Why does hemodialysis cause hypotension

Some patients with hemodialysis will appear symptoms of hypotension, after analysis found that: ultrafiltration volume and sodium dialysate sodium ion concentration is too low ultrafiltration volume is too large as the main reason, this group of 170 cases of hypotension, dialysis , Blood from the pump out, that is filled with dialysis and blood pipelines, such as blood pump speed, short time, rapid blood (> 200 ml) into the cardiopulmonary bypass, so that reduced blood circulation, resulting in decreased blood pressure.
Dialysis

Hemodialysis why lead to hypotension? Dialysis process, ultrafiltration too much too fast, when the ultrafiltration rate> capillaries re-filling rate can easily lead to insufficient circulation, resulting in hypotension. Generally occurs after dialysis 3 ~ 4 h. If the sodium ion concentration in the dialysate is lower than the plasma sodium ion concentration, the plasma osmotic pressure is lower than the osmotic pressure of the tissue fluid. Therefore, the liquid enters the tissue from the blood vessel, reduces the blood volume and decreases the blood pressure. Dialysis in the food or dialysate temperature is too high when the dialysate temperature of 37 ~ 38 ℃, can cause blood temperature rise, so that patients with skin, muscle, vascular reflex expansion, effective blood circulation reduction, resulting in lower blood pressure or patients in Dialysis in the gastrointestinal expansion of blood, a large number of blood into the digestive system, so that reduced blood volume, blood pressure.