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  • 1
    ISSN: 1432-1041
    Keywords: Key words Cytochrome P450 IIIA ; Maturation ; Neonates; drug metabolism ; 6 βOHF/FF ratio ; infants ; CYP IIIA7 ; CYP IIIA3/4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: Cytochrome P450 III (CYP III) has previously been demonstrated in vitro in fetal liver. Methods: A study was performed in 7 premature, 13 term neonates and 30 infants to assess whether or not maturation had any influence on CYP IIIA activity in children from birth to 1 year of age. A simple non invasive procedure was used (6 βOHF/FF concentration ratio in a morning spot urine sample). Results: The 6 βOHF/FF ratio was 7.2, 7.9 and 5.0 in premature and term neonates and infants, respectively. CYP IIIA activity is present at birth, with a 6 βOHF/FF ratio comparable to adults. Its activity seemed lower in infants. This might be due to the decrease in CYP IIIA7 activity during maturation after birth, which might be more rapid than the increase in CYP IIIA3/4 activity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1041
    Keywords: Key words Drug utilization ; Aspirin ; Paracetamol ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: Antipyretic/analgesic drugs (AADs) are among the most commonly used drugs in children. Their efficacy and adverse effects have often been debated and new AADs have been introduced over the past few years. The aim of this study was to assess the characteristics of the use of AADs in children in France, and their trends. Methods: Two surveys on household health care consumption were undertaken in France, in 1981 and in 1992. They included 5060 and 4841 children, respectively. The AADs studied were aspirin, paracetamol and non-steroidal anti-inflammatory drugs (NSAIDs). Results: The proportion of children exposed to AADs increased significantly between 1981 and 1992 (+28% in 11 years). Among them, the percentage of subjects treated with aspirin decreased (−27%). In contrast, the percentage increased for paracetamol (+19%) and for NSAIDs (+179%). Aspirin was the AAD most used in 1981 (57.4%) and it was replaced by paracetamol in 1992 (71.6%). Nasopharyngitis was the main reason for AAD prescription under the age of 11 years; for older children it was influenza-like syndrome, irrespective of the study year. A change in AAD choice occurred in nasopharyngitis, acute bronchitis and influenza-like syndrome irrespective of the age group, and in otitis/sinusitis between 4 and 10 years. In all these cases aspirin prescription decreased, in contrast with paracetamol and NSAIDs. Self-medication of AAD was uncommon (8.3% for aspirin and 10.3% for paracetamol in 1992) and decreased (−29% and −33%). It was used principally for nasopharyngitis, influenza-like syndrome and pain. Conclusion: The consumption of AADs in children is high and is increasing. Paracetamol and NSAIDs tend to replace aspirin prescription in children and physicians have played the main role in this change.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1041
    Keywords: Key words Diphemanil methylsulphate ; Neonate; antimuscarinic agent ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1041
    Keywords: Key words Stiripentol ; Carbamazepine ; Epilepsia; drug metabolism ; antiepileptic drugs ; children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: To study the relationship between the plasma concentration of stiripentol (STP), a new antiepileptic drug, and its inhibitory effect on the formation of carbamazepine epoxide (CBZE) in epileptic children treated with carbamazepine (CBZ) either alone or in combination with another antiepileptic drug. Methods: Minimum plasma concentration of antiepileptic drugs was measured before initiation of STP therapy (day 0) and on days 28 (STP 60 mg⋅kg−1⋅day−1) and 84 (STP 90 mg⋅kg−1⋅day−1) by HPLC. Results: The CBZE/CBZ plasma concentration ratio decreased exponentially with increasing minimum plasma STP concentration (r = 0.80). The asymptote of the curve allowed the calculation of the minimum plasma STP concentration required to obtain the maximum inhibitory effect, i.e. 6.7 mg⋅l−1. Conclusion: The inhibitory effect of STP on CBZ metabolism expressed as the CBZE/CBZ plasma concentration ratio is dependent on STP plasma concentration, with a maximum effect at an average of 7 mg⋅l−1. The present data suggest that in order to evaluate the anticonvulsant efficacy of STP as add-on therapy, the minimum plasma STP concentration should be maintained above 7 mg⋅l−1 and the dosage of CBZ should simultaneously be decreased in steps by more than 50% to minimize the change in CBZ plasma concentration.
    Type of Medium: Electronic Resource
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