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Meta-Analysis
. 2016 Oct 25;10(10):CD008367.
doi: 10.1002/14651858.CD008367.pub3.

Oral hygiene care for critically ill patients to prevent ventilator-associated pneumonia

Fang Hua  1 , Huixu Xie, Helen V Worthington, Susan Furness, Qi Zhang, Chunjie Li
Affiliations
Meta-Analysis

Oral hygiene care for critically ill patients to prevent ventilator-associated pneumonia

Fang Hua et al. Cochrane Database Syst Rev. .

Update in

Abstract

Background: Ventilator-associated pneumonia (VAP) is defined as pneumonia developing in people who have received mechanical ventilation for at least 48 hours. VAP is a potentially serious complication in these patients who are already critically ill. Oral hygiene care (OHC), using either a mouthrinse, gel, toothbrush, or combination, together with aspiration of secretions, may reduce the risk of VAP in these patients.

Objectives: To assess the effects of oral hygiene care on incidence of ventilator-associated pneumonia in critically ill patients receiving mechanical ventilation in hospital intensive care units (ICUs).

Search methods: We searched the following electronic databases: Cochrane Oral Health's Trials Register (to 17 December 2015), the Cochrane Central Register of Controlled Trials (CENTRAL) (the Cochrane Library, 2015, Issue 11), MEDLINE Ovid (1946 to 17 December 2015), Embase Ovid (1980 to 17 December 2015), LILACS BIREME Virtual Health Library (1982 to 17 December 2015), CINAHL EBSCO (1937 to 17 December 2016), Chinese Biomedical Literature Database (1978 to 14 January 2013), China National Knowledge Infrastructure (1994 to 14 January 2013), Wan Fang Database (January 1984 to 14 January 2013) and VIP Database (January 2012 to 4 May 2016). We searched ClinicalTrials.gov and the World Health Organization International Clinical Trials Registry Platform for ongoing trials to 17 December 2015. We placed no restrictions on the language or date of publication when searching the electronic databases.

Selection criteria: We included randomised controlled trials (RCTs) evaluating the effects of OHC (mouthrinse, swab, toothbrush or combination) in critically ill patients receiving mechanical ventilation for at least 48 hours.

Data collection and analysis: At least two review authors independently assessed search results, extracted data and assessed risk of bias in included studies. We contacted study authors for additional information. We pooled data from trials with similar interventions and outcomes. We reported risk ratio (RR) for dichotomous outcomes and mean difference (MD) for continuous outcomes, using random-effects models unless there were fewer than four studies.

Main results: We included 38 RCTs (6016 participants). There were four main comparisons: chlorhexidine (CHX) mouthrinse or gel versus placebo/usual care; toothbrushing versus no toothbrushing; powered versus manual toothbrushing; and comparisons of oral care solutions. We assessed the overall risk of bias as low in five trials (13%), high in 26 trials (68%), and unclear in seven trials (18%). We did not consider the risk of bias to be serious when assessing the quality of evidence (GRADE) for VAP incidence, but we downgraded other outcomes for risk of bias.High quality evidence from 18 RCTs (2451 participants, 86% adults) shows that CHX mouthrinse or gel, as part of OHC, reduces the risk of VAP compared to placebo or usual care from 25% to about 19% (RR 0.74, 95% confidence intervals (CI) 0.61 to 0.89, P = 0.002, I2 = 31%). This is equivalent to a number needed to treat for an additional beneficial outcome (NNTB) of 17 (95% CI 10 to 33), which indicates that for every 17 ventilated patients in intensive care receiving OHC including chlorhexidine, one outcome of VAP would be prevented. There is no evidence of a difference between CHX and placebo/usual care for the outcomes of mortality (RR 1.09, 95% CI 0.96 to 1.23, P = 0.18, I2 = 0%, 15 RCTs, 2163 participants, moderate quality evidence), duration of mechanical ventilation (MD -0.09 days, 95% CI -1.73 to 1.55 days, P = 0.91, I2 = 36%, five RCTs, 800 participants, low quality evidence), or duration of intensive care unit (ICU) stay (MD 0.21 days, 95% CI -1.48 to 1.89 days, P = 0.81, I2 = 9%, six RCTs, 833 participants, moderate quality evidence). There is insufficient evidence to determine the effect of CHX on duration of systemic antibiotics, oral health indices, caregivers' preferences or cost. Only two studies reported any adverse effects, and these were mild with similar frequency in CHX and control groups.We are uncertain as to the effects of toothbrushing (± antiseptics) on the outcomes of VAP (RR 0.69, 95% CI 0.44 to 1.09, P = 0.11, I2 = 64%, five RCTs, 889 participants, very low quality evidence) and mortality (RR 0.87, 95% CI 0.70 to 1.09, P = 0.24, I2 = 0%, five RCTs, 889 participants, low quality evidence) compared to OHC without toothbrushing (± antiseptics). There is insufficient evidence to determine whether toothbrushing affects duration of mechanical ventilation, duration of ICU stay, use of systemic antibiotics, oral health indices, adverse effects, caregivers' preferences or cost.Only one trial (78 participants) compared use of a powered toothbrush with a manual toothbrush, providing insufficient evidence to determine the effect on any of the outcomes of this review.Fifteen trials compared various other oral care solutions. There is very weak evidence that povidone iodine mouthrinse is more effective than saline/placebo (RR 0.69, 95% CI 0.50 to 0.95, P = 0.02, I2 = 74%, three studies, 356 participants, high risk of bias), and that saline rinse is more effective than saline swab (RR 0.47, 95% CI 0.37 to 0.62, P < 0.001, I2 = 84%, four studies, 488 participants, high risk of bias) in reducing VAP. Due to variation in comparisons and outcomes among trials, there is insufficient evidence concerning the effects of other oral care solutions.

Authors' conclusions: OHC including chlorhexidine mouthwash or gel reduces the risk of developing ventilator-associated pneumonia in critically ill patients from 25% to about 19%. However, there is no evidence of a difference in the outcomes of mortality, duration of mechanical ventilation or duration of ICU stay. There is no evidence that OHC including both antiseptics and toothbrushing is different from OHC with antiseptics alone, and some weak evidence to suggest that povidone iodine mouthrinse is more effective than saline/placebo, and saline rinse is more effective than saline swab in reducing VAP. There is insufficient evidence to determine whether powered toothbrushing or other oral care solutions are effective in reducing VAP. There is also insufficient evidence to determine whether any of the interventions evaluated in the studies are associated with adverse effects.

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Conflict of interest statement

Fang Hua: none known Huixu Xie: none known Helen V Worthington: none known. Professor Worthington is a Co‐ordinating Editor with Cochrane Oral Health Susan Furness: none known. Mrs Furness is an editor with Cochrane Oral Health Qi Zhang: none known Chunjie Li: none known

Figures

1
1
Study flow diagram
2
2
Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies
3
3
Risk of bias summary graph: review authors' judgements about each risk of bias item for each included study
1.1
1.1. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 1 Incidence of VAP.
1.2
1.2. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 2 Mortality.
1.3
1.3. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 3 Duration of ventilation (days).
1.4
1.4. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 4 Duration of ICU stay (days).
1.5
1.5. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 5 Duration of systemic antibiotic therapy (days).
1.6
1.6. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 6 Plaque index.
1.7
1.7. Analysis
Comparison 1 Chlorhexidine versus placebo/usual care, Outcome 7 Adverse effects.
2.1
2.1. Analysis
Comparison 2 Toothbrushing versus no toothbrushing, Outcome 1 Incidence of VAP.
2.2
2.2. Analysis
Comparison 2 Toothbrushing versus no toothbrushing, Outcome 2 Mortality.
2.3
2.3. Analysis
Comparison 2 Toothbrushing versus no toothbrushing, Outcome 3 Duration of ventilation (days).
2.4
2.4. Analysis
Comparison 2 Toothbrushing versus no toothbrushing, Outcome 4 Duration of ICU stay (days).
2.5
2.5. Analysis
Comparison 2 Toothbrushing versus no toothbrushing, Outcome 5 Plaque score.
3.1
3.1. Analysis
Comparison 3 Powered toothbrush versus manual toothbrush, Outcome 1 Incidence of VAP.
3.2
3.2. Analysis
Comparison 3 Powered toothbrush versus manual toothbrush, Outcome 2 Mortality.
3.3
3.3. Analysis
Comparison 3 Powered toothbrush versus manual toothbrush, Outcome 3 Duration of ventilation (days).
3.4
3.4. Analysis
Comparison 3 Powered toothbrush versus manual toothbrush, Outcome 4 Duration of ICU stay (days).
4.1
4.1. Analysis
Comparison 4 Other oral care solutions, Outcome 1 Incidence of VAP.
4.2
4.2. Analysis
Comparison 4 Other oral care solutions, Outcome 2 Mortality.
4.3
4.3. Analysis
Comparison 4 Other oral care solutions, Outcome 3 Duration of ventilation (days).
4.4
4.4. Analysis
Comparison 4 Other oral care solutions, Outcome 4 Duration of ICU stay (days).
4.5
4.5. Analysis
Comparison 4 Other oral care solutions, Outcome 5 Number of participants treated with systemic antiboitics.
4.6
4.6. Analysis
Comparison 4 Other oral care solutions, Outcome 6 Adverse effects.
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References to other published versions of this review

Shi 2010
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