Characteristics associated with clinician diagnosis of aspiration pneumonia: a descriptive study of afflicted patients and their outcomes

Efficacy of an Aspiration Prevention Program That Utilizes the Gugging Swallowing Screen in Older Patients

Purpose

Older patients have a higher risk of aspiration pneumonia and mortality if they are hospitalized. We aimed to assess the effectiveness of an aspiration prevention quality improvement (QI) program that utilizes the Gugging Swallowing Screen (GUSS) in older patients.

Patients and Methods

This retrospective cohort study was conducted in an acute medical care unit of a tertiary hospital in South Korea. The study used one-to-one propensity matching and included 96 patients who received the QI program and 96 who did not. All patients were aged 65 years or older and had risk factors for aspiration, including neurological and non-neurological disorders, neuromuscular disorders, impaired airway defenses, and dysphagia due to esophageal or gastrointestinal disorders. The primary outcomes included the duration of the fasting period during hospitalization, changes in nutritional status before admission and at discharge, in-hospital mortality, and readmission due to pneumonia within 90 days.

Results

Fasting period, changes in weight and albumin levels upon discharge after hospitalization, and length of stay did not differ significantly between patients in the GUSS and non-GUSS groups. However, the risk of readmission within 90 days was significantly lower in patients who underwent the GUSS than in those who did not (hazard ratio, 0.085; 95% confidence interval, 0.025-0.290; p = 0.001).

Conclusion

The GUSS aspiration prevention program effectively prevented readmission due to pneumonia within 90 days in older patients with acute illnesses. This implies that the adoption of efficient aspiration prevention methods in older patients with acute illnesses could play a pivotal role by enhancing patient outcomes and potentially mitigating the healthcare costs linked to readmissions.

Investigating in VigiBase over 6000 cases of pneumonia in clozapine-treated patients in the context of the literature: focus on high lethality and the association with aspiration pneumonia

BACKGROUND

The literature associates clozapine with pneumonia/aspiration pneumonia.

RESEARCH DESIGN AND METHODS

The international pharmacovigilance database (VigiBase™) uses the information component (IC) as statistical signal. VigiBase clozapine reports were analyzed for pneumonia/aspiration pneumonia from introduction to 10 May 2023.

RESULTS

There were 6392 cases of all types of pneumonia (5572 cases of pneumonia, 775 of aspiration pneumonia, and 45 combined). The IC was 3.52 for aspiration pneumonia, introduced as a VigiBase label in 2003, and 1.91 for pneumonia. Patients were reclassified as 3628 with no signs of aspiration and 1533 with signs. Signs of aspiration were strongly associated with some co-medications: olanzapine, odds ratio (OR) = 23.8, 95% confidence interval (CI), 14.9-38.0; risperidone OR = 18.6, CI, 11.4-30.4; valproic acid, OR = 5.5, CI, 4.5-6.6; and benzodiazepines OR = 5.5, CI, 4.5-6.6. In 2415 cases with completed data, fatal outcomes made up 45% (signs of aspiration made no difference), but there was wide variability from 0% (females <45 years of age; duration ≤30 days) to 76% (males >64 years of age; duration >1 year). During the first week, pneumonia was associated with 1) very high titration doses, 2) very small doses in Parkinson's disease, and 3) Japan vs other countries.

CONCLUSIONS

In clozapine-treated patients: 1) at least 30% of pneumonia cases may be aspiration pneumonia, 2) stopping some co-medications may decrease the risk of aspiration pneumonia, 3) average lethality in pneumonia was 45% but may be around 75% in geriatric patients with long-term treatment, and 4) safer titrations may sometimes require 5-mg tablets.

Accuracy of the Infectious Diseases Society of America and British Thoracic Society Criteria for Acute Pneumonia in Differentiating Chemical and Bacterial Complications of Aspiration in Comatose Ventilated Patients Following Drug Poisoning

Drug poisoning frequently leads to admission to intensive care units, often resulting in aspiration, a potentially life-threatening condition if not properly managed. Aspiration can manifest as either bacterial aspiration pneumonia (BAP) or aspiration pneumonitis (AP), which are challenging to distinguish potentially leading to overprescription of antibiotics and the emergence of multidrug-resistant bacteria. This study aims to assess the accuracy of the Infectious Diseases Society of America (IDSA) and British Thoracic Society (BTS) criteria in differentiating BAP from AP in comatose ventilated patients following drug poisoning. This cross-sectional study included 95 patients admitted for drug poisoning at the Lille University Hospital intensive care department, between 2013 and 2017, requiring mechanical ventilation and receiving antibiotics for aspiration. Patients were categorized as having bacterial complications if tracheal sampling yielded positive culture results, and if they were otherwise considered to have chemical complications. The sensitivity, specificity, positive predictive value, and negative predictive value of IDSA and BTS criteria in identifying patients with bacterial complications were evaluated. Among the patients, 34 (36%) experienced BAP. The IDSA criteria demonstrated a sensitivity of 62% and specificity of 33%, while the BTS criteria showed a sensitivity of 50% and specificity of 38%. Both the IDSA and BTS criteria exhibited poor sensitivity and specificity in identifying microbiologically confirmed pneumonia in comatose ventilated patients following drug poisoning.

Investigation of predictors for in-hospital death or long-term hospitalization in community-acquired pneumonia with risk factors for aspiration

Background

It is known that the mortality of pneumonia in patients with risk factors for aspiration is worse than that in those without these risk factors. However, it is still unknown which risk factors for aspiration predict prognosis. Therefore, we aimed to determine which risk factors for aspiration are associated with death or prolonged hospitalization.

Methods

We prospectively followed patients with community-acquired pneumonia at a single hospital providing acute to chronic care in Japan until they died or were discharged. Patients at any risk of aspiration were included. The associations between pneumonia severity, individual risk factors for aspiration, and in-hospital death or prolonged hospitalization were investigated. Overall survival was estimated by the Kaplan - Meier method, and the factors associated with in-hospital death or prolonged hospitalization were investigated by multivariate analysis using factors selected by a stepwise method.

Results

In total, 765 patients with pneumonia and risk factors for aspiration were recruited. One hundred and ten patients deceased, and 259 patients were hospitalized over 27 days. In-hospital death increased as the number of risk factors for aspiration increased. In the multivariate analysis, male, impaired consciousness, acidemia, elevated blood urea nitrogen, and bedridden status before the onset of pneumonia were associated with in-hospital death (odds ratio [OR]: 2.5, 2.5, 3.6, 3.1, and 2.6; 95% confidence interval [CI]: 1.6-4.1, 1.4-4.2, 1.6-8.0, 1.9-5.0, and 1.6-4.2 respectively). In the Cox regression analysis, these factors were also associated with in-hospital death. None of the vital signs at admission were associated. Tachycardia, elevated blood urea nitrogen, hyponatremia, and bedridden status were associated with hospitalization for >27 days (OR: 4.1, 2.3, 4.3, and 2.9; 95% CI: 1.3-12.9, 1.5-3.4, 2.0-9.4, and 2.0-4.0, respectively).

Conclusions

Blood sampling findings and bedridden status are useful for predicting in-hospital mortality and long-term hospitalization in patients with pneumonia and any risk factor for aspiration.

Predictors and impact of aspiration pneumonia in patients undergoing esophagogastroduodenoscopy: national inpatient sample 2016-2020

OBJECTIVES

Aspiration pneumonia is a rare but feared complication among patients undergoing esophagogastroduodenoscopy (EGD). Our study aims to assess the incidence as well as risk factors for aspiration pneumonia in patients undergoing EGD.

METHODS

National Inpatient Sample 2016-2020 was used to identify adult patients undergoing EGD. Patients were stratified into two groups based on the presence of aspiration pneumonia. Multivariate logistic regression analysis was performed to identify the risk factors associated with aspiration pneumonia. We adjusted for patient demographics, Elixhauser comorbidities and hospital characteristics.

RESULTS

Of the 1.8 million patients undergoing EGD, 1.9% of the patients developed aspiration pneumonia. Patients with aspiration pneumonia were mostly males (59.54%), aged >65 years old (66.19%), White (72.2%), had Medicare insurance (70.5%) and were in the lowest income quartile (28.7%). On multivariate analysis, the age >65 group, White race, congestive heart failure (CHF), neurological disorders and chronic obstructive pulmonary disease were associated with higher odds of aspiration pneumonia. This complication was associated with higher in-hospital mortality (9% vs. 0.8%; P  < 0.001) and longer length of stay (10.54 days vs. 4.85 days; P  < 0.001).

CONCLUSION

Our study found that rates of post-EGD aspiration pneumonia are increasing. We found a significant association between various comorbidities and aspiration pneumonia. Our data suggests that we need to optimize these patients before EGD, as the development of aspiration is associated with worsened outcomes. Further prospective studies are needed to clarify these associations.

Criteria for diagnosing aspiration pneumonia in Japan - A scoping review

Aspiration pneumonia accounts for a significantly higher proportion of pneumonia cases in Japan than in Western countries. We conducted a scoping review of the criteria for diagnosing aspiration pneumonia in the literature on aspiration pneumonia reported from Japan, where the incidence of aspiration pneumonia is higher than in Europe and the United States. We searched MEDLINE and the Cochrane Library as literature databases. The search keywords were "aspiration," "pneumonia," and "Japan," combined with AND. After eliminating duplicates, we screened 852 articles and reviewed 112 articles in full, with 58 articles included in the final analysis. Of the 58 articles, 25 adopted the clinical diagnostic criteria for aspiration pneumonia proposed by the Japanese Study Group on Aspiration Pulmonary Disease. The remaining 33 articles used their own diagnostic criteria. There were 12 articles that described the features of images. There were three articles stating that aspiration pneumonitis should be excluded. There were five reports in which all patients were examined for swallowing function disorder. In Japan, the diagnostic criteria for aspiration pneumonia proposed by the Japanese Study Group on Aspiration Pulmonary Disease were used extensively, and various other criteria were also used. Aspiration pneumonia diagnosed according to different criteria should be carefully compared in terms of incidence, therapeutic effects, and prognosis.

In-hospital Outcomes of Aspiration Pneumonia Hospitalizations With Acute Heart Failure: A Nationwide Analysis

Background and Objectives

There is a paucity of data regarding the impact of acute heart failure (AHF) on the outcomes of aspiration pneumonia (AP).

Methods

Using National Inpatient Sample datasets (2016 to 2019), we identified admissions for AP with AHF vs. without AHF using relevant International Classification of Diseases, Tenth Revision codes. We compared the demographics, comorbidities, and outcomes between the two groups.

Results

Out of the 121,097,410 weighted adult hospitalizations, 488,260 had AP, of which 13.25% (n=64,675) had AHF. The AHF cohort consisted predominantly of the elderly (mean age 80.4 vs. 71.1 years), females (47.8% vs. 42.2%), and whites (81.6% vs. 78.5%) than non-AHF cohort (all p<0.001). Complicated diabetes and hypertension, dyslipidemia, obesity, chronic pulmonary disease, and prior myocardial infarction were more frequent in AHF than in the non-AHF cohort. AP-AHF cohort had similar adjusted odds of all-cause mortality (adjusted odds ratio [AOR], 0.9; 95% confidence interval [CI], 0.78-1.03; p=0.122), acute respiratory failure (AOR, 1.0; 95% CI, 0.96-1.13; p=0.379), but higher adjusted odds of cardiogenic shock (AOR, 2.2; 95% CI, 1.30-3.64; p=0.003), and use of mechanical ventilation (MV) (AOR, 1.3; 95% CI, 1.17-1.56; p<0.001) compared to AP only cohort. AP-AHF cohort more frequently required longer durations of MV and hospital stays with a higher mean cost of the stay.

Conclusions

Our study from a nationally representative database demonstrates an increased morbidity burden, worsened complications, and higher hospital resource utilization, although a similar risk of all-cause mortality in AP patients with AHF vs. no AHF.

Association between the amount of rehabilitation and the outcomes in patients with aspiration pneumonia

The appropriate amount of rehabilitation for aspiration pneumonia remains unknown. We conducted a historical cohort study to investigate the association between the amount of rehabilitation provided and the outcome of patients with aspiration pneumonia. A total of 4148 patients with aspiration pneumonia recruited from a database created by JMDC were categorized into three groups based on daily rehabilitation units: none or <1 unit (low-volume group), 1-2 units (medium-volume group), and more than 2 units (high-volume group). The main outcome measures were death in the hospital, discharge home, and length of hospital stay. The results showed that the middle-volume and high-volume groups had significantly fewer in-hospital deaths [middle-volume group, odds ratio (OR) 0.62; 95% confidence interval (CI), 0.46-0.83; high-volume group, OR 0.66; 95% CI, 0.45-0.97], more patients were discharged home (middle-volume group, OR 1.29; 95% CI, 1.03-1.62; high-volume group, OR 2.00; 95% CI, 1.48-2.71), and shorter hospital stay (middle-volume group, coefficient -3.30; 95% CI, -6.42 to -0.19; high-volume group, coefficient -4.54; 95% CI, -8.69 to -0.40) compared with the low-volume group. In conclusion, higher rehabilitation units per day provided to patients with aspiration pneumonia were associated with fewer deaths, more home discharges, and shorter hospital stays.

The upper and lower respiratory tract microbiome in severe aspiration pneumonia

Uncertainty persists whether anaerobic bacteria represent important pathogens in aspiration pneumonia. In a nested case-control study of mechanically ventilated patients classified as macro-aspiration pneumonia (MAsP, n = 56), non-macro-aspiration pneumonia (NonMAsP, n = 91), and uninfected controls (n = 11), we profiled upper (URT) and lower respiratory tract (LRT) microbiota with bacterial 16S rRNA gene sequencing, measured plasma host-response biomarkers, analyzed bacterial communities by diversity and oxygen requirements, and performed unsupervised clustering with Dirichlet Multinomial Models (DMM). MAsP and NonMAsP patients had indistinguishable microbiota profiles by alpha diversity and oxygen requirements with similar host-response profiles and 60-day survival. Unsupervised DMM clusters revealed distinct bacterial clusters in the URT and LRT, with low-diversity clusters enriched for facultative anaerobes and typical pathogens, associated with higher plasma levels of SPD and sCD14 and worse 60-day survival. The predictive inter-patient variability in these bacterial profiles highlights the importance of microbiome study in patient sub-phenotyping and precision medicine approaches for severe pneumonia.

Incidence and characteristics of aspiration pneumonia in adults in Beijing, China, 2011-2017

OBJECTIVES

This study aimed to estimate aspiration pneumonia (AP) incidence and describe comorbid characteristics and mortality in Beijing, China.

STUDY DESIGN

A historical cohort study was conducted based on medical claim records.

METHODS

Patients admitted with a primary diagnosis of AP were identified from approximately 12 million adults who enrolled in the Urban Employee Basic Medical Insurance program in Beijing, China, from January 2011 to December 2017. The incidences of AP and pneumonia with risk factors for aspiration (PRFA) were estimated by a Poisson distribution. The estimated annual percentage change was reported to represent the average percentage change in incidence per year. Characteristics and 6-month and 1-year all-cause mortality rates for AP and suspected AP patients were described and compared with community-acquired pneumonia (CAP).

RESULTS

The incidence rates of hospitalized AP and PRFA were 9.4 (95% confidence interval [CI]: 7.6, 11.3) and 102.9 (95% CI: 95.8, 110.3) per 100,000 person-years, respectively. The incidences increased rapidly with age and were stable across the observed years. Patients with AP and PRFA possessed a greater burden of comorbidities than CAP (mean age-adjusted Charlson comorbidity indices for AP: 7.72, PRFA: 7.83, and CAP: 2.84). The 6-month and 1-year all-cause mortality rates for those with AP and PRFA were higher than those for patients with CAP (6-month mortality, AP: 35.2%, PRFA: 21.8%, CAP: 11.1%; 1-year mortality, AP: 42.7%, PRFA: 26.6%, CAP: 13.2%).

CONCLUSIONS

The incidence of AP and PRFA in Beijing was reported, presenting a full picture of the disease burden. The results provide baseline information for AP prevention.

Potential biomarker proteins for aspiration pneumonia detected by shotgun proteomics using buccal mucosa samples: a cross-sectional case-control study

BACKGROUND

Aspiration pneumonia (AP), which is a major cause of death in the elderly, does present with typical symptoms in the early stages of onset, thus it is difficult to detect and treat at an early stage. In this study, we identified biomarkers that are useful for the detection of AP and focused on salivary proteins, which may be collected non-invasively. Because expectorating saliva is often difficult for elderly people, we collected salivary proteins from the buccal mucosa.

METHODS

We collected samples from the buccal mucosa of six patients with AP and six control patients (no AP) in an acute-care hospital. Following protein precipitation using trichloroacetic acid and washing with acetone, the samples were analyzed by liquid chromatography and tandem mass spectrometry (LC-MS/MS). We also determined the levels of cytokines and chemokines in non-precipitated samples from buccal mucosa.

RESULTS

Comparative quantitative analysis of LC-MS/MS spectra revealed 55 highly (P values < 0.10) abundant proteins with high FDR confidence (q values < 0.01) and high coverage (> 50%) in the AP group compared with the control group. Among the 55 proteins, the protein abundances of four proteins (protein S100-A7A, eukaryotic translation initiation factor 1, Serpin B4, and peptidoglycan recognition protein 1) in the AP group showed a negative correlation with the time post-onset; these proteins are promising AP biomarker candidates. In addition, the abundance of C-reactive protein (CRP) in oral samples was highly correlated with serum CRP levels, suggesting that oral CRP levels may be used as a surrogate to predict serum CRP in AP patients. A multiplex cytokine/chemokine assay revealed that MCP-1 tended to be low, indicating unresponsiveness of MCP-1 and its downstream immune pathways in AP.

CONCLUSION

Our findings suggest that oral salivary proteins, which are obtained non-invasively, can be utilized for the detection of AP.

Cost-effectiveness of professional and mechanical oral care for preventing pneumonia in nursing home residents

BACKGROUND

Pneumonia is common in nursing home residents and is a leading cause of hospitalization and death. Nursing home residents with cerebrovascular diseases and impaired consciousness are at high risk of aspiration pneumonia. Professional and mechanical oral care by dentists and hygienists in addition to daily oral care by caregivers was shown to be effective in preventing pneumonia in nursing home residents. However, professional and mechanical oral care has not been widely provided in Japan, while daily oral care by caregivers has been widely provided as a basic service in nursing homes. This study aimed to evaluate the cost-effectiveness of providing professional and mechanical oral care for preventing pneumonia in nursing home residents.

METHODS

Using a decision tree and Markov modeling, we conducted a cost-effectiveness analysis from the payer's perspective (social insurers and patients) in Japan.

RESULTS

The incremental cost-effectiveness ratio for professional and mechanical oral care compared with daily oral care only was calculated as 4,079,313 Japanese yen (¥; 33,994 United States dollars [US$], US$1 = ¥120) per quality-adjusted life year.

CONCLUSIONS

Using the official value of social willingness to pay for a one-quality-adjusted life year gain in Japan of ¥5 million (US$41,667) as the threshold to judge cost-effectiveness, providing professional and mechanical oral care is cost-effective. Our results suggest professional and mechanical oral care for preventing pneumonia in nursing home residents could be justifiable as efficient use of finite healthcare resources. The results have implications for oral care in nursing homes both in Japan and worldwide.

Pneumonia, Aspiration Pneumonia, or Frailty-Associated Pneumonia?

Pneumonia is a common reason for admission afflicting frail older adults. Those who are the frailest are more likely to be provided with a diagnosis of aspiration pneumonia. This diagnosis has no clear definition and no clinical consensus. It is therefore time to stop attempting to differentiate between pneumonia type and use the term frailty-associated pneumonia.

The diagnosis of aspiration pneumonia in older persons: a systematic review

PURPOSE

Community-acquired pneumonia (CAP) is highly common across the world. It is reported that over 90% of CAP in older adults may be due to aspiration. However, the diagnostic criteria for aspiration pneumonia (AP) have not been widely agreed. Is there a consensus on how to diagnose AP? What are the clinical features of patients being diagnosed with AP? We conducted a systematic review to answer these questions.

METHODS

We performed a literature search in MEDLINE®, EMBASE, CINHAL, and Cochrane to review the steps taken toward diagnosing AP. Search terms for "aspiration pneumonia" and "aged" were used. Inclusion criteria were: original research, community-acquired AP, age ≥ 75 years old, acute hospital admission.

RESULTS

A total of 10,716 reports were found. Following the removal of duplicates, 7601 were screened, 95 underwent full-text review, and 9 reports were included in the final analysis. Pneumonia was diagnosed using a combination of symptoms, inflammatory markers, and chest imaging findings in most studies. AP was defined as pneumonia with some relation to aspiration or dysphagia. Aspiration was inferred if there was witnessed or prior presumed aspiration, episodes of coughing on food or liquids, relevant underlying conditions, abnormalities on videofluoroscopy or water swallow test, and gravity-dependent distribution of shadows on chest imaging. Patients with AP were older, more frailer, and had more comorbidities than in non-AP.

CONCLUSION

There is a broad consensus on the clinical criteria to diagnose AP. It is a presumptive diagnosis with regards to patients' general frailty rather than in relation to swallowing function itself.

Advancing Laryngeal Adductor Reflex Testing Beyond Sensory Threshold Detection

Flexible endoscopic evaluation of swallowing with sensory testing (FEESST) is a promising clinical tool to assess airway integrity via the laryngeal adductor reflex (LAR). The current clinical protocol relies on sensory threshold detection, as relatively little is known about the motor response of this sensorimotor airway protective reflex. Here, we focused on characterizing normative LAR motion dynamics in 20 healthy young participants using our prototype high-pressure syringe-based air pulse device and analytic software (VFtrack™) that tracks vocal fold (VF) motion in endoscopic videos. Following device bench testing for air pulse stimulus characterization, we evoked and objectively quantified LAR motion dynamics in response to two suprathreshold air pulse stimuli (40 versus 60 mm Hg), delivered to the arytenoid mucosa through a bronchoscope working channel. The higher air pressures generated by our device permitted an approximate 1 cm endoscope working distance for continual visualization of the bilateral VFs throughout the LAR. Post hoc video analysis identified two main findings: (1) there are variant and invariant subcomponents of the LAR motor response, and (2) only a fraction of suprathreshold stimuli evoked complete glottic closure during the LAR. While the clinical relevance of these findings remains to be determined, we have nonetheless demonstrated untapped potential in the current FEESST protocol. Our ongoing efforts may reveal LAR biomarkers to quantify the severity of laryngeal pathology and change over time with natural disease progression, spontaneous recovery, or in response to intervention. The ultimate goal is to facilitate predictive modeling of patients at high risk for dysphagia-related aspiration pneumonia.

Characteristics of aspiration pneumonia patients in acute care hospitals: A multicenter, retrospective survey in Northern Japan

BACKGROUND

Pneumonia is a common cause of illness and death of the elderly in Japan. Its prevalence is escalating globally with the aging of population. To describe the latest trends in pneumonia hospitalizations, especially aspiration pneumonia (AP) cases, we assessed the clinical records of pneumonia patients admitted to core acute care hospitals in Miyagi prefecture, Japan.

METHODS

A retrospective multi-institutional joint research was conducted for hospitalized pneumonia patients aged ≥20 years from January 2019 to December 2019. Clinical data of patients were collected from the medical records of eight acute care hospitals.

RESULTS

Out of the 1,800 patients included in this study, 79% of the hospitalized pneumonia patients were aged above 70 years. The most common age group was in the 80s. The ratio of AP to total pneumonia cases increased with age, and 692 out of 1,800 patients had AP. In univariate analysis, these patients had significantly older ages, lower body mass index (BMI), a lower ratio of normal diet intake and homestay before hospitalization, along with more AP recurrences and comorbidities. During hospitalization, AP patients had extended fasting periods, more swallowing assessments and interventions, longer hospitalization, and higher in-hospital mortality rate than non-AP patients. A total of 7% and 2% AP patients underwent video endoscopy and video fluorography respectively. In multivariate analysis, lower BMI, lower C-reactive protein, a lower ratio of homestay before hospitalization, a higher complication rate of cerebrovascular disease, dementia, and neuromuscular disease were noted as a characteristic of AP patients. Swallowing interventions were performed for 51% of the AP patients who had been hospitalized for more than two weeks. In univariate analysis, swallowing intervention improved in-hospital mortality. Lower AP recurrence before hospitalization and a lower ratio of homestay before hospitalization were indicated as characteristics of AP patients of the swallowing intervention group from multivariate analysis. Change in dietary pattern from normal to modified diet was observed more frequently in the swallowing intervention group.

CONCLUSION

AP accounts for 38.4% of all pneumonia cases in acute care hospitals in Northern Japan. The use of swallowing evaluations and interventions, which may reduce the risk of dysphagia and may associate with lowering mortality in AP patients, is still not widespread.

Predictive Value of the Pneumonia Severity Score on Mortality due to Aspiration Pneumonia

Objective: Designing an efficient management strategy for aspiration is of high priority in our aging society because of its high incidence. We evaluated the prognostic value of both the A-DROP (age, dehydration, respiratory, disorientation, and pressure) and the modified A-DROP scoring systems (adding respiratory rate and comorbidity to A-DROP) in patients with aspiration pneumonia.Design: This is a retrospective study using electronic medical records at Saitama Medical University (SMU) hospital.Setting: A 965-bed university tertiary medical center in Japan.Participants: Data were extracted from the electronic medical records of patients from SMU hospital.Methods: In-hospital mortality was compared between two groups: (1) those with a 'severe' to 'advanced severe' A-DROP score; and (2) those with a 'low' to 'middle' A-DROP score. Area under the curve (AUC) for mortality for both the A-DROP and modified A-DROP scoring systems were compared.Results: The in-hospital mortality rates for patients with a high and a low A-DROP score were 28.6% and 9.0%, respectively. The mortality rates in the high modified A-DROP score group and in the low modified A-DROP score group were 28.2% and 9.9%, respectively. These differences in the mortality rates between the two groups were statistically significant for both the A-DROP and the modified A-DROP scoring systems. The AUC of the receiver operating characteristics curve for the A-DROP (0.700; 95% confidence interval, 0.608-0.779) was statistically significant.Conclusion: The A-DROP and modified A-DROP scoring systems are associated with in-hospital mortality in patients with aspiration pneumonia. The A-DROP scoring system is easy to use and may be a clinically valuable tool in the management of aspiration pneumonia.

Aspiration pneumonia: A renewed perspective and practical approach

Aspiration pneumonia (AP) is a sub-type of community-acquired pneumonia (CAP) still poorly recognized especially in the absence of an aspiration event. A further difficulty is the differentiation between AP and aspiration pneumonitis. From a clinical perspective, AP is becoming increasingly relevant as a potential cause of severe and life-threatening respiratory infection among frail and very old patients, particularly among those with CAP requiring inpatient care. Moreover, AP is frequently underdiagnosed and a clear-cut definition of this pathological entity is lacking. There are different factors that increase the risk for aspiration, but other common factors influencing oral colonization such as malnutrition, smoking, poor oral hygiene or dry mouth, are also important in the pathogenesis of AP and should be considered. While there is no doubt in the diagnosis of AP in cases of a recent witnessed aspiration of oropharyngeal or gastric content, we here proposed a definition of AP that also includes silent unobserved aspirations. For this reason, the presence of one or more risk factors of oropharyngeal aspiration is required together with one or more risk factors for oral bacterial colonization. This proposed definition based on expert opinion not only unifies the diagnostic criteria of AP, but also provides the possibility to devise easily applicable strategies to prevent oral colonization.

National Health Burden of Aspiration Pneumonia on Clinical and Operational Outcomes in Patients With Small Bowel Obstruction Requiring Nasogastric Decompression

BACKGROUND

Nasogastric tubes (NGTs) are used for decompression in patients with acute small bowel obstruction (SBO); however, their role remains controversial. There is evidence that NGT use is still associated with high incidence of aspiration pneumonia. The aims of this study were to define the prevalence of aspiration pneumonia in patients with SBO managed with an NGT and estimate the association of aspiration pneumonia with 30-day mortality rates, length of stay (LOS), and hospital costs.

MATERIALS AND METHODS

A retrospective cohort study was done using Medicare Inpatient Standard Analytic Files from 2016 to 2018. Patients hospitalized with SBO and managed with NGT were identified using an algorithm of ICD-10-CM codes. The key exposure was aspiration pneumonia. Outcome measures included 30-day mortality rates, LOS, and hospital costs.

RESULTS

53 715 patients hospitalized with SBO and managed with an NGT were identified and included in the analysis. We observed a prevalence of aspiration pneumonia of 7.3%. The 30-day mortality rate was 31% for those who developed aspiration pneumonia vs. 10% for those without pneumonia (P < .001). Those with aspiration pneumonia, on average, were hospitalized 7.0 days longer (P < .001) and accrued $20,543 greater hospitalization costs (P < .001) than those without pneumonia. Controlling for hospital size and hospital teaching status, we noted a significant association between aspiration pneumonia and increased mortality (P < .001), longer length of stay (P < .001), and higher hospital costs (P < .001).

DISCUSSION

Among patients hospitalized for SBO who required an NGT, aspiration pneumonia was associated with a higher mortality rate, longer hospital LOS, and higher total hospital costs. vv.

Pneumonia: Does Age or Gender Relate to the Presence of an SLP Dysphagia Consultation?

A retrospective study of 1489 hospital records examined the relationship of speech-language pathologist (SLP) consults for dysphagia to age and gender in pneumonia patients from an acute care setting. Age and gender disparities exist in healthcare. The research sought to determine if disparities existed in the presence/absence of SLP dysphagia consults related to age and gender. Results suggested SLPs were consulted on a greater percentage of geriatric patients overall; however, there were differences in the number of consults for each pneumonia type. More males and geriatric patients were seen than females and non-geriatric adults, respectively. Results may be used to address local hospital policies and protocols and thus increase quality of care by improving morbidity and mortality outcomes of geriatric patients with pneumonia.

Aspiration Risk Factors, Microbiology, and Empiric Antibiotics for Patients Hospitalized With Community-Acquired Pneumonia

BACKGROUND

Aspiration community-acquired pneumonia (ACAP) and community-acquired pneumonia (CAP) in patients with aspiration risk factors (AspRFs) are infections associated with anaerobes, but limited evidence suggests their pathogenic role.

RESEARCH QUESTION

What are the aspiration risk factors, microbiology patterns, and empiric anti-anaerobic use in patients hospitalized with CAP?

STUDY DESIGN AND METHODS

This is a secondary analysis of GLIMP, an international, multicenter, point-prevalence study of adults hospitalized with CAP. Patients were stratified into three groups: (1) ACAP, (2) CAP/AspRF+ (CAP with AspRF), and (3) CAP/AspRF- (CAP without AspRF). Data on demographics, comorbidities, microbiological results, and anti-anaerobic antibiotics were analyzed in all groups. Patients were further stratified in severe and nonsevere CAP groups.

RESULTS

We enrolled 2,606 patients with CAP, of which 193 (7.4%) had ACAP. Risk factors independently associated with ACAP were male, bedridden, underweight, a nursing home resident, and having a history of stroke, dementia, mental illness, and enteral tube feeding. Among non-ACAP patients, 1,709 (70.8%) had CAP/AspRF+ and 704 (29.2%) had CAP/AspRF-. Microbiology patterns including anaerobes were similar between CAP/AspRF-, CAP/AspRF+ and ACAP (0.0% vs 1.03% vs 1.64%). Patients with severe ACAP had higher rates of total gram-negative bacteria (64.3% vs 44.3% vs 33.3%, P = .021) and lower rates of total gram-positive bacteria (7.1% vs 38.1% vs 50.0%, P < .001) when compared with patients with severe CAP/AspRF+ and severe CAP/AspRF-, respectively. Most patients (>50% in all groups) independent of AspRFs or ACAP received specific or broad-spectrum anti-anaerobic coverage antibiotics.

INTERPRETATION

Hospitalized patients with ACAP or CAP/AspRF+ had similar anaerobic flora compared with patients without aspiration risk factors. Gram-negative bacteria were more prevalent in patients with severe ACAP. Despite having similar microbiological flora between groups, a large proportion of CAP patients received anti-anaerobic antibiotic coverage.

Antibiotics for Aspiration Pneumonia in Neurologically Impaired Children

OBJECTIVE

To compare hospital outcomes associated with commonly used antibiotic therapies for aspiration pneumonia in children with neurologic impairment (NI).

DESIGN/METHODS

A retrospective study of children with NI hospitalized with aspiration pneumonia at 39 children's hospitals in the Pediatric Health Information System database. Exposure was empiric antibiotic therapy classified by antimicrobial activity. Outcomes included acute respiratory failure, intensive care unit (ICU) transfer, and hospital length of stay (LOS). Multivariable regression evaluated associations between exposure and outcomes and adjusted for confounders, including medical complexity and acute illness severity.

RESULTS

In the adjusted analysis, children receiving Gram-negative coverage alone had two-fold greater odds of respiratory failure (odds ratio [OR] 2.15; 95% CI: 1.41-3.27), greater odds of ICU transfer (OR 1.80; 95% CI: 1.03-3.14), and longer LOS [adjusted rate ratio (RR) 1.28; 95% CI: 1.16-1.41] than those receiving anaerobic coverage alone. Children receiving anaerobic and Gram-negative coverage had higher odds of respiratory failure (OR 1.65; 95% CI: 1.19-2.28) than those receiving anaerobic coverage alone, but ICU transfer (OR 1.15; 95% CI: 0.73-1.80) and length of stay (RR 1.07; 95% CI: 0.98-1.16) did not statistically differ. For children receiving anaerobic, Gram-negative, and P. aeruginosa coverage, LOS was shorter (RR 0.83; 95% CI: 0.76-0.90) than those receiving anaerobic coverage alone; odds of respiratory failure and ICU transfer rates did not significantly differ.

CONCLUSIONS

Anaerobic therapy appears to be important in the treatment of aspiration pneumonia in children with NI. While Gram-negative coverage alone was associated with worse outcomes, its addition to anaerobic therapy may not yield improved outcomes.

Aspiration pneumonia and pneumonitis: a spectrum of infectious/noninfectious diseases affecting the lung

PURPOSE OF REVIEW

Our purpose is to describe aspiration pneumonia/pneumonitis as a spectrum of infectious/noninfectious diseases affecting the lung. We summarize diagnosis, risk factors, treatment, and strategies for prevention of aspiration.

RECENT FINDINGS

Aspiration is present in normal individuals, and disease manifestation depends on the chemical characteristics, frequency, and volume of inoculum. Anaerobes, though present, are no longer the predominant microbes isolated in aspiration pneumonia. Targets for preventing aspiration including improved oral hygiene and positional feeding have had mixed results. Patients diagnosed by clinicians with aspiration pneumonia experience greater morbidity and mortality than patients with community-acquired pneumonia.

SUMMARY

Aspiration pneumonia and pneumonitis are part of the pneumonia continuum and share similarities in pathophysiology, microbiology, and treatment. Modern microbiology demonstrates that the lung is not sterile, and isolates in aspiration pneumonia frequently include aerobes or mixed cultures. Treatment for aspiration pneumonia should include antibiotic coverage for oral anaerobes, aerobes associated with community-acquired pneumonia, and resistant organisms depending on appropriate clinical context. Additional studies targeting prevention of aspiration and investigating the increased morbidity and mortality associated with aspiration pneumonia are warranted.

[Apprentissage par simulation : activité novatrice de formation interprofessionnelle sur la gestion de la dysphagie]

Interprofessional patient simulations are an emerging pedagogical approach that is increasingly being used in the education of health professionals. Although the benefits of patient simulations have been widely documented in the fields of medicine and nursing, few studies have explored the potential of this approach in educating future dietitians. This article describes 4 patient simulations, including 2 interprofessional simulations, focused on the management of dysphagia, which were carried out as part of an Honours Bachelor in Nutrition Sciences program and discusses the potential merits of this teaching method in educating future dietitians.

[Etiology of severe community - acquired pneumonia in adults: results of the first Russian multicenter study]

AIM

to study the etiology of severe community - acquired pneumonia (SCAP) in adults in Russian Federation. SCAP is distinguished by high mortality and socio - economic burden. Both etiology and antimicrobial resistance are essential for appropriate antibiotic choice.

MATERIALS AND METHODS

A prospective cohort study recruited adults with confirmed diagnosis of SCAP admitted to multi - word hospitals of six Russian cities in 2014-2018. Etiology was confirmed by routine culture of blood, respiratory (sputum, endotracheal aspirate or bronchoalveolar lavage) and when appropriate, autopsy samples, urinary antigen tests (L. pneumophila serogroup 1, S. pneumoniae); real - time PCR for identification of "atypical" bacterial pathogens (M. pneumoniae, C. pneumoniae, L. pneumophila) and respiratory viruses (influenza viruses A and B, parainfluenza, human metapneumovirus, etc.) was applied.

RESULTS

Altogether 109 patients (60.6% male; mean age 50.8±18.0 years old) with SCAP were enrolled. Etiological agent was identified in 65.1% of patients, S. pneumoniae, rhinovirus, S. aureus and K. pneumoniae were the most commonly isolated pathogens (found in 43.7, 15.5, 14.1 and 11.3% of patients with positive results of microbiological investigations, respectively). Bacteriemia was seen in 14.6% of patients and most commonly associated with S. pneumoniae. Co - infection with 2 or more causative agents was revealed in 36.6% of cases. Combination of bacterial pathogens (mainly S. pneumoniae with S. aureus or/and Enterobacterales) prevailed - 57.7% of cases; associations of bacteria and viruses were identified in 38.5% of patients, different viruses - in one case.

CONCLUSION

S. pneumoniae was the most common pathogen in adults with SCAP. A high rate of respiratory viruses (mainly rhinovirus and influenza viruses) identification both as mixt infection with bacteria and mono - infection should be taken into account.

Variation in the Diagnosis of Aspiration Pneumonia and Association with Hospital Pneumonia Outcomes

RATIONALE

National efforts to compare hospital outcomes for patients with pneumonia may be biased by hospital differences in diagnosis and coding of aspiration pneumonia, a condition that has traditionally been excluded from pneumonia outcome measures.

OBJECTIVES

To evaluate the rationale and impact of including patients with aspiration pneumonia in hospital mortality and readmission measures.

METHODS

Using Medicare fee-for-service claims for patients 65 years and older from July 2012 to June 2015, we characterized the proportion of hospitals' patients with pneumonia diagnosed with aspiration pneumonia, calculated hospital-specific risk-standardized rates of 30-day mortality and readmission for patients with pneumonia, analyzed the association between aspiration pneumonia coding frequency and these rates, and recalculated these rates including patients with aspiration pneumonia.

RESULTS

A total of 1,101,892 patients from 4,263 hospitals were included in the mortality measure analysis, including 192,814 with aspiration pneumonia. The median proportion of hospitals' patients with pneumonia diagnosed with aspiration pneumonia was 13.6% (10th-90th percentile, 4.2-26%). Hospitals with a higher proportion of patients with aspiration pneumonia had lower risk-standardized mortality rates in the traditional pneumonia measure (12.0% in the lowest coding and 11.0% in the highest coding quintiles) and were far more likely to be categorized as performing better than the national mortality rate; expanding the measure to include patients with aspiration pneumonia attenuated the association between aspiration pneumonia coding rate and hospital mortality. These findings were less pronounced for hospital readmission rates.

CONCLUSIONS

Expanding the pneumonia cohorts to include patients with a principal diagnosis of aspiration pneumonia can overcome bias related to variation in hospital coding.

New perspectives in aspiration community acquired Pneumonia

Introduction: Aspiration pneumonia is a subclass of community-acquired pneumonia that is expected to have an increasing contribution in mortality and morbidity, particularly in the elderly population over the next coming decades. While studies have revealed significant progress in identifying risk factors for aspiration pneumonia, the clinical presentation and diagnosis remain challenging to healthcare providers. Areas covered: We conducted a broad literature review using the MeSH heading in PubMed/MEDLINE of 'aspiration pneumonia' from January 1970 to July 2019. The understanding of the microbiology of aspiration pneumonia has evolved from a possible shift in the causative organisms away from anaerobes to traditional community-acquired pneumonia organisms. The importance of this shift is not yet known, but it has questioned the pathogenic role of anaerobes, appropriate anaerobic testing and the role of these pathogens in the pulmonary microbiome in patients with pneumonia. The identification of risk factors led to strategies to prevent or minimize the risk of aspiration pneumonia with moderate success. Expert opinion: Our expert opinion is that further research is needed to determine the role of the microbiome with aspiration pneumonia and patient risk factors. There is also a great need to develop clinical tools to help providers diagnose, treat, and prevent aspiration pneumonia.

Clinico-radiologic Features of Lung Disease Associated With Aspiration Identified on Lung Biopsy

BACKGROUND

Aspiration-related lung diseases are commonly diagnosed presumptively based on the clinical context and radiologic findings. Limited data exist on the spectrum of clinico-radiologic presentations associated with aspiration.

METHODS

This study reviewed all cases of aspiration identified on lung biopsy encountered at the Mayo Clinic between 2003 and 2017. Demographic and clinical features, including risk factors for aspiration, diagnoses suspected prior to biopsy, imaging findings, and microbiologic data, were analyzed.

RESULTS

A total of 52 consecutive adult cases of aspiration identified on lung biopsy (histologic presence of food or other particulate matter) were included; patients' median age was 59 years (range, 22 to 79 years), 38% were women, and there were five lung transplant recipients. Of these, 63% were diagnosed according to results of surgical biopsy (including four cases of lobectomy) and 37% according to results of transbronchial biopsy. Aspiration was clinically suspected prior to biopsy in 35% of the subjects. Ninety percent of subjects had at least one identifiable risk factor for aspiration; gastroesophageal reflux disease was the most common (62%), followed by a structurally abnormal esophagogastric tract and the use of consciousness-impairing medications. Only 27% of patients reported dysphagia or choking. Chest CT imaging revealed a variety of parenchymal patterns, including bronchiolitis (42%), patchy consolidation (19%), and mass (15%). Of 25 patients undergoing a video-swallow evaluation, 14 (56%) had abnormal results with laryngeal penetration with or without aspiration. Microbial cultures obtained in 21 lung biopsy specimens yielded no pathogens.

CONCLUSIONS

Aspiration can occur in the absence of subjective or demonstrable swallowing difficulties and manifest a broad spectrum of clinico-radiologic presentations.

The perils of 'risk feeding'

'Risk feeding' policies, for when people continue to eat and drink despite a perceived risk of choking or aspiration have become common in recent years. We argue that 'feeding' is demeaning language if referring to a person who is eating and drinking rather than to a healthcare technique and that 'risk-anything' is not how decisions are reached. It is true that patients with dysphagia are often unnecessarily designated nil-by-mouth (NBM), especially after a decision has been made that tube feeding is not indicated or is unwanted. However, risk-feeding policies may perpetuate common misperceptions that there is a straightforward relationship between aspiration and pneumonia and that interventions like NBM or tube feeding will reduce the risk of pneumonia. Such policies may reduce the potential for individualised and flexible decision making: many people's swallowing abilities and preferences fluctuate, sometimes from hour to hour, and staff need to have, and be encouraged to use, common sense, flexibility and judgement in these circumstances. There is also the potential for delays in providing food, fluid and medications if meetings must be held and risk-feeding paperwork completed and signed by someone with the necessary seniority and confidence. Further debate and discussion is required before risk-feeding policies become an established standard of care.

Proportion of Aspiration Pneumonia Cases Among Patients With Community-Acquired Pneumonia: A Single-Center Study in Korea

Objective

To investigate the proportion of aspiration pneumonia cases among patients with community-acquired pneumonia in Korea.

Methods

This retrospective study included patients with community-acquired pneumonia who had been admitted to the emergency department of a university-affiliated tertiary hospital in Gyeonggi Province, Korea between January 1, 2016 and December 31, 2016. Among these patients, those with aspiration pneumonia were identified using ICD-10 codes (J69.^*). Patients with recurrent pneumonia were excluded, as were those who were immunocompromised. The proportion of cases of aspiration pneumonia was calculated, and the characteristics and clinical outcomes of patients with aspiration pneumonia and non-aspiration pneumonia were compared.

Results

The proportion of aspiration pneumonia cases among patients with community-acquired pneumonia was 14.2%. Patients with aspiration pneumonia were significantly more likely to be older (p<0.001) and male (p<0.001), and to have a higher confusion, uremia, respiratory rate, blood pressure, and age ≥65 years (CURB-65) score (p<0.001) as compared to patients with non-aspiration pneumonia. They were also more likely to require admission to the intensive care unit (p<0.001) and a longer hospital stay (p<0.001).

Conclusion

Aspiration pneumonia accounts for 14.2% of all cases of community-acquired pneumonia in Korea. These data may contribute to the establishment of healthcare strategies for managing aspiration pneumonia among Korean adults.

Impact of stroke-associated pneumonia on mortality, length of hospitalization, and functional outcome

OBJECTIVES

Stroke-associated pneumonia (SAP) is common and associated with adverse outcomes. Data on its impact beyond 1 year are scarce.

MATERIALS AND METHODS

This observational study was conducted in a cohort of stroke patients admitted consecutively to a tertiary referral center in the east of England, UK (January 2003-April 2015). Logistic regression models examined inpatient mortality and length of stay (LOS). Cox regression models examined longer-term mortality at predefined time periods (0-90 days, 90 days-1 year, 1-3 years, and 3-10 years) for SAP. Effect of SAP on functional outcome at discharge was assessed using logistic regression.

RESULTS

A total of 9238 patients (mean age [±SD] 77.61 ± 11.88 years) were included. SAP was diagnosed in 1083 (11.7%) patients. The majority of these cases (n = 658; 60.8%) were aspiration pneumonia. After controlling for age, sex, stroke type, Oxfordshire Community Stroke Project (OCSP) classification, prestroke modified Rankin scale, comorbidities, and acute illness markers, mortality estimates remained significant at 3 time periods: inpatient (OR 5.87, 95%CI [4.97-6.93]), 0-90 days (2.17 [1.97-2.40]), and 91-365 days (HR 1.31 [1.03-1.67]). SAP was also associated with higher odds of long LOS (OR 1.93 [1.67-2.22]) and worse functional outcome (OR 7.17 [5.44-9.45]). In this cohort, SAP did not increase mortality risk beyond 1 year post-stroke, but it was associated with reduced mortality beyond 3 years.

CONCLUSIONS

Stroke-associated pneumonia is not associated with increased long-term mortality, but it is linked with increased mortality up to 1 year, prolonged LOS, and poor functional outcome on discharge. Targeted intervention strategies are required to improve outcomes of SAP patients who survive to hospital discharge.

Antithrombotic therapies for elderly patients: handling problems originating from their comorbidities

Compared with younger people, elderly people have higher risks for both thrombosis and bleeding. Furthermore, comorbidities frequently found in elderly patients complicate the management of antithrombotic therapy. Thus, when treating these patients, physicians often find it difficult to incorporate the principles of evidence-based medicine and must determine the best treatment option for each patient. Recently, in the fields of cerebrovascular and cardiovascular diseases, researchers have been rapidly accumulating new data regarding antithrombotic therapy, particularly in the areas of direct oral anticoagulants (DOACs) and dual antiplatelet therapy (DAPT). However, information related to elderly patients receiving antithrombotic therapy is still relatively limited. There are also more and more publications describing how antithrombotic therapy affects the pathogenesis of non-thrombotic diseases. Similarly, the number of reports concerning adherence to this therapy has been increasing lately. However, no review articles detailing these findings have yet been published. In actual clinical practice, antithrombotic therapy in the elderly is not a treatment strategy targeted to only one organ or disease. Rather, it requires an interdisciplinary approach aimed at maintaining the overall health of the patient. Thus, to assist physicians’ decision-making processes for elderly patients, an overview of recent findings related to the evidence regarding concomitant medications, the secondary benefits of antithrombotic therapy for patients with comorbidities, and evidence regarding medication adherence is provided.

Effect of combination of pre- and postoperative pulmonary rehabilitation on onset of postoperative pneumonia: a retrospective cohort study based on data from the diagnosis procedure combination database in Japan

BACKGROUND

To examine the effect of rehabilitation on postoperative pulmonary complication when it is conducted in combination of both before and after lung cancer surgery, as compared with either before or after surgery and no rehabilitation.

METHODS

A retrospective cohort study was conducted to examine the effect of rehabilitation before and after lung cancer surgery on the causes of postoperative pneumonia. Data were collected from the diagnosis procedure combination (DPC) database. Patients admitted who received operative treatment for a new primary (ICD codes: C34) were selected. The inclusion criteria were patients who had pneumonectomy, malignant tumor surgery for the lung (thoracotomy), or thoracoscopic surgery (endoscopic; treatment code: K511-00, K513-00~03, and K514-00, 02). The exclusion criteria were patients who had a lung transplantation (treatment code: K514-03~06), suspected diagnosis, and a pneumonia within 3 months before being diagnosed as having lung cancer. Main outcome was onset of postoperative pneumonia.

RESULTS

Among 76,739 lung cancer patients, 15,146 who underwent lung cancer surgery were included in the analysis. In the combination of pre- and postoperative group, as compared with the preoperative [odds ratio (OR), 95% confidence interval (CI) 2.8, 1.8-4.4], postoperative (1.9, 1.6-2.3), and no rehabilitation group (2.5, 2.1-2.8), the onset of pneumonia was less frequent.

CONCLUSIONS

Combination of preoperative and postoperative rehabilitations significantly prevents postoperative pneumonia as compared with having preoperative, postoperative, or no rehabilitation.

National Trends in Admission for Aspiration Pneumonia in the United States, 2002-2012

RATIONALE

Aspiration pneumonia is a subset of pneumonias prevalent in elderly patients and patients with neurologic disorders. Researchers in previous studies mostly reported incidence and/or mortality rates based on regional data or in specific subgroups of patients. There is a paucity of nationwide data in the contemporary U.S.

POPULATION

OBJECTIVES

To describe U.S. national trends in acute care hospital admission for aspiration pneumonia from 2002 to 2012.

METHODS

We used the U.S. National (Nationwide) Inpatient Sample database to identify patients admitted with a primary diagnosis of aspiration pneumonia between 2002 and 2012. We estimated trends in the incidence, in-hospital mortality, length of stay, and total hospitalization cost for patients admitted for aspiration pneumonia and stratified on the basis of patient age (≥65 yr vs. <65 yr). Multivariable logistic regression analysis was used to identify independent predictors for in-hospital mortality.

RESULTS

A total of 406,798 patients (weighted total, 1,741,517) admitted for aspiration pneumonia were included in this study. There were 84,200 (20.7%) patients younger than 65 years of age and 322,598 patients (79.3%) aged 65 years or older. From 2002 to 2012, the overall incidence of aspiration pneumonia decreased from 8.2 to 7.1 cases per 10,000 people, and in-hospital mortality decreased from 18.6 to 9.8%. For patients aged 65 years or older, the incidence decreased from 40.7 to 30.9 cases per 10,000 people, and the in-hospital mortality decreased from 20.7 to 11.3%. The median total hospitalization charges increased in both groups (age ≥65 yr, from $16,173 to $30,280; age <65 yr, from $17,517 to $30,526). In multivariable logistic analysis, patients aged 65 years or older or treatment in a nonteaching hospital were independent predictors of in-hospital mortality.

CONCLUSIONS

The incidence and mortality of patients admitted to acute care hospitals for aspiration pneumonia decreased between 2002 and 2012 in the United States. This difference was more evident for elderly patients. However, the cost of hospitalization almost doubled. Being older than 65 years of age is an independent predictor of in-hospital mortality among patients admitted for aspiration pneumonia. Strategies to prevent aspiration pneumonia in the community should be implemented in the aging U.S.

POPULATION

Impact of the number of aspiration risk factors on mortality and recurrence in community-onset pneumonia

Introduction

The clinical significance of the number of aspiration risk factors in patients with pneumonia is unknown as yet. In the present study, we clarify the significance of the number of aspiration risk factors for mortality and recurrence in pneumonia patients.

Methods

This study included 322 patients hospitalized with pneumonia between December 2014 and June 2016. We investigated associations between the number of aspiration risk factors present (orientation disturbance, bedridden, chronic cerebrovascular disease, dementia, sleeping medications and gastroesophageal disease) and 30-day and 6-month mortality, and pneumonia recurrence within 30 days.

Results

Patients were categorized by number of risk factors present into groups of 0–1, 2, 3, and 4 or more. Of a total of 322 patients, 93 (28.9%) had 0–1 risk factors, 112 (34.8%) had 2, 88 (27.3%) had 3, and 29 (9.0%) had 4 or more risk factors. The percentages of patients with recurrence of pneumonia were 13.0%, 33.0%, 43.2%, and 54.2% in the 0–1, 2, 3, and 4 or more risk factor groups, respectively. The percentages of patients with 30-day mortality were 2.2%, 5.4%, 11.4%, and 24.1%, and those of patients with 6-month mortality were 6.6%, 24.5%, 30.7%, and 50.0%, in the 0–1, 2, 3, and 4 or more risk factor groups, respectively.

Conclusions

The number of aspiration risk factors was associated with increases in both mortality and recurrence in pneumonia patients. Therefore, in clinical practice, physicians should consider not only the presence of aspiration risks but also the number of aspiration risk factors in these patients.

Time trends in incidence and outcomes of hospitalizations for aspiration pneumonia among elderly people in Spain (2003-2013)

BACKGROUND

Aspiration pneumonia (AP) is an infectious process causing high rates of mortality. The purpose of this study was: 1, to describe the incidence from 2003 to 2013 of AP hospitalizations; 2, to assess time trends in hospital outcomes variables, and; 3, to identify the factors independently associated with in-hospital mortality (IHM).

METHODS

A retrospective observational study using the Spanish National Hospital Database, with patients discharged between January 2003 and December 2013 was conducted. Inclusion criteria were: Subjects aged 75years or older whose medical diagnosis included AP events code according to the ICD-9-CM: 507.x in the primary diagnosis field. Patient variables, up to 14 discharge diagnoses per patient, and up to 20 procedures performed during the hospital stay (ICD-9-CM), Charlson Comorbidity Index, readmission, length of hospital stay (LOHS), and IHM were analyzed.

RESULTS

We included 111,319 admissions (53.13% women). LOHS decreased in both sexes (P<0.001) and was significantly higher in men (10.4±10.31 vs. 9.56±10.02days). Readmissions increased significantly in women during the study (13.94% in 2003 to 16.41% in 2013, P<0.001). In both sex, IHM was significantly higher in >94years old subjects (OR: 1.43, 95%CI 1.36-1.51) and in those with readmissions (OR: 1.20, 95%CI 1.15-1.23). For the entire population, time trend analyses showed a significant decrease in mortality from 2003 to 2013 (OR: 0.96, 95%CI 0.95-0.97).

CONCLUSIONS

Patients with AP are older, male, and have more comorbidities than those without AP. Over time, LOHS and IHM decreased in both sexes, but readmissions increased significantly in women.

Prognostic implications of aspiration pneumonia in patients with community acquired pneumonia: A systematic review with meta-analysis

Aspiration pneumonia is thought to be associated with a poor outcome in patients with community acquired pneumonia (CAP). However, there has been no systematic review regarding the impact of aspiration pneumonia on the outcomes in patients with CAP. This review was conducted using the MOOSE guidelines: Patients: patients defined CAP. Exposure: aspiration pneumonia defined as pneumonia in patients who have aspiration risk. Comparison: confirmed pneumonia in patients who were not considered to be at high risk for oral aspiration. Outcomes: mortality, hospital readmission or recurrent pneumonia. Three investigators independently identified published cohort studies from PubMed, CENTRAL database, and EMBASE. Nineteen studies were included for this systematic review. Aspiration pneumonia increased in-hospital mortality (relative risk, 3.62; 95% CI, 2.65–4.96; P < 0.001, seven studies) and 30-day mortality (3.57; 2.18–5.86; P < 0.001, five studies). In contrast, aspiration pneumonia was associated with decreased ICU mortality (relative risk, 0.40; 95% CI, 0.26–0.60; P < 0.00001, four studies). Although there are insufficient data to perform a meta-analysis on long-term mortality, recurrent pneumonia, and hospital readmission, the few reported studies suggest that aspiration pneumonia is also associated with these poor outcomes. In conclusion, aspiration pneumonia was associated with both higher in-hospital and 30-day mortality in patients with CAP outside ICU settings.

Muscle Mass Loss Is a Potential Predictor of 90-Day Mortality in Older Adults with Aspiration Pneumonia

OBJECTIVES

To investigate the association between loss of muscle mass and aspiration pneumonia (AP).

DESIGN

Prospective observational cohort.

SETTING

Acute geriatric hospital.

PARTICIPANTS

Individuals admitted to the hospital for AP (N = 151; mean age 85.9; 49.7% male).

MEASUREMENTS

Appendicular skeletal muscle index (ASMI; appendicular skeletal muscle mass divided by height squared) was used to evaluate muscle mass. Data on age, sex, body mass index, Mini Nutritional Assessment-Short Form score, Barthel Index score, Charlson Comorbidity Index score, and pneumonia severity (Japanese version of the CURB-65 (C (confusion), U (blood urea nitrogen ≥20 mg/dL), R (respiratory rate ≥30 breaths/min), B (systolic blood pressure <90 mmHg or diastolic blood pressure ≤60 mmHg), 65 (aged ≥65) severity score (A-DROP)) were obtained. Outcomes included 30- and 90-day mortality.

RESULTS

Mild, moderate, severe, and extremely severe AP were observed in 1.3%, 70.2%, 25.8%, and 2.6% of participants, respectively. On Kaplan-Meier analysis, participants in the lowest ASMI quartile for each sex were more likely to die than those in the other quartiles (log-lank test P = .005). Multivariate logistic analyses showed that ASMI and A-DROP were independent predictors of 90-day mortality; only A-DROP was a significant predictor of 30-day mortality (P < .001). Cox regression analysis also showed that the first ASMI quartile was independently associated with mortality (hazard ratio = 2.19; 95% confidence interval = 1.06-4.52; P = .03).

CONCLUSION

Low muscle mass is a potential predictor of long-term mortality in individuals with AP. Prospectively preventing muscle mass deterioration may be beneficial for recovery from AP in older adults.

Oropharyngeal dysphagia in older persons - from pathophysiology to adequate intervention: a review and summary of an international expert meeting

Oropharyngeal dysphagia (OD) is a highly prevalent and growing condition in the older population. Although OD may cause very severe complications, it is often not detected, explored, and treated. Older patients are frequently unaware of their swallowing dysfunction which is one of the reasons why the consequences of OD, ie, aspiration, dehydration, and malnutrition, are regularly not attributed to dysphagia. Older patients are particularly vulnerable to dysphagia because multiple age-related changes increase the risk of dysphagia. Physicians in charge of older patients should be aware that malnutrition, dehydration, and pneumonia are frequently caused by (unrecognized) dysphagia. The diagnosis is particularly difficult in the case of silent aspiration. In addition to numerous screening tools, videofluoroscopy was the traditional gold standard of diagnosing OD. Recently, the fiberoptic endoscopic evaluation of swallowing is increasingly utilized because it has several advantages. Besides making a diagnosis, fiberoptic endoscopic evaluation of swallowing is applied to evaluate the effectiveness of therapeutic maneuvers and texture modification of food and liquids. In addition to swallowing training and nutritional interventions, newer rehabilitation approaches of stimulation techniques are showing promise and may significantly impact future treatment strategies.

Aspiration and Non-Aspiration Pneumonia in Hospitalized Children With Neurologic Impairment

BACKGROUND AND OBJECTIVE

Children with neurologic impairment (NI) are commonly hospitalized for different types of pneumonia, including aspiration pneumonia. We sought to compare hospital management and outcomes of children with NI diagnosed with aspiration versus nonaspiration pneumonia.

METHODS

A retrospective study of 27 455 hospitalized children aged 1 to 18 years with NI diagnosed with pneumonia from 2007 to 2012 at 40 children's hospitals in the Pediatric Health Information System database. The primary exposure was pneumonia type, classified as aspiration or nonaspiration. Outcomes were complications (eg, acute respiratory failure) and hospital utilization (eg, length of stay, 30-day readmission). Multivariable regression was used to assess the association between pneumonia type and outcomes, adjusting for NI type, comorbid conditions, and other characteristics.

RESULTS

In multivariable analysis, the 9.7% of children diagnosed with aspiration pneumonia experienced more complications than children with nonaspiration pneumonia (34.0% vs 15.2%, adjusted odds ratio [aOR] 1.2 (95% confidence interval [CI] 1.1-1.3). Children with aspiration pneumonia had significantly longer length of stay (median 5 vs 3 days; ratio of means 1.2; 95% CI 1.2-1.3); more ICU transfers (4.3% vs 1.5%; aOR 1.4; 95% CI 1.1-1.9); greater hospitalization costs (median $11 594 vs $5162; ratio of means 1.2; 95% CI 1.2-1.3); and more 30-day readmissions (17.4% vs 6.8%; aOR 1.3; 95% CI 1.2-1.5).

CONCLUSIONS

Hospitalized children with NI diagnosed with aspiration pneumonia have more complications and use more hospital resources than when diagnosed with nonaspiration pneumonia. Additional investigation is needed to understand the reasons for these differences.

Community-Acquired Pneumonia Requiring Hospitalization among U.S. Adults

BACKGROUND

Community-acquired pneumonia is a leading infectious cause of hospitalization and death among U.S. adults. Incidence estimates of pneumonia confirmed radiographically and with the use of current laboratory diagnostic tests are needed.

METHODS

We conducted active population-based surveillance for community-acquired pneumonia requiring hospitalization among adults 18 years of age or older in five hospitals in Chicago and Nashville. Patients with recent hospitalization or severe immunosuppression were excluded. Blood, urine, and respiratory specimens were systematically collected for culture, serologic testing, antigen detection, and molecular diagnostic testing. Study radiologists independently reviewed chest radiographs. We calculated population-based incidence rates of community-acquired pneumonia requiring hospitalization according to age and pathogen.

RESULTS

From January 2010 through June 2012, we enrolled 2488 of 3634 eligible adults (68%). Among 2320 adults with radiographic evidence of pneumonia (93%), the median age of the patients was 57 years (interquartile range, 46 to 71); 498 patients (21%) required intensive care, and 52 (2%) died. Among 2259 patients who had radiographic evidence of pneumonia and specimens available for both bacterial and viral testing, a pathogen was detected in 853 (38%): one or more viruses in 530 (23%), bacteria in 247 (11%), bacterial and viral pathogens in 59 (3%), and a fungal or mycobacterial pathogen in 17 (1%). The most common pathogens were human rhinovirus (in 9% of patients), influenza virus (in 6%), and Streptococcus pneumoniae (in 5%). The annual incidence of pneumonia was 24.8 cases (95% confidence interval, 23.5 to 26.1) per 10,000 adults, with the highest rates among adults 65 to 79 years of age (63.0 cases per 10,000 adults) and those 80 years of age or older (164.3 cases per 10,000 adults). For each pathogen, the incidence increased with age.

CONCLUSIONS

The incidence of community-acquired pneumonia requiring hospitalization was highest among the oldest adults. Despite current diagnostic tests, no pathogen was detected in the majority of patients. Respiratory viruses were detected more frequently than bacteria. (Funded by the Influenza Division of the National Center for Immunizations and Respiratory Diseases.).