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

Neurological symptoms and signs, Neurological symptoms and signs occur in 3...

Neurological symptoms and signs occur in 30 to 40 per cent of patients with IE, are more frequent when IE is caused by S. aureus, and are associated with increased mortality rates.

Can diseases be etiological factor for diabetes, Q. Can Diseases be etiolog...

Q. Can Diseases be etiological factor for diabetes? Diseases: In aging, a very important cause of diabetes could be an underlying disease. Diabetes occurs secondary lo some ot

Explain eicosanoids, Explain Eicosanoids Eicosanoids are the  local h...

Explain Eicosanoids Eicosanoids are the  local hormones formed  by  body  tissues during self-healing responses  to  stimuli.  Eicosanoids are  a family  of  compounds  deriv

Nutritional management for lactose intolerance, Q. Nutritional Management f...

Q. Nutritional Management for lactose intolerance? Diagnostic tests are available that can give information about the level and activity of the lactase enzyme. Depending on the

Cow-pox (vaccinia), Epidemiology: This infection, although mostly occurrin...

Epidemiology: This infection, although mostly occurring in cows, sometimes also occurs in buffaloes. Under natural conditions, the infection takes place through inoculation by the

Reproduction, site of fertilistion in human

site of fertilistion in human

Distinguish, distinguish between striated and cardic muscles

distinguish between striated and cardic muscles

What are the technique of operation in cps, What are the Technique of Opera...

What are the Technique of Operation in CPS? Percutaneous balloon valvotomy is the procedure of choice at any age. If this is not feasible, open surgical valvotomy is recommende

Excretory system, What are the excretory organ in protozoa,coelenterates, i...

What are the excretory organ in protozoa,coelenterates, insects,spider,and arthropods

Defition of soap, what SOAP is: Subjective - The data includes informa...

what SOAP is: Subjective - The data includes information obtained from the patient or the patient's family regarding the problem. Objective dat a - the data is gathered  f

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