_DaVita (Shandong) Kidney Disease Hospital

Causes of Renal Hypertension (Ⅰ)

Time: 2021-01-07Browse times: times

Hypertension refers to a condition in which the pressure that the blood exerts on the walls of the blood vessels as it travels through the arteries is above normal, mainly characterized by the increase in arterial blood pressure (systolic and/or diastolic pressure). The standard of hypertension is ≥ 140/90 mmHg. Renal hypertension is high blood pressure mainly caused by renal parenchymal lesions and renal artery disease. Almost 100% of patients with renal failure suffer from high blood pressure, and more than 50% still suffer from blood pressure above normal after treatment. Therefore, Renal Hypertension is a challenge.
Why does kidney impairment cause hypertension? This starts with the function of the kidney. The main reasons are as follows:

Ⅰ.Excessive water: As we all know, the main function of the kidney is to excrete excessive water and toxins. If kidney function is poor, urine will decrease. If the water intake exceeds the ability of the kidney to excrete, the water in the blood vessels will be accumulated and cannot be excreted, and then the blood pressure will start to rise. That's why patients with renal failure suffer from high blood pressure before dialysis. The blood pressure may gradually drop after the water is gradually excreted during dialysis. If there is still no restriction on water, the more the water intake is, the higher the blood pressure will be. At the same time the body will try to transfer superfluous water to subcutaneous tissue, pleura cavity, pericardial cavity and so on, causing puffiness. Through the examinations such as B ultrasonic, chest cavity or pericardium effusion can be diagnosed. At this time, there has been a lot of water, so it is necessary to strengthen dialysis to gradually excrete water, and then the blood pressure may gradually come down. Therefore, controlling the weight gain during the dialysis interval is important for blood pressure control.

Ⅱ.Excessive sodium: Every day we take in sodium in our diet, which is mostly in table salt, soy sauce, pickled foods, and so on. If a kidney is normal, the excessive sodium can be excreted by the kidney through the urine. But when kidney function declines, superfluous sodium salt cannot be excreted, causing retention of sodium and water, namely there is much sodium in blood, as well as water in blood vessel, causing blood pressure to increase. Therefore, patients with uremia should eat less salt, which is also very important for blood pressure control.

Ⅲ.Excessive toxins. Another therapeutic effect of hemodialysis is the removal of excessive metabolites, known as toxins. If dialysis is inadequate, toxins will be accumulated in the body, and some toxins can raise blood pressure. Therefore, it is important to evaluate the adequacy of dialysis by regular blood-drawing test. In addition, hemofiltration and hemoperfusion can help remove macromolecular toxins and control blood pressure.

IV.Neurological and hormonal disorders: In addition to the above-mentioned causes, hypertension is also caused by other more complex reasons, such as sympathetic nerve excitement, RARS system activation and so on. In addition, some patients with kidney failure suffer from primary hypertension, diabetes and other diseases before they develop uremia. However, after renal failure, the sympathetic nerve and RARS system in the body are further activated, which aggravates hypertension. As a result, some patients with kidney failure also need to take anti-hypertensive drugs. Drugs such as vasodilation, inhibition of the RARS system, and inhibition of the sympathetic nerve are designed to keep blood pressure within a reasonable range. If the doctor asks you to take these drugs, you should follow the doctor's instructions to take them regularly, keep your blood pressure down steadily, and keep your blood pressure from fluctuating.

Well, I'll explain the harm of hypertension to the body next time.