Inpatient medical management of severe pediatric obesity: Literature review and case reports

Introduction

One in five children (ages 2–19 years) has obesity in the United States. Pediatric obesity is considered one of the most serious global health problems of this century, with rates projected to increase 130% over the next two decades (1, 2). Hospitals are seeing increased rates of severe pediatric obesity impacting treatment and outcomes for acute hospitalizations, regardless of presenting diagnosis (1, 3–6). Inpatient hospitalization presents an opportunity to engage in nutritional counseling, obesity-related comorbidity screening, and initiation of anti-obesity pharmacotherapy (7, 8). This is similar to screening and counseling for other conditions while inpatient, yet studies show these assessments rarely occur (7, 9, 10). There is minimal data about inpatient obesity interventions, despite the fact that severe obesity affects the acute needs, treatment, and outcomes for many medical conditions in both adult and pediatric cohorts (11). This absence of information presents major challenges to pediatric healthcare systems attempting to provide long-term, comprehensive care for youth with obesity.

Pediatric obesity independently increases morbidity and mortality across the lifespan (4, 5). Obesity has been linked to worse outcomes in hospitalized patients with prolonged length of stay, greater costs, increased infections, and increased post-operative complications (4, 5, 12–14). In pediatrics, specifically, there are significant medication safety risks for youth living with obesity, given that the majority of medications utilized inpatient have weight-based dosing. In fact, three recent reviews found that two-thirds of all prescribed medications in children with obesity were either sub-therapeutic or supra-therapeutic (1, 12, 15).

Despite negative inpatient outcomes, studies show that obesity is rarely documented or considered an important factor in inpatient care, unless it is thought to directly affect the treatment for the acute illness (6, 8). A recent study found that fewer than 40% of children's hospitals have universal policies to identify and treat patients with obesity, with BMI calculated in only 35% of pediatric inpatient encounters (12). This is particularly problematic as adult studies have found that the only factor associated with increased likelihood of treatment for obesity while inpatient was a diagnosis of obesity in the medical record (7). A pediatric study found that a documented diagnosis of obesity was associated with being 35 times more likely to receive interventions while hospitalized (9). Although there is a paucity of literature exploring weight loss counseling during acute hospitalizations, data collected in adults with obesity admitted for non-weight related conditions revealed that the majority of patients with obesity are receptive to weight loss advice while hospitalized (16).

Weight loss, even small percentages, can have long-lasting effects on health, particularly in children. BMI z-score decrease of 0.5 standard deviations has been positively correlated with improved cardiovascular risk profiles and improved lung function (17, 18). Weight loss, in the acute setting, has also been shown to have immediate positive outcomes. This is best exemplified in bariatric surgery literature, which demonstrates pre-operative weight loss is correlated with reduced operative time, blood loss, complications, liver size, and length of stay, and greater weight loss following surgery (19, 20). There is growing evidence that inpatient weight-management programs are more successful at achieving acute weight loss than outpatient treatments (17, 21, 22). In a 2011, 22-study systematic review, there was a 191% greater reduction in individuals with obesity in pediatric inpatient weight loss programs as compared to outpatient (23). In fact, even short-term inpatient weight loss treatments have been shown to be more effective than long-term outpatient intervention (24). Unfortunately, there is little data on how to incorporate weight-management strategies into inpatient encounters in youth with obesity (19).

Given research and treatment gaps for pediatric inpatient obesity management, we conducted a review of inpatient weight-management treatment in both children and adults. The objective of this article is to describe the existing literature on inpatient weight loss treatments and present examples of acute weight loss in hospitalized pediatric patients that may serve as models for future inpatient weight loss interventions. We report three cases of pediatric patients, with severe obesity affecting their immediate hospitalization, and the weight-management treatment they underwent at a single, urban, quaternary care, children's hospital.

Methods

A search was conducted through the PubMed database focused on non-surgical, inpatient, obesity weight loss treatments. The key words included: “inpatient,” “obesity,” and “intervention.” The search terms were intentionally broad to capture relevant studies while preventing omissions. The search was conducted in March 2022 and included date limits of January 2002 through February 2022. Results were screened to include articles reporting on inpatient weight loss treatments for patients with obesity. The search was not narrowed to pediatric patient populations due to the limited number of articles. Initial search of articles was conducted manually by one reviewer (VG). The database search resulted in an initial pool of 208 articles. Articles in languages other than English, and articles outside the defined time period were removed. All records were then independently reviewed by two reviewers (VG and AV) using the inclusion criteria. Given the relatively small number of search results and nuanced subject focus, all articles were evaluated for inclusion rather than having a separate screening phase. Articles that focused primarily on surgical weight loss treatment for obesity were excluded. Discrepancies were resolved through discussion between investigators. Data foci included: date, country, study design, population, duration, primary outcome(s) with results, and weight loss.

Several patient cases of pediatric, inpatient, weight loss from an urban, freestanding children's hospital caring for diverse communities were closely examined and three cases are presented as examples of this intervention. All presented cases include pediatric patients with severe obesity (120% of the 95th percentile for body mass index) for whom acute weight loss was recommended to either improve current health or better prepare for a specific therapy or treatment.

Results

The review examining inpatient weight loss treatments for patients with obesity found 208 results (Figure 1). Four articles were removed for language (n = 3) and publication date (n = 1). The remaining 204 articles were screened and 171 were secondarily excluded due to wrong primary foci including: bariatric surgery (n = 22), other surgery (n = 17), cardiovascular complications (n = 31), outpatient weight loss (n = 24), hospital costs or complications (n = 7), psychiatric/neurologic focus related to obesity (n = 13), non-specific nutrition and exercise: (n = 10), research design or conference presentation (n = 7), diabetes (n = 10), orthopedics (n = 9), hormones and weight association (n = 7), malnutrition (n = 3), and other (n = 11). 33 studies met full criteria, including 23 pediatric and 10 adult studies. Sample sizes ranged from 1 to 1,862 individuals, with four being the youngest age included. Length of interventions ranged from 7 days to 10 months. Publications included 26 clinical trials, 2 case reports, 2 review articles, 1 prospective intervention study, 1 comparative study, and 1 case series. All studies included males and females, except for 1 adult study and single-patient case reports. Results focused on weight loss, psychologic impacts of weight, quality of life, cognitive functioning, eating behaviors, and biochemical parameters associated with weight loss.

FIGURE 1

Figure 1. Modified PRISMA flow diagram for our literature search results on inpatient, non-surgical, weight loss interventions for adult and pediatric patients.

Few studies discussed the longevity of the interventions more than one year after the interventions or the recidivism rates. One study examined 3 and 5 year follow ups and demonstrated continued reduction of BMI-SDS (by 0.20 and 0.15 respectively) as well as health related behaviors (24).

Pediatric literature review

Among the 23 pediatric studies included (Table 1), the ages ranged from 4 to 19 years. There were 18 clinical trials, 2 case reports, 1 prospective intervention study, 1 comparative study, and 1 case series. All studies showed decreased weight in a portion of participants, as indicated by BMI, weight, BMI SDS, fat mass, and other measures. In addition, 5 studies also reported improved quality of life, 3 reported increased athletic fitness (i.e., athletic competence, aerobic fitness), 6 improved behavioral factors, 2 improved cognitive functioning, and 6 improved biochemical parameters.

TABLE 1

Table 1. Characteristics of pediatric studies meeting inclusion criteria.

Adult literature review

Ten adult studies (18 years and older) were also included (Table 2). There were 8 clinical trials and 2 review articles. Eight of the studies focused on individual weight loss and showed decreased weight. In addition, 5 studies reported improved biochemical parameters, 3 decreased rates of diseases associated with obesity (i.e., hypertension, dyslipidemia), 1 improved mental health, 1 increased fitness, and 2 improved quality of life.

TABLE 2

Table 2. Literature review and study characteristics for adult studies.

Patient cases

We present three cases of youth with severe obesity who were hospitalized for acute medical problems while we simultaneously addressed weight-management. The severity of obesity in these youth was either impacting their present health or ability to undergo certain medical treatments. All three patients were treated following the inpatient obesity treatment roadmap developed at our institution that includes working with nutritionists, obesity medicine specialists (MD/NP), bedside nurses, and physical therapy to create an individualized nutrition, exercise, and anti-obesity medication plan for each patient (Figure 2).

FIGURE 2

Figure 2. Model of inpatient obesity treatment roadmap with collaboration of obesity medicine specialists (MD/NP), nutritionists, nurses, and physical therapists to create individualized nutrition, activity, and medical plans for pediatric patients. BMI, body mass index; CMP, comprehensive metabolic panel; MAOI, monoamine oxidase inhibitors; XR, extended release; AKI, acute kidney injury; MTC, medullary thyroid carcinoma; GI, gastrointestinal.

Case 1

Case 1 is a 16-year-old male who presented with well-controlled type 2 diabetes, obstructive sleep apnea (OSA), severe obesity, and acute onset severe back pain with limited mobility. Initial biochemical evaluation was concerning for acute lymphocytic leukemia (ALL), requiring magnetic resonance imaging (MRI) to determine staging and appropriate treatment. However, due to limitations of the MRI machine at the pediatric center, the patient was unable to obtain imaging secondary to body habitus presenting a significant diagnostic challenge. The obesity medicine team was consulted for assistance with acute weight loss to promote ability for accurate diagnosis, prognosis, and initiation of an appropriate treatment regimen for his oncologic process. The patient was admitted to inpatient rehabilitation for two weeks. On admission, his type 2 diabetes was controlled with insulin and metformin and he had a hgA1c of 6.4. However, due to worsening hepatotoxicity, his Metformin was discontinued. Given his new onset AL.L and concern for chemotherapy induced pancreatitis, the oncology team did not feel comfortable starting a glucagon-like peptide 1 (GLP-1) medication. Interventions included placing the patient on the institutional inpatient obesity protocol including: (1) intake with a registered dietitian; (2) dietary composition: 1,500 calorie per day, less than 150 grams of carbohydrates, no sugar-sweetened beverages, 35 grams of fiber, 32 ounces of water; (3) structured mealtimes (3 meals and 2 snacks); (4) daily physical therapy as tolerated; (5) initiation of weight loss medications (phentermine 15 mg daily). One week after initiation of this protocol, his weight was down trending and he was tolerating phentermine without side effect. Given lack of side effects but increasing hunger with goal of continued weight loss in efforts to obtain an MRI, his phentermine was increased to 37.5 mg daily and dietary program intensified to 1,200 calories and less than 100 grams of carbohydrates daily. At admission, his weight was at 190% BMI_p95 (Figure 3). Upon discharge and after two weeks after initiation of his individualized weight-management plan, it decreased to 175%BMI_p95 and his hgba1c improved to 6.0. He also reported decreased appetite and no side effects throughout his treatment. He continued his outpatient weight-management program with monthly virtual visits with obesity medicine specialists and dietitian. One month after discharge, his %BMI₉₅ had decreased to 165% BMI_p95, and by month six, to 160% BMI_p95 (associated with a total BMI reduction of 4.85 kg/m² and BMI z-score reduction of 0.12 standard deviations).

FIGURE 3

Figure 3. Change in BMI percent of the 95th percentile over time for three pediatric cases of inpatient obesity medical management. T2D, type 2 diabetes; OSA, Obstructive Sleep Apnea; PWS, Prader-Willi Syndrome; BMI, body mass index; Kg/m², kilograms per meter squared; % BMI_p95, BMI percentage of the 95th percentile; pp, percentage points; ΔBMI_p95, change in BMI percentage of the 95th percentile; ΔBMI, change in absolute BMI.

Case 2

Case 2 is a 15-year-old male with Prader-Willi Syndrome, class III obesity, impaired fasting glucose, hypertriglyceridemia, and obstructive sleep apnea (OSA) controlled on continuous positive air pressure (CPAP) admitted for acute respiratory failure and placed on a ventilator. Patient had a history of excessive weight gain due to hyperphagia associated with significant anxiety exacerbated by the Covid-19 pandemic. Outpatient, he was taking Metformin 1,000 mg twice daily and Topiramate 100 mg nightly for off-label weight control. Family had completed three, intensive outpatient lifestyle modifications programs and set up a food safe zone (locked cabinets and food storage units) with limited success. Upon admission, he had a 40-pound gain since his last outpatient encounter four months prior and his respiratory function had worsened significantly in response to this weight gain with blood gases demonstrating carbon dioxide retention levels in the upper 70s. He underwent extensive evaluation for hypertension, cardiac dysfunction, and worsening obstructive sleep apnea and his acutely worsened respiratory status was thought to be largely secondarily to his weight gain. This evaluation included a normal electrocardiogram, echocardiogram and renal ultrasound. He underwent a polysomnography which was abnormal due to breath stacking, hyperventilation, and hypoxemia for which his CPAP machine was adjusted. He also had a number of screening labs during his hospitalization with normal thyroid function (TSH 2.62 uIU/ml, T4 7.5 mcg/dl), free cortisol (0.18), ACTH (21) hgbA1c (5.3%), lipid panel (triglycerides 94, total cholesterol 150). Notably he had low testosterone (Free 2.09 ng/dl, total 83 ng/dl), LH (0.31 mIU/mL), FSH (<0.66 mIU/ml), IGF-1(26 ng/ml) and IGF-BP3 and (0.8 mg/L) ultimately started on 100 mg Testosterone supplementation.

The obesity medicine team was consulted by pulmonology to address diagnostic and treatment challenges by supporting acute weight loss interventions while inpatient. This was in an effort to optimize respiratory control for ability to discharge home. The personalized intervention for this patient included placing him on the institutional inpatient obesity protocol including: (1) intake with a registered dietitian; (2) dietary composition: 800 calories daily, less than 90 grams of carbohydrates, no sugar-sweetened beverages, 35 grams of fiber, 32 ounces of water; (3) structured mealtimes (2 meals and 2 snacks); (4) daily physical therapy as tolerated; (5) optimization of weight loss medication regimen (topiramate increased to 200 mg nightly and initiation of semaglutide 0.25 mg weekly). He remained admitted to the rehabilitation unit for one month, during which, his %BMI_p95 decreased from 313% to 300% BMI_p95 (Figure 3). At the same time, his ventilatory needs decreased with successful transition to continuous positive airway pressure (CPAP) overnight and oxygen by nasal cannula during the day, allowing for safe discharge home. He reported no side effects from the medications during this time period. Given lack of side effects and meeting goal of decreasing respiratory support, no further medication changes were made inpatient. Upon discharge, he was enrolled in the outpatient weight-management program and attended monthly visits with obesity medicine specialists and dietitian. Two and a half months after discharge, his weight had decreased to 297% BMI_p95 (associated with a total BMI reduction of 1.2 kg/m² and BMI z-score reduction of 0.01 standard deviations). His triglycerides and hgba1c were stable at 94 and 5.3% respectively at this time and Testosterone increased with injections.

Case 3

Case 3 is a 6-year-old male with history of a parapharyngeal desmoid tumor resected in June 2019, who had subsequent weight gain of 20 kg over the next two years in association with the Covid-19 pandemic. He was getting serial MRIs with sedation for tumor monitoring, which required admission for respiratory support in the context of his obesity. The obesity medicine team was consulted by oncology and anesthesiology to support acute weight loss interventions while inpatient in an effort to minimize airway risk with his recurrent sedation needs. He was placed on the institutional inpatient obesity protocol including: (1) intake with a registered dietitian; (2) dietary composition: 1,200 calories daily, less than 100 grams of carbohydrates, no sugar-sweetened beverages, 35 grams of fiber, 32 ounces of water; (3) structured mealtimes (3 meals and 2 snacks); and (4) thirty minutes of moderate intensity physical activity daily. One challenge the obesity medicine team faced during the goal of acute weight loss was parental preference not to start anti-obesity medications. He did continue to have normal Hgb A1c (5.1–5.2%) as well as normal lipid panel (triglycerides 74, total cholesterol 161) but elevated alanine aminotransferase and aspartate aminotransferase of 62 and 48 respectively. He remained admitted to the rehabilitation unit for one week with associated weight stabilization. Upon discharge, he was enrolled in the outpatient weight-management program and met with obesity medicine specialists and a dietitian monthly. Five months after discharge, his weight had decreased from 195% BMI_p95 to 175% BMI_p95 (Figure 3).

Discussion

Pediatric obesity affects acute, inpatient management of non-weight related conditions by impeding efficiency of diagnostic work-ups, delaying diagnosis, limiting efficacy of medications, and contributing to longer hospital stays and higher rates of complications (4, 12, 13, 50–54). Despite severe obesity directly impacting patient care, safety, and costs, there is minimal guidance on when or how to intervene for weight-management in the inpatient settings. Overall, studies reveal that nutrition and weight-management protocols or universal counseling are limited while inpatient, even though inpatient treatments are typically most effective, which suggest there is a need and an opportunity to fill this treatment/intervention gap in research and clinical practice (10, 22, 23).

This review highlights the paucity of data available on inpatient weight-management interventions. Two categories of studies came out of this investigation: (1) inpatient admission for the purpose of weight-management (75% of studies included) and (2) weight-management as a component of an inpatient admission for another acute condition. Consistently, studies that compare inpatient vs. outpatient weight-management interventions show greater weight loss in the inpatient arm of the interventions. It is well-reported in the literature that controlled nutrition trials often have greatest success for weight-management across the lifespan, however there are challenges in incorporating those treatment strategies into real-world settings. Despite successes of inpatient weight-management interventions, the labor and cost required to implement them are significant and the disruption to an individual's daily schedule often prevents them from being enacted on a larger scale. However, even when patients are admitted for treatment of other conditions, we can learn from these studies on how to best harness successful treatment strategies and utilize hospitalization time, which creates an opportunity to start weight-management conversations and care (26, 29, 44).

With growing rates of obesity in youth, there is a pressing need to understand how to optimally address obesity within the inpatient setting. Our single center experiences highlight examples of how these needs arise and how there are rarely clear guidelines on how to consider weight-management during hospitalizations. This gap led our team to create a roadmap for addressing pediatric obesity within inpatient settings. Given growing number of multi-disciplinary, pediatric outpatient weight-management programs, there exists an opportunity to learn from these outpatient practices and design protocols supporting youth with obesity, regardless of health system setting– outpatient or inpatient. At our center, this team consists of the following: endocrinology, obesity medicine, nursing, hospital medicine, physical therapy, dietitians, and rehab specialists. To create our protocol, we referenced current clinical practice guidelines for pediatric obesity medicine, and incorporated weight loss medications, prescriptive nutrition, and activity plans focused around a structured-day approach. Each plan is individualized to the youth's medical needs and acute weight loss goals, as determined by primary team. It also incorporates transition plans from inpatient to outpatient settings. Longitudinal controlled trials are required to further investigate how inpatient protocols can be utilized and to determine the most appropriate evidenced-based strategy to support both acute weight loss and maintenance over time (55, 56).

Our case series show that multi-disciplinary execution of an inpatient obesity protocol can result in BMI reduction and support timely diagnostic work-up, safe treatment, and improved outcomes in the short term. Importantly, long term follow up is necessary to ensure continued weight loss or maintenance. All three of our cases demonstrated acute weight-loss allowing for decreased respiratory support needs and/or the ability to obtain important diagnostic imaging. No significant side effects were reported by the individuals. The adolescent patients (Case 1 and Case 2) described gratefulness for the weight loss interventions because it presented them opportunities to take control of an important aspect of their health. The patient in Case 1 reported feeling a lack of control with their new diagnosis of cancer and a relief with this achievable focus of weight loss. The parents of the patient in Case 3 reported appreciation for treating obesity as a medical disease and reducing stigma. Given the hope for longevity with these weight loss interventions, it was important to our team that the patients also felt empowered and had a realistic plan for home after their inpatient hospitalizations.

Limitations

Naturally, this review is not without limitations. First, by including “inpatient,” “obesity,” and “intervention” as our search terms, we may have excluded studies using synonyms. We only searched PubMed, so may have missed articles in other databases, but felt PubMed would be the most comprehensive source of literature relevant to inpatient pediatric obesity interventions. We also excluded non-English literature, while including literature from other countries. Second, the significant differences in methodology and reported data complicate any quantitative comparison across studies. Additionally, few studies report information on non-completers of the interventions or other potential confounding factors, so selection bias may have affected some outcomes. Limitations of our case series include only examining three patients of different ages with varied length of inpatient stays, comorbidities, and medications. Additionally, our patient follow up was confined to 6 months following hospital discharge and it is important to note that weight loss or weight maintenance requires long term follow-up and often individuals may gain weight back. Our focus was on weight loss in the acute setting to assist with specific medical needs including ability to obtain imaging or treat acute illness.

Conclusions

The prevalence of pediatric obesity continues to rise. Obesity impacts acute inpatient management of pediatric conditions by resulting in delays in diagnosis, compromised treatment plans, prolonged lengths of stay, and higher complication rates, which all contribute to increased health care costs and worse outcomes. The limited studies addressing this topic demonstrate that weight-management can and should be considered in an inpatient setting, either as the primary outcome or as an adjunct to other medical treatment. Further investigation is required to design and implement inpatient weight-management protocols for youth with obesity while hospitalized.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author/s.

Ethics statement

Verbal consent and assent from the minor(s)' legal guardian/next of kin was obtained and documented in our medical records for the publication of any potentially identifiable images or data included in this article.

Author contributions

VEG has first authorship, JCE has senior authorship, APV has last authorship. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work. All authors contributed to the article and approved the submitted version.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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