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

Chromosomes and molecular homology, CHROMOSOME S AND MOLECULAR HOMOLOGY - ...

CHROMOSOME S AND MOLECULAR HOMOLOGY - The DNA content of diploid cells is similar. Hoyer et al in 1965 showed that DNA of humans was 100% similar with chimpanzee and 94%

Direct approach to counseling, Q. Direct Approach to counseling? The di...

Q. Direct Approach to counseling? The direct approach to counselling is also called as the problem-solving approach. The counsellor collects relevant information which aims to

Algal or planktonic fish poisonings, Algal or Planktonic Fish Poisonings: F...

Algal or Planktonic Fish Poisonings: Fish poisoning can result from the ingestion of fish or shellfish that have fed upon algae toxic to human beings. Paralytic shellfish poisoning

Define absorption of dietary iron, Define Absorption of Dietary Iron? H...

Define Absorption of Dietary Iron? Haem iron is more bioavailable than non-haem iron because it is absorbed intact as a soluble complex by endocytosis (process whereby cells ab

Limitations of doppler echocardiograph, Though  it has bees suggested that ...

Though  it has bees suggested that Doppler echocardiography may be useful for non-invasive determinations of  stroke volume and cardiac output, it  should be recognized that th4re

Define the marasmic kwashiorkor, Define the Marasmic Kwashiorkor? In co...

Define the Marasmic Kwashiorkor? In countries where the incidence of protein-calorie malnutrition (PCM) is high, a large number of cases show signs and symptoms of marasmus and

How do malign neoplasias appear, Q. How do malign neoplasias appear? Th...

Q. How do malign neoplasias appear? The Neoplasias appear due to DNA mutations in genes that regulate the cellular proliferation thus making the cell lose its capacity to contr

Define the functions of vitamin e, Define the Functions of Vitamin E? V...

Define the Functions of Vitamin E? Vitamin E is the major lipid-soluble antioxidant in the cell antioxidant defence system and is exclusively obtained from the diet. The main r

Are there aquatic and flying mammals, Q. Are there aquatic and flying mamma...

Q. Are there aquatic and flying mammals? Sirenians (dugongs, manatees) and Cetaceans (whales, dolphins) are aquatic mammals Chiropterans (bats) are flying mammals.

What are the nutritional components of the foods we consume, What are the n...

What are the nutritional components of the foods we consume? The foods that we consume are composed of varying quantities of the following nutritionally important components:

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