Heart Sounds

The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of SYSTOLE and is heard as a lubb sound; the second is produced by the closing of the AORTIC VALVE and PULMONARY VALVE and is heard as a dupp sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the HEART ATRIA; and the fourth is produced by atrial contraction and ventricular filling.

Year introduced: 1991(1975)

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Tree Number(s): G09.330.380.510

MeSH Unique ID: D006347

Entry Terms:

• Heart Sound
• Sound, Heart
• Sounds, Heart
• Cardiac Sounds
• Cardiac Sound
• Sound, Cardiac
• Sounds, Cardiac

See Also:

• Heart Auscultation
• Heart Murmurs
• Phonocardiography

All MeSH Categories
Phenomena and Processes Category
Circulatory and Respiratory Physiological Phenomena
Cardiovascular Physiological Phenomena
Hemodynamics
Heart Sounds