Show upsloping st-segment, Biology

Assignment Help:

Q. Show Upsloping ST-Segment?

There are few subjects in exercise literature that has generated more controversy than the significance of up sloping ST-segments. The up sloping ST-segment is considered to indicate ischaemia if, at 80 msec after the J point, the segment is 1.5 mm below the baseline level of the PQ Junction. Junctional changes with very steep up sloping segments are probably not pathological.

149_Show Upsloping ST-Segment.png

The physiological basis for the observed  ECG abnormalities is complex and may be multifactorial. The magnitude of the stenosis  in an artery, estimated by angiography may not accurately predict the amount of restriction in  flow, especially when spasm may be induced by exercise. There has been general agreement however, that an increased magnitude of ST-segment depression usually denotes an increased degree of ischaemia. Ekelund reported an almost a three fold increase in cardiac events in patients with the so called strongly positive stress test (ST depression of 2 mm or more). Current criteria accept 1.5 mm of depression of 0.08 msec from the J point even if the ST-segment slopes upward.
 
Mason and associates in the study of a relation observed that reducing the depression of the ST-segment to 0.5 mm increased the sensitivity to 84 per cent but decreased the specifity to 57 per cent. They found that the ST-segments alone at maximum exercise correlated best with an increased LV filling pressure in 90 per cent of patients.

1466_Show Upsloping ST-Segment1.png


Related Discussions:- Show upsloping st-segment

Cell theory, Normal 0 false false false EN-IN X-NONE ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Filariasis, Filariasis Filariasis is a chronic infection caused by filarid...

Filariasis Filariasis is a chronic infection caused by filarid worms. Around 10 species of Filaridae family are parasitic to man. Adult worms live in the tissues or body cavities

What is the difference between amnion and chorion, Q. What is the differenc...

Q. What is the difference between amnion and chorion? Amnion is the membrane that covers the embryo and Chorion is the membrane that covers the amnion the allantois and the yol

Chlorine (cl) - micronutrients, Chlorine (Cl) - Micronutrients The rol...

Chlorine (Cl) - Micronutrients The role of Cl - in plant is not clearly understood. Cl - is required in Hill reaction, the water splitting reaction of photosystem II. In the

Successive changes in animal life during hydrosere, Successive Changes in A...

Successive Changes in Animal Life during Hydrosere The successive changes in plant communities in the different seral communities of a hydrosere. The question arises, is ther

Features of the gastrulation, Features of the Gastrulation The signifi...

Features of the Gastrulation The significant features of the gastrulation are: a) Proteins of many new types that were not present in the egg or blastula begin to be synthe

Preparation of tlc plate, i want to extract my compound of interest from tl...

i want to extract my compound of interest from tlc i m finding some enzyme inhbitor from microbial source can you plzz suggest me how to prepare nad get my compound

Which respiratory adaptations or organs do, Q. Which respiratory adaptation...

Q. Which respiratory adaptations or organs do aquatic and terrestrial arthropods respectively present? In crustaceans, typical aquatic beings, there are richly vascularized gil

What is a vesicle, What is a vesicle? A vesicle is a relatively minute ...

What is a vesicle? A vesicle is a relatively minute intracellular, membrane-enclosed sac that keeps or transports substances

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