Duration limit of the qrs, Biology

Assignment Help:

Q. Duration limit of the QRS?

The duration of the QRS is usually reduced slightly during exercise. Because catecholamines increase conduction velocity in the Purkinje fibers and through the ventricular muscle. A number for studies show that ischaemia reduces the conduction velocity. The greatest prolongation is found in those with three vessel disease.

Athens Score

Changes in R-waves, S-waves and Q-waves have all shown some usefulness, but each is a weak predictor of CAD. Therefore, Michaelides and colleagues, have proposed an index or score to combine these factors. By combining the amplitude changes of the three waves in the formula mm = (DR - DQ - DS) aVF + (DR - DQ- DS) V5 and using a cutoff of less than 5 mm, they were able to obtain a sensitivity of 75 per cent and a specificity of 73 per cent. This was better than using ST depression alone.


Related Discussions:- Duration limit of the qrs

Lead to protein denaturation, Q. What are some factors that can lead to pro...

Q. What are some factors that can lead to protein denaturation? Protein denaturation can be caused by temperature variation, pH change, changes in the concentration of surround

What are examples of nematodes, What are examples of nematodes? Ascaris...

What are examples of nematodes? Ascaris, hookworm and filaria, all parasites of humans, are instance of nematodes (also called as roundworms).

Pbpk modeling during human drug development, Early human studies are normal...

Early human studies are normally conducted in healthy subjects to assess acute safety and, if applicable, to monitor biochemical and pharmacological responses. These studies also p

Enumerate the failures in adaptation, Enumerate the Failures in adaptation ...

Enumerate the Failures in adaptation Failures in adaptation, such as poor school performance or unsatisfactory peer relationships are usually problems that bring children to th

Explain microbiology of water, Q. Explain microbiology of water? Ans. ...

Q. Explain microbiology of water? Ans. Unlike air, natural waters contain their natural flora, as well as, microorganisms from soil and possibly from animals and se

Explain about mental foramen and nerve, Explain about Mental foramen and ne...

Explain about Mental foramen and nerve Mental foramen is a strategically important landmark during osteotomy procedures. Its location and the possibility that an anterior loop

Classification of living organisms, Classification of Living Organisms ...

Classification of Living Organisms The world of living organisms is extremely diverse. Biologists call these diverse forms 'species'. It is estimated that over fifteen lakh (1

Explain natural history of mitral stenosis, Q. Explain Natural History of M...

Q. Explain Natural History of Mitral Stenosis ? Untreated, mitral stenosis is a serious disease with observed 10-year mortality of 70-80 per cent in sy

Describe the term intellectual property rights, Question 1: Describe th...

Question 1: Describe the term Intellectual Property Rights. Show the difference between Patents, industrial designs, and trademarks. Define the term Intellectual Property

What is continuous full thickness incision, Q. What is continuous full thic...

Q. What is continuous full thickness incision? 2. Continuous full - thickness incisions are indicated for a variety of situations outlined below. This type of incision may be u

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