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Original Investigation |

Trends in Orbital Complications of Pediatric Rhinosinusitis in the United States FREE

Gregory Capra, MD1; Bryan Liming, MD2; Mark E. Boseley, MD2; Matthew T. Brigger, MD, MPH1
[+] Author Affiliations
1Department of Otolaryngology–Head and Neck Surgery, Naval Medical Center San Diego, San Diego, California
2Department of Otolaryngology–Head and Neck Surgery, Madigan Army Medical Center, Tacoma, Washington
JAMA Otolaryngol Head Neck Surg. 2015;141(1):12-17. doi:10.1001/jamaoto.2014.2626.
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Published online

Importance  Several studies have documented the prevalence and treatment of orbital complications secondary to pediatric rhinosinusitis, but to our knowledge, none have investigated the national health care burden of this disease since the introduction of the heptavalent pneumococcal vaccine (PCV-7).

Objective  To identify the current public health burden of orbital complications of pediatric rhinosinusitis, and to determine if the introduction of the PCV-7 has resulted in a change in national practice patterns.

Design, Setting, and Participants  Population-based study using the 2000 and 2009 Kids’ Inpatient Databases to gather data on a sample of all pediatric discharges in the United States during the years 2000 and 2009. Children diagnosed as having orbital complications of sinusitis were identified by corresponding International Classification of Diseases, Ninth Revision (ICD-9) codes. Database analyses generated national estimates of summary statistics and comparison of trends over the 9-year period.

Interventions  Database analysis.

Main Outcomes and Measures  National health care trends according to year. End points assessed included prevalence, age, sex, length of hospital stay, and treatment of disease.

Results  The estimated prevalence of orbital complications of sinusitis requiring hospitalization in the United States has slightly decreased from 5338 (95% CI, 4956-5720) admissions in 2000 to 4511 (95% CI, 4165-4858) in 2009. However, the mean age has increased from 4.77 (95% CI, 4.56-4.97) years to 6.07 (95% CI, 5.87-6.26) years. The proportion of children undergoing surgical treatment increased from 0.108 (95% CI, 0.093-0.123) to 0.195 (95% CI, 0.176-0.213). Total charges increased from $4 140 000 (95% CI, $3 440 000-$4 830 000) to $10 000 000 (95% CI, $8 480 000-$11 600 000) with a mean charge per admission increasing from $8390 (95% CI, $7096-$9685) in 2000 to $22 656 (95% CI, $19 997-$25 314) in 2009. The mean length of stay remained stable at 3.67 (95% CI, 3.37-3.97) to 4.05 (95% CI, 3.81-4.29) hospital days.

Conclusions and Relevance  The public health impact of orbital complications of pediatric rhinosinusitis continues to be substantial. Since the institution of the PCV-7 vaccine, national trends demonstrate a slightly decreased prevalence of hospital admissions. However, there is a shifting trend toward an older age at admission and a higher proportion of children undergoing surgical treatment.

Orbital complications are known sequelae of pediatric rhinosinusitis. In fact, published clinical practice guidelines for the diagnosis and treatment of pediatric acute bacterial sinusitis recognize that intraorbital complications are the most common complication of acute bacterial sinusitis.1 The ethmoid sinus is the nidus of orbital spread in most cases, with the frontal and maxillary sinuses the source less frequently.25 One study6 found that 100% of patients with subperiosteal abscesses (SPAs) demonstrated concurrent sinusitis in at least 1 sinus, while 63% had multiple sinus involvement. Theories suggesting why a sinus infection causes a subsequent postseptal orbital complication generally revolve around the ease by which infection and inflammation can traverse the lamina papyracea. This thin bony septa between the orbit and the paranasal sinus is naturally porous, is susceptible to congenital dehiscences, has large vascular foramina, and has the potential for open suture lines. All of these properties have been implicated as possible routes of infectious transmission between the paranasal sinuses and orbit.4,5 In contrast, preseptal disease is commonly a complication of trauma or dacrocystitis.2

As described by Chandler et al,7 periorbital and orbital infections are categorized based on location of infection. The categories represent a progression of severity from mild preseptal cellulitis to potentially deadly cavernous sinus thrombosis. Given the potential morbidity and even mortality, treatment strategies include aggressive intravenous antibiotics, topical nasal decongestants, and potentially surgical drainage. While there has been controversy over the evolving roles of surgery vs medical treatment, it is clear that orbital complications of rhinosinusitis remain a clinically significant problem.3,811

Traditionally, Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis have been the most commonly implicated pathogens in acute bacterial rhinosinusitis.1 The introduction of the H influenza type b (HiB) vaccine in 1985 altered the landscape of many pediatric infectious diseases.2,4,9 Although HiB has not been completely eradicated, studies have shown a shift in microbiological trends of acute pediatric infections related to epiglottitis, meningitis, rhinosinusitis, periorbital infections, and otitis media.1216

The heptavalent pneumococcal conjugate vaccine (Prevnar or PCV-7) was introduced in 2000 for children younger than 24 months. Many authors have studied the effects of the vaccine on common pediatric diseases. McKinley et al15 discovered that few orbital infections were S pneumoniae in origin in the post–PCV-7 population. Similarly, Peña et al16 concluded that fewer S pneumoniae infections occurred, while an increase in Staphylococcus aureus prevalence was seen in these types of infections. With changing microbiologic characteristics of orbital complications secondary to pediatric rhinosinusitis over the first decade of the PCV-7 introduction, it could be expected that the national health care impact of this disease may similarly be affected. The purpose of this study was to examine these national trends with regards to the prevalence, treatment, and overall charges of orbital complications of pediatric rhinosinusitis for the years 2000 and 2009, corresponding to the introduction and widespread administration of the PCV-7 vaccine.

This study was approved by the institutional review board of the Naval Medical Center San Diego. The data are from the Kids’ Inpatient Database (KID), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality (AHRQ).17 The 2000 and 2009 KIDs were used to gather data on a sample of all pediatric discharges younger than 18 years in the United States during 2000 and 2009. These data are a representative sample of discharges occurring in the United States during those years. The sampling strategy is single stage and is designed to select 10% of uncomplicated in-hospital births as well as 80% of complicated births and other pediatric admissions from each frame hospital. Discharge weights were according to AHRQ protocol using poststratification of 6 characteristics of each hospital (ownership or control, bed size, teaching status, rural or urban location, and US region, freestanding children’s hospital) in order to calculate national estimate data. The 2000 KID includes 2784 hospitals from 27 states, and the 2009 KID includes 4121 hospitals from 44 states.

Given the known natural association of orbital cellulitis with sinusitis, all children requiring admission with a diagnosis of orbital cellulitis were identified by the International Classification of Diseases, Ninth Revision (ICD-9) code 37601. Children who had a trauma or injury code were excluded from the analysis. The population generated by this search was then stratified according to applicable HCUP Procedure Clinical Classification Software codes for nasal or orbital surgical procedures. Other information, such as sex, mean total charges, and mean length of hospital stay was also obtained. Analysis using each database’s weighted sampling schema generated national estimates of summary statistics.

The national public health burden of pediatric orbital complications in 2000 and 2009 is estimated in the Table. Based on the weighted estimates, the prevalence of orbital complications for the years 2000 and 2009 were 5338 (95% CI, 4956-5720) and 4511 (95% CI, 4165-4858), respectively, for individuals 18 years or younger. The US census population data estimates of this age group for the years 2000 and 2009 were 72.3 million and 74.5 million, respectively.18,19 This gives an approximate estimate of incidence for these 2 populations of nearly 7.38 children per 100 000 in 2000 and 6.05 per 100 000 in 2009. Mean ages between the 2 groups demonstrated an increase from 4.77 (95% CI, 4.56-4.97) years to 6.07 (95% CI, 5.87-6.26) years over this time span. The median age showed a similar trend. Sex distribution remained stable, with a slight male predominance at 57.6% (CI, 55.4%-59.7%) in 2000 and 59.9% (CI, 58.1%-61.8%) in 2009.

Table Graphic Jump LocationTable.  National Estimates for Admissions for Orbital Complications of Sinusitisa

Children hospitalized in the year 2000 incurred hospital charges greater than $4 million and accounted for 19 592 (95% CI, 17 488-21 696) inpatient days. These charges more than doubled in 2009 to $10 million, although the total inpatient days of 18 293 (95% CI, 16 378-20 209) were not significantly different. Mean charges were substantially more in 2009, with estimates of $22 656 (95% CI, $19 997-$25 314) per hospitalization compared with $8390 (95% CI, $7096-$9685) in the year 2000. Despite the differences in total and mean charges per hospital stay, the length of stay of 3.67 (95% CI, 3.37-3.97) days prior to PCV-7 was similar to the post–PCV-7 era at 4.05 (95% CI, 3.81-4.29) days.

The data showed an increasing trend toward surgery, whereby the estimated total number of those surgically treated increased from 579 (95% CI, 493-665) in 2000 to 879 (95% CI, 760-998) in 2009. This represents an increase from 10.8% (95% CI, 9.3%-12.3%) of patients to 19.5% (95% CI, 17.6%-21.3%) between these years. The surgical age was consistent between the 2 groups, with an average age of 8.43 (95% CI, 7.72-9.14) years in 2000 and 9.02 (95% CI, 8.63-9.41) years in 2009. In contrast, a slight increase in age for medically treated patients was seen. An increase from 4.29 (95% CI, 4.08-4.51) years to 5.33 (95% CI, 5.13-5.52) years was observed for the age of medically treated patients for these years. Across the years, medically treated patients were younger than the surgical age of patients. As would be expected, the total charges for surgical patients between these 2 groups were significantly different. In 2000, mean charges for surgically treated patients were $25 348 (95% CI, $17 294-$33 401), while in 2009 it increased to $53 251 (95% CI, $43 881-$62 620). However, the mean length of stay between these 2 groups was similar, 6.69 (95% CI, 5.83-7.56) and 6.89 (95% CI, 6.14-7.63) days, respectively. Similarly, the length of stay for the medically treated patients was not significantly different between the 2 years, with a mean of 3.21 (95% CI, 2.89-3.52) days in 2000 compared with 3.33 (95% CI, 3.16-3.49) days in 2009. The total charges for these years were $6371 (95% CI, $5405-$7337) and $15 298 (95% CI, $13 552-$17 403) in 2000 and 2009, respectively.

The effect of vaccines has been substantial in combatting childhood infectious diseases. This is no more evident than with the introduction of the HiB vaccine.16 However, the overall effect from a national perspective may be difficult to extrapolate from single-institution studies. Although a vaccine may reduce the prevalence of a specific causative pathogen, disease trends themselves can go unchanged, and vaccines could hasten the emergence of new pathogens. Furthermore, it is important in this era of increased awareness of health care economics to identify how health care dollars are spent. This knowledge will better shed light on allocation of resources and the burden with which a disease places on the health system. Large-scale population level databases fill our knowledge gap and are essential in providing accurate epidemiologic data that can be applied toward better understanding national trends. However, they are not without their own limitations. When coupled with institutional studies, the information we can glean from large databases may shed light on a disease and aid in developing new prevention strategies.

Our goal was to compare pre–PCV-7 era and post–PCV-7 era hospitalizations related to orbital complications of pediatric rhinosinusitis in order to detect trends related to the vaccination for S pneumococcus in the pediatric population. To our knowledge, no prior study has evaluated this relationship on a national level. Using the same rationale described by Peña et al16 regarding the concept of herd immunity, we chose to compare KID data from 2000 and 2009. Between these years, we found a slight decrease in prevalence of severe rhinosinusitis resulting in hospital admission for orbital complications from 2000 to 2009. It is difficult to impart a definite cause and effect relationship between the decrease in S pneumoniae infections and the decrease in severe pediatric orbital complications of rhinosinusitis. It may also depend on specific bacterial isolates combined with other factors.1 In fact, the study by Peña et al16 supports this theory. When comparing these 2 eras, they found a 13% rise in cases after the introduction of the vaccine. Cultures from their patients prior to the vaccine’s introduction predominately demonstrated the presence of S pneumoniae, but this pathogen was absent in all aspirates for their post–PCV-7 group. Instead, a dramatic rise in S aureus was seen in these patients, with a trend toward a growing percentage of cultures demonstrating methicillin-resistant S aureus (MRSA). These data are supported by another study,13 which showed S pneumonia to predominate prior to 2000. However, in the late 2000s, infections caused by S pneumoniae have occurred less frequently giving way to more staphylococcal infections, including MRSA.2,8,9,11,2022 Although these data suggest that PCV-7 has had a dramatic affect in the reduction of invasive S pneumoniae infections, other factors may be at work, such as emerging antibiotic resistance, S pneumoniae strains not covered by PCV-7, or other unelucidated host factors.16,21 In 2010 the PCV-13 vaccine was made available, which may ultimately further shift bacterial isolates. As these data become more widely available, future investigations are warranted.

Historically, males have been more likely than females to present with orbital complications of rhinosinusitis.9,11,2123 This was the case in our data, which showed a male predominance in the pre–PCV-7 and post–PCV-7 eras that has not significantly changed. In these 2 groups, males represented 57.6% and 59.9% of the populations for 2000 and 2009. This is consistent with the findings of another database study for 2006,24 which found that males comprised 59.5% of patients, and with the report by Peña et al,16 who found that males were more likely to be affected regardless of the vaccine.

Historically, orbital complications of sinusitis tend to occur in children younger than 10 years.9,11,21 In studies prior to PCV-7 immunizations, Garcia and Harris10 found an average age at complications of 7.2 years. In the post–PCV-7 era, Sedaghat et al23 found patients had an average age of 8.6 years, although they found that age was not associated with increased complication rates based on multivariate analysis. For the years 2000 and 2009, our study demonstrated an increase in the mean age at presentation from 4.77 to 6.07 years, suggesting a trend of increased age of presentation as more children were vaccinated. Likewise, Peña et al16 found that older children were more commonly affected by orbital complications in the post–PCV-7 era. The exact reason for this disparity in age between the years 2000 and 2009 is unclear but once again may have to do with the interaction of bacterial isolate and host factors. One could argue that despite the widespread dissemination of PCV-7 in 2000, not all children were initially vaccinated. Peña et al16 suggested that true herd immunity did not occur until 2003, and thus it is possible that the older age of presentation in the post–PCV-7 group may reflect children who failed to benefit from herd immunity. Another argument may lie in the type of microbiologic infections in older children. A 2012 study25 of chronic rhinosinusitis aspirates in children found that Staphylococcus species accounted for most cases, of which older children were more likely to experience polymicrobial infections. This is in contrast to younger children, who seem to be single nasopharyngeal pathogen carriers.26 The companion studies by Gordts et al13,27 support this theory in their findings prior to 2000. They found that middle meatus aspirates in 50 children were most likely to be represented by the common upper respiratory tract pathogens H influenzae, M catarrhalis, and S pneumoniae, which represented 50% of cultures. In contrast, only 2% of adults had S pneumoniae cultures. Adult pathogens were instead highly represented by coagulation-negative Staphylococcus species, Corynebacterium species, and S aureus.27

Both historically and in these databases, age also seems to affect the surgical rate of patients with orbital complications. In one study,28 age was predictive of the need for surgery, with nonsurgical patients averaging 6.1 years while surgical patients averaged 10.1 years. Peña et al16 also found that older children were taken back to the operating room earlier than younger children, but the exact reason for this was unclear. However, this same study found no significant difference in surgery rates (17% and 22%) for the pre–PCV-7 and post–PCV-7 eras. Garcia and Harris10 showed that children younger than 9 years were successfully treated medically, while older children had an increased likelihood of requiring surgical drainage. Our national data support these findings. In both 2000 and 2009, the mean age of surgically treated patients was significantly higher than those who were medically treated (Table). In both years the medically treated mean age averaged about age 5 years, while the surgical patient was close to the age of 9 years. Although polymicrobial or more virulent infections may account for the age discrepancy, another explanation may lie in the development of the paranasal sinuses. Dewan et al6 found that children with frontal sinusitis or nonmedial SPAs were more likely to be older and require surgical treatment compared with their younger counterparts. This may be explained by the lack of paranasal sinus development in the younger population.

Since the publication of the article by Garcia and Harris10 in 2000, it has been thought that a shift away from surgical treatment of orbital complications toward primarily medical treatment of this disease has occurred.3,6,8 These authors10 showed prospectively that 93% of children younger than 9 years with small, medial SPAs, no frontal sinusitis, and no visual impairment could be safely treated medically. Since its publication, authors2,8,9,22,29 have sought to better define other characteristics of patients who can be safely treated medically. These studies have regularly focused on the radiographic size and location of SPAs. In contrast to the perception that patients are treated more conservatively today than in years past, our data suggest that surgical rates have actually increased with time. We found that despite stricter criteria for medical treatment, surgical rates nearly doubled from 10.8% in 2000 to 19.5% in 2009. This is compared with the study by Mahalingam-Dhingra et al,28 which showed that surgical rates of 12.4% for 2006, which are closer to our pre–PCV-7 data surgical rates. Our data also are not in agreement with those of Peña et al,16 who found no significant difference in surgical rates between their study groups. The reason for this discrepancy remains unclear. Again, this may reflect the age of patients, presumed microbiological nature of infection, regional variation in KID data sources, or the sample size.

Regardless of the increase in surgical rates between 2000 and 2009, it seems that the length of hospital stays has not changed over the decade. A direct comparison of children who were surgically treated also showed that they did not have longer stays, and neither did those medically treated. However, within each year group, length of stay was significantly different between the medical and surgical patient groups. These data are in agreement with those of one study16 that found surgically treated patients averaged 7.1 days of hospital admission compared with 3.4 days for their medically treated counterparts. Factors that may affect length of hospital stays are numerous and are not accounted for in this study. A natural conclusion is that surgically treated patients represent failed medical treatment or a more virulent disease process, and therefore their length of stay is greater. Abscess reaccumulation may also affect length of stay, as Dewan et al6 found in their study. They also found that surgical technique influences duration of hospital stay. Those patients with combined endoscopic sinus surgery and SPA drainage had significantly shorter length of stay, likely related to fewer abscess reaccumulation rates. Another study22 also noted that hospital stays can be influenced by location of orbital complications. Ketenci et al22 found that patients with medial abscesses spent 3 to 9 days as in-patients, whereas those with superior abscesses spent 6 to 11 days on average. Finally, health care administrative factors, such as insurance policies, may also effect duration of hospital stay.

To no one’s surprise, health care charges for orbital complications of acute rhinosinusitis have dramatically risen over the previous decade. This is another important set of information that institutional studies fail to discuss. We found that the rates of charges more than doubled from 2000 to 2009, with the most recent data showing $10 million in total charges averaging $22 656 per hospital visit. Surgical treatment was more expensive in 2009 ($53 251) than in 2000 ($25 348). Medical charges more than doubled from $6371 in 2000 to $15 298 in 2009. However, it is important to acknowledge that although charges have significantly increased, our analysis did not focus on the true cost of care or health care dollars collected, which may be markedly different from the amount charged.

As with any database study, there are limitations to the data. Foremost, the use of ICD-9-CM coding is only as accurate as the data coded. Some patients with inaccurate diagnoses may be erroneously included or excluded from this data set. Furthermore, the data do not include all 50 states, but instead represent a sample of the population used to make projections based on a weighted sampling algorithm. As a result, the health care burden may be inaccurate and may affect the generalizability of these data. These patients also represent the more severe cases of orbital complications that required inpatient admission, and it may reflect a change in criteria for outpatient treatment over time. However, it can be assumed that mildly effected patients likely provide a less significant burden on our health care system. Finally, hospital charges do not necessarily correlate with true health care costs, which cannot be accounted for with these data.

The public health impact of pediatric patients with orbital complications secondary to rhinosinusitis continues to be substantial. In the post–PCV-7 era, many of the characteristics of disease remain stable, including a male predominance, a significantly older surgical population, and the average length of stay. In contrast, the prevalence has slightly decreased, the average age of patients has increased from 4.77 to 6.07 years, and surgical rates have nearly doubled from 2000 to 2009. Finally, health care charges have shown a dramatic increase in just 9 years, which places an added burden on an already stressed health care system.

Corresponding Author: Matthew T. Brigger, MD, MPH, Department of Otolaryngology–Head and Neck Surgery, Naval Medical Center San Diego, 34800 Bob Wilson Dr, San Diego, CA 92134 (matthew.brigger@med.navy.mil).

Submitted for Publication: June 24, 2014; final revision received August 23, 2014; accepted August 31, 2014.

Published Online: October 23, 2014. doi:10.1001/jamaoto.2014.2626.

Author Contributions: Dr Capra had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

Study concept and design: Capra, Boseley, Brigger.

Acquisition, analysis, or interpretation of data: Capra, Liming, Brigger.

Drafting of the manuscript: Capra, Liming.

Critical revision of the manuscript for important intellectual content: All authors.

Statistical analysis: Capra, Brigger.

Administrative, technical, or material support: Capra.

Study supervision: Boseley, Brigger.

Conflict of Interest Disclosures: None reported.

Disclaimer: The views expressed in this article are those of the authors and do not necessarily reflect the official policy or position of the Department of the Navy, the Department of the Army, the Department of Defense, or the US Government.

Previous Presentation: This study was presented at the 2014 Annual Meeting of the American Society of Pediatric Otolaryngology; May 16-18, 2014; Las Vegas, Nevada.

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Figures

Tables

Table Graphic Jump LocationTable.  National Estimates for Admissions for Orbital Complications of Sinusitisa

References

Wald  ER, Applegate  KE, Bordley  C,  et al; American Academy of Pediatrics.  Clinical practice guideline for the diagnosis and management of acute bacterial sinusitis in children aged 1 to 18 years. Pediatrics. 2013;132(1):e262-e280.
PubMed   |  Link to Article
Baring  DE, Hilmi  OJ.  An evidence based review of periorbital cellulitis. Clin Otolaryngol. 2011;36(1):57-64.
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