Effect of phosphate concentration in buffered irrigating solutions on arterial thrombosis.

The concentration of phosphate in buffered saline irrigation solutions was evaluated for its effect upon the incidence of arterial thrombosis. A rabbit thrombosis model of combined intimal abrasion and twisted pedicle in the rabbit central ear artery was used. Higher concentrations of phosphate (20 mM) in normal saline yielded a lower thrombosis rate at 7 days postoperatively (50%) in comparison to 5 mM phosphate (89% thrombosis rate; P < 0.05). A standard phosphate-buffered salt solution (Dulbecco's; 9.5 mM phosphate with potassium, calcium, and magnesium salts) also had a high thrombosis rate (91%). This study demonstrates that subtle variations in the irrigation solution can have profound effects upon arterial thrombosis.