Protein binding of salicylate and quinidine in plasma from patients with renal failure, chronic liver disease and chronic respiratory insufficiency.

The plasma protein binding of a representative acidic drug, salicylate, and a representative basic drug, quinidine, has been studied in patients with several diseases that are sometimes associated with uraemia or a change in serum albumin level. Decreased plasma protein binding of salicylate was observed in plasma from patients with uraemia and liver disease. Low albumin levels in these patients could only account inpart for the decreased binding. On the other hand, salicylate binding to plasma proteins appeared to be increased in patients with hypoxia. Decreased plasma protein binding of quinidine was observed in some patients with uraemia and in the majority of patients with liver disease.