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

What is community ecology explain their characterstics, What is Community E...

What is Community Ecology explain their characterstics? Community Ecology: In ecological terms, a community consists of an assemblage of all of the populations living and int

Some common air pollutants, The major air pollutants are: (i)     Carbo...

The major air pollutants are: (i)     Carbon monoxide, CO (ii)   Nitrogen oxides, (NO)x (iii) Sulphur oxide, (SO)x (iv) Ground level ozone (O3) (v)   Hydrocarbons (

What is esophagus called, What is the valve that separates the stomach from...

What is the valve that separates the stomach from the esophagus called? What is its function? The valve that separates the stomach from the esophagus is the cardia. It has the

What is strobilization. elaborate., What is Strobilization. Elaborate. ...

What is Strobilization. Elaborate. The process which converts scyphostome into a strobila during the life cycle of schyphozoans, jellyfish. Transverse divisions of strobila pro

How to recognition of congenital heart disease, How to Recognition of Conge...

How to Recognition of Congenital Heart Disease ? The manifestations of CE-ID are different in a neonate, an infant or a child. It is often easy to recognise the presence of CHD

Illustrate the different types of drug receptor interactions, Problem 1: ...

Problem 1: Briefly describe the different types of parenteral routes of drug administration. Definition of parenteral routes of administration. Show different types of

Median sternotomy approach-types of surgery, Median Sternotomy Approach :  ...

Median Sternotomy Approach :  The preferred approach these days is through a median sternotomy. Pericardiectoiny proceeds in the same way as done through left thoracotomy, by

Is a gene a triplet of consecutive dna nucleotides, Is a gene a triplet of ...

Is a gene a triplet of consecutive DNA nucleotides? A gene is not a triplet of DNA nucleotides with their respective nitrogen-containing bases, like AAG or CGT. The nucleotide

Describe aerobic respiration to the pyruvic acid molecules, Q. What happens...

Q. What happens during aerobic respiration to the pyruvic acid molecules made by glycolysis? and What is the sequence of reactions that then follows? The pyruvic acid molecules

What do you mean by maxilla, Q. What do you mean by Maxilla? The maxill...

Q. What do you mean by Maxilla? The maxilla has ample keratinized tissue that covers the entire palate. This tissue is well-attached and more difficult to mobilize. Nevertheles

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