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

Signal transduction, What is the initial concentration of Beta-adrenergic r...

What is the initial concentration of Beta-adrenergic receptor in blood?

Explain atp molecules in photophosphorylation, Q. How is photic energy abso...

Q. How is photic energy absorbed by chlorophyll transfered to ATP molecules in photophosphorylation and How will be the resulting ATP used? Light excites energizes and chloroph

What do you mean by genera, Q. What do you mean by Genera? Like species...

Q. What do you mean by Genera? Like species the genus represents a concept. Genera (Plural) are aggregates of closely related species. There is no size requirement for a genus.

Are the arteries constituted of more muscle tissue, Q. Are the veins or the...

Q. Are the veins or the arteries constituted of more muscle tissue? How different are the walls of these two kinds of blood vessels? The arterial system has thicker muscle wall

Define advantages of blanching, Define Advantages of Blanching? Blanch...

Define Advantages of Blanching? Blanching as a pre-treatment before drying has the following advantages: 1. It helps in cleaning the material and reducing the amount

Explain the swab method, Explain the Swab Method? Swab method is the ol...

Explain the Swab Method? Swab method is the oldest and widely used method in food and dairy industry and was developed by W.A. Manheimer and T. Ybanez in 1917. A sterile cotton

Define diagnostic criteria for bulimia nervosa, Define Diagnostic Criteria ...

Define Diagnostic Criteria for Bulimia Nervosa? 1. Recurrent episodes of binge eating. An episode of binge eating is characterized by both of the following a) Eating, in a d

What are the elements that form the middle ear, Q. What are the elements th...

Q. What are the elements that form the middle ear? What are the names of the three middle ear ossicles that participate in the phonosensitivity? The middle ear is formed by the

Pulmonary valvotomy with infundibular resection, Pulmonary Valvotomy with I...

Pulmonary Valvotomy with Infundibular Resection :  Infundibular obstruction in cases of pulmonary valvar stenosis could be primary or secondary. 11' this obstruction is signi

Mention causes of implant failure due to restorative problem, Mention cause...

Mention causes of implant failure due to restorative problems. 1) Restorative problems: a) Excessive cantilever. b) Use of implants with rigid prosthetic connection with

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