Hospital-level risk factors for healthcare-associated infections: insight from the Italian PPS Study

Background

In 2016-2017, a Point Prevalence Survey (PPS) was conducted by the European Centre for Disease Prevention and Control (ECDC) in 29 European countries to investigate healthcare-associated infections (HAIs) and antimicrobial use. The aim of this study was to identify significant determinants of HAIs at a hospital level according to Italian data.

Methods

Among variables considered by the ECDC Protocol for the PPS, those with most plausible relationship with HAI occurrence according to the literature were a priori selected. Hence, conceptual causal models were built for each reference variable, by adjusting for an established set of confounders (geographical region, hospital type and number of beds), and also considering the possible interaction of the number of blood cultures per 100 patient-days (a proxy of how thoroughly HAIs are searched). Direct effects were estimated in the form of risk ratios through multivariable log-binomial regression models.

Results

Data were available for 135 Italian hospitals participating in the survey. Factors with significant impact on HAIs resulted to be: percentage of single rooms (RR = 0.91 for every 5% increase, p = 0.013), presence of a plan for infection prevention and control (IPC, RR = 0.51, p = 0.007), routine production of an IPC report (RR = 0.50, p = 0.001), adoption of measures for HAI prevention (RR = 0.21, p = 0.002) and antimicrobial stewardship (RR = 0.50, p = 0.015). The interaction of the number of blood cultures was significant for the effect of IPC report (p = 0.038), number of measures for HAI prevention (p = 0.037) and antimicrobial stewardship (p = 0.02).

Conclusions

The results confirm the importance of HAI prevention and antimicrobial stewardship as means of lowering the occurrence of HAIs. Therefore, investigating, testing and correctly reporting the onset and evolution of HAIs is paramount to ensure better understanding of the phenomenon and to provide useful insights to create a safer background for clinical practice.

Key messages

Adopting preventive measures and antimicrobial stewardship is crucial in lowering the occurrence of HAIs and ensuring safer care. Investigating, testing and correctly reporting the onset and evolution of HAIs is paramount to ensure better understanding of the phenomenon and to enable effective HAI prevention.

Burden of healthcare-associated infections in Italy: incidence, attributable mortality and disability-adjusted life years (DALYs) from a nationwide study, 2016

BACKGROUND

Healthcare-associated infections (HAIs) are an increasing public health threat. Measuring disease burden in disability-adjusted life-years (DALYs) allows the combination of morbidity and mortality into one figure, as it represents the summation of years lived with disability and years of life lost.

AIM

To evaluate the incidence, attributable deaths and burden of the most significant HAIs in Italy.

METHODS

Prevalence data from the study sample of the 2016 national Point Prevalence Survey of HAIs in acute-care settings were used to estimate the incidence of five HAIs. The methodology from the Burden of Communicable Diseases in Europe (BCoDE)-project was employed for DALY calculations, adapting the disease models to the Italian population.

FINDINGS

We estimated a total of 641,065 (95% uncertainty interval, UI 585,543.00-699,207.90) new yearly cases of HAIs and 29,375 (95% UI 23,705.97-35,905.80) deaths in Italy in 2016. The total annual DALYs were estimated to be 424,657.45 (95% UI 346,240.35-513,357.28), corresponding to 702.53 DALYs (95% UI 575.22-844.66) per 100,000 general population. Bloodstream infections accounted for the majority of total DALYs (59%), healthcare-associated pneumonia for 29%, surgical site infections for 9%, CDI for 2% and urinary tract infections accounted for less than 1% of total DALYs.

CONCLUSION

Results of this study suggest HAIs have a substantial burden in Italy. Reducing the burden of HAIs through infection prevention and control efforts is an achievable goal. This study provides data that could be used to guide policy-makers in the implementation of these measures.

Data quality assessment and subsampling strategies to correct distributional bias in prevalence studies

Background

Healthcare-associated infections (HAIs) represent a major Public Health issue. Hospital-based prevalence studies are a common tool of HAI surveillance, but data quality problems and non-representativeness can undermine their reliability.

Methods

This study proposes three algorithms that, given a convenience sample and variables relevant for the outcome of the study, select a subsample with specific distributional characteristics, boosting either representativeness (Probability and Distance procedures) or risk factors’ balance (Uniformity procedure). A “Quality Score” (QS) was also developed to grade sampled units according to data completeness and reliability.

The methodologies were evaluated through bootstrapping on a convenience sample of 135 hospitals collected during the 2016 Italian Point Prevalence Survey (PPS) on HAIs.

Results

The QS highlighted wide variations in data quality among hospitals (median QS 52.9 points, range 7.98–628, lower meaning better quality), with most problems ascribable to ward and hospital-related data reporting. Both Distance and Probability procedures produced subsamples with lower distributional bias (Log-likelihood score increased from 7.3 to 29 points). The Uniformity procedure increased the homogeneity of the sample characteristics (e.g., − 58.4% in geographical variability).

The procedures selected hospitals with higher data quality, especially the Probability procedure (lower QS in 100% of bootstrap simulations). The Distance procedure produced lower HAI prevalence estimates (6.98% compared to 7.44% in the convenience sample), more in line with the European median.

Conclusions

The QS and the subsampling procedures proposed in this study could represent effective tools to improve the quality of prevalence studies, decreasing the biases that can arise due to non-probabilistic sample collection.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12874-021-01277-y.

Burden of Healthcare-Associated Infections in Italy: Disability-Adjusted Life Years

Background

Healthcare-Associated Infections (HAIs) significantly increase adverse clinical outcomes and healthcare costs. In 2016 Italy participated in the second European Centre for Disease Prevention and Control (ECDC) Point Prevalence Survey (PPS) of HAIs and antimicrobial use in acute care hospitals. The aim of this study was to estimate the burden of the 5 most common HAIs in Italy, by evaluating incidence, attributable deaths, Years of Life Lost (YLL), Years Lived with Disability (YLD) and Disability-Adjusted Life-Years (DALYs).

Methods

National PPS data were used to establish sex- and age-specific incidence of Healthcare-associated Pneumonia (HAP), HA Urinary tract infections (HA UTI), HA Bloodstream Infections (HA BSI) excluding neonatal BSI, Surgical Site Infections (SSI), HA Clostridium Difficile infections (HA CDI). Patients' life expectancy was adjusted according to the severity of underlying conditions using the McCabe score. Following the methodology from the Burden of Communicable Diseases in Europe (BCoDE)-project, an adapted version of the disease models of the BCoDE toolkit was used.

Results

An overall yearly incidence of 643434 new cases of HAI in Italy was estimated. The aggregate burden of the 5 HAIs was 426411.98 DALYs (86731.03 YLD + 339680.96 YLL), corresponding to 702.53 DALYs per 100000 total population. HA BSI and HAP had the highest burden with respectively 253868.22? and 126038.26 DALYs. The population strata with the highest burden were the ones with McCabe Score 1 for every considered HAI. The age groups with the highest burden were 70-74 for male and 45-49 for female patients. In total, 56% of DALYs were attributable to men and 44% to women.

Conclusions

This nation-wide study found a significant burden of disease due to HAIs in Italy. Results of this study could be used to guide policy-makers in the implementation of measures aiming to reduce the impact of HAIs.

Key messages

This study estimated the burden of 5 HAIs in Italy was 426411.98 DALYs (86731.03 YLD + 339680.96 YLL according to 2016 PPS data. Considering the significant burden of HAIs found in this study, infection prevention and control measures should be a Public Health priority in Italy.

Hand hygiene: are WHO Framework scores consistent with hand rub consumption data? A regional study

Background

Hand hygiene represents one of the most effective measures to prevent infection transmission in healthcare facilities and may reduce healthcare-associated infections by up to 15-30%. In Piedmont (a region in North-West Italy), hand hygiene compliance is routinely monitored through the WHO Hand Hygiene Self-Assessment Framework (HHSAF) and each hospital is also required to provide data about alcohol-based hand rub (ABHR) consumption as part of the regional performance indicator surveillance system. The aim of this study is to assess whether these two systems yield consistent results, i.e. whether numerical data matches the self-reported status of hand hygiene compliance.

Methods

For the years 2015-2018, data on ABHR consumption (in millilitres per patient-day, ml/PD) were collected annually at a facility level (40 hospitals) and then aggregated according to the corresponding local health unit/hospital unit, whereas the HHSAF scores were collected at a health/hospital unit level (18 units). The analysis was performed through logistic regression, by taking the WHO HHSAF score (continuous variable) as predictor and ABHR consumption as response variable, dichotomously considered as “low” or “high” (respectively below or above the 20 ml/PD threshold commonly accepted for good practice in hand hygiene).

Results

This study found that a high level of ABHR consumption is more likely to be observed in hospitals/health units with higher HHSAF scores, with a 1.14-fold increase in the odds for every 10-point increase in the HHSAF score. Despite the limited number of observations due to data aggregation, the result reached borderline statistical significance (p = 0.05).

Conclusions

The ABHR consumption surveillance provides feedback heading in the same direction as the results of the HHSAF, therefore the two surveillance systems are consistent. These findings provide further support for the validity of the HHSAF score as a reasonable predictor of hand hygiene compliance.

Key messages

The WHO Hand Hygiene Self-Assessment Framework score is a reliable predictor of hand hygiene compliance, as a high hand rub consumption is more likely to occur in hospitals with higher HHSAF score. Surveillance through the WHO HHSAF should be encouraged, along with alcohol-based hand rub (ABHR) measurement, and these results should be used to guide action plans to promote hand hygiene.

Appropriateness of antibiotics for medical prophylaxis: evaluation of data from the Italian PPS-2

Background

Antibiotics (AB) are administered for medical prophylaxis (MP) to prevent infectious complications. The second national point prevalence survey (PPS) of healthcare-associated infections and AB use was conducted in Italy in 2016-2017. The survey found MP accounted for nearly 25% of all registered ABs, more than twice the EU/EEA proportion. The aim of this study was to evaluate how many ABs were administered for MP and how frequently general indications were followed.

Methods

Data from the PPS were used to evaluate the prevalence of indications for MP over the total number of ABs, the proportion - among these indications - of those justified by a motivation in the patients' charts, and the prevalence of ABs considered appropriate for MP. The evaluation was made in 12 hospitals out of 14 participating in the PPS in Piedmont, chosen on the basis of patient traceability. According to national guidelines, the indications for MP that were considered appropriate in this study were: Trimethoprim/sulfamethoxazole for P. carinii pneumonia, Rifaximin for diverticulitis, Penicillin for Streptococcal infections and for splenectomized patients, and Rifampin for TB infections.

Results

1844 AB prescriptions were registered among 1334 traceable inpatients in Piedmont. The prevalence of indications for MP was 16.2% and 253 ABs (84.6%) were prescribed with a motivation. Only 3% of ABs registered as MP were appropriate for this indication: Bactrim 2%, Rifaximin 0.3%, Penicillin 0.2% and Rifampin 0.4%.

Conclusions

This study found an extremely high rate of inappropriate ABs for MP, that will be further investigated through qualitative analysis of medical records to evaluate whether a misunderstanding of the PPS protocol occurred and empirical therapy was confused with MP. Nevertheless, this study highlighted the need for interventions to improve prescribing appropriateness for MP.

Key messages

This study found that only 2.98% of ABs registered as MP among traceable patients in Piedmont were appropriate for this indication. 15.38% of prescriptions for MP were not justified by a motivation. Interventions to improve prescribing appropriateness for MP could lead to a considerable reduction in inappropriate use of ABs, which is crucial in a country facing hyperendemic levels of AMR.

Knowledge, false myths and beliefs on vaccines among pregnant women: results from NAVIDAD study

Background

The diffusion of false myths and vaccine hesitancy are alarming phenomena in European countries and leads to decreasing trends in infant vaccine coverages. Aim of the study was to analyse the level of confidence and correct awareness about immunization, which are crucial for the success of vaccination programs.

Methods

As part of the NAVIDAD multicentre study, we examined vaccination confidence and complacency, among a sample of 1820 pregnant women from 14 Italian cities. The questionnaire assessed the interviewee’s knowledge, beliefs and misconceptions, as well as their socioeconomic status, sources of information about vaccines and confidence in the Italian National Healthcare Service.

Results

Of the participants, only 9% of women completely believed to efficacy, necessity and safety of vaccinations. Almost 20% of them had misconceptions on the majority of the themes. There was a significant difference in level of knowledge considering educational level: women with a high educational level have less probability to obtain a low knowledge score (OR 0.43 [95%CI 0.34-0.54]). The level of knowledge was influenced also by the sources of information: women who got information from General Practitioner and from Institutional Web sites have significantly less chance to have misconceptions (OR 0.74 [95%CI 0.58-0.96]; OR 0.59 [95%CI 0.46-0.74]). Finally, results underlined the influence of trust in healthcare professional information on likelihood of having misconceptions (OR 0.49 [95%CI 0.27-0.89]).

Conclusions

Data suggest the efficacy of healthcare professionals and Institutional Web sites as source of information to contrast misconceptions and underline the importance of confidence in the healthcare system to increase complacency and confidence on vaccines.

Key messages

There is a general lack of knowledge about vaccinations among future mothers. Most of misconceptions regarding vaccinations are related to their safety: this could affect confidence and complacency. To increase vaccine confidence, there is a strong need to inform future mothers: our data show the importance and efficacy of Health Professionals and Institutional Web sites as information sources.