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Fourth heart sound

Index Fourth heart sound

The fourth heart sound or S4 is an extra heart sound that occurs during late diastole, immediately before the normal two "lub-dub" heart sounds (S1 and S2). [1]

10 relations: Exhalation, Gallop rhythm, Heart rate, Heart sounds, Inhalation, Sternum, Systole, Tachycardia, Tennessee, Third heart sound.

Exhalation

Exhalation (or expiration) is the flow of the breath out of an organism.

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Gallop rhythm

A gallop rhythm refers to a (usually abnormal) rhythm of the heart on auscultation.

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Heart rate

Heart rate is the speed of the heartbeat measured by the number of contractions of the heart per minute (bpm).

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Heart sounds

Heart sounds are the noises generated by the beating heart and the resultant flow of blood through it.

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Inhalation

Inhalation (also known as inspiration) happens when oxygen from the air enters the lungs.

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Sternum

The sternum or breastbone is a long flat bone located in the center of the chest.

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Systole

The systole is that part of the cardiac cycle during which some chambers of the heart muscle contract after refilling with blood.

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Tachycardia

Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate.

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Tennessee

Tennessee (translit) is a state located in the southeastern region of the United States.

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Third heart sound

The third heart sound or S3 is a rare extra heart sound that occurs soon after the normal two "lub-dub" heart sounds (S1 and S2).

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Redirects here:

4th heart sound, S4 sound.

References

[1] https://en.wikipedia.org/wiki/Fourth_heart_sound

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