Objective

The oral cavity with poor hygiene is a reservoir of a complex community of commensal and pathogenic bacteria. Improved oral hygiene (OH) may reduce the incidence of ventilator-associated pneumonia (VAP); however, research on the efficacy of different OH treatments and their potential synergistic effects has remained inconclusive. The objective of this study was to examine whether in patients on mechanical ventilation, using a toothbrushing (T) in conjunction with chlorhexidine (CHX), as opposed to only CHX, reduced the incidence of VAP.

Method

A random-effect meta-analysis of randomized clinical trials (RCTs), which compare the effect of CHX+T (intervention) with CHX (control) on the risk of VAP, was conducted. The Mantel–Haenszel model was used to determine the mean differences (MD), relative risks (RR), and 95% confidence intervals (CI).

Results

Seven studies with 1424 patients were included. Oral care with CHX+T reduced the incidences of VAP (RR = 0.67; CI = [0.50, 0.88], P = .005) compared to that with CHX alone. The former also reduced the duration of mechanical ventilation (MD = -1.38; CI = [-2.43, -0.33], P = 0.01) and length of stay in the ICU (MD = -1.47; CI = [-2.74, -0.20], P = 0.02), though the risk of ICU mortality did not reduce (RR = 0.87, 95% CI= [0.72, 1.04], P = 0.17).

Conclusions

Toothbrushing along with CHX significantly reduced the risk of VAP. Further well-designed randomized controlled trials with a careful focus on the OH are needed to fully establish the advantage of toothbrushing along with CHX for reducing the risk of VAP.