Multiple nosocomial infections: a risk of modern intensive care.

Many components of modern medical care greatly predispose subjects to nosocomial infection. These include cancer chemotherapy, organ transplantation, immunosuppression, and intensive supportive care, particularly in conjunction with mechanical ventilatory support, invasive monitoring devices and prolonged central or peripheral intravenous therapy. The hazard of nosocomial infection associated with residence in a modern intensive care unit is dramatized by the case history of a near-drowning victim whose hospital course was complicated by an unusually large number and variety of nosocomial bacterial infections. Sixteen different bacterial organisms were isolated from cultures of blood, purulent thoracostomy tube drainage, or purulent tracheal secretions during the patient's prolonged hospital course. Factors which predisposed this patient to nosocomial infections included prolonged positive pressure mechanical ventilation, long-term broad spectrum antibiotics, indwelling arterial and central venous lines, violation of anatomic barriers by foreign bodies such as multiple thoracostomy tubes, and residence in an intensive care unit. This patient's case demonstrates that effective means to prevent nosocomial colonization and infection are urgently needed.