Trends in Incidence and Drug Prescriptions for Croup in Children Under 5 Years of Age: A 2002-2019 Population-Based Study.

BACKGROUND: Tracking national croup trends can provide important insights for childhood health management. This study aimed to analyze the incidence and drug prescription trends in Korean children over a two-decade period. METHODS: This population-based study encompassed 479,783 children aged < 5 years from 2002-2019, utilizing the National Health Insurance Service-National Sample Cohort. We identified participants with a primary croup diagnosis who were admitted to or visited the emergency room. Age-specific and age-adjusted incidence rates/10,000 person-years were calculated. We assessed using orthogonal polynomial contrasts and stratified by various factors (sex, age, residential area, economic status, comorbidities, and healthcare facility types). We observed changes in the use of five medications: inhaled steroids, systemic steroids, inhaled epinephrine, antibiotics, and short-acting bronchodilators. Generalized binomial logistic regression was used to analyze factors influencing prescription strategies. RESULTS: In 2002, the croup-related visits were 16.1/10,000 person-years, increasing to 98.3 in 2019 (P for trend < 0.001). This trend persisted, regardless of age, sex, region, and economic status. Children with comorbid atopic dermatitis or asthma maintained consistent croup rates, while those without comorbidities increased. Treatment trends showed decreasing antibiotic (73-47%) and oxygen use (21.3-3.4%), with increasing nebulized epinephrine (9.3-41.5%) and multiple drug prescriptions (67.8-80.3%). Primary care centers exhibited a greater increase in prescription usage and hospitalization duration than did tertiary healthcare institutions. CONCLUSION: Over the past two decades, croup incidence has risen, accompanied by increased epinephrine use and decreased antibiotic prescriptions. Longer hospitalization and higher medication use were mainly observed in primary care facilities.

The Omicron variant of COVID-19 and its association with croup in children: a single-centre study in Hong Kong.

INTRODUCTION: The fifth wave of the coronavirus disease 2019 (COVID-19) pandemic in Hong Kong was dominated by the Omicron variant, which may cause more upper airway involvement in children. This study was performed to identify any associations between the Omicron variant of COVID-19 and croup in children. METHODS: This retrospective study reviewed the electronic medical records of patients admitted to Tuen Mun Hospital in Hong Kong from 1 January 2018 to 31 March 2022 under the diagnostic code for croup (J05.0 in the International Classification of Diseases 10th Edition). Patients were categorised into three groups according to their admission periods, namely, non-COVID-19, COVID-19-pre-Omicron, and COVID-19-Omicron groups. Disease associations and severity were compared according to incidence, Westley Croup Score, length of hospital stay, medication use, respiratory support, and intensive care unit admissions. RESULTS: The COVID-19 incidence among patients with croup was significantly higher in the COVID-19-Omicron group than in the COVID-19-pre-Omicron group (90.0% vs 2.0%; P<0.001). Compared with patients in the COVID-19-pre-Omicron and non-COVID-19 groups, patients in the COVID-19-Omicron group also had a higher Westley score (moderate and severe disease in the COVID-19-Omicron group: 56.7%; COVID-19-pre-Omicron group: 22.0%, P=0.004; non-COVID-19 group: 24.8%, P<0.001), longer median hospital stay (COVID-19-Omicron group: 3.00 days; COVID-19-pre-Omicron group: 2.00 days, P<0.001; non-COVID-19 group: 2.00 days, P=0.034), and higher mean dexamethasone requirement (COVID-19-Omicron group: 0.78 mg/kg; COVID-19-pre-Omicron group: 0.49 mg/kg, P<0.001; non-COVID-19 group: 0.58 mg/kg, P=0.001). CONCLUSION: The Omicron variant of COVID-19 is associated with croup and can cause more severe disease in Hong Kong children.

Pediatric Croup Due to Omicron Infection Is More Severe Than Non-COVID Croup.

OBJECTIVE: Croup due to infection with the omicron variant of COVID is an emerging clinical entity, but distinguishing features of omicron croup have not yet been characterized. We designed a study to compare the clinical features of croup patients presenting to the pediatric emergency department pre-COVID pandemic with COVID-positive croup patients who presented during the initial omicron surge. METHODS: This was a retrospective observational cohort study of children 0 to 18 years old who presented to our urban, tertiary care pediatric emergency department with symptoms of croup. The study compared a cohort of croup patients who presented in the year before the onset of the COVID pandemic to a cohort of COVID-positive croup patients who presented during the initial omicron surge. The primary outcomes included illness severity and treatments required in the emergency department. The secondary outcome was hospital admission rate. RESULTS: There were 499 patients enrolled in the study, 88 in the omicron croup cohort and 411 in the classic croup cohort. Compared with the classic croup patients, omicron croup patients were more likely to present with stridor at rest (45.4% vs 31.4%; odds ratio [OR], 1.82; confidence interval [CI], 1.14-2.91) and hypoxia (3.4% vs 0.5%; OR, 7.22; CI, 1.19-43.86). Omicron croup patients required repeat dosing of inhaled epinephrine in the emergency department more often (20.4% vs 6.8%; OR, 3.51; CI, 1.85-6.70), and they were more likely to require respiratory support (9.1% vs 1.0%; OR, 10.18; CI, 2.99-34.60). Admission rates were significantly higher for omicron croup patients than for classic croup patients (22.7% vs 3.9%; OR, 7.26; CI, 3.58-14.71), and omicron croup patients required intensive care more frequently (5.7% vs 1.5%; OR, 4.07; CI, 1.21-13.64). CONCLUSIONS: Pediatric patients with omicron croup develop more severe disease than do children with classic croup. They are more likely to require additional emergency department treatments and hospital admission than patients with croup before the COVID pandemic.

Variation in Emergency Department Use of Racemic Epinephrine and Associated Outcomes for Croup.

OBJECTIVES: Racemic epinephrine (RE) is commonly administered for croup in the emergency department (ED). Our objectives were to examine variation in RE use between EDs, to determine whether ED variation in RE use is associated with hospital or patient factors, and to evaluate the associations between the rates of hospital-specific ED RE use and patient outcomes. METHODS: We performed a retrospective cohort study using the Pediatric Heath Information System of children aged 3 months to 10 years with croup in the ED. We used mixed-effects regression to calculate risk-standardized proportions of patients receiving RE in each ED and to analyze the relationship between risk-standardized institutional RE use and individual patient odds of hospital admission, ICU admission, and ED revisits. RESULTS: We analyzed 231 683 patient visits from 39 hospitals. ED administration of RE varied from 14% to 48% of visits (median, 24.5%; interquartile range, 20.0%-27.8%). A total of 8.6% of patients were hospitalized and 1% were admitted to the ICU. After standardizing for case mix and site effects, increasing ED use of RE per site was associated with increasing patient odds of hospital admission (odds ratio [OR], 1.39-95%; confidence interval [CI], 1.01-1.91), but not ICU admission (OR, 1.39; 95% CI, 0.99-1.97) or ED revisit (OR, 1.00; 95% CI, 0.92-1.09). CONCLUSIONS: In this large, observational study, RE administration varied widely across EDs. Increased RE use by site was associated with increased odds of hospital admission for individual patients when controlling for patient factors. These results suggest further standardization of RE use in children with croup is warranted.

Croup Associated With SARS-CoV-2: Pediatric Laryngotracheitis During the Omicron Surge.

In this retrospective analysis, we describe weekly croup and corresponding viral prevalence patterns in a pediatric quaternary care system in metropolitan Atlanta. We characterize a series of 24 patients with croup associated with SARS-CoV-2 infection and show that this clinical presentation increased substantially in frequency during the period of high Omicron vs Delta transmission.

Croup Admissions: Can We Shrink the Elephant in the Room?

OBJECTIVE: This pilot study aims to identify potential predictors of postadmission interventions of hospitalized croup patients and derive a risk model aimed at reducing hospitalizations for croup. METHODS: Data were collected on all croup hospitalizations for patients aged 1 month to 17 years admitted through a community hospital's emergency department (ED) between 2012 and 2017. Potential predictors were obtained from the electronic medical records including demographics, vital signs, ED length of stay, preintervention and postintervention Westley Croup Score (WCS), number of racemic epinephrine nebulizations administered, time to dexamethasone administration, preexisting conditions, and additional interventions during hospitalization. Statistical analysis used the outcome "patient received racemic epinephrine after hospital admission (yes/no)" to identify characteristics of the child or ED visit associated with that outcome. Preliminary analyses using stepwise logistic regression, tree models, and random forests suggested predictors, interactions among predictors, and the form of their association with the outcome. A final analysis used logistic regression. RESULTS: A total of 116 croup admissions were included, of which 19 (16%) received racemic epinephrine posthospitalization. These characteristics were identified as having some predictive power: sex, preexisting conditions, and preintervention and postintervention WCS, along with the interaction between sex and postintervention WCS. Logistic regression estimated an equation describing the probability of postadmission intervention, permitting the choice among admission thresholds giving different sensitivities and specificities. CONCLUSIONS: There appear to be promising predictors in croup patients presenting to the ED, which might help stratify risk for interventions after the ED encounter and thus reduce the number of potentially avoidable admissions.

Pediatric croup with COVID-19.

We describe three previously healthy children, admitted from our emergency department (ED) to our free-standing children's hospital, as the first documented cases of croup as a manifestation of SARS-CoV-2 infection. All three cases (ages 11 months, 2 years, and 9 years old) presented with non-specific upper-respiratory-tract symptoms that developed into a barky cough with associated stridor at rest and respiratory distress. All were diagnosed with SARS-CoV-2 by polymerase chain reaction testing from nasopharyngeal samples that were negative for all other pathogens including the most common etiologies for croup. Each received multiple (≥3) doses of nebulized racemic epinephrine with minimal to no improvement shortly after medication. All had a prolonged period of time from ED presentation until the resolution of their stridor at rest (13, 19, and 21 h). All received dexamethasone early in their ED treatment and all were admitted. All three received at least one additional dose of dexamethasone, an atypical treatment occurrence in our hospital, due to each patient's prolonged duration of symptoms. One child required heliox therapy and admission to intensive care. All patients were eventually discharged. Pathogen testing is usually not indicated in croup, but with "COVID-19 croup," SARS-CoV-2 testing should be considered given the prognostic significance and prolonged quarantine implications. Our limited experience with this newly described COVID-19 croup condition suggests that cases can present with significant pathology and might not improve as rapidly as those with typical croup.

Predictors of Hospitalization for Children With Croup, a Population-Based Cohort Study.

OBJECTIVES: We sought to determine predictors of hospitalization for children presenting with croup to emergency departments (EDs), as well as predictors of repeat ED presentation and of hospital readmissions within 18 months of index admission. We also aimed to develop a practical tool to predict hospitalization risk upon ED presentation. METHODS: Multiple deterministically linked health administrative data sets from Ontario, Canada, were used to conduct this population-based cohort study between April 1, 2006 and March 31, 2017. Children born between April 1, 2006, and March 31, 2011, were eligible if they had 1 ED visit with a croup diagnosis. Multivariable logistic regression was used to determine factors associated with hospitalization, subsequent ED visits, and subsequent croup hospitalizations. A multivariable prediction tool and associated scoring system were created to predict hospitalization risk within 7 days of ED presentation. RESULTS: Overall, 1811 (3.3%) of the 54 981 eligible children who presented to an Ontario ED were hospitalized. Significant hospitalization predictors included age, sex, Canadian Triage and Acuity Scale score, gestational age at birth, and newborn distress. Younger patients and boys were more likely to revisit the ED for croup. Our multivariable prediction tool could forecast hospitalization up to a 32% probability for a given patient. CONCLUSIONS: This study is the first population-based study in which predictors of hospitalization for croup based on demographic and historical factors are identified. Our prediction tool emphasized the importance of symptom severity on ED presentation but will require refinement before clinical implementation.

Epidemiological analysis of croup in the emergency department using two national datasets.

OBJECTIVES: To characterize cases of croup presenting to emergency departments (EDs) nationwide, analyze trends, and determine readmission rates. METHODS: Retrospective review of the Nationwide Emergency Department Sample (2007-2014) and the National Hospital Ambulatory Medical Care Survey (2008-2015). RESULTS: Both databases provided similar descriptive statistics. Annual mean of 352,388 (weighted) cases in the National Emergency Department Sample (1.35% of ED cases). Average age and male:female ratio 2.50 years and 1.95:1, respectively. Peak incidence was in autumn (October = 13.7%) with troughs in the summer (July = 3.7%). 21.3% received nebulizers, <1% laryngoscopic or airway procedures, 75.1% steroids, and 13.3% antibiotics. Of the patients receiving antibiotics, 16.0% had isolated croup. 3.0% of cases were admitted to the hospital. No trend was identified in the incidence of croup, mean age, or antibiotic and steroid usage. Hospital admission rates decreased (4.0%-2.3%) and nebulizer usage increased (14.6%-27.5%; p < 0.05). 5% of patients represented repeat admissions (were seen within 72 h prior). CONCLUSIONS: Croup imposes a significant burden on the ED. Although hospital admissions decreased, annual incidence in the ED remained stable. The majority of cases are in males less than three years old, and 5.0% of patients represented readmissions. Only three-quarters received glucocorticoids despite the proven benefits, including reducing readmission rates. Antibiotic usage was high, with a large number representing potential cases of inappropriate antibiotic use.

Accuracy of Provider-Documented Child Immunization Status at Hospital Presentation for Acute Respiratory Illness.

OBJECTIVES: To assess (1) the accuracy of child immunization status documented by providers at hospital presentation for acute respiratory illness and (2) the association of provider-documented up-to-date (UTD) status with immunization receipt during and after hospitalization. METHODS: We conducted a retrospective cohort analysis of children ≤16 years old treated for asthma, croup, bronchiolitis, or pneumonia at a children's hospital between July 2014 and June 2016. Demographics, clinical characteristics, and provider-documented UTD immunization status (yes or no) at presentation were obtained from the medical record. We compared provider-documented UTD status to the gold standard: the child's UTD status as documented in the Washington State Immunization Information System (WAIIS). The sensitivity, specificity, and positive predictive value of provider-documented UTD status were calculated. We assessed the association of provider-documented UTD status and immunization during and within 30 days posthospitalization using multivariable logistic regression. RESULTS: Among 478 eligible children, 450 (94%) had provider-documented UTD status at hospital presentation and an active WAIIS record. Overall, 92% and 42% were UTD by provider documentation and WAIIS records, respectively, with provider-documented UTD status having 98.4% sensitivity (95% confidence interval [CI]: 95.4%-99.7%), 12.2% specificity (95% CI: 8.5%-16.8%), and 44.6% positive predictive value (95% CI: 39.7%-49.5%). Per WAIIS records, 20% and 44% of children who were due for vaccines received a vaccine during or within 30 days posthospitalization, respectively. There was no significant association between provider-documented UTD status and immunization during or after hospitalization. CONCLUSIONS: Provider-documented UTD immunization status at hospital presentation for children with respiratory illnesses overestimates UTD status, creating missed opportunities for immunization during and after hospitalization.

[Maternal occupational hazards during pregnancy and allergy in the first year of life as risk factors of laryngotracheitis recurrence in сhildren].

OBJECTIVE: Introduction: Some studies have found associations between maternal occupational hazards during pregnancy and allergy in children. The role of allergy and maternal occupational hazards in predisposition to laryngotracheitis (LT) needs to be clarified. The aim: Objective of the research was to evaluate the possibility of relationship between maternal occupational hazards during pregnancy and allergy in the first year of life in children with LT and recurrent laryngotracheitis (RLT), as well as the debut timing of LT and RLT depending on allergy. PATIENTS AND METHODS: Materials and methods: A questionnaire was used to obtain life history of 405 children aged 6-14 years: 133 children with LT (1-3 episodes of LT), 74 children with RLT (4 or more episodes of LT) and 198 age matched children of control group. RESULTS: Results: The percentage of children with allergy in case of RLT was 48,6% and exceeded the percentage of children with allergy in case of LT and control group in 1,7 and 2,1 times, correspondingly (p<0,01). The tendency (p=0,06) towards increase of the percentage of children with allergy among children with RLT in case of maternal occupational health hazards has been revealed. Among children with RLT percentage of those who had allergy and the debut timing in the first year of life exceeded 3 times the corresponding percentage in children with LT (p<0,01). There was no difference in the debut timing of LT and RLT between children with and without allergу. CONCLUSION: Conclusions: Maternal occupational health hazards during pregnancy and allergy in the first year of life may be considered as risk factors of RLT in children.

Air pollution is associated with incidence of viral croup among children living in Kraków area, Poland.

BACKGROUND: Air pollution is a severe problem in Poland, with Kraków area being among the regions with the worse air quality. Viral croup or pseudocroup is a common childhood disease that may manifest with severe upper respiratory tract obstruction. Our aim was to evaluate the associations between incidence and severity of viral croup symptoms among children living in Kraków area, Poland, and air pollution. METHODS: The retrospective cross-sectional study included Kraków area residents <18 years of age admitted to the Emergency Department of St. Louis Children Hospital in Kraków, Poland over 2-year period. Daily mean concentrations of air pollutants: particulate matter (PM10 and PM2.5), nitric oxides (NOx), carbon oxide (CO), sulfur dioxide, ozone, and benzene were retrieved from public database of measurements performed at three local stations. Numbers of cases of viral croup per week were correlated with weekly mean concentrations of air pollutants. Mean air temperature was treated as a cofactor. RESULTS: During the studied period, mean concentrations of PM10, PM2.5, and NOx exceeded the allowable levels (yearly means) specified by Polish law regulations. Significant positive correlations of moderate strength were observed between weekly mean concentrations of most air pollutants, especially PM10, PM2.5, CO and benzene, and numbers of cases of viral croup recorded per week, confirmed in the analysis restricted to non-holiday period and to winter months only. The correlations between NOx, CO, benzene and croup prevalence were independent of temperature in non-holiday period. CONCLUSIONS: Our results support adverse impact of air pollution on children's respiratory health.

Prenatal phthalate exposure was associated with croup in Swedish infants.

AIM: This study examined whether prenatal phthalate exposure was associated with lower or upper airway inflammation in infants. METHODS: From 2007 to 2010, we used liquid chromatography-tandem mass spectrometry, adjusted for creatinine, to analyse 14 phthalate metabolites and one phthalate replacement in the urine of 1062 Swedish mothers at a median of 10 weeks of pregnancy. This was used to determine any associations between prenatal phthalate exposure and croup, wheezing or otitis in their offspring until 12 months of age, using logistic regression, adjusted for potential confounders. RESULTS: There were significant associations between phthalate metabolites of butyl-benzyl phthalate (BBzP) and di-ethyl-hexyl phthalate (DEHP) concentrations in maternal prenatal urine and croup in 1062 infants during the first year of life, when adjusted for potential confounders. A dose-response relationship was found between prenatal phthalates exposure and maternal reported croup in the children, with a significant association in boys. There was no clear indication with regard to associations between prenatal phthalate exposure and wheezing or otitis media in the children during the first year of life. CONCLUSION: Our analysis suggests that exposure to BBzP and DEHP phthalates was associated with maternal reports of croup in infants up to 12 months of age.

Prognostic factors and importance of recognition of adult croup.

OBJECTIVES: Croup, or laryngotracheobronchitis, is a common disease in childhood. On the other hand, to our knowledge, there are only 14 cases in six English literatures describing adult croup (AC). The clinical features of AC have not been well known. METHODS: We conducted a retrospective analysis of medical records of 18 patients with AC during the period from 2008 to 2016. RESULTS: None of the 18 patients required an urgent airway intervention. Univariate analysis indicated that the duration of symptoms was significantly longer in patients with cough (p < .01) and younger patients (age < 60, p = .037). The duration of subglottic edema was significantly longer in female (p = .035), patients with high levels of CRP (≥1 mg/dL, p = .049), and patients with cough symptom (p = .035). CONCLUSIONS: Female, young age (<60 years), the symptom of cough, and high levels of CRP should be recognized as signs of prolonged AC. It is important to confirm the diagnosis of AC by laryngoscopic examination, which also help to avoid airway intervention.

Bronchoscopy findings in recurrent croup: A systematic review and meta-analysis.

IMPORTANCE: The etiology of recurrent croup is often anatomic. Currently there is no set criteria for determining who should undergo diagnostic bronchoscopy and which patients are at most risk for having a clinically significant finding. Few studies have addressed these questions. OBJECTIVE: To identify risk factors for clinically significant findings on bronchoscopy in children with recurrent croup and the frequency of bronchoscopy findings in general. DATA SOURCES: PUBMED, Ovid MEDLINE, EMBASE. STUDY SELECTION: Articles addressing bronchoscopy in children with recurrent croup, up to July 2016, were reviewed. Related keywords and medical subject headings were used during the search. The abstracts were reviewed to determine suitability for inclusion based on a set of criteria. Manual crosscheck of references was performed. DATA EXTRACTION: We analyzed the bronchoscopy findings of individual patients in each study and their associated risk factors when available. RESULTS: We reviewed 11 articles, published between 1992 and 2016, including 885 patients (654 males, 237 females). Only 5 studies, including 455 patients, had sufficient data for meta-analysis. Our study revealed that the three most common bronchoscopy findings were subglottic stenosis, reflux changes, and broncho/tracheomalacia. Only 8.7% of patients were noted to have clinically significant findings on bronchoscopy. Meta analysis showed an association between significant bronchoscopy findings and History of Intubation [OR = 5.17, 95% CI 2.65-10.09], Inpatient Consultation [OR = 4.01, 95% CI 1.44-11.20], Age < 3 [OR = 3.22, 95% 1.66-6.27], Age < 1 [OR = 2.86, 95% CI 1.28-6.40], and Prematurity [OR = 2.90, 95% CI 1.39-6.06]. Our study found a high incidence of a History of GERD (20%) and Asthma/Allergies (35%) among patients with recurrent croup, but these variables did not reach statistical significance in patients with significant bronchoscopy findings ([OR = 1.62, 95% CI 0.79-3.30], [OR = 0.57, 95% CI 0.30-1.08] respectively). CONCLUSION: The risk factors most associated with clinically significant bronchoscopy findings in recurrent croup are Intubation, Inpatient Consultation, Age < 3, Age <1, and Prematurity. A History of GERD and Asthma/Allergy, though highly prevalent in recurrent croup patients, were not statistically associated with significant bronchoscopy findings. RELEVANCE: The results should guide physicians in selecting which recurrent croup patients are most at risk for significant findings and thus may warrant bronchoscopy.

Estimates of Parainfluenza Virus-Associated Hospitalizations and Cost Among Children Aged Less Than 5 Years in the United States, 1998-2010.

BACKGROUND: Parainfluenza virus (PIV) is the second leading cause of hospitalization for respiratory illness in young children in the United States. Infection can result in a full range of respiratory illness, including bronchiolitis, croup, and pneumonia. The recognized human subtypes of PIV are numbered 1-4. This study calculates estimates of PIV-associated hospitalizations among U.S. children younger than 5 years using the latest available data. METHODS: Data from the National Respiratory and Enteric Virus Surveillance System were used to characterize seasonal PIV trends from July 2004 through June 2010. To estimate the number of PIV-associated hospitalizations that occurred annually among U.S. children aged <5 years from 1998 through 2010, respiratory hospitalizations from the Healthcare Cost and Utilization Project Nationwide Inpatient Sample were multiplied by the proportion of acute respiratory infection hospitalizations positive for PIV among young children enrolled in the New Vaccine Surveillance Network. Estimates of hospitalization charges attributable to PIV infection were also calculated. RESULTS: Parainfluenza virus seasonality follows type-specific seasonal patterns, with PIV-1 circulating in odd-numbered years and PIV-2 and -3 circulating annually. The average annual estimates of PIV-associated bronchiolitis, croup, and pneumonia hospitalizations among children aged <5 years in the United States were 3888 (0.2 hospitalizations per 1000), 8481 per year (0.4 per 1000 children), and 10,186 (0.5 per 1000 children), respectively. Annual charges for PIV-associated bronchiolitis, croup, and pneumonia hospitalizations were approximately $43 million, $58 million, and $158 million, respectively. CONCLUSIONS: The majority of PIV-associated hospitalizations in young children occur among those aged 0 to 2 years. When vaccines for PIV become available, immunization would be most effective if realized within the first year of life.

Inpatient hospitalizations for croup.

OBJECTIVES: Croup is a common childhood respiratory illness that can result in hospitalization and significant morbidity. This study reviewed records of patients hospitalized with croup to determine characteristics associated with increased inpatient treatment and length of stay (LOS). METHODS: Eligible patients were admitted between January 2006 and December 2010 and had discharge diagnosis of croup. Patients were included if they received either racemic epinephrine or systemic corticosteroids during their emergency department or hospital treatment. Patients were excluded for incomplete data on medication or vital signs timing. Hospitalization and treatment decisions were at the discretion of the treating physician. RESULTS: The study analyzed 365 hospitalizations involving 327 patients, 72% male, 62% white, with median age of 16.7 months. Median LOS was 31.7 hours. Patients required racemic epinephrine treatments after hospitalization in 179 cases (49%; mean, 1.33 treatments; range, 0-13; median, 0), and 176 patients (48%) received a dose of systemic corticosteroids after hospital admission. Patients who required racemic epinephrine treatments after hospitalization were indistinguishable from those who did not, based on demographics, past history, or presenting vital signs. Patients with history of croup, history of intubation, or with oxygen saturation <95% on presentation all had increased LOS compared with those without these findings (P < .05). CONCLUSIONS: Fifty-one percent of patients hospitalized with croup did not require inpatient racemic epinephrine treatments. Those with lower oxygen saturations on presentation or past history of croup or intubation were more likely to have prolonged or complicated hospital course.