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

The reproductive system of house fly, The reproductive system of house fly:...

The reproductive system of house fly: In houseflies seperate male and female organisms are present. Male housefly reproductive system. The male hothe reproductive syste

Hyperthyroidism (graves disease), Hyperthyroidism (Graves Disease): Gr...

Hyperthyroidism (Graves Disease): Graves diseases is  the most common cause of hyperthyroidism  in  children and is usually associated with an  enlarged thyroid gland and exop

Tolerance to cold and freezing temperatures, Normal 0 false f...

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

Neuropsychological assessmnet of older children, Neuropsychological assessm...

Neuropsychological assessmnet of older children In the recent years, the field of child neuropsychology has undergone tremendous growth. There has been a burgeoning interest in

Define reagents estimation of iron in the solution, Define Reagents Estimat...

Define Reagents Estimation of Iron in the Solution? 1. Conc. sulphuric acid (iron free) 2. Conc. potassium permanganate solution 3. Saturated potassium persulphate (K 2 S

What is the critical photoperiod, What is the critical photoperiod? How can...

What is the critical photoperiod? How can the critical photoperiod relate to flowering be experimentally determined? The critical photoperiod is the limit of the photoperiod du

Bro cheese, so bro how do get rid of my bro cheese coz that bro stinks

so bro how do get rid of my bro cheese coz that bro stinks

Origin, What group did reproduction via sexual exchange of genetic informat...

What group did reproduction via sexual exchange of genetic information originate in?

Determine the types of plant sources - natural colourants, Determine the pa...

Determine the parts of plant source The natural food colourants from plant sources are classified into 5 types: a) Anthocyanins, b) Betalaines, c) Carotenoids, d) C

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