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Title: Does reduced oxygen delivery cause lactic acidosis in falciparum malaria? An observational study
Authors: Hugh W. Kingston
Aniruddha Ghose
Voravut Rungpradubvong
M. Trent Herdman
Katherine Plewes
Haruhiko Ishioka
Stije J. Leopold
Richard J. Maude
Benjamas Intharabut
Sanjib Mohanty
Nicholas P.J. Day
Nicholas J. White
Md Amir Hossain
Nicholas M. Anstey
Arjen M. Dondorp
Ispat General Hospital
Chulalongkorn University
Menzies School of Health Research
King Chulalongkorn Memorial Hospital, Faculty of Medicine Chulalongkorn University
Churchill Hospital
Mahidol University
Chittagong Medical College
Keywords: Immunology and Microbiology;Medicine
Issue Date: 25-Mar-2019
Citation: Malaria Journal. Vol.18, No.1 (2019)
Abstract: © 2019 The Author(s). Background: Lactic acidosis with an elevated lactate-pyruvate ratio suggesting anoxia is a common feature of severe falciparum malaria. High lactate levels are associated with parasitized erythrocyte sequestration in the microcirculation. To assess if there is an additional contribution to hyperlactataemia from relatively inadequate total oxygen delivery, oxygen consumption and delivery were investigated in patients with malaria. Methods: Adult Bangladeshi and Indian patients with uncomplicated (N = 50) or severe (N = 46) falciparum malaria or suspected bacterial sepsis (N = 27) and healthy participants as controls (N = 26) were recruited at Chittagong Medical College Hospital, Chittagong, Bangladesh and Ispat General Hospital, Rourkela, India. Oxygen delivery (DO 2 I) was estimated from pulse oximetry, echocardiographic estimates of cardiac index and haematocrit. Oxygen consumption (VO 2 I) was estimated by expired gas collection. Results: VO 2 I was elevated in uncomplicated median (IQR) 185.1 ml/min/m 2 (135-215.9) and severe malaria 192 ml/min/m 2 (140.7-227.9) relative to healthy persons 107.9 ml/min/m 2 (69.9-138.1) (both p < 0.001). Median DO 2 I was similar in uncomplicated 515 ml/min/m 2 (432-612) and severe 487 ml/min/m 2 (382-601) malaria and healthy persons 503 ml/min/m 2 (447-517) (p = 0.27 and 0.89, respectively). The VO 2 /DO 2 ratio was, therefore, increased by similar amounts in both uncomplicated 0.35 (0.28-0.44) and severe malaria 0.38 (0.29-0.48) relative to healthy participants 0.23 (0.17-0.28) (both p < 0.001). VO 2 I, DO 2 I and VO 2 /DO 2 did not correlate with plasma lactate concentrations in severe malaria. Conclusions: Reduced total oxygen delivery is not a major contributor to lactic acidosis in severe falciparum malaria.
ISSN: 14752875
Appears in Collections:Scopus 2019

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