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2003 ; 96
(5
): 355-62
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Admission diagnosis of cerebral malaria in adults in an endemic area of Tanzania:
implications and clinical description
#MMPMID12702784
Makani J
; Matuja W
; Liyombo E
; Snow RW
; Marsh K
; Warrell DA
QJM
2003[May]; 96
(5
): 355-62
PMID12702784
show ga
BACKGROUND: Cerebral malaria is commonly diagnosed in adults in endemic areas in
Africa, both in hospitals and in the community. This presents a paradox
inconsistent with the epidemiological understanding that the development of
immunity during childhood confers protection against severe disease in adult
life. AIM: To establish the contribution of Plasmodium falciparum infection in
adults admitted with neurological dysfunction in an endemic area, to assess the
implications of an admission clinical diagnosis of 'cerebral malaria' on the
treatment and clinical outcome, and to describe the clinical features of patients
with malaria parasitaemia. DESIGN: Prospective observational study. METHODS: We
studied adult patients admitted with neurological dysfunction to Muhimbili
National Hospital, Dar-es-Salaam, Tanzania from October 2000 to July 2001. A full
blood count was done and serum creatinine, blood glucose and P. falciparum
parasite load were measured. RESULTS: Of 199 patients (median age 34.6 years),
38% were diagnosed as 'cerebral malaria' on admission, but only 7.5% had
detectable parasitaemia, giving a positive predictive value of 13.3%. Only 1%
fulfilled the WHO criteria for cerebral malaria. The prevalence of parasitaemia
(7.5%) was less than that observed in a group of asymptomatic controls (9.3%),
but distribution of parasite densities was higher in the patients. Mortality was
higher in patients with no parasitaemia (22.3%) than in those with parasitaemia
(13%). DISCUSSION: Cerebral malaria was grossly overdiagnosed, resulting in
unnecessary treatment and insufficient investigation of other possible diagnoses,
which could lead to higher mortality. Extension of this misperception to the
assessment of cause of death in community surveys may lead to an overestimation
of the impact of malaria in adults.
|Adolescent
[MESH]
|Adult
[MESH]
|Aged
[MESH]
|Aged, 80 and over
[MESH]
|Diagnostic Errors/*statistics & numerical data
[MESH]