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Ann Thorac Surg 1987;43:298-302
© 1987 The Society of Thoracic Surgeons

Articles

Experimental Aerobic-Anaerobic Thoracic Empyema in the Guinea Pig

Constantine Mavroudis, M.D.*, Brian L. Ganzel, M.D., Sara K. Cox, B.S., Hiram C. Polk, Jr., M.D.

From the Division of Thoracic and Cardiovascular Surgery and the Price Institute of Surgical Research, the Department of Surgery, University of Louisville, Louisville, KY

Accepted for publication May 9, 1986.

* Address reprint requests to Dr. Mavroudis, Department of Surgery, University of Louisville School of Medicine, Louisville, KY 40292

The clinical and pathological features of experimental aerobic-anaerobic thoracic empyema in the Duncan-Harley guinea pig are described. Thoracic empyema development and early death (< 14 days after bacterial inoculation) were noted after various concentrations and species were inoculated into the pleural space with a piece of umbilical tape, which was used as a cofactor. The effect of concomitant hemothorax was also tested. Gram-negative infection was found to have a more virulent course than Gram-positive infection in the thoracic cavity. Moreover, these findings support the thesis that intrathoracic inoculation of anaerobic bacteria, even in combination with other anaerobic species, fails to produce clinical empyemas. However, anaerobic bacteria appear to enhance synergistically the virulence of sublethal and sub-empyema-forming concentrations of aerobic bacteria such as Staphylococcus aureus and Escherichia coli.




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