What is atrial extrasystoles, Biology

Assignment Help:

Q. What is Atrial Extrasystoles?

Atrial premature beats often occur at lower workloads and have little significance. As exercise increases, they usually subside and may then return during recovery. Supraventricular extrasystoles however, may be an aid in the identification of ischaemia. When the atrial extrasystolic beat has ST depression greater than the preceding sinus beat, it has been shown to be a marker for ischaemia. Michaelides and associates34 reported a sensitivity of 74 per cent and a specificity of 84 per cent for this little recognized finding. It has also been reported that the R-wave in supraventricular beats in ischaemic patients is taller than that in the normally, conducted beats. In normals, the premature "R"-wave is shorter than in the previous beat. An increased R-wave or no change in premature supraventricular beats has a sensitivity of 79 per cent and a specificity of 90 per cent in those who had exercise induced premature supraventricular contractions. When some baseline ST depression is present and the premature atrial contraction shows less deviation than the sinus beat, then ischaemia is rare. When a nodal premature beat is followed by a long pause and the following sinus beat shows accentuated ST depression, ischaemia is also likely.


Related Discussions:- What is atrial extrasystoles

Explain haccp, HACCP Normal 0 false false false ...

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

Describe about diagnostic approach congenital heart disease, Describe about...

Describe about diagnostic approach for congenital heart disease ? In this section we propose to outline the principles of a diagnostic approach that is applicable to newborns,

Explain fetal development, Explain Fetal Development? The medical profe...

Explain Fetal Development? The medical profession divides pregnancy into three-month stages called trimesters. At the end of the first trimester, the fetus is only about 5 cm l

Disinfectant, General information about disinfectants A disinfectant is...

General information about disinfectants A disinfectant is a chemical that kills disease-causing agents on contact. Natural disinfection agents, such as sunlight, heat, keeping

Acyanotic congenital heart disease, Acyanotic Congenital Heart Disease   ...

Acyanotic Congenital Heart Disease   In this infant has no cyanosis because there is no abnormal communication between pulmonary and systemic circulation or there  is no mixing

Give the introduction of genesis of coronary artery diseases, Give the intr...

Give the introduction of genesis of coronary artery diseases and risk factors? Cardio-vascular diseases have their roots in the structure and functional alterations in the vasc

Foot-rot, Foot-rot Foot-rot is a term applied to the condition of feet ...

Foot-rot Foot-rot is a term applied to the condition of feet of cattle, sheep, goats and sometimes pigs. It is characterized by inflammation, necrosis and ulceration of underly

What is gum ghatti, What is Gum ghatti Gum ghatti, also known as Indian...

What is Gum ghatti Gum ghatti, also known as Indian gum, is amorphous, translucent exudates of the Anogeissus latifolia tree of the Combretaceae  family. Gum Ghatti is composed

Zoology, #question.characteristics of coelenterata?.

#question.characteristics of coelenterata?.

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