What is r - wave amplitude, Biology

Assignment Help:

Q. What is R - Wave Amplitude?

The R-wave amplitude in the lateral precordial leads usually decreases more in normal than in abnormal subjects and correlates with left ventricular function. Patients with CAD (severe) are likely to have an increase in the R-wave amplitude with exercise. As exercise progresses and the heart rate increases, R-wave amplitude increases normally until the heart rate is approximately 120 or 130 beats per minute, and then the amplitude begins to decrease. This suggests that for the R-wave to have significance, an increase in amplitude should be at a heart rate greater than 120 bpm. The sensitivity of an R-wave increase is rather poor but the specificity can be good if the patient reaches high heart rates. Stress test responses are difficult to analyze in patients with LBBB. Lee and colleagues reported that R-wave changes in 23 patients with LBBB had a 93 per cent sensitivity, 88 per cent specificity and 93 per cent predictability. A reduction in amplitude helps to predict normal coronary arteries and good left ventricular function in LBBB. Berman and associates used the sum of the R-waves in aVL, aVF and V3 and V4, plus S and V1 and V2 and were able to identify CAD in 93 per cent of 230 patients subsequently studied with coronary angiography. An R-wave increase is reported with vasospastic angina and early in the course of a myocardial infarction, where it is predictive of the severity and the likelihood of severe arrhythmias.


Related Discussions:- What is r - wave amplitude

Aves, What is aves?

What is aves?

Biological monitoring to validate that the sterilizer, Q. Biological monito...

Q. Biological monitoring to validate that the sterilizer? The use of biological monitors (spore tests) is the most reliable method to validate that the sterilizer is functionin

Typical form or reparative regeneration - heteromorphosis, Typical Form or ...

Typical Form or Reparative Regeneration - Heteromorphosis Sometimes the part which grows back is not the same as that which was lost. The phenomenon is called Heteromorphosis.

Lyme disease, Lyme disease It is a metazoonoses caused by a spirochaete, B...

Lyme disease It is a metazoonoses caused by a spirochaete, Borrelia burgdorferi. The disease based on the specific symptoms, is also known as erythema migrans (ECM) or lyme  arthr

Compute how much of the absorbance of the bsa, For a sample containing both...

For a sample containing both protein and nucleic acid, the absorbance measured at a particular wavelength will be the sum of contributions from both types of molecule. Using the pr

Method of purchasing a service, Normal 0 false false false ...

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

Explain the physiological effects of ingestion of fibres, Explain the Physi...

Explain the Physiological effects of ingestion of fibres? Physiological effects of ingestion of fibres with adsorption properties are: 1. Diminished absorption of lipids. Wi

Show major complications of hypertension, Q. Show Major complications of hy...

Q. Show Major complications of hypertension? High blood pressure is one of the leading causes of kidney failure, also commonly called end-stage renal disease (ESRD).  Major

State the continuous sutures suturing technique, State the Continuous sutur...

State the Continuous sutures Suturing technique It can be used to attach 2 surgical flap edges or to secure multiple interproximal papillae of one flap independently of the oth

Protozoa, advantages and disadvantages of protozoa

advantages and disadvantages of protozoa

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