Publications by authors named "V Helfer"

Article Synopsis
  • Gram-negative bacteria like Pseudomonas aeruginosa and Klebsiella pneumoniae release endotoxins that affect how antibiotics like ciprofloxacin penetrate lung tissue during infections.
  • A study using a population pharmacokinetic model found that chronic lung infections significantly reduce ciprofloxacin levels in infected rats compared to healthy ones, with reductions of 46.8% for P. aeruginosa and 68.4% for K. pneumoniae.
  • Although the antibiotic dosage is effective in achieving plasma targets necessary for treatment, the compromised lung exposure to ciprofloxacin highlights a need for further clinical investigation into optimizing treatment for chronic pneumonia infections caused by these bacteria.
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This is the first systematic review and meta-analysis of blue carbon stocks in Brazilian mangroves. We evaluated the effect of characteristics and site status (impacted versus non-impacted) on carbon stocks found in the various compartments on total ecosystem carbon stock (TECS). TECS followed an inverse trend with the latitudinal position: the highest values were found on the North coast (mean 511 Mg C ha), followed by the Northeast and Southeast.

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Pediatric obesity is a growing health concern, affecting millions of children worldwide. While pharmacokinetic (PK) changes in numerous commonly prescribed medications have been linked to obesity, the physiological mechanisms driving these alterations and their implications for drug dosing remain poorly understood. The objective of this study was to evaluate previously reported observations of reduced pantoprazole clearance (CL) in children with obesity, investigate obesity-related characteristics in liver physiology as explanatory causes for these observations, and evaluate the clinical relevance of obesity on drug dosing.

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Mangrove trees occur in a variety of geomorphic and sedimentary settings. Yet, studies investigating their role as habitat providers often focus on the most common biophysical types, such as deltaic, estuarine, open coast or lagoonal mangroves on soft sediments, disregarding less typical environments. Here, we investigated the influence of individual mangrove trees growing on a consolidated backreef system (Laucala Bay, Fiji) on habitat use by reef fishes.

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Background And Objective: Pediatric dosing of enoxaparin was derived based on extrapolation of the adult therapeutic range to children. However, a large fraction of children do not achieve therapeutic anticoagulation with initial dosing. We aim to use real-world anti-Xa data obtained from children receiving enoxaparin per standard of care to characterize the population pharmacokinetics (PopPK).

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