Aztreonam concentrations in human tissues obtained during thoracic and gynecologic surgery

The concentrations of aztreonam in human tissues obtained during surgery were measured after a single 2-g intravenous dose. The average concentration in the skeletal muscle, atrial appendage, lung, sternum, pericardial fluid, endometrium, myometrium, fallopian tube, and ovary varied from 3 to 33 micrograms/g (or microgram/ml). These concentrations significantly exceed the MIC for 90% of strains for most members of the family Enterobacteriaceae.