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.
Act of listening for sounds within the heart.
Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine.
Heart sounds caused by vibrations resulting from the flow of blood through the heart. Heart murmurs can be examined by HEART AUSCULTATION, and analyzed by their intensity (6 grades), duration, timing (systolic, diastolic, or continuous), location, transmission, and quality (musical, vibratory, blowing, etc).
A type of non-ionizing radiation in which energy is transmitted through solid, liquid, or gas as compression waves. Sound (acoustic or sonic) radiation with frequencies above the audible range is classified as ultrasonic. Sound radiation below the audible range is classified as infrasonic.
The graphic recording of chest wall movement due to cardiac impulses.
The hollow, muscular organ that maintains the circulation of the blood.
Instruments intended to detect and study sound produced by the heart, lungs, or other parts of the body. (from UMDNS, 1999)
Ability to determine the specific location of a sound source.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
Motion pictures of the passage of contrast medium through blood vessels.
Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.
A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.
Pathological conditions involving the HEART including its structural and functional abnormalities.
The graphic registration of the frequency and intensity of sounds, such as speech, infant crying, and animal vocalizations.
The valve between the left atrium and left ventricle of the heart.
Act of listening for sounds within the body.
Books in the field of medicine intended primarily for consultation.
Noises, normal and abnormal, heard on auscultation over any part of the RESPIRATORY TRACT.