Inhibition of the hypotensive effect of plasma protein solutions by C1 esterase inhibitor.

The hypotensive effect of stable plasma protein solution (SPPS) is a well-known phenomenon, causing serious problems in surgical patients and patients supported by cardiopulmonary bypass. Kinins are believed to be responsible. A study was made to prevent this hypotension by adding C1 esterase inhibitor to the SPPS and comparing this with 5% human albumin. The results shows a significant difference between the effects of SPPS and SPPS plus C1 esterase inhibitor infusion on bypass. Five percent human albumin did not cause hypotension. Possible sequelae are discussed.