Leonard I. Malis and prophylactic antibiotics.

Leonard I. Malis introduced important changes in the antimicrobial regimen for neurosurgical procedures at The Mount Sinai Hospital. Among Dr. Malis' innovations, intraoperative administration of a single dose each of vancomycin and gentamicin or tobramicin and constant irrigation of the surgical site with a bactericidal antibiotic (streptomycin) led to the elimination of primary wound infections during a 20-year period. In a study to locate potential sources of microbial contamination in his operating room, this combination of parenteral antibiotics was justified, because 36% of patients were at risk for exposure to methicillin-resistant Staphylococcus aureus and Gram-negative bacteria. Streptomycin as a topical agent was found to be highly efficacious in preventing intraoperative growth of potential pathogens cultured from the surgical wound and the operating room environment.