Perfusion

Lot. Perfusion – perfusion. The release of a physiological solution, blood, its substitutes or other fluids into an organ, body part, or the entire body. The volume of flowing blood per unit of time is proportional to the perfusion pressure P and inversely proportional to the resistance R:

Q = P / R.

Perfusion pressure P – the pressure difference between certain blood vessels or parts of the vascular system. The resistance to blood flow is greatest in arterioles. In this part of the circulatory system, pressure quickly decreases because Q is equal in all parts of the vascular system. In physical terms, the relationship between Q and P, vascular radius r, fluid viscosity h, and vessel length L is more accurately described by Poiseuille’s law. It shows that the vascular radius r has the greatest influence on the volume of flowing blood.

Source | Glossary of Most Commonly Used Biomedical Terms and Concepts | Lithuanian University of Health Sciences | Academician Professor Antanas Praškevičius, Professor Laima Ivanovienė