Tyler Wynn
The lub-dub or lub-dup sounds are the normal heart sounds that are heard through a stethoscope. They are often described as a constant lub-dub, lub-dub. The 'lub' sound is associated with the closure of the atrioventricular valves, while the 'dub' sound is associated with the closure of the semilunar valves. On the other hand, Korotkoff sounds are heard during blood pressure measurement and indicate systolic and diastolic pressures. They are detected using a blood pressure cuff and are caused by turbulent blood flow when the cuff is gradually deflated.
| Characteristics | Values |
|---|---|
| Description | Lub and dupp are often referred to as "heart sounds" |
| Cause | Closure of heart valves during the heartbeat |
| Detection | Heard through a stethoscope |
| Indication | Heart valve activity |
| Number of sounds | Two |
| First sound | Lub, caused by the closure of mitral and tricuspid valves at the start of systole |
| Second sound | Dupp, caused by the closure of aortic and pulmonary valves, marking the end of systole |
| Characteristics | Values |
| --- | --- |
| Description | Korotkoff sounds are noises heard during blood pressure measurement |
| Cause | Turbulent blood flow when the blood pressure cuff is gradually deflated |
| Detection | Detected using a blood pressure cuff |
| Indication | Systolic and diastolic pressures |
| Number of sounds | Two |
| First sound | Indicates systolic blood pressure |
| Second sound | Indicates diastolic blood pressure |
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What You'll Learn
- Korotkoff sounds are heard when systolic pressure exceeds cuff pressure
- Lub and dupp sounds are caused by vibrations inside the ventricles
- Lub is associated with the closure of the atrioventricular valves
- Dupp is associated with the closure of the semilunar valves
- Lub-dupp sounds are used to detect abnormal heart sounds
Korotkoff sounds are heard when systolic pressure exceeds cuff 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. An inflatable pressure cuff is wrapped around the patient's upper arm and inflated to a pressure above the patient's systolic blood pressure. When the pressure in the cuff is dropped to a level equal to that of the patient's systolic blood pressure, the first Korotkoff sound is heard. This is because the pressure in the cuff is high enough to completely occlude blood flow.
As the pressure in the cuff is the same as 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 beyond the cuffed region, resulting in turbulence that produces an audible sound. This sound represents the sudden deceleration of the rapidly opening arterial walls, which causes a snapping or tapping sound.
Korotkoff sounds have five distinct phases. Phase 1 is a sharp tapping sound, which provides the systolic pressure reading. Phase 2 is a swishing or whooshing sound as blood flows through blood vessels while the cuff is deflated. Phase 3 is a thump that is softer than Phase 1, as blood flows through the artery but the cuff pressure is still inflated enough to occlude flow during diastole. Phase 4 is a softer, blowing, muffled sound that fades as the cuff pressure is released. Phase 5 is silence, which occurs when the cuff pressure is released enough to allow normal blood flow.
Lub and dup (or dub) sounds, on the other hand, are heart sounds that represent the closure of different heart valves. The ''lub' is associated with the closure of the atrioventricular valves, while the 'dup' or 'dub' is associated with the closure of the semilunar valves. These sounds are heard through a stethoscope and indicate heart valve activity. They are distinct from the Korotkoff sounds, which are heard when systolic pressure exceeds cuff pressure and are detected using a blood pressure cuff.
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Lub and dupp sounds are caused by vibrations inside the ventricles
The human heart typically makes two primary sounds: "lub" and "dupp" (also spelt "dub"). These sounds are often described as a constant "lub-dub, lub-dub" and are heard in sequence with each heartbeat. Lub and dupp sounds are caused by vibrations inside the ventricles, specifically vibrations from blood surging against heart valves. The heart pumps once for each two sounds.
The first heart sound, or S1, forms the "lub" of "lub-dub". It is composed of two components: M1 (mitral valve closure) and T1 (tricuspid valve closure). The mitral and tricuspid valves are also known as the atrioventricular valves, which separate the left and right atria from the ventricles, respectively. The mitral valve closes slightly before the tricuspid valve, making it the louder component of S1. The closure of the atrioventricular valves occurs at the beginning of ventricular contraction, or systole, when the ventricles start to contract.
The second heart sound, or S2, forms the "dupp" of "lub-dupp". It is composed of two components: A2 (aortic valve closure) and P2 (pulmonary valve closure). The aortic and pulmonary valves are also known as the semilunar valves, which separate the ventricles from the great arteries. The aortic valve separates the left ventricle from the aorta, while the pulmonary valve separates the right ventricle from the pulmonary artery. The closure of the semilunar valves occurs at the end of systole and the beginning of ventricular diastole, when the left ventricle empties and its pressure falls below the pressure in the aorta.
Lub and dupp sounds are typically heard through a stethoscope and indicate normal heart valve activity. However, if there is an abnormal sound, it may indicate turbulence and is called a heart murmur. While some heart murmurs are benign, others may indicate a more serious heart problem, such as a damaged or overworked heart valve, a hole in the heart's wall, or a narrowing in one of the heart's vessels.
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Lub is associated with the closure of the atrioventricular valves
The "lub" sound is associated with the closure of the atrioventricular valves, which include the tricuspid and bicuspid valves. These valves are also referred to as the mitral and tricuspid valves. The "lub" sound is the first heart sound, commonly denoted as S1. It occurs at the beginning of ventricular systole or ventricular contraction, when the heart muscle contracts and blood is pumped out of the ventricles. During this phase, the pressure in the ventricles rises, forcing the atrioventricular valves to close and producing the "lub" sound.
The atrioventricular valves play a crucial role in directing blood flow through the heart's chambers. They ensure that blood flows from the atria to the ventricles and prevent backflow from the ventricles to the atria. By preventing backflow, these valves ensure that blood moves forward to the lungs and the rest of the body. The tricuspid valve is located between the right atrium and right ventricle, while the mitral (or bicuspid) valve is located between the left atrium and left ventricle.
During the cardiac cycle, both the atria and ventricles are initially relaxed (diastole), and blood flows unimpeded from the atria into the ventricles through the open atrioventricular valves. As the atrial muscles contract, pressure rises within the atria, and blood is pumped into the ventricles. When ventricular pressure rises above the pressure in the atria, blood flows toward the atria, producing the "lub" sound as the atrioventricular valves close.
The "lub-dub" sounds are normal heart sounds that come in pairs and can be heard through a stethoscope. They indicate the closure of different heart valves during the heartbeat. If there is an abnormal sound, it may be a heart murmur, indicating turbulence or a more serious heart problem. Heart murmurs can be caused by blood flowing through a damaged or overworked heart valve, a hole in the heart's wall, or a narrowing in one of the heart's vessels.
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Dupp is associated with the closure of the semilunar valves
The 'lub-dub' or 'lub-dup' sounds heard during a heartbeat are referred to as heart sounds. They are caused by the closure of different heart valves. The 'lub' sound is associated with the closure of the atrioventricular valves, while the 'dub' or 'dup' sound is associated with the closure of the semilunar valves.
The semilunar valves are made up of connective tissue and a thin smooth membrane called the endocardium. They work in tandem with the atrioventricular valves, which are located between the atrium and the ventricle. The closure of the semilunar valves is associated with the second heart sound, which marks the end of systole.
The aortic and pulmonary semilunar valves close soon after the mitral and tricuspid atrioventricular valves close. The closure of the semilunar valves is important to prevent blood from flowing back into the ventricles. Incomplete closure of these valves can result in regurgitation, where blood flows back into the ventricles. This can be caused by rheumatic fever, inflammation, stenosis, or congenital heart disease.
The heart sounds are often described as a constant "lub-dub, lub-dub" rhythm. By listening to these sounds through a stethoscope, a doctor can detect abnormal sounds or turbulence, known as heart murmurs. While some heart murmurs are harmless, others can indicate a more serious heart problem, such as blood flowing through a damaged or overworked heart valve, a hole in the heart's wall, or narrowing of a heart vessel.
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Lub-dupp sounds are used to detect abnormal heart sounds
The "lub-dupp" sound is a normal heart sound that comes in pairs. The first "lub" sound is associated with the closure of the mitral and tricuspid valves at the start of systole. The second "dupp" sound is caused by the closure of the aortic and pulmonary valves, marking the end of systole. These sounds are often described as a constant "lub-dupp, lub-dupp".
Innocent heart murmurs are common in children and do not require treatment or lifestyle changes. They are not a sign of heart disease and usually do not cause any other symptoms. On the other hand, abnormal heart murmurs may indicate that blood is flowing through a damaged or overworked heart valve, there may be a hole in one of the heart's walls, or there is a narrowing in one of the heart's vessels.
In addition to the normal lub-dupp sounds and heart murmurs, there are also extra heart sounds that form gallop rhythms. These are heard in both normal and abnormal situations. The third heart sound, or S3, is rarely heard and is considered benign in youth, some trained athletes, and during pregnancy. However, if it reappears later in life, it may signal cardiac problems such as a failing left ventricle or dilated congestive heart failure (CHF).
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Frequently asked questions
Lub and dub (dup) sounds, often referred to as "heart sounds", are the noises generated by the closing of the heart valves during a heartbeat. The lub sound is associated with the closure of the atrioventricular valves, while the dub sound is associated with the closure of the semilunar valves.
Korotkoff sounds are noises heard during a blood pressure measurement, indicating systolic and diastolic pressures. They are detected using a blood pressure cuff and are caused by turbulent blood flow when the cuff is gradually deflated.
Lub-dub sounds are heart sounds that represent the closure of different heart valves and are heard through a stethoscope. On the other hand, Korotkoff sounds are associated with blood pressure measurement and are detected using a blood pressure cuff. While lub-dub sounds indicate heart valve activity, Korotkoff sounds indicate systolic and diastolic pressures.
