ANATOMY

Detailed explanation-1: -Heart sounds are created from blood flowing through the heart chambers as the cardiac valves open and close during the cardiac cycle. Vibrations of these structures from the blood flow create audible sounds-the more turbulent the blood flow, the more vibrations that get created.

Detailed explanation-2: -The third and fourth heart sound (S3 and S4) are two abnormal heart sound components which are proved to be indicators of heart failure during diastolic period.

Detailed explanation-3: -In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub. ‘ The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the heart function. S1 and S2 are high-pitched and S3 and S4 are low-pitched sounds.

Detailed explanation-4: -An S3 sound is likely caused by an increased amount of blood within your ventricle. This may be harmless, but it can also indicate underlying heart problems, such as congestive heart failure. An S4 sound is caused by blood being forced into a stiff left ventricle. This is a sign of serious heart disease.