Full Text

Introduction

Ventilator-associated pneumonia is pneumonia developing in a patient receiving invasive mechanical ventilation, typically after at least 48 hours of endotracheal intubation, and remains a major healthcare-associated infection in the ICU [1,2]. Even though surveillance definitions and diagnostic thresholds vary across settings, both the CDC (Centre for Disease Control and prevention) -backed Compendium and the ISID (The International Society for Infectious Diseases) 2024 guidance recognize VAP as clinically important because it is associated with prolonged ventilation, longer ICU and hospital stay, excess antimicrobial use, and higher costs [1,2].

The burden is especially relevant in low- and middle-income countries, where the 2024 ISID guidance notes substantially higher VAP rates than those reported in the United States [2]. In pooled LMIC (Low and middle income countries) data cited by ISID, VAP rates declined over time but remained markedly above NHSN (National Healthcare Safety Network) benchmarks, reinforcing the need for practical prevention strategies that can be sustained in real-world ICUs [2].

For bedside teams, VAP prevention is heavily dependent on nursing reliability because many determinants of microaspiration, secretion clearance, oral hygiene, sedation titration, positioning, feeding safety, and circuit handling are continuously managed by nurses [2,3]. Recent data also suggest that higher compliance with VAP-prevention practices is associated with lower ventilation days, lower length of stay, and lower costs, making nursing adherence central to outcome improvement [3].

Why bundles matter?

Single interventions rarely address the complex pathogenesis of VAP, which involves colonization of the aerodigestive tract, micro aspiration around the endotracheal cuff, biofilm formation on the tube, impaired host defense, and prolonged ventilator exposure [2,3]. Bundles aim to reduce several of these mechanisms simultaneously by packaging a small set of evidence-based practices into a reproducible care process [2].

The ISID 2024 chapter cites a systematic review and meta-analysis by Martinez-Reviejo and colleagues including 36 studies and 116,873 participants, showing that ventilator-care bundles significantly reduced VAP episodes and were also associated with shorter mechanical ventilation duration and reduced hospital length of stay [4]. Another systematic review summarized by ISID found that the most successful bundles were multifaceted, frequently including semi-recumbent positioning, oral hygiene, sedation and weaning protocols, subglottic suction, and cuff pressure control, often with education and compliance monitoring [5].

This matters because implementation quality appears to be as important as bundle content [4,5]. In a 2025 study of nurses’ compliance with VAP guidelines, average adherence decreased during admission and lower compliance was associated with VAP occurrence, longer ventilation, longer stay, and higher cost [6]. The practical lesson is that the bundle must be auditable, teachable, and compatible with workflow.

Principles of a nursing VAP-prevention bundle

A modern nursing bundle should prioritize interventions that improve objective outcomes or consistently lower VAP risk with minimal harm [1,2]. Recent guidance has also refined older practices by discouraging routine oral chlorhexidine and emphasizing toothbrushing, sedation minimization, ventilator liberation, and system-level monitoring [1,2]. Table 1 depicts nursing VAP prevention bundle for critically ill patients.

Table 1: Suggested nursing VAP-prevention bundle for intubated adult ICU patients. 

Core bundle components

1. Positioning and aspiration reduction

Head-of-bed elevation to 30–45 degrees remains one of the most consistently recommended elements across reviews and guidelines [1,2]. Although the quality of evidence for hard outcomes is not high, this practice is simple, low-cost, and linked to reduced aspiration and lower VAP rates, which explains why both guidance documents retain it as a foundational measure [1,2].

Positioning should be understood as a dynamic nursing task rather than a one-time order [2]. The patient may drift into a flatter position after transport, line procedures, imaging, or nursing care, so sustained prevention depends on repeated bedside correction and documentation [2].

2. Oral care without routine chlorhexidine

Oral care remains essential, but its content has changed [1,2]. The 2022 SHEA/IDSA/APIC/CDC-endorsed Compendium and the ISID 2024 chapter both recommend daily oral care with toothbrushing and advise against routine oral chlorhexidine for adult ventilated patients because evidence for VAP reduction is inconsistent and some meta-analyses raise concern about possible excess mortality [1,2].

For nursing practice, this shifts emphasis toward mechanical plaque disruption, suctioning of oral secretions, moisturizing the mucosa, and maintaining a structured oral-care schedule [1,2]. In many ICUs, oral care fails not because it lacks evidence but because staffing pressures convert it into an “as needed” task; standardization is therefore crucial [3].

3. Sedation minimization and ventilator liberation

The strongest prevention strategy is often shortening exposure to the ventilator itself [1,2]. Current adult guidance recommends minimizing sedation, using protocols for targeted light sedation, avoiding benzodiazepine-heavy regimens when possible, and performing daily assessments for readiness to extubate through ventilator-liberation protocols [1].

Nurses are central to this step because sedation targets are operationalized at the bedside through frequent reassessment, titration, delirium-aware care, pain control, and communication with physicians and respiratory therapists [1]. When sedation minimization, spontaneous awakening, spontaneous breathing assessment, and mobility are integrated rather than performed in isolation, they appear synergistic in reducing ventilation duration [1].

4. Early mobility and functional preservation

Early exercise and mobilization are now recognized as more than rehabilitation measures [1,2] .According to the Compendium, early mobilization may shorten mechanical ventilation, reduce ICU stay, improve return to independent function, and may lower VAP rates [1].

Nursing implementation requires safety screening, coordination with lines and devices, and graded progression from passive range-of-motion to sitting, standing, or ambulation as feasible [1]. In resource-constrained ICUs, even low-intensity mobility protocols can be meaningful if performed consistently [2].

5. Circuit handling, suction, and secretion control

Ventilator-circuit care is an area where overhandling may be harmful [1,2]. Current guidance recommends changing the ventilator circuit only when visibly soiled or malfunctioning, not on a routine schedule, because scheduled changes do not improve VAP rates or other outcomes and increase costs [1].

The ISID guidance further highlights prevention of condensate reaching the patient as an important bundle element, particularly in LMIC-oriented programs [2,3]. Closed tracheal suction systems remain an unresolved issue in major guidelines, but meta-analytic data summarized by ISID suggest lower VAP incidence with closed versus open suction systems, so their use may be reasonable where available and affordable [2,3].

6. Subglottic drainage and selected adjuncts

Subglottic secretion drainage is no longer considered essential for every patient, but it remains a valuable additional approach for adults likely to require more than 48–72 hours of ventilation [1]. Meta-analyses cited in the Compendium show lower VAP rates with subglottic drainage, although consistent benefit for mortality or length of stay is less clear [1].

From a nursing perspective, these tubes are effective only when integrated into routine secretion management and when staff understand how and when to aspirate secretions safely [1,2]. Selected patients with persistent aspiration risk may also benefit from post-pyloric feeding if gastric intolerance is present, but this is an adjunct rather than a core nursing-bundle component [1,3]. Figure 1 depicts bedside nursing flow for each ventilated shift.

Figure 1: Bedside nursing workflow for each shift.

Implementation in the ICU

A nursing bundle works best when embedded in a broader multidimensional prevention program rather than used as an isolated checklist [2]. The ISID 2024 guidance describes six reinforcing components: a bundle, education, surveillance, compliance monitoring, internal reporting of rates, and performance feedback [2,3,4].

This systems view is supported by multicenter data from LMICs. ISID reports that multidimensional interventions across 374 ICUs in 35 LMICs were associated with sustained reductions in VAP rates over 39 months, with a reported 66% rate reduction from baseline [2]. In Indian ICUs specifically, the same guidance cites an intervention across 21 adult ICUs in 10 cities that reduced VAP from 17.43 to 10.81 per 1,000 ventilator-days [2,4]. Table 2 shows measures that should be emphasized, considered selectively or avoided in VAP prevention.

Table 2: Measures that should be emphasized, considered selectively, or avoided in adult VAP prevention.  

Barriers and nursing solutions

Poor bundle reliability usually reflects systems problems rather than lack of knowledge alone [2,3]. Staffing shortages, interruptions during procedures, lack of oral-care supplies, poor documentation design, and fragmented nurse-RT-physician communication commonly erode adherence [2,3,5].

Education still matters, however, particularly in under-resourced settings [2]. ISID highlights evidence that healthcare workers’ knowledge of VAP prevention is often suboptimal and that prior ICU training is associated with better understanding and performance, which supports structured orientation, return demonstration, and periodic refresher training for ICU nurses [2,6].

A practical response is to convert the bundle into observable behaviors: head-up verified, oral care done, sedation target achieved, extubation screen completed, mobility attempted, condensate drained safely, and exceptions documented [2,3]. Monthly feedback of compliance and VAP rates to bedside nurses and unit leaders is especially important because feedback loops help sustain change beyond the initial education period [2,3,6]. Figure 2 shows unit- level implementation pathway for VAP prevention bundle.

Figure 2: Unit-level implementation pathway for a VAP nursing bundle.

Discussion

The strongest message from current evidence is that VAP prevention depends less on any single “magic bullet” and more on disciplined execution of a few high-yield bedside behaviors [1,2,7-10]. Head-up positioning, toothbrushing-based oral care, sedation minimization, daily ventilator-liberation assessment, early mobility, aspiration precautions, and circuit stewardship represent the practical core of a nursing bundle because they are feasible, scalable, and supported by contemporary guidance [1,2,4,11,12].

Another important shift is de-implementation of outdated practices [1,2]. Routine chlorhexidine oral care was once widely embedded in VAP bundles, but current adult guidance no longer supports its routine use, illustrating how ICU bundles must evolve with evidence rather than persist as historical rituals [1,2,10].

For academic and quality-improvement programs, the bundle should therefore be framed as a nursing-led safety system with measurable process indicators rather than a static list of interventions [2,3]. This framing is particularly relevant in Indian and other LMIC ICUs, where gains depend not only on choosing the right practices but also on ensuring training, supply continuity, bedside documentation, and audit feedback [3].

Conclusion

A nursing bundle to prevent VAP in intubated ICU patients should center on reliable delivery of head-of-bed elevation, toothbrushing-based oral care, sedation minimization, daily weaning and extubation assessment, aspiration precautions, early mobility, and careful ventilator-circuit handling, with selective addition of subglottic drainage in patients expected to require prolonged ventilation. The best outcomes are achieved when these measures are implemented within a multidimensional program of education, surveillance, compliance monitoring, internal reporting, and feedback. For contemporary ICU practice, the priority is not adding more bundle items, but improving fidelity to the interventions that matter most.

Conflicts of interest

Authors declare no conflicts of interest.