Explain what is third heart sound s3, Biology

Assignment Help:

Explain what is Third Heart Sound S3 ?

S, is generated during the rapid filling pliase. It is a low frequency event. Mechanism of S, production: It is due to a sudden limitation of the rapidly expanding ventricle at the end of early rapid filling pliase. The continued rapid increase in blood volume in ventricle acts as a sudden distending force that causes the sound.

Physiological S2 is rarely heart in normal subjects after 30 years age. Exaggerated flow across the mitral valve as in left to right shunts (VSD, PDA) or MR can cause physiological S2. However, exaggerated flow across the tricuspid valve doesn't usually cause a RV S2. This is because RV is more compliant than LV and hence expands easily to accommodate increased blood flow, Pathological S, is associated with high LA pressure and reduced LV compliance, most commonly in cardiomyopathies. RV S3 can be heard in patients with high RA pressures and RV dilatation secondary to severe TR due to pulmonary hypertension or sudden RV out flow obstruction as in massive pulmonary embolism. S3, is best heard at apex unless RVS, which is best heard in left parasternal area or early loud.S3 due to constrictive pericarditis (Pericardial Knock), which is best, heard in left parasternal area.

 


Related Discussions:- Explain what is third heart sound s3

Structure into which follicle is transformed after ovulation, Q. What is th...

Q. What is the structure into which the follicle is transformed after ovulation? What is the importance of that structure in the menstrual cycle? The follicle that released the

Relationship of different systems in diabetes mellitus, Describe the relati...

Describe the relationship of different systems in diabetes mellitus Diabetes Mellitus has direct relationship with endocrine system, especially with endocrine part of the panc

Effect of a deletion in the operator of the lactose operon, Compare and con...

Compare and contrast the effect of a deletion in the operator of the lactose operon with one in the operator of the histidine operon.

Why do protease-supplying cells of the stomach, Q Why do protease-supplying...

Q Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the p

Define factors influencing rs content of foods, Define Factors Influencing ...

Define Factors Influencing RS Content of Foods? Different fractions of RS mentioned in Table may be naturally present in some foods or may be generated as a result of industria

Root - plant water relation, Root - Plant Water Relation Root system i...

Root - Plant Water Relation Root system is directly related to the absorption of water and its growth under field conditions is very much influenced by soil. In dry land agric

Explain arteries in comparison to veins, Which of the below statements does...

Which of the below statements does NOT apply to arteries when comparing them to veins: a) Have thick walls b) Carry blood away from heart c) Highly elastic walls d) Ha

What are fossil fuels, Q. What are fossil fuels? The Fossil fuels like ...

Q. What are fossil fuels? The Fossil fuels like coal, oil and gas, form when organic material is preserved from the complete action of decomposers, generally buried deep and un

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd