Duration limit of the qrs, Biology

Assignment Help:

Q. Duration limit of the QRS?

The duration of the QRS is usually reduced slightly during exercise. Because catecholamines increase conduction velocity in the Purkinje fibers and through the ventricular muscle. A number for studies show that ischaemia reduces the conduction velocity. The greatest prolongation is found in those with three vessel disease.

Athens Score

Changes in R-waves, S-waves and Q-waves have all shown some usefulness, but each is a weak predictor of CAD. Therefore, Michaelides and colleagues, have proposed an index or score to combine these factors. By combining the amplitude changes of the three waves in the formula mm = (DR - DQ - DS) aVF + (DR - DQ- DS) V5 and using a cutoff of less than 5 mm, they were able to obtain a sensitivity of 75 per cent and a specificity of 73 per cent. This was better than using ST depression alone.


Related Discussions:- Duration limit of the qrs

Steps for prevention industrial accidents, Steps for Prevention Industrial ...

Steps for Prevention Industrial Accidents These steps are as follow: Substitute a less hazardous equivalent. Remove worker from hazard (e.g. automate the sys

Water pollution, When toxic substances enter lakes, streams, rivers, oceans...

When toxic substances enter lakes, streams, rivers, oceans and other water bodies, they get dissolved or lie suspended in water. This causes pollution of water bodies, which degrad

Indications for gingival curettage - endodontic surgery, Indications for Gi...

Indications for Gingival Curettage - Endodontic Surgery a) Persistent periradicular pathosis following endodontic treatment, b) Periradicular lesion that enlarges after endo

Make a sketch of a petroleum trap, Create a sketch of a petroleum trap. Wri...

Create a sketch of a petroleum trap. Write a history for how it came to the present (sketched) form following the rules of logical deduction.

What do you mean by blackcaps, Q. What do you mean by Blackcaps? Blackc...

Q. What do you mean by Blackcaps? Blackcaps are small songbirds found throughout Europe. A large population of blackcaps inhabits the forests of Germany. These blackcaps have t

Section 3.1, Lack of iron in the photic zone of the ocean restricts the siz...

Lack of iron in the photic zone of the ocean restricts the size of plankton population.Iron is what kind of factor for marine plankton?

Sperm which determines the sex of the offspring, a) In humans, is it the sp...

a) In humans, is it the sperm or the ovum which verifies the sex of the offspring? b) Give a reason for your answer.   (a) The sperm verifies the sex of the off

Enumerate the working of mri scanner, Enumerate the working of MRI scanner ...

Enumerate the working of MRI scanner The MRI scanner can be 'tuned' to detect the very subtle disturbances to the magnetic field induced by the different proportions of oxygen

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