Abstract: Sepsis is a life-threatening critical illness caused by infection. Serum phosphorus plays an important role in the process of sepsis. Phosphorus is an element component of the body with many biological activities. It participates in the composition of the cell membrane phospholipid bilayer and maintains the normal structure and function of cell membrane. In addition, phosphorus as a component of ATP enzyme is involved in energy storage and transport. It also plays an important role in oxygen delivery, regulation of enzyme activity, and maintenance of acid-base balance in the body. Patients with sepsis often have hypophosphatemia, which is related to multiple organ dysfunction. This paper summarizes the changes of serum phosphorus in sepsis, and provides a new idea for further research and treatment of sepsis.

Key words: sepsis, serum phosphorus, multiple organ dysfunction, critical illness, prognosis

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