

There are five distinct phases of Korotkoff sounds:

Phase 1: A sharp tapping.

This is the first sound heard as the cuff pressure is released. This sound provides the systolic pressure reading.

Phase 2: A swishing/whooshing sound.

Swishing sounds as the blood flows through blood vessels as the cuff is deflated.

Phase 3: A thump (softer than phase 1).

Intense thumping sounds that are softer than phase 1 as the blood flows through the artery but the cuff pressure is still inflated to occlude flow during diastole.

Phase 4: A softer, blowing, muffled sound that fades.

Softer and muffled sounds as the cuff pressure is released. The change from the thump of phase 3 to the muffled sound of phase 4 is known as the first diastolic reading.

Phase 5: Silence.

Silence that occurs when the cuff pressure is released enough to allow normal blood flow. This is known as the second diastolic reading.

Learn more about blood pressure here:


4 Total Rating(s)
Generic portrait
Joseph Mapuor
26 Mar 2020

Great sound of Korotkoff and transcript.

Generic portrait
kathy wu
24 Mar 2020


Generic portrait
Edward Craig Berry
23 Mar 2020

A good short video providing basic information regarding sounds heard while taking a BP

Generic portrait
Ruth Angus
23 Mar 2020

very interesting to understand more in depth about Bp

Portrait of Judy Berry
Judy Berry
22 Mar 2020

Informative and to the point. Easy to understand.

Portrait of ronit tzabari
ronit tzabari
22 Mar 2020