Effect of Oral Hygiene and 0.12% Chlorhexidine Gluconate Oral Rinse in Preventing Ventilator-Associated Pneumonia After Cardiovascular Surgery

BACKGROUND: Ventilator-associated pneumonia (VAP) is a nosocomial infection of multifactorial etiology and has a negative influence on cardiovascular surgery (CVS) outcomes. OBJECTIVES: Determine the effect of toothbrushing plus 0.12% chlorhexidine gluconate oral rinse in preventing VAP after CVS. METHODS: In a quasi-experimental study, patients undergoing heart surgery were enrolled in a protocol for controlling dental biofilm by proper oral hygiene (toothbrushing) and oral rinses with 0.12% chlorhexidine gluconate (Group 1), and they were compared with a historical control group (Group 2), which included patients who underwent cardiac surgery between 2009 and 2010 and who received regular oral hygiene care. Seventy-two hours before surgery, a dentist provided instruction and supervised oral hygiene with toothbrushing and chlorhexidine oral rinses to patients in Group 1. RESULTS: Each group comprised 150 patients. A lower incidence of VAP (2.7% [95% CI 0.7-7.81 vs 8.7% [95% CI 4.9-14.7], P = .04) and a shorter hospital stay (9 +/- 3 d [95% CI 8.5-9.5] vs 10 +/- 4 d [95% CI 9.4-10.7], P = .01) were observed in Group 1. No significant differences in all-cause in-hospital death were observed between groups (5.3% vs 4.7%, P > .99). The risk for developing pneumonia after surgery was 3-fold higher in Group 2 (3.9, 95% CI 1.1-14.2). CONCLUSIONS: Oral hygiene and mouth rinses with chlorhexidine under supervision of a dentist proved effective in reducing the incidence of YAP.