Coronary flow limiting stenoses, Biology

Assignment Help:

Coronary Vasoconstriction

1) Coronary flow limiting stenoses are caused by concentric or eccentric artherosclerotic plaques, with or without potential for local vasomotor changes. Fixed flow limiting stenoses present smooth muscle cell atrophy and/or plaque rigidity and are associated with the predictable ischaemic threshold and a stable pattern of effort related myocardial ischaemia.

Dynamic stenoses are usually eccentric, with compliant segments of the wall and preserved muscular media, and are associated with a variable ishaemic threshold.

2) Vasoconstriction at the site of stenoses may result from (1) neural vasoconstrictor stimuli, (2) impairment of vasodilator mechanisms, (3) increased response of dysfunctional vascular smooth muscle cells to vasoconstrictor stimuli, or (4) variable combination of these mechanisms.

3) In animal models, and possibly in unstable patients, the severity of stenosis may also be modulated by platelet aggregates.


Related Discussions:- Coronary flow limiting stenoses

Explain the treatment of lyme disease, Treatment of Lyme Disease Lyme d...

Treatment of Lyme Disease Lyme disease in North America is caused by the spirochete  Borrelia burgdorferi, which is transmitted to humans by Ixodes scapularis or pacificus tick

Functions based on management principles, FUNCTIONS BASED ON MANAGEMENT PRI...

FUNCTIONS BASED ON MANAGEMENT PRINCIPLES: Planning: The objectives of nursing unit should be achieved through planning, good coordination and supervision. While planning nur

Where may bacteria be found, Where may bacteria be found? Expose steril...

Where may bacteria be found? Expose sterile bacteria dishes to as lots of the following conditions as you can. Label the dishes and set them away in a warm, dark place for a so

Mosaic endosperm - variants of endosperm, Mosaic Endosperm - Variants of En...

Mosaic Endosperm - Variants of Endosperm In some plants patches of two different colors appear in the tissues of the endosperm providing a mosaic design. In maize, red and whi

Where letters represent genetic markers and black dot, Two homologous human...

Two homologous human chromosomes have the following structure: where the letters represent genetic markers and the black dot represents the centromere. 1. Diagram the two chromosom

What is the average incubation period of chagas disease, Q. What is the ave...

Q. What is the average incubation period of Chagas' disease? What are some signs and symptoms of the acute phase of Chagas' disease? The Chagas' disease may or may not present

Show the extracellular digestion related to tissue, Q. How is extracellular...

Q. How is extracellular digestion related to tissue and cellular specialization? A variety of specialized tissues and cells appeared with extracellular digestion to provide enz

Define the spatial processes, Define the Spatial processes? Environment...

Define the Spatial processes? Environmental and integrative biology cuts across a wide array of spatial scales, and theoretical approaches that take into account these widely v

Higher calorific value (hcv) or gross calorific value (gcv), It is defined ...

It is defined as the total amount of heat produced, when unit mass/volume of the fuel has been burnt completely and the products have been cooled to room temperature (~ 15 0 C).

Operculum - seed appendages, Operculum - Seed Appendages The term oper...

Operculum - Seed Appendages The term operculum is applied to a plug-like structure formed in the micropylar portion of the seed by proliferation of cells at the tip of the inn

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