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

Define food behaviour - public nutrition, Define Food Behaviour - Public Nu...

Define Food Behaviour - Public Nutrition? Food is not merely a means to survival but the fuel that drives the human body and the economic engine. What influences what we decide

Death, DE A T H - It is terminal end of the degeneration changes of ...

DE A T H - It is terminal end of the degeneration changes of old age. Death occurs when vescular system & respiratory system stop working. Failure of nervous system ma

Define working of body surface in excretion of zinc in human, Define workin...

Define working of Body surface in excretion of zinc in human? Loss of zinc occurs due to the exfoliation of skin and sweating (0.7 -1.0 mg/day). Another route of zinc loss is h

What are the characteristics of thin gingiva, Characteristics of Thin Gingi...

Characteristics of Thin Gingiva  Highly scalloped soft tissue and bony architecture  Delicate friable soft tissue  Minimal amount of attached gingiva  Thin underlying

Protozoa, what are the disadvantages of protozoa?

what are the disadvantages of protozoa?

Non-consumptive value, This is concerned more with nature's services which ...

This is concerned more with nature's services which also make vital contributions to the welfare of society and to ecological processes without which our planet would be uninhabita

Planning of nursing care - acute glomerulonephritis, Planning of Nursing Ca...

Planning of Nursing Care   Provide supportive and symptomatic treatment.  Provide bed rest.  Encourage diet restriction,  Implementation  of Nursing Care

Type of disease identified chromosomes present in karyotype, Which type of ...

Which type of genetic disease can be identified from the visual analysis of the number of chromosomes present in a karyotype? The counting and the identification of chromosomes

Define some essential facts about the fats, Define some Essential facts abo...

Define some Essential facts about the Fats? 1) Fats are essential in diets to facilitate satiety, high-energy intakes, and absorption of fat-soluble vitamins and provide essent

Why dna ligase is needed to complete the replication, Which of the followin...

Which of the following best defines the reason why DNA ligase is needed to complete the replication of internal chromosomal segments? A. DNA ligase is able to delete the last n

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