The Childhood Acute Illness and Nutrition (CHAIN) network nested case-cohort study protocol: a multi-omics approach to understanding mortality among children in sub-Saharan Africa and South Asia

Introduction: Many acutely ill children in low- and middle-income settings have a high risk of mortality both during and after hospitalisation despite guideline-based care. Understanding the biological mechanisms underpinning mortality may suggest optimal pathways to target for interventions to further reduce mortality. The Childhood Acute Illness and Nutrition (CHAIN) Network ( www.chainnnetwork.org) Nested Case-Cohort Study (CNCC) aims to investigate biological mechanisms leading to inpatient and post-discharge mortality through an integrated multi-omic approach. Methods and analysis; The CNCC comprises a subset of participants from the CHAIN cohort (1278/3101 hospitalised participants, including 350 children who died and 658 survivors, and 270/1140 well community children of similar age and household location) from nine sites in six countries across sub-Saharan Africa and South Asia. Systemic proteome, metabolome, lipidome, lipopolysaccharides, haemoglobin variants, toxins, pathogens, intestinal microbiome and biomarkers of enteropathy will be determined. Computational systems biology analysis will include machine learning and multivariate predictive modelling with stacked generalization approaches accounting for the different characteristics of each biological modality. This systems approach is anticipated to yield mechanistic insights, show interactions and behaviours of the components of biological entities, and help develop interventions to reduce mortality among acutely ill children. Ethics and dissemination. The CHAIN Network cohort and CNCC was approved by institutional review boards of all partner sites. Results will be published in open access, peer reviewed scientific journals and presented to academic and policy stakeholders. Data will be made publicly available, including uploading to recognised omics databases. Trial registration NCT03208725.

The Childhood Acute Illness and Nutrition (CHAIN) network nested case-cohort study protocol: a multi-omics approach to understanding mortality among children in sub-Saharan Africa and South Asia

Introduction: Many acutely ill children in low- and middle-income settings have a high risk of mortality both during and after hospitalisation despite guideline-based care. Understanding the biological mechanisms underpinning mortality may suggest optimal pathways to target for interventions to further reduce mortality. The Childhood Acute Illness and Nutrition (CHAIN) Network ( www.chainnnetwork.org) Nested Case-Cohort Study (CNCC) aims to investigate biological mechanisms leading to inpatient and post-discharge mortality through an integrated multi-omic approach. Methods and analysis; The CNCC comprises a subset of participants from the CHAIN cohort (1278/3101 hospitalised participants, including 350 children who died and 658 survivors, and 270/1140 well community children of similar age and household location) from nine sites in six countries across sub-Saharan Africa and South Asia. Systemic proteome, metabolome, lipidome, lipopolysaccharides, haemoglobin variants, toxins, pathogens, intestinal microbiome and biomarkers of enteropathy will be determined. Computational systems biology analysis will include machine learning and multivariate predictive modelling with stacked generalization approaches accounting for the different characteristics of each biological modality. This systems approach is anticipated to yield mechanistic insights, show interactions and behaviours of the components of biological entities, and help develop interventions to reduce mortality among acutely ill children. Ethics and dissemination. The CHAIN Network cohort and CNCC was approved by institutional review boards of all partner sites. Results will be published in open access, peer reviewed scientific journals and presented to academic and policy stakeholders. Data will be made publicly available, including uploading to recognised omics databases. Trial registration NCT03208725.

Enteric Function as a Determinant of Nutritional and Clinical Recovery from Acute Illness Among Children in Kenya and Pakistan

Objectives

In low- and middle-income countries (LMICs), acutely ill undernourished children remain at high risk of mortality for months following discharge from hospital. Community-based studies suggest that enteric dysfunction (ED), including permeability and impaired absorption, is associated with poor outcomes. We used the lactulose rhamnose ratio (L: R) test, which provides a functional assessment of gut integrity, to determine if ED influences clinical and nutritional recovery in the post-discharge period.

Methods

Children aged 2–24 months without diarrhea were recruited from Civil Hospital Karachi, Pakistan and Migori County Referral Hospital, Kenya. L: R tests were administered after children were clinically stable (oral feeds, not dehydrated, no oxygen needs) and pre-discharge. Similarly aged children were pseudo-randomly selected from homes near those of children being discharged and were also tested. Prior to administration of sugars, urine was collected to detect background levels, followed by a two-hour collection. Samples were analyzed by high-performance chromatography mass spectroscopy. Crude L: R distributions were compared using the Mann-Whitney test. A priori determined confounders (age, mid-upper arm circumference [MUAC], HIV status, site) were adjusted for in linear regression of log-transformed L: R.

Results

156 hospitalized and 91 community children were recruited. Median age was nine months in each group. Hospitalized children had lower median MUAC (12.4 vs 13.5 cm) and higher HIV infection prevalence (5% vs 1%). Both sugars were largely undetectable in pre-dose samples. Urinary median L: R among children being discharged (0.36 (interquartile range [IQR] 0.20–0.87)) was significantly higher compared to community peers (0.30 (IQR: 0.17–0.48, P = 0.038)). This difference remained significant in the adjusted model (p: 0.008).

Conclusions

Children at discharge from hospital in LMICs appear to have worse enteric function than community peers, and this difference does not appear to be attributable to young age or nutritional or HIV status. This analysis will be expanded to include L: R association with mortality, morbidity and growth outcomes prior to the conference.

Funding Sources

Thrasher Research Foundation 14,466, the Bill & Melinda Gates Foundation OPP 1,131,320.

Developing Caregiver Led mHealth Solutions for Screening and Managing Childhood Wasting in the Mama Aweza Trial in Kenya

Objectives

Globally, only 17% of children with wasting receive treatment. In Kenya, 4% of the 7 million children under-5 years of age are wasted and 26% are stunted. The Mama Aweza trial will test whether a two-way short message service (SMS) mobile health system, the Maternal Administered Malnutrition Monitoring System (MAMMS), can increase the coverage of malnutrition management programs in low-and-middle income countries.

Methods

Five formative focus group discussions (FGDs) were conducted with caregivers at an immunization clinic in Migori County, Kenya to inform feasibility and content of SMS messages in the MAMMS system. Caregivers were asked to explain anticipated facilitators and barriers to participation in a SMS program to facilitate home-based mid upper-arm circumference (MUAC) monitoring. FGDs also reviewed educational messages that accompany weekly SMS reminders to measure and report their child's MUAC. The feedback from these FGDs was included in the clinical trial, which begun in August 2019.

Results

The most anticipated challenge to responding to weekly messages was the use of a shared phone particularly that the SMS would be deleted or the caregiver would not be informed of the message. The greatest anticipated challenge for sending messages was and not knowing how to send a SMS. Overall, 52 messages were written on the following topics: developmental milestones, encouragement, fever, diarrhea, malaria, ear infections, sanitation and hygiene, vaccinations, respiratory illness, and kitchen gardening. To date, 144 mother-infant dyads have been enrolled and 77 randomly assigned to the MAMMS arm. Sixty-nine (90%) caregivers have responded to ≥1 message and 503 (68%) of 742 automated messages have received a response. At enrollment, 21 (27%) of caregivers in the MAMMS arm reported a shared phone, with no current evidence that caregivers sharing a phone respond less than those with their own phone.

Conclusions

Caregivers found SMS-based malnutrition screening to be acceptable and engaging. In regions with high literacy and high mobile phone ownership, such as Kenya, SMS supported home MUAC monitoring may improve malnutrition screening coverage and lead to earlier identification and treatment.

Funding Sources

Thrasher Research Foundation 14,656.