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Pharmacokinetics and anticonvulsant effects of diazepam in children with severe falciparum malaria and convulsions

Ogutu, B. R., Newton, Crjc, Crawley, J., Muchohi, S. N., Otieno, G. O., Edwards, Geoffrey, Marsh, Kevin and Kokwaro, G. O. (2002) 'Pharmacokinetics and anticonvulsant effects of diazepam in children with severe falciparum malaria and convulsions'. British Journal of Clinical Pharmacology, Vol 53, Issue 1, pp. 49-57.

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Abstract

Aims Convulsions are a common complication of severe malaria in children and are associated with poor outcome. Diazepam is used to terminate convulsions but its pharmacokinetics and pharmacodynamics have not been studied in this group. Accordingly, we carried out a comparative study of the pharmacokinetics of intravenous (i.v.) and rectal (p.r.) diazepam. Methods Twenty-five children with severe malaria and a convulsion lasting > 5 min were studied. Sixteen children received diazepam intravenously (i.v.; 0.3 mg kg(-1)) and nine rectally (p.r.; 0.5 mg kg(-1)). Plasma diazepam concentrations were measured by reversed phase high-performance liquid chromatography. The duration of convulsions, depth of coma, respiratory and cardiovascular parameters were monitored. Results Median maximum plasma diazepam concentrations of 634 (range 402-1507) ng ml(-1) and 423 (range 112-1953) ng ml(-1) were achieved at 5 and 25 min following i.v. and p.r. administration, respectively. All patients except three (one i.v. and two p.r.) achieved plasma diazepam concentration > 200 ng ml(-1) within 5 min. Following p.r. administration, plasma diazepam concentrations were more variable than i.v. administration. A single dose of i.v. diazepam terminated convulsions in all children but in only 6/9 after p.r. administration. However, nine children treated with i.v. and all those treated with p.r. diazepam had a recurrence of convulsions occurring at median plasma diazepam concentrations of 157 (range: 67-169) and 172 (range: 74-393) tag ml(-1), respectively. All the children in the i.v. and four in the PR diazepam group who had recurrence of convulsions required treatment. None of the children developed respiratory depression or hypotension. Conclusions Administration of diazepam i.v. or p.r. resulted in achievement of therapeutic concentrations of diazepam rapidly, without significant cardio-respiratory adverse effects. However, following p.r. administration, diazepam did not terminate all convulsions and plasma drug concentrations were more variable.

Item Type: Article
Subjects: QV Pharmacology > QV 38 Drug action.
QX Parasitology > Protozoa > QX 135 Plasmodia
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 750 Malaria
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 770 Therapy
WS Pediatrics > Diseases of Children and Adolescents > By System > WS 300 Hemic and lymphatic system
Faculty: Department: Groups (2002 - 2012) > Molecular & Biochemical Parasitology Group
Digital Object Identifer (DOI): https://doi.org/10.1046/j.0306-5251.2001.01529.x
Depositing User: Martin Chapman
Date Deposited: 29 Oct 2013 14:44
Last Modified: 06 Feb 2018 13:05
URI: https://archive.lstmed.ac.uk/id/eprint/2970

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