Our kidneys regulate waste removal from our blood and serve a role in the endocrine system. When the kidneys are damaged, dialysis is necessary to regularly cleanse the blood. This damage may occur as a result of renal (kidney) cancer, internal injury or kidney disease. Depending on the cause of the kidney failure, patients may need dialysis temporarily or permanently.
The Purpose of Dialysis
Each day, the body filters approximately 1,500 liters of blood. The kidney does that filtering and routes the materials through the urinary tract to the bladder, where it is expelled in our urine. The kidneys ordinarily filter the blood in two ways:
· Diffusion: The kidneys remove toxins and other waste, such as excess minerals
· Ultrafiltration: The kidneys eliminate extra water from the blood.
Without this filtration, toxins build up in the blood, leading to coma and eventually death. Therefore dialysis is necessary any time the kidneys fail to function properly.
Types of Dialysis
There are two main types of dialysis. The appropriate treatment depends on the patient’s condition, medical history and other factors. Studies consistently show that choosing the right dialysis method makes a huge impact on patients’ health.
Hemodialysis
During hemodialysis the blood actually circulates outside the patient’s body. A catheter is inserted into the patient’s vein, siphoning the blood through a machine with a specialized filtration system. The blood then returns to the patient’s body through another catheter. Hemodialysis then, essentially works by giving patients an external, artificial kidney. The process usually takes three to four hours per week.
Prior to beginning hemodialysis, a patient must prepare properly. First, a blood vessel must be enlarged. This step is usually completed surgically. Once hemodialysis treatments begin, they can be completed at a hospital, dialysis center or in the patient’s own home. Home dialysis requires specific training and the absence of certain medical conditions.
Peritoneal Dialysis
The alternative to hemodialysis is peritoneal dialysis. Although the procedure takes longer, peritoneal dialysis gives the patient much more freedom because it can be completed at home, without multiple visits to a clinic. Patients who pursue peritoneal dialysis are generally very motivated to assume responsibility for their own care and maintain more active lifestyles. Patients who continue to travel, attend school or go to work often opt for this treatment method. It is also preferred by patients who get to tired from hemodialysis, such as children or the elderly.
During peritoneal dialysis, a sterile solution that contains glucose and minerals is run through the peritoneal cavity of the abdomen. A membrane in this cavity is semi-permeable, meaning that it lets only certain materials pass through it. The membrane acts as a filter for the blood and the sterile solution absorbs any waste materials. The solution is eventually removed from the body, along with the waste it absorbs.
Effectiveness of Dialysis
Dialysis is not as efficient as the kidneys. Patients generally must take medication and watch their food and liquid intake. Since dialysis does not completely remove waste from the blood, both men and women may experience reduced fertility during dialysis.
The only alternative to dialysis is a kidney transplant. Many patients wait for years before finding an appropriate donor. Therefore, patients should take care of their kidneys and do what they can to reduce their risk for kidney disease:
· Diabetes is thought to cause roughly half of all kidney disease. Eating a proper diet can protect people from developing Type II diabetes.
· Since hypertension (high blood pressure) is linked to approximately 25% of kidney failure cases, patients should monitor their blood pressure, exercise regularly and practice other heart-healthy habits.
· Exposure to chemicals like lead, solvents and fuels has been linked to kidney failure. Adults should try to limit their exposure, especially in industrial settings.
· Certain medications are processed in the kidneys. Overuse of these medications can contribute to kidney failure. Patients should consult their doctors regarding proper dosages for both prescription and over-the-counter medications.
Preventative care and healthy habits help safeguard the whole body, including the kidneys. Dialysis is an effective treatment option, but patients should take care to avoid kidney disease if possible.
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