Open Access Research article

Exploring mechanisms of excess mortality with early fluid resuscitation: insights from the FEAST trial

Kathryn Maitland12*, Elizabeth C George3, Jennifer A Evans4, Sarah Kiguli5, Peter Olupot-Olupot6, Samuel O Akech2, Robert O Opoka5, Charles Engoru7, Richard Nyeko8, George Mtove9, Hugh Reyburn109, Bernadette Brent12, Julius Nteziyaremye6, Ayub Mpoya2, Natalie Prevatt1, Cornelius M Dambisya6, Daniel Semakula5, Ahmed Ddungu5, Vicent Okuuny7, Ronald Wokulira7, Molline Timbwa2, Benedict Otii8, Michael Levin1, Jane Crawley3, Abdel G Babiker3, Diana M Gibb3 and for the FEAST trial group

Author affiliations

1 Wellcome Trust Centre for Clinical Tropical Medicine, Department of Paediatrics, Faculty of Medicine, St Marys Campus, Norfolk Place, Imperial College, London W2 1PG, UK

2 Kilifi Clinical Trials Facility, KEMRI-Wellcome Trust Research Programme, PO Box 230, Kilifi, Kenya

3 Medical Research Council (MRC) Clinical Trials Unit, Aviation House, 125 Kingsway London, WC2B 6NH, UK

4 Department of Paediatrics University Hospital of Wales Heath Park, Cardiff, CF14 4XW, Wales, UK

5 Department of Paediatrics, Mulago Hospital, PO Box 7070, Makerere University, Kampala, Uganda

6 Department of Paediatrics, Mbale Regional Referral Hospital Pallisa Road Zone, PO Box 921, Mbale, Uganda

7 Department of Paediatrics, Soroti Regional Referral Hospital, PO Box 289, Soroti, Uganda

8 Department of Paediatrics, St Mary's Hospital, PO Box 180, Lacor, Uganda

9 Department of Paediatrics Joint Malaria Programme, Teule Hospital, PO Box 81, Muheza, Tanzania

10 Joint Malaria Programme, PO Box 2228, KCMC, Moshi, Tanzania

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Citation and License

BMC Medicine 2013, 11:68  doi:10.1186/1741-7015-11-68


See related article: http://www.biomedcentral.com/1741-7015/11/67

Published: 14 March 2013

Abstract

Background

Early rapid fluid resuscitation (boluses) in African children with severe febrile illnesses increases the 48-hour mortality by 3.3% compared with controls (no bolus). We explored the effect of boluses on 48-hour all-cause mortality by clinical presentation at enrolment, hemodynamic changes over the first hour, and on different modes of death, according to terminal clinical events. We hypothesize that boluses may cause excess deaths from neurological or respiratory events relating to fluid overload.

Methods

Pre-defined presentation syndromes (PS; severe acidosis or severe shock, respiratory, neurological) and predominant terminal clinical events (cardiovascular collapse, respiratory, neurological) were described by randomized arm (bolus versus control) in 3,141 severely ill febrile children with shock enrolled in the Fluid Expansion as Supportive Therapy (FEAST) trial. Landmark analyses were used to compare early mortality in treatment groups, conditional on changes in shock and hypoxia parameters. Competing risks methods were used to estimate cumulative incidence curves and sub-hazard ratios to compare treatment groups in terms of terminal clinical events.

Results

Of 2,396 out of 3,141 (76%) classifiable participants, 1,647 (69%) had a severe metabolic acidosis or severe shock PS, 625 (26%) had a respiratory PS and 976 (41%) had a neurological PS, either alone or in combination. Mortality was greatest among children fulfilling criteria for all three PS (28% bolus, 21% control) and lowest for lone respiratory (2% bolus, 5% control) or neurological (3% bolus, 0% control) presentations. Excess mortality in bolus arms versus control was apparent for all three PS, including all their component features. By one hour, shock had resolved (responders) more frequently in bolus versus control groups (43% versus 32%, P <0.001), but excess mortality with boluses was evident in responders (relative risk 1.98, 95% confidence interval 0.94 to 4.17, P = 0.06) and 'non-responders' (relative risk 1.67, 95% confidence interval 1.23 to 2.28, P = 0.001), with no evidence of heterogeneity (P = 0.68). The major difference between bolus and control arms was the higher proportion of cardiogenic or shock terminal clinical events in bolus arms (n = 123; 4.6% versus 2.6%, P = 0.008) rather than respiratory (n = 61; 2.2% versus 1.3%, P = 0.09) or neurological (n = 63, 2.1% versus 1.8%, P = 0.6) terminal clinical events.

Conclusions

Excess mortality from boluses occurred in all subgroups of children. Contrary to expectation, cardiovascular collapse rather than fluid overload appeared to contribute most to excess deaths with rapid fluid resuscitation. These results should prompt a re-evaluation of evidence on fluid resuscitation for shock and a re-appraisal of the rate, composition and volume of resuscitation fluids.

Trial registration

ISRCTN69856593

Keywords:
Africa; children; clinical trial; fluid resuscitation; human albumin solution; mortality; saline; shock; terminal clinical events