Principles of Hemodialysis

Hemodialysis (HD) involves the exposure of blood to a semipermeable membrane (dialyzer) against which a physiologic solution (dialysate) is flowing (Fig. 26—6). The dialyzer is composed of thousands of capillary fibers made up of the semipermeable membrane, which are enclosed in the dialyzer, to increase the surface area of blood exposure to maximize the efficiency of removing substances. The dialysate is composed of purified water and electrolytes, and is run through the dialyzer countercurrent to the blood on the other side of the semipermeable membrane. The process allows for the removal of several substances from the bloodstream, including water, urea, creat-inine, electrolytes, uremic toxins, and drugs. Although the dialysate is not sterilized, the membrane prevents bacteria from entering into the bloodstream. However, if the membrane ruptures during hemodialysis, infection becomes a major concern for the patient.

Table 26-8 Advantages and Disadvantages of Hemodialysis

The Prevention and Treatment of Headaches

The Prevention and Treatment of Headaches

Are Constant Headaches Making Your Life Stressful? Discover Proven Methods For Eliminating Even The Most Powerful Of Headaches, It’s Easier Than You Think… Stop Chronic Migraine Pain and Tension Headaches From Destroying Your Life… Proven steps anyone can take to overcome even the worst chronic head pain…

Get My Free Audio Book


Post a comment