Global PARITY: Study Design for a Multi-Centered, International Point Prevalence Study to Estimate the Burden of Pediatric Acute Critical Illness in Resource-Limited Settings

Introduction

Over 80 percent of the annual 6.4 million global deaths in children less than 14 years of age occur in low- and middle-income countries (LMICs) with limited resources (1). These deaths are predominantly a result of acute illnesses – sepsis, pneumonia, and trauma – that can be successfully managed with basic, intensive care interventions, such as fluid resuscitation, ventilator support, and transfusion of blood products. Unfortunately, though pediatric acute critical illnesses are the leading causes of death and disability for children outside of the neonatal period globally, acute and critical care services are not universally available in resource-limited settings (RLS) (2–7). A lack of acute and critical care resources is directly associated with worse outcomes, including increased mortality, in children (6–12). Furthermore, this global disparity not only exists with respect to available resources, but also in the availability of data. The true burden and incidence of pediatric acute critical illness is unknown (2, 3, 7, 13–17). Without specific data that captures etiology of acute critical illness and resource utilization in RLS, we cannot develop a contextual framework for appropriate, evidence-based interventions, or appropriately allocate limited but available resources in RLS.

Point prevalence studies are a valuable study design to prospectively gather individual-level data, determine disease prevalence, and measure variability in outcomes and resource utilization across many geographic regions and healthcare settings. Recently, there have been several global point prevalence studies to determine the prevalence of specific pediatric acute critical illnesses: the Pediatric Acute Lung Injury Ventilation (PALIVE) and Pediatric Acute Respiratory Distress Syndrome Incidence and Epidemiology (PARDIE) studies estimated the prevalence of acute pediatric lung injury (10, 15) the International Survey of Critically Ill Children with Acute Neurological Insults (PANGEA) estimated the prevalence of new neurologic injury due to a variety of etiologies (6); and the Sepsis Prevalence, Outcomes, and Therapies (SPROUT) study estimated the prevalence of severe pediatric sepsis (18). While each of these studies contributed significant knowledge about specific critical illnesses, they failed to capture the true global burden of disease and resource utilization within and across LMICs. These studies also required Pediatric Intensive Care Unit (PICU) admission as an inclusion criterion, limiting participation to hospitals with intensive care units. This likely resulted in an underestimation of disease prevalence and mortality in RLS where critical illness is often managed outside of formal intensive care units (2). Additionally, there is significant overlap between illnesses (e.g., pneumonia is a frequent cause of sepsis) and resources required (e.g., mechanical ventilation may be required to support trauma and septic patients) to treat pediatric acute critical illness; therefore, a narrow, disease-specific focus fails to capture both the burden of acute critical illness overall nor does it provide a realistic estimate of resource required to deliver critical care to these patients.

For these reasons the true burden of and outcomes associated with pediatric acute critical illness in RLS have not been previously characterized. As a result, the overall health impact of pediatric acute critical illness in RLS is not known. To better understand the burden of pediatric acute critical illness and associated resource utilization in RLS, we propose the Pediatric Acute cRitical Illness point prevalence sTudY; Global PARITY. The overarching objectives of the study are to 1) engage the global pediatric critical care community to establish baseline frequencies and outcomes of common conditions leading to morbidity and mortality of children in RLS, 2) inform a prospective research agenda to challenge the status quo and discover breakthroughs in care to improve pediatric outcomes globally, and 3) measure the burden of pediatric acute critical illness in RLS. Addressing these data gaps are a crucial first to set future clinical research, health delivery, and resource allocation priorities for RLS globally.

Methods

Study Design and Setting

A prospective, observational, multicenter, multinational point prevalence study will be conducted in resource-limited hospitals in North, Central, and South America, Africa, the Middle East, and South Asia over four sampling time periods to capture seasonal variation. The specific aims of this study are to determine 1) the etiology and prevalence of pediatric acute critical illness among children presenting to participating hospitals in RLS; 2) measure hospital outcomes (mortality, length of stay) in children with acute critical illness in RLS; 3) determine hospital resource utilization by children with acute critical illness; and 4) determine the current resources available to provide acute critical care across RLS.

RLS are characterized by a lack of funds to cover health care costs, resulting in: limited access to medication, equipment, supplies, and devices; less-developed infrastructure; and fewer or less-trained personnel. Resource limitations at each site will be assessed by a separate Hospital Resource Survey (7). Eligible sites will: self-identify as a RLS; be an acute care hospital; provide emergency and inpatient care to a general population of children with acute illnesses (i.e., not a specialty hospital); have a reliable internet connection or cellular service for uploading data; have a member of the local research team who can communicate in and understand English; have an established Institutional Review Board (IRB) or ethical approval process; have previous experience with clinical research and data collection; have the ability to support or apply for support for study-related costs. Hospitals will be recruited via established relationships from the Global Health subgroup of the Pediatric Acute Lung Injury and Sepsis Investigators' (PALISI) Research Network (www.palisiglobalhealth.org), the St. Jude Global Critical Care Program (www.stjude.org/global), and the Red Colaborativa Pediátrica de Latinoamérica (LARed Network). At time of this manuscript, 61 sites from 27countries in 8 regions have committed to participation (Table 1, Figure 1). The study is coordinated by the Department of Pediatrics at the University of Maryland and has been deemed exempt by the University of Maryland Institutional Review Board (IRB, HP-00086107).

TABLE 1

Table 1. Participating sites by country and global PARITY-designated region.

FIGURE 1

Figure 1. World map of participating sites.

All children presenting to the Emergency Department (ED), or equivalent acute hospital receiving unit, or who are directly admitted to a participating site hospital will be screened during a 24-h period on four separate days within four epochs over a 12-month period for inclusion and exclusion criteria. Inclusion criteria will include children aged 29 days to 14 years of age evaluated in the ED for an acute illness or injury or directly admitted to an inpatient unit. Children who are evaluated in the ED and discharged home after evaluation, who die in the ED, or are evaluated and transferred to a higher level of care will be included. This number will serve as the total population (denominator) to calculate the prevalence.

Children presenting for a scheduled follow-up visit, vaccinations, suture removal (or other non-acute complaint), children with a corrected gestational age less than 42 weeks, and children who present to the ED and are pronounced dead on arrival will be excluded. Neonates and infants up to 28 days will not be included in this study as the etiology of critical illness and resource requirements to manage neonates and young infants differs significantly from that of older children. Since the upper age limit of what defines a pediatric patient varies by site and region, 14 years was chosen as the upper limit of age, as patients 14 years and younger are generally considered to be children regardless of setting. All children meeting inclusion criteria and no exclusion criteria will be enrolled. Due to the IRB exempt status, consent is not required.

Patients who are admitted to the hospital (e.g., general pediatric ward, high dependency unit [HDU], or intensive care unit [ICU]) either directly or through the ED will be followed daily for up to 7 days to determine daily resource utilization. Admitted patients will also be followed until the time of discharge, death, transfer or hospital day 30, whichever occurs first, to determine hospital outcomes. These admitted patients will be the numerator to calculate the overall prevalence of hospitalizations.

Data Collection and Management

All data will be collected and managed via REDCap (Research Electronic Data Capture); a secure, web-based application and electronic data capture tool hosted at the University of Maryland (19, 20). No patient-identifying data will be collected. Prior to data collection, a pilot will be conducted at each site to identify challenges in data acquisition and to test study procedures. Study data will be collected using a hospital resource survey, an initial intake survey, a daily resource utilization survey (to be completed daily from the day of presentation up to hospital day seven), and a final outcomes survey (see Supplementary Material). The hospital resource survey is an adapted version of a previously published (7) survey that aims to assess aspects of resource availability, the presence of a basic research infrastructure including ethical and/or IRB approval mechanisms, and the availability of a local site principal investigator (PI). The following data will be collected from the medical record, per exempt status of the IRB, during the study: hospital characteristics including average number of patient encounters and admissions, types of inpatient units, available human resources, available infrastructure including healthcare devices, medications and laboratory resources; patient characteristics including severity of illness, anthropometrics (weight, height, mid-upper arm circumference), comorbidities (HIV status, congenital heart disease, malnutrition), presenting vital signs, routine laboratory test results, imaging results, and the Pediatric Overall Performance Category (POPC) (5) prior to the current illness; hospital resource utilization including use of blood transfusion, fluid bolus, vasoactive agents, non-invasive positive pressure ventilation, oxygen, mechanical ventilation, ICU admission, and antibiotic administration; and outcomes including discharge home, transfer to a higher level of care within the hospital, transfer to another hospital, death, final hospital diagnosis, length of stay, cause of death (if applicable), and the POPC at the time of discharge. For the selected case report forms, see supplements entitled 1) Initial Intake Survey, 2) Daily Assessment Survey, 3) Final Outcomes Survey.

Outcomes

The primary outcome of interest is prevalence of pediatric acute critical illness, defined as death within 48 h of presentation to the hospital, including ED mortality; or admission/transfer to an HDU or ICU; or transfer to another institution for a higher level-of-care; or receiving critical care-level interventions (vasopressor infusion, invasive mechanical ventilation, non-invasive mechanical ventilation) regardless of location in the hospital. Secondary outcomes include etiology of critical illness, in-hospital mortality, cause of death, resource utilization, length of hospital stay, and change in neurocognitive status from premorbid state from admission to discharge POPC.

Statistical Analysis

Data will be analyzed on all subjects who meet inclusion criteria. Descriptive analyses will summarize population-level information. Regression modeling will be used to explore risk factors associated with critical illness (primary outcome), in-hospital mortality, resource utilization, length of hospital stay, and change in neurocognitive status from baseline (secondary outcomes). These analyses will include adjustments for clustering (facility-level, region-level), time-varying variables, and time-invariant variables. Variables will be chosen for evaluation in multivariable models based on their empirical significance in the literature (age, sex, severity of illness, HIV status, anemia, malnutrition) and their performance in univariable models.

Secondary Analyses

Owing to the international and collaborative nature inherent to this study, investigators participating in this study were able to submit proposals for secondary analysis. Proposals for secondary analysis were requested from participating site investigators to query the data generated by Global PARITY to address important questions and gaps not addressed by primary and secondary outcomes of the study. The proposals were reviewed by the Scientific Committee of the Global Health Subgroup; and, a total of 15 proposals were accepted. The list of approved secondary analyses are listed in Table 2.

TABLE 2

Table 2. Global parity secondary analyses.

Discussion

Global PARITY will address the current gap in knowledge regarding the burden of pediatric acute critical illness and hospital resource utilization in RLS. In contrast to previous point prevalence studies estimating the prevalence of specific pediatric critical illnesses (e.g., ARDS, sepsis), Global PARITY aims to measure the burden of all pediatric acute critical illness. Additionally, by expanding the definition of critical illness to include PICU admission, intensive care-level resource utilization, and/or early hospital mortality, the Global PARITY definition is more inclusive and likely to capture critical illness managed in hospitals without formal intensive care units. To our knowledge, this is the first global pediatric point prevalence study to include settings without formal intensive care services and aimed at measuring the prevalence of pediatric critical illness as one entity instead of separate, individual diagnoses.

There are some anticipated limitations to our study. Our study shares limitations common to all point prevalence studies, including inability to account for prehospital mortality or resource utilization. This may result in an underestimation of disease prevalence and resource requirements, especially in those that have a fulminant course or in patients who lack quick access to a hospital setting. Likewise, while the Global PARITY definition of acute critical illness is more inclusive than prior global pediatric point prevalence studies, it has not been previously studied or validated. It is possible that this definition may over or underestimate the true burden of critical illness. However, similar definitions have been used in other multicenter studies (19, 21) in RLS, and we expect to capture the majority of critical illness and associated hospital resource utilization in these patients. Further, while we tried our best to recruit centers from a wide range of countries and regions, we know that there can be disparities within countries based on region, socioeconomic status and type of healthcare facility (such as public vs. private). Thus, our study is still susceptible to selection bias and participating centers may not fully represent the epidemiology of pediatric acute critical illness or resource utilization patterns in a given country or region. Additionally, while we broadened eligible site criteria to include hospitals with or without a formal intensive care unit, the current site requirements (English language, resources, internet connectivity, available Principal Investigator) may still be too burdensome for some sites in RLS to participate. As a result, our study may underestimate the true impact of pediatric acute critical illness, as non-participating sites are likely more resource-limited than those able to meet study criteria. To address this limitation, we are applying for pilot funds to help defer study-related costs at participating sites. We also plan to further explore the reasons site non-participation in future studies. Regardless of these limitations, the results of our study will be the starting point for a generation of urgently need new research and interventional studies.

Global PARITY represents a unique opportunity to engage pediatric clinicians across the world. Only with a large, concerted effort can we, as a global pediatric community, start to understand the spectrum of acute critical illness and its association with childhood morbidity and mortality across resource-variable settings. The results of Global PARITY will inform a prospective, inclusive, global research agenda that includes children around the world, regardless of local resource availability. The data from this study will challenge the status quo and move us toward achieving the long-term goal to develop a body of evidence to support basic, universal, cost-effective critical care interventions appropriate for all settings, especially those with resource limitations. The implementation of such interventions could then be used for targeted capacity-building across resource-limited settings and has the potential to significantly reduce childhood morbidity and mortality due to acute critical illness globally.

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.

Author Contributions

All authors participated in the development, writing, and editing of the manuscript.

Funding

Research effort to create this publication was supported by the National Institute of Allergy and Infectious Diseases of the National Institutes of Health under award number K23AI144029 (TK).

Conflict of Interest

DH is the owner of Analytical Solutions Group, Inc.

The remaining 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.

Acknowledgments

We acknowledge and thank all the participating sites, site principal investigators and their teams.

Supplementary Material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fped.2021.793326/full#supplementary-material

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