Antibiotics to help reduce mortality and respiratory infections in people receiving intensive care in hospital

Infections acquired in intensive care units (ICUs) are important complications of the treatment of patients with very severe diseases who need ventilation (mechanical breathing support). Some people will die because of these infections. Considerable efforts have been made to evaluate methods for reducing this problem; one of these involves the use of antibiotics administered as preventative intervention, usually referred to as selective decontamination of the digestive tract (SDD). This review includes 36 studies involving 6914 patients treated in ICUs to investigate whether the administration of antibiotics prevents the development of infections. Antibiotics were administered in two different ways. In some studies antibiotics were applied both directly to the oropharynx via a nasogastric tube (topical) and intravenously (systemic). In other studies they were applied only topically. Our results show that when patients received the combination of topical plus systemic antibiotics there were less infections and deaths. When patients received only topical treatment there were less infections but the number of deaths was not changed. Although this treatment seems to work it is not widely used in clinical practice because there is concern about the possible development of antibiotic resistance (that is, bacteria become unresponsive to drugs).