Which mechanism explains hyperphosphatemia in acute pancreatitis according to the material?

• A. Increased calcium citrate [non-phosphate] complexation
• B. Inability to excrete phosphate
• C. Massive cellular lysis releasing phosphate
• D. Crush injury releasing phosphate

Answer: (A)

In this material, the mechanism centers on how calcium balance shifts during pancreatic injury. Citrate released during severe pancreatitis binds calcium to form calcium citrate complexes. This chelation lowers the amount of free calcium available to react with phosphate and form calcium phosphate precipitates. When calcium is tied up as calcium citrate, more phosphate stays dissolved in the serum, leading to hyperphosphatemia.

This explains why hyperphosphatemia occurs in this context without needing to invoke impaired renal excretion or massive direct phosphate release from cells. The other ideas—phosphate rising mainly from inability to excrete it, or from widespread cellular lysis or crush injuries—aren’t the mechanism described here, which emphasizes calcium chelation by citrate as the key process.