Sienna Rhodes
Korotkoff sounds are the noises medical professionals listen for when taking blood pressure using a non-invasive procedure. They are named after Nikolai Korotkov, a Russian physician who discovered them in 1905. The sounds are produced by blood flow dynamics as the cuff pressure fluctuates relative to the arterial pressure. As the pressure in the cuff drops, the blood flow becomes turbulent and produces an audible sound. The five phases of Korotkoff sounds are used to determine someone's blood pressure.
| Characteristics | Values |
|---|---|
| What are Korotkoff sounds? | Sounds medical personnel listen for when taking blood pressure using a non-invasive procedure |
| Who are they named after? | Nikolai Korotkov, a Russian physician who discovered them in 1905 |
| What causes the sounds? | The sounds are produced by blood flow dynamics as the cuff pressure fluctuates relative to the arterial pressure |
| How are the sounds produced? | By the deformation of the underlying arteries and jetting of flowing blood |
| What is the controversy regarding the pediatric population? | Whether the fourth or fifth Korotkoff sound should be used as an indicator of diastolic blood pressure |
| What are the five phases of Korotkoff sounds? | Phase 1: Clear tapping sounds; Phase 2: Softening of tapping sounds and addition of a swishing sound; Phase 3: Sharper sounds; Phase 4: Muffled thumps; Phase 5: Silence |
| What do the phases indicate? | Phase 1: Systolic blood pressure; Phase 5: Diastolic blood pressure |
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What You'll Learn
The brachial artery is compressed, causing turbulent blood flow
Korotkoff sounds are named after Dr. Nikolai Korotkoff, a Russian physician who discovered them in 1905. They refer to the sounds heard through a stethoscope when checking blood pressure. These sounds are produced by blood flow dynamics as the cuff pressure fluctuates relative to the arterial pressure.
To measure blood pressure, a cuff is placed around the mid-upper arm and inflated to a pressure above the systolic pressure. This pressure from the cuff compresses the brachial artery, which is the main artery of the upper arm and is responsible for supplying blood to the arm and hand. When the cuff is inflated, the brachial artery is compressed, and blood flow is temporarily blocked. This compression of the brachial artery creates a state of turbulent blood flow, which is the key mechanism behind the production of Korotkoff sounds.
In a normal resting state, blood flows smoothly through the brachial artery in a laminar, non-turbulent manner, and no sound is produced that can be heard through a stethoscope. However, when the cuff is inflated above systolic pressure, the brachial artery is compressed, and the smooth blood flow becomes turbulent. This turbulence creates audible sounds, known as Korotkoff sounds, which can be heard through a stethoscope placed over the brachial artery.
As the pressure in the cuff is gradually released, the blood flow is reestablished, and the characteristic Korotkoff sounds are heard. These sounds are the result of the dynamic changes in blood flow as the pressure in the cuff fluctuates relative to the arterial pressure. The first Korotkoff sound, a sharp tapping sound, indicates the systolic blood pressure. As the cuff pressure continues to decrease, the sounds change in quality and intensity, progressing through phases of swishing sounds, softer thumps, and muffled thumps. Finally, when the pressure in the cuff drops below the diastolic pressure, the sounds disappear altogether.
The brachial artery compression and subsequent turbulent blood flow are crucial in producing the Korotkoff sounds, which are used to determine systolic and diastolic blood pressure readings during a standard blood pressure measurement procedure.
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The first Korotkoff sound is heard when cuff pressure matches systolic pressure
Korotkoff sounds are named after Nikolai Korotkov, a Russian physician who discovered them in 1905. They are the sounds that medical personnel listen for when taking blood pressure using a non-invasive procedure.
Korotkoff sounds refer to the series of five distinct sounds heard through a stethoscope over the brachial artery during blood pressure measurement. These sounds are produced by blood flow dynamics as the cuff pressure fluctuates relative to the arterial pressure.
The first Korotkoff sound is heard when the cuff pressure matches systolic pressure. This occurs because, as the pressure in the cuff matches the pressure produced by the heart, some blood is able to pass through the upper arm when the pressure in the artery rises during systole. This blood flows in spurts as the pressure in the artery rises above the pressure in the cuff and then drops back down, resulting in turbulence that produces an audible sound.
The systolic blood pressure is determined using Korotkoff sounds. A blood pressure cuff is pumped high enough to block the flow through the brachial artery. As the cuff's pressure releases, the first sharp tapping sound determines the systolic blood pressure.
The first Korotkoff sound represents a reliable pressure marker of systole of the heart. The timing and quality of the sound indicate the blood pressure.
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As cuff pressure falls, thumping sounds continue
Korotkoff sounds are named after Russian physician Nikolai Korotkov, who discovered them in 1905 while working at the Imperial Medical Academy in St. Petersburg. They refer to the series of sounds heard through a stethoscope over the brachial artery during blood pressure measurement.
The thumping sounds are the result of blood flow dynamics as the cuff pressure fluctuates relative to the arterial pressure. The external pressure from the cuff deforms the underlying arteries, causing jetting of the flowing blood. This instability of the blood vessel wall may be the origin of the Korotkoff sounds, though this is still debated.
Korotkoff sounds are broken down into five phases, heard in sequential order upon deflating the blood pressure cuff. Phase I consists of clear tapping sounds heard for at least two consecutive beats, indicating systolic blood pressure. Phase II involves the softening of these tapping sounds and the addition of a swishing sound. Phase III sees the return of sharper sounds, with Phase IV being a thump that becomes muffled. Finally, Phase V is the diastolic blood pressure, where all sound ceases.
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Sounds change in quality, then become muted
Korotkoff sounds refer to the series of five distinct sounds heard through a stethoscope over the brachial artery during blood pressure measurement. They are named after Nikolai Korotkov, a Russian physician who discovered them in 1905.
When taking a blood pressure reading, a cuff is placed around the upper arm and inflated to a pressure above the systolic pressure. At this point, there is no sound audible as the pressure in the cuff is high enough to completely occlude the blood flow. As the pressure in the cuff is lowered, the first Korotkoff sound is heard. This is because the pressure in the cuff is now equal to the pressure produced by the heart, allowing some blood to pass through the upper arm in spurts. This results in turbulence that produces an audible sound.
As the pressure in the cuff continues to be lowered, thumping sounds continue to be heard as long as the pressure is between the systolic and diastolic pressures. The arterial pressure keeps rising above and dropping back below the pressure in the cuff, resulting in a series of thumping sounds.
Eventually, as the pressure in the cuff drops further, the sounds change in quality and become muted. This is because the cuff no longer provides any restriction to blood flow, allowing it to become smooth again with no turbulence and thus producing no further audible sound. This marks the end of the Korotkoff sounds, and the diastolic blood pressure is determined when all sound ceases.
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All sound ceases at Phase 5, indicating diastolic pressure
Korotkoff sounds are the sounds that medical personnel listen for when taking blood pressure using a non-invasive procedure. They are named after Nikolai Korotkov, a Russian physician who discovered them in 1905.
Korotkoff sounds are broken down into five phases, heard in sequential order upon deflating the blood pressure cuff. Phase 1 is a sharp tapping sound and indicates the systolic blood pressure. Phase 2 is a swishing sound associated with blood flow. Phase 3 transitions to a softer thump, while Phase 4 is a thump that becomes muffled.
The diastolic blood pressure is, therefore, the moment when Korotkoff sounds disappear. The timing and quality of the sound indicate the blood pressure. It is worth noting that the second and third Korotkoff sounds have no known clinical significance.
In some cases, sounds may disappear altogether for a short time between Phase II and III, which is referred to as the auscultatory gap. In paediatrics, there has been some controversy regarding whether to use the fourth or fifth Korotkoff sound as an indicator of diastolic pressure. Current clinical practice guidelines recommend using the fifth Korotkoff sound, but if this is undetectable, the fourth sound should be used.
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Frequently asked questions
Korotkoff sounds are the sounds that medical personnel listen for when taking blood pressure using a non-invasive procedure. They are named after Nikolai Korotkov, a Russian physician who discovered them in 1905.
Korotkoff sounds are produced by blood flow dynamics as the cuff pressure fluctuates relative to the arterial pressure. When the pressure in the cuff is higher than the patient's systolic blood pressure, the brachial artery is compressed, and the flow becomes turbulent, enabling it to be heard by a stethoscope.
Korotkoff sounds are broken down into five phases, heard in sequential order upon deflating the blood pressure cuff. Phase I is a sharp tapping sound, Phase II is a swishing sound, Phase III transitions to a softer thump, Phase IV is a muffled thump, and Phase V is silence.
