Descriibe mechanical ventilation and cardiac performance, Biology

Assignment Help:

Descriibe Mechanical Ventilation and Cardiac Performance

During spontaneous breathing, the intrathoracic and intrapulmonary pressures are negative, while with mechanical ventilation, they are positive. This has significant effects on heart function. The positive intrathoracic pressure during mechanical ventilation reduces venous inflow into the right side of the heart by reducing the pressure gradient for filling. In other words, the preload to the heart is reduced. The positive pressure also impacts on the outer surface of the ventricles, reducing diastolic filling. Positive pressure transmitted from the lung through to the pulmonary vessels also increases the afterload to the right ventricle. When the ventricle is failing, positive pressure on its surface might facilitate emptying during systole. This latter effect may be visualized like a hand squeezing the ventricle during systole. Positive pressure ventilation (by NIV or intubation) might improve the function of a failing ventricle by this mechanism.


Related Discussions:- Descriibe mechanical ventilation and cardiac performance

The human population in a malaria ridden area, How does a sickle cell carri...

How does a sickle cell carrier have a benefit over the rest of the human population in a malaria ridden area? Why is organ transplantation from another person generally unsucces

Write in 3-4 lines about the term belief, Q. Write in 3-4 lines about the t...

Q. Write in 3-4 lines about the term belief? Beliefs are learned by us when we were young. These include religious beliefs and beliefs about behaviour. Some beliefs lead to hea

Angiosperm, What is morphological nature of angiosperm

What is morphological nature of angiosperm

Define beriefly about the phytoestrogens, Define beriefly about the Phytoes...

Define beriefly about the Phytoestrogens? You may be aware of the surging interest in phytoestrogens (PE) especially in connection with osteoporosis. This section briefly discu

Zoonoses disease-vaccinia-like disease, Vaccinia-like disease Smallpox caus...

Vaccinia-like disease Smallpox caused by variola virus (VARV) has successfully been eradicated in the last quarter of the 20th century. However, vaccinia like viruses (VLVs) , viz.

Mass extinction, Mas s Extinction - Since beginning many species ev...

Mas s Extinction - Since beginning many species evolved and got extinct (in fact only 1 % is living). Sometimes it occured suddenly at large scale, (most recently dinosa

How can we increase of total peripheral resistance, How can we increase of ...

How can we increase of total peripheral resistance?   A.  A decrease in the diameter of every arteriole.   B.  An increase of sympathetic discharge to all the smooth muscles

Explain about the deuteromycota - fungi, Explain about the Deuteromycota - ...

Explain about the Deuteromycota - Fungi? Deuteromycota - Deuteromycetes or fungi imperfecti reproduce by means of conidia. These have either lost the capacity for sexual reprod

Explain ancient greeks and romans - plant classification, Explain History o...

Explain History of Plant Classification - Ancient Greeks and Romans? Hippocrates, "The Father of Medicine" (460-377 B.C.) is reputed to have been one of Democritus 's disciples

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