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 biosystematics - animal taxonomy, Define Biosystematics - Animal Tax...

Define Biosystematics - Animal Taxonomy Biosystematics is basically synonymous with systematic, though it places more emphasis upon genetic (concerning inheritance) and cytolog

Explain the indirect methods of microbial estimation, Explain the Indirect ...

Explain the Indirect Methods of Microbial Estimation? Indirect methods, i.e., methods other than those counting the microbial cells can also be used for quantitation purpose. T

What is the significance of the epiglottis in human body, What is the signi...

What is the significance of the epiglottis in human body? What happens to the glycogen concentration in the liver cells when the level of adrenaline enhances in the blood strea

Growth at different levels, GROWTH AT DIFFERENT LEVELS - 1.      Molec...

GROWTH AT DIFFERENT LEVELS - 1.      Molecular level - It involves synthesis of new molecules and their aggregation into organellae. 2.      Cellular level - It includes

Define cell plate, Cell plate:  In the plants, a membrane-bound space produ...

Cell plate:  In the plants, a membrane-bound space produced during the process of cytokinesis by the vesicles of the Golgi apparatus. The cell plate fuses with plasma membrane, sep

Importance of forests - fuel wood, Importance of Forests - Fuel Wood T...

Importance of Forests - Fuel Wood The forests are renewable resources which provide us a wide variety of commodities. For man, forests have been a source of recreation and the

Explain the term phytates, Explain the term Phytates? We are familiar w...

Explain the term Phytates? We are familiar with phytates as an inhibitor of mineral absorption (calcium, iron etc.) especially in the vegetarian diets that are cereal-based. Th

Imaging techniques to test stress, Q. Imaging Techniques to test stress? ...

Q. Imaging Techniques to test stress? A screening exam with M-mode and limited Doppler should be performed at the start of the test, but a detailed echo examination is usually

Types of respiratory organs, Types of Respiratory Organs Respiratory o...

Types of Respiratory Organs Respiratory organs may be of the following types: Those that have respiratory surface turned out forming an evagination. These are called gi

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