Fourth heart sound: Difference between revisions
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{{Infobox medical condition | |||
| name = Fourth heart sound | |||
| image = [[File:Diagram_of_the_human_heart_(cropped).svg|250px]] | |||
| caption = Diagram of the human heart | |||
| field = [[Cardiology]] | |||
| synonyms = S4 gallop, atrial gallop | |||
| pronunciation = | |||
| symptoms = Low-frequency sound just before the first heart sound (S1) | |||
| complications = May indicate [[heart failure]], [[hypertension]], [[aortic stenosis]], or [[cardiomyopathy]] | |||
| onset = | |||
| duration = | |||
| types = | |||
| causes = Stiff or hypertrophic [[ventricle (heart)|ventricle]] | |||
| risks = [[Hypertension]], [[coronary artery disease]], [[aortic stenosis]] | |||
| diagnosis = [[Auscultation]] | |||
| differential = [[Third heart sound]], [[murmur]] | |||
| prevention = | |||
| treatment = Address underlying condition | |||
| medication = | |||
| prognosis = Depends on underlying cause | |||
| frequency = | |||
| deaths = | |||
}} | |||
'''Fourth heart sound''' or '''S4''' is a [[cardiac]] sound produced by the [[atria]] contracting forcefully in an attempt to overcome an abnormally stiff or hypertrophic [[ventricle]]. This sound is often associated with conditions that limit ventricular filling, such as [[hypertension]], [[coronary artery disease]], and [[cardiomyopathy]]. | '''Fourth heart sound''' or '''S4''' is a [[cardiac]] sound produced by the [[atria]] contracting forcefully in an attempt to overcome an abnormally stiff or hypertrophic [[ventricle]]. This sound is often associated with conditions that limit ventricular filling, such as [[hypertension]], [[coronary artery disease]], and [[cardiomyopathy]]. | ||
== Physiology == | == Physiology == | ||
The fourth heart sound is a low-frequency sound that occurs late in diastole, just before the [[first heart sound]]. It is caused by the atria contracting forcefully in an attempt to overcome an abnormally stiff or hypertrophic ventricle. This results in a rapid deceleration of blood flow into the ventricles, which generates the S4 sound. | The fourth heart sound is a low-frequency sound that occurs late in diastole, just before the [[first heart sound]]. It is caused by the atria contracting forcefully in an attempt to overcome an abnormally stiff or hypertrophic ventricle. This results in a rapid deceleration of blood flow into the ventricles, which generates the S4 sound. | ||
== Clinical significance == | == Clinical significance == | ||
The presence of an S4 is considered pathological in adults. It is often associated with conditions that limit ventricular filling, such as hypertension, coronary artery disease, and cardiomyopathy. However, it can also be heard in elderly patients due to age-related changes in the heart. | The presence of an S4 is considered pathological in adults. It is often associated with conditions that limit ventricular filling, such as hypertension, coronary artery disease, and cardiomyopathy. However, it can also be heard in elderly patients due to age-related changes in the heart. | ||
In children and young adults, an S4 is usually benign and can be heard during periods of increased heart rate, such as during exercise or excitement. | In children and young adults, an S4 is usually benign and can be heard during periods of increased heart rate, such as during exercise or excitement. | ||
== Diagnosis == | == Diagnosis == | ||
The fourth heart sound is typically detected during a [[physical examination]] using a [[stethoscope]]. It is best heard at the apex of the heart with the patient in the left lateral decubitus position. | The fourth heart sound is typically detected during a [[physical examination]] using a [[stethoscope]]. It is best heard at the apex of the heart with the patient in the left lateral decubitus position. | ||
The S4 can be differentiated from other heart sounds by its timing and quality. It occurs late in diastole, just before the first heart sound, and is of lower frequency. | The S4 can be differentiated from other heart sounds by its timing and quality. It occurs late in diastole, just before the first heart sound, and is of lower frequency. | ||
== Treatment == | == Treatment == | ||
Treatment of an S4 involves addressing the underlying condition that is causing the ventricle to become stiff or hypertrophic. This may involve medications to control blood pressure or treat heart disease, or in some cases, surgery may be required. | Treatment of an S4 involves addressing the underlying condition that is causing the ventricle to become stiff or hypertrophic. This may involve medications to control blood pressure or treat heart disease, or in some cases, surgery may be required. | ||
[[Category:Cardiology]] | [[Category:Cardiology]] | ||
[[Category:Medical terminology]] | [[Category:Medical terminology]] | ||
[[Category:Symptoms and signs: Circulatory and respiratory systems]] | [[Category:Symptoms and signs: Circulatory and respiratory systems]] | ||
{{Medicine-stub}} | {{Medicine-stub}} | ||
Latest revision as of 18:38, 6 April 2025
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| Fourth heart sound | |
|---|---|
.svg)
| |
| Synonyms | S4 gallop, atrial gallop |
| Pronounce | N/A |
| Specialty | N/A |
| Symptoms | Low-frequency sound just before the first heart sound (S1) |
| Complications | May indicate heart failure, hypertension, aortic stenosis, or cardiomyopathy |
| Onset | |
| Duration | |
| Types | |
| Causes | Stiff or hypertrophic ventricle |
| Risks | Hypertension, coronary artery disease, aortic stenosis |
| Diagnosis | Auscultation |
| Differential diagnosis | Third heart sound, murmur |
| Prevention | |
| Treatment | Address underlying condition |
| Medication | |
| Prognosis | Depends on underlying cause |
| Frequency | |
| Deaths | |
Fourth heart sound or S4 is a cardiac sound produced by the atria contracting forcefully in an attempt to overcome an abnormally stiff or hypertrophic ventricle. This sound is often associated with conditions that limit ventricular filling, such as hypertension, coronary artery disease, and cardiomyopathy.
Physiology[edit]
The fourth heart sound is a low-frequency sound that occurs late in diastole, just before the first heart sound. It is caused by the atria contracting forcefully in an attempt to overcome an abnormally stiff or hypertrophic ventricle. This results in a rapid deceleration of blood flow into the ventricles, which generates the S4 sound.
Clinical significance[edit]
The presence of an S4 is considered pathological in adults. It is often associated with conditions that limit ventricular filling, such as hypertension, coronary artery disease, and cardiomyopathy. However, it can also be heard in elderly patients due to age-related changes in the heart. In children and young adults, an S4 is usually benign and can be heard during periods of increased heart rate, such as during exercise or excitement.
Diagnosis[edit]
The fourth heart sound is typically detected during a physical examination using a stethoscope. It is best heard at the apex of the heart with the patient in the left lateral decubitus position. The S4 can be differentiated from other heart sounds by its timing and quality. It occurs late in diastole, just before the first heart sound, and is of lower frequency.
Treatment[edit]
Treatment of an S4 involves addressing the underlying condition that is causing the ventricle to become stiff or hypertrophic. This may involve medications to control blood pressure or treat heart disease, or in some cases, surgery may be required.
