What is st elevation in leads without q-wave, Biology

Assignment Help:

Q. What is ST Elevation in Leads without Q-Wave?

ST elevation in leads without Q-waves can occur in few very different situations, both of which are fairly uncommon. The first is when patients have a very high grade proximal LAD stenosis or a high graft stenosis of a large right coronary artery. The ischaemia associated with ST depression is subendocardial whereas ischaemia producing ST elevation is transmural, affecting the full thickness of the heart. It follows that full thickness ischaemia is rare during exercise even with high grade proximal stenosis.

The second cause of ST elevation is coronary spasm i.e. so severe that it completely obliterates antegrade flow through epicardial arteries. This has been termed Prinzmetals angina and is most commonly seen at rest, but very occasionally occurs with exercise. It is common for arrhythmias to accompany this process. It appears that patient with angiographically normal coronary arteries and Prinzmetal's syndrome due to spasm usually have no change during exercise. If they have CAD, with or without spasm, ST elevation as well as depression may be seen. Exercise induced ST elevation in a subject with variant angina probably indicates hemodynamically significant coronary atheroma.


Related Discussions:- What is st elevation in leads without q-wave

Can you explain about cardiomyopathies, Q. Can you explain about Cardiomyop...

Q. Can you explain about Cardiomyopathies? Cardiomyopathy is a primary disorder of heart muscle that may cause cardiac dysfunction and is not related to any obvious disease pr

Explain about the component of metalloenzymes, Explain about the Component ...

Explain about the Component of Metalloenzymes? Zinc is unique among the trace elements in that it is a part of enzymes for all six Enzyme Commission classes. As a component of

Define fluid and electrolytes requirements in elderly, Define Fluid and Ele...

Define Fluid and Electrolytes requirements in elderly? Care lo be taken that adequate fluid be given to the elderly. If patient is unable to take the required daily needs, then

Complete blood count, One may find leucocytosis with predominant polymorpho...

One may find leucocytosis with predominant polymorphonuclear cellular response in patients of ARF in presence of acute some throat. Throat Culture When patient presents as AR

Light and distribution, Light and Distribution We have mentioned in the...

Light and Distribution We have mentioned in the beginning that the variation in the amount of light generally affects the global and local distribution of plants and animals. L

Open water zone - lake ecosystem, Open Water Zone - Lake Ecosystem Thi...

Open Water Zone - Lake Ecosystem This extends beyond the littoral zone and is too deep for light to penetrate till the bottom and for rooted plants to grow. This zone is divid

Testing a leaf for statch, State four steps to be followed to test for star...

State four steps to be followed to test for starch in a leaf

Explain the failure of implant, Failure of implant The implant is cons...

Failure of implant The implant is considered a failed implant if it presents with even any one of the following features: i) Pain on function (Rule out pain due to soft tis

Why ups is so important to health practitioners, Give a short explanation o...

Give a short explanation of what UPS really means and why it is so important to health practitioners and consumers/patients.

How the visual images are projected, Since the visual images are projected ...

Since the visual images are projected in an inverted manner on the retina why don't we see things upside down? As the crystalline lens is a convex spherical lens it forms inver

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