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

Explain the properties locust bean gum, Explain the Properties Locust bean ...

Explain the Properties Locust bean gum Locust bean gum is slightly soluble in room temperature water and must be heated to 75 to 85 o C for complete hydration and viscosity dev

Environment and health- impact of air and water pollution, Environment and ...

Environment and Health- Impact of Air and Water Pollution Environment includes a host of factors of which air and water are the two major components. Air pollution is caused b

Bque, what is working of heart

what is working of heart

Public-private dichotomy in providing health services, Normal 0 ...

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

Describe two differences among green algae and red algae, Some biologists p...

Some biologists prefer to categorize brown, red, and some green algae as plants rather than protists. What characteristics of these algae support like classification? Brown and

Explain the nutritional care process, Explain The nutritional care process ...

Explain The nutritional care process The nutritional care process is a systematic and  logical approach to ensure effective and  successful nutrition and intervention. The Ame

Explain changes in gastrointestinal tract of infants, Explain changes in ga...

Explain changes in gastrointestinal tract of infants? A full term baby has the ability to digest simple proteins, carbohydrates and emulsified fats. In first 3-4 months, the p

Carbon paper leaf prints, Carbon paper leaf prints Cover the vein side ...

Carbon paper leaf prints Cover the vein side of a leaf with a very thin layer of lard or vaseline. Place the greased leaf vein side up on various layers of newspaper and cover

Nutrient intake during constipation, Q. What about the fluid and other nutr...

Q. What about the fluid and other nutrient intake during constipation? The fluid intake should be at least 2 litres daily. This includes fluid as foods and beverage besides wa

Define the term - clinical neuropsychology, Clinical Neuropsychology Cl...

Clinical Neuropsychology Clinical neuropsychology is the application of neuropsychological knowledge to the assessment, management and rehabilitation of people who have suffere

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