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

Into which classes are mollusc divided, Q Into which classes are mollusc di...

Q Into which classes are mollusc divided? What are some representing beings of each class? The phylum Mollusca is divided into five main classes: pelecypods, or bivalves (Pelec

Sperm which determines the sex of the offspring, a) In humans, is it the sp...

a) In humans, is it the sperm or the ovum which verifies the sex of the offspring? b) Give a reason for your answer.   (a) The sperm verifies the sex of the off

Define the cooper''s run (12 minute run) method, Define the Cooper's Run (1...

Define the Cooper's Run (12 minute run) Method? To undertake this test, a 400 metre running track is required-marked every 100 m and a stop watch. The test comprises of noticin

Illustrate glycolysis within the mitochondria, Q. Does glycolysis take plac...

Q. Does glycolysis take place within the mitochondria? Glycolysis happens in the cytosol and not in the mitochondria. Pyruvic acid molecules later enter mitochondria to partici

#title.classification., merits and demerits system of classification by Lin...

merits and demerits system of classification by Linnaeus

Illustrate about the neuropsychological assessment, Illustrate about the ne...

Illustrate about the neuropsychological assessment A neuropsychological assessment is a clinical examination of both the working brain and dysfunctional brain. Neuropsychologic

Describe about the extra-ocular muscles, Describe about the extra-ocular mu...

Describe about the extra-ocular muscles The eye is comprised of extra-ocular and intra-ocular muscles. The extra-ocular muscles are comprised of 4 recti and 2 obliques. The rec

Explain homozygosity and heterozygosity, What is the difference between hom...

What is the difference between homozygosity and heterozygosity? Homozygosity happens when an individual has two identical alleles of a gene, for instance, AA or aa. Heterozygos

Cyclostomes - regeneration in vertebrates, Cyclostomes - Regeneration in Ve...

Cyclostomes - Regeneration in Vertebrates The larvae of the lampreys between the jawless primitive fishes are able to regenerate their amputated tail. Blastema is made at the

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