ABSTRACT
BACKGROUND: Impaired microvascular perfusion is central to the development of coma and lactic acidosis in severe falciparum malaria. Refractory hypotension is rare on admission but develops frequently in fatal cases. We assessed cardiac function and volume status in severe falciparum malaria and its prognostic significance. METHODS: Patients with severe (N = 101) or acute uncomplicated falciparum malaria (N = 83) were recruited from 2 hospitals in India and Bangladesh, and healthy participants (N = 44) underwent echocardiography. RESULTS: Patients with severe malaria had 38% shorter left ventricular (LV) filling times and 25% shorter LV ejection times than healthy participants because of tachycardia; however, stroke volume, LV internal diameter in diastole (LVIDd), and LV internal diameter in systole (LVIDs) indices were similar. A low endocardial fraction shortening (eFS) was present in 17% (9 of 52) of severe malaria patients. Adjusting for preload and afterload, eFS was similar in health and severe malaria. Fatal cases had smaller baseline LVIDd and LVIDs indices, more collapsible inferior vena cavae (IVC), and higher heart rates than survivors. The LVIDs and IVC collapsibility were independent predictors for mortality, together with base excess and Glasgow Coma Scale. CONCLUSIONS: Patients with severe malaria have rapid ejection of a normal stroke volume. Fatal cases had features of relative hypovolemia and reduced cardiac index reserve.
Subject(s)
Hypovolemia/parasitology , Malaria, Falciparum/physiopathology , Ventricular Dysfunction, Left/diagnostic imaging , Adult , Bangladesh , Case-Control Studies , Echocardiography , Female , Hemodynamics , Humans , Hypovolemia/physiopathology , India , Linear Models , Logistic Models , Malaria, Falciparum/diagnostic imaging , Malaria, Falciparum/mortality , Male , Middle Aged , Multivariate Analysis , Ventricular Dysfunction, Left/parasitology , Ventricular Function, Left , Young AdultABSTRACT
Symptomatic severe malarial anaemia (SMA) has a high fatality rate of 30-40%; most deaths occur in children awaiting blood transfusion. Blood transfusion services in most of Africa are not capable of delivering adequate supplies of safe blood in a timely manner to critically ill children with SMA. Contrary to widely held belief, hypovolaemia, rather than heart failure, has emerged as a common complication in such children. We examined the safety of pre-transfusion management (PTM) by volume expansion, aimed at stabilizing children and obviating the urgency for blood transfusion. Kenyan children with severe falciparum anaemia (haemoglobin <5 g/dl) and respiratory distress were randomly assigned to 20 ml/kg of 4.5% albumin or 0.9% saline or maintenance only (control) while awaiting blood transfusion. PTM was apparently safe since it did not lead to the development of pulmonary oedema or other adverse events. There was no significant difference in the primary outcome [mean percentage reduction in base excess between admission and 8 h (95% confidence interval)] between the control group 42% (19-66%) albumin group 44% (32-57%) and saline group 36% (16-57%); adjusted analysis of variance F=0.31, P=0.7. However, the number of children requiring emergency interventions was significantly greater in the control group, four of 18 (22%) than the saline group 0 of 20 (P=0.03). We have established the safety of this PTM in children with SMA whilst awaiting blood transfusion at a hospital with an adequate blood-banking program. The impact on mortality should be assessed where blood transfusion services are unable to supply emergency transfusions.
