With the introduction of APD machines into the clinic, there are several dialysis modalities to choose from. The indications for different dialysis modalities are completely different. It is important to note that the etiology of AKI is complex and the condition of patients varies greatly from one another. Therefore, individualized dialysis protocols should be developed for each patient when choosing a dialysis modality. It is important not to copy the treatment model used in PD for patients with chronic renal failure. The following are some of the treatment modalities commonly used to treat AKI. Acute Intermittent Peritoneal Dialysis (AIPD), a mode of dialysis with intensive treatment for a short period of time. 1-2L of dialysis fluid is instilled into the peritoneal cavity at a time, with frequent exchange of dialysis fluid to achieve an abdominal dialysis fluid flow of 2-6L/hour. Each treatment cycle can last up to 16-20 hours. This can be performed 2-3 times per week. Advantages: fast onset of correction of metabolic disorders, especially in the treatment of acidosis and hyperkalemia. Disadvantages: Treatment is intermittent and nitrogen metabolites are not adequately removed. Indications: This type of dialysis is suitable for acute interstitial nephritis (AIN) or acute tubular necrosis (ATN) in combination with a hypermetabolic state. Chronic Equilibrated Peritoneal Dialysis (CEPD), similar to the normal PD mode. Each infusion is 2L of dialysis fluid, with the difference that the fluid stays evenly in the abdominal cavity for about 6 hours. By prolonging the residence time of the PD fluid in the peritoneal cavity in order to increase the removal of medium and large molecules. Indications: This type of dialysis is suitable for patients with relatively stable catabolism and low peritoneal transit. Third, Tidal Peritoneal Dialysis (TPD) Tidal Peritoneal Dialysis (TPD), 2-3 L of dialysis fluid is first instilled into the peritoneal cavity, and then 1-1.5 L is exchanged each time. because fresh dialysis fluid is constantly entering the peritoneal cavity, the solute concentration between dialysis fluid and blood always maintains a certain gradient difference. The TPD model is currently one of the most common means of treating AKI in PD, because the fluid exchange is like a tidal wave throughout the dialysis process. The biggest advantage of TPD is that the initial dialysis dose is larger (3 L), and the fresh dialysis fluid is constantly replenished during the treatment process, so that the gradient difference between the dialysis fluid and blood solute concentration is always large. Since the dialysis fluid has been in contact with the peritoneum throughout the dialysis process, the removal of medium-molecule substances is also of some significance. Clinical studies have shown that the solute removal ability of TPD is significantly higher than that of CEPD; 3, the removal of nitrogen products; if the dose of dialysis fluid is adjusted (increased), the removal effect of nitrogen products can be further improved. Fourth, High Volume Peritoneal Dialysis (HVPD) High Volume Peritoneal Dialysis (HVPD), the dose per dialysis is similar to that of normal PD, except that the dialysis efficacy is improved by increasing the dialysis frequency. Usually 18-35 exchanges are required in 24 hours to bring the total dialysis dose to about 36-70L. Some studies have demonstrated that if treated with a dialysate dose of 35-44L/day, the urea KT/V can reach about 3.85, which is almost the level of urea removal by daily hemodialysis. Indications: This mode of dialysis is often used in patients with AKI who are tall and have severe hypercatabolic abnormalities. Continuous Flow Peritoneal Dialysis (CFPD) is a procedure in which two dialysis tubes are placed in the abdominal cavity, with dialysate entering at one end and exiting at the other. This mode of dialysis is called continuous peritoneal dialysis because the dialysate enters and exits at the same time. Advantages: The most important feature of CFPD is the high flow rate of dialysis fluid, almost 300 ML/min, which can accelerate the removal of urea and other inflammatory mediators. Disadvantages: However, this mode of dialysis requires large amounts of dialysate, and ultrafiltration is not effective and is not suitable for patients with unstable volume status.