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

Define about the nutrition, Define Nutrition, Diet and Cancer? In this,...

Define Nutrition, Diet and Cancer? In this, we will discuss the common forms of cancer, how they develop, relevant etiological factors, pathological/metabolic changes and other

Name the implant failures, Implant failures On the basis of the stage w...

Implant failures On the basis of the stage when problems occurs implant failures can be classified as : i) Before Abutment Connection. ii) During Abutment Connection.

Difference between self pollination and cross pollination, What is differen...

What is difference between self pollination and cross pollination? Which of the two modes of pollination contributes more to the plant diversity? Self pollination take places w

Digestive system - large intestine, LARG E INTESTINE - More wider. Arr...

LARG E INTESTINE - More wider. Arranged around small intestine in the form of ? . It is 1.5 m long. Villi & microvilli absent. It shows 3 parts Ceacum, colon & rectum.

Discuss about dengue and aids, Why is it difficult to produce efficient vac...

Why is it difficult to produce efficient vaccines against a viral infection like dengue and AIDS? It is complex to make vaccines against dengue because there are four dissimila

Explain the soft diet, Explain the soft diet The soft diet provides so...

Explain the soft diet The soft diet provides soft whole food that is lightly seasoned and moderately low in fibre. The foods have a soft  texture and are easy  to digest. Smal

Mitral valve replacement, Mitral Valve Replacement :  When mitral...

Mitral Valve Replacement :  When mitral valve replacement for a calcified, stenotic valve is done, usually it is a classical procedure removing leaflets, their chordae an

Explain diet from lifestyle risk factors, Explain diet from Lifestyle Risk ...

Explain diet from Lifestyle Risk Factors ? The lifestyle factors are the way of living of an individual and comprise of the diet, smoking, alcohol, physical activity and stress

Polyphyletic theory, Please I need short notes on polyphylrtic theory

Please I need short notes on polyphylrtic theory

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