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

Poisoning, Poisoning: Poisoning  is a common medical emergency  in chi...

Poisoning: Poisoning  is a common medical emergency  in childhood. In children under 5 years of  age essentially all poisoning are accidental. Nearly 75 per  cent  of  all poi

Differences between meiosis and mitosis, Q. Concerning their final products...

Q. Concerning their final products daughter cells and their ploidies what are the differences between meiosis and mitosis? In mitosis one cell for illustration with 2n chromoso

Why meat and poultry are important for human body, Why Meat and Poultry are...

Why Meat and Poultry are important for human body? Meat and poultry are rich sources of proteins of high biological value. They do not contain carbohydrates. All

Define the basic function of keratin in the epidermis, Q. What is the funct...

Q. What is the function of keratin in the epidermis? The epidermis is the outer layer of the skin made of epithelial tissue in the epidermis there are keratin-secreting cells (

Classification of biomaterials, Biomaterial is defined, in the broader sens...

Biomaterial is defined, in the broader sense, as any pharmacologically inert material that is capable of interacting with a living organism without causing adverse reactions either

Define two major aspects of nutrition economics, Define two major aspects o...

Define two major aspects of nutrition economics? There are two major aspects of nutrition economics. These aspects are: 1) Quantities of food commodities and their developme

Reverse osmosis, Ordinary osmosis cannot be used to purify water. If the ap...

Ordinary osmosis cannot be used to purify water. If the applied pressure exceeds osmotic pressure then water starts moving from solution side to pure solvent side. This is reverse

Define male and female ascaris lumbricoides, Define Male and Female Ascaris...

Define Male and Female Ascaris Lumbricoides? Ascaris lumbricoides unlike most free-living nematodes and a large number of parasites of plants and animals are not tiny or micro

Transport in plants, Osmosis and transpiration both play a part in the move...

Osmosis and transpiration both play a part in the movement of water through a plant. Which of these two processes makes the greater contribution to the movement of water up the t

Relapse and recurrence, Relapse of infective endocarditis usually occurs wi...

Relapse of infective endocarditis usually occurs within two months of the discontinuation of antimicrobial therapy. The relapse rate for patients with native-valve endocarditis cau

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