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

Concept of nursing unit, CONCEPT OF NURSING UNIT: Concept in the desig...

CONCEPT OF NURSING UNIT: Concept in the design and facilities of nursing unit has been changed time to time based on the different categories of patients and peculiarities of

Pericarditis , Pericarditis Pericarditis is a syndrome caused by infl...

Pericarditis Pericarditis is a syndrome caused by inflammation of the pericardium. Causes i) Infections Bacterial : Pneumococci, Staphylococci, Streptococci,

Explain the disadvantage of contact plate method, Explain the Disadvantage ...

Explain the Disadvantage of Contact Plate Method? These plates are suitable for sampling the surfaces having low contamination, like pre-cleaned and sanitized surfaces. This is

Computed radiography, C omp ut e d radiography: The d...

C omp ut e d radiography: The development of intensifying screen has greatly improved the efficiency of exposure  and has reduced the exposure time.   The fir

Determine how to calculate the amount of nitrogen, Determine How to Calcula...

Determine How to Calculate the Amount of Nitrogen? The amount of nitrogen can be calculated for this value using the equation: 1000 ml of 1N H 2 SO 4 = 1000 ml of 1N NH 3

Principles of doppler echocardiography, Doppler echocardiogaphy is based on...

Doppler echocardiogaphy is based on  the Doppler effect, which was  described by  the Austrian phy$icist Christian Doppler in  1842. The Doppler effect states that sound frequency

Name the large intestine under which there is appendix, Name the sac-like, ...

Name the sac-like, blind pouch of large intestine, situated below the level of junction of the small intestine into the side of large intestine. At the lower portion of this pouch

Organic compounds, ORGANIC COMPOUNDS - They are substances having bo...

ORGANIC COMPOUNDS - They are substances having both carbon and hydrogen which are commonly biological in origin. Organic compounds can be micromolecules or macromolecules

Describe the formation of egg cells from germ cells, Q. Indicating the name...

Q. Indicating the name and respective ploidy of each involved cell how can the formation of egg cells from germ cells be described? The formation of egg cells begins with a ger

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