Pharmacokinetics of Propofol after a Single Dose in Children Aged 1–3 Years with Minor Burns

1996 ◽  
Vol 84 (3) ◽  
pp. 526-532 ◽  
Author(s):  
I. Murat ◽  
V. Billard ◽  
J. Vernois ◽  
M. Zaouter ◽  
P. Marsol ◽  
...  
Keyword(s):  
Single Dose ◽  
Surface Area ◽  
Total Body Surface Area ◽  
Central Compartment ◽  
Pharmacokinetic Parameters ◽  
Systemic Clearance ◽  
Older Children ◽  
Noncompartmental Analysis ◽  
Two Stage ◽  
Stage Analysis

Background No complete pharmacokinetic profile of propofol is yet available in children younger than 3 yr, whereas clinical studies have demonstrated that both induction and maintenance doses of propofol are increased with respect to body weight in this age group compared to older children and adults. This study was therefore undertaken to determine the pharmacokinetics of propofol after administration of a single dose in aged children 1-3 yr requiring anesthesia for dressing change. Methods This study was performed in 12 children admitted to the burn unit and in whom burn surface area was less than or equal to 12% of total body surface area. Exclusion criteria were: unstable hemodynamic condition, inappropriate fluid loading, associated pulmonary injury, or burn injury older than 2 days. Propofol (4 mg.kg(-1))plus fentanyl (2.5 microg.kg(-1)) was administered while the children were bathed and the burn area cleaned during which the children breathed spontaneously a mixture of oxygen and nitrous oxide (50:50). Venous blood samples of 300 microl were obtained at 5, 15, 30, 60, 90, and 120 min, and 3, 4, 8, and 12 thereafter injection; an earlier sample was obtained from 8 of 12 children. The blood concentration curves obtained for individual children were analyzed by three different methods: noncompartmental analysis, mixed effects population model, and standard two-stage analysis. Results Using noncompartmental analysis, total clearance of propofol (+/-SD) was 0.053+/-0.013l.kg(-1).min(-1), volume of distribution at steady state9.5 +/- 3.7l.kg(-1),and residence time 188 +/- 85 min. Propofol pharmacokinetics were best described by a weight-proportional three-compartmental model in both population and two-stage analysis. Estimated and derived pharmacokinetic parameters were similar using these two pharmacokinetic approaches. Results of population versus two-stage analysis are as follow: systemic clearance 0.049 versus 0.048 l.kg(-).min(-1), volume of central compartment 1.03 versus 0.95 l.kg(-1), volume of steady state 8.09 versus 8.17 l.kg(-1). Conclusions The volume of the central compartment and the systemic clearance were both greater than all values reported in older children and adults. This is consistent with the increased propofol requirements for both induction and maintenance of anesthesia in children 1-3 yr. (Key words: Anesthesia: pediatric. Pharmacokinetics: propofol.)

scholarly journals Technical and Medical Aspects of Burn Size Assessment and Documentation

Medicina ◽  
2021 ◽  
Vol 57 (3) ◽  
pp. 242
Author(s):  
Michael Giretzlehner ◽  
Isabell Ganitzer ◽  
Herbert Haller
Keyword(s):  
Surface Area ◽  
Body Surface Area ◽  
Body Surface ◽  
Total Body Surface Area ◽  
Medical Documentation ◽  
Body Parts ◽  
Size Estimation ◽  
Technical Standards ◽  
Burn Treatment ◽  
Adequate Treatment

In burn medicine, the percentage of the burned body surface area (TBSA-B) to the total body surface area (TBSA) is a crucial parameter to ensure adequate treatment and therapy. Inaccurate estimations of the burn extent can lead to wrong medical decisions resulting in considerable consequences for patients. These include, for instance, over-resuscitation, complications due to fluid aggregation from burn edema, or non-optimal distribution of patients. Due to the frequent inaccurate TBSA-B estimation in practice, objective methods allowing for precise assessments are required. Over time, various methods have been established whose development has been influenced by contemporary technical standards. This article provides an overview of the history of burn size estimation and describes existing methods with a critical view of their benefits and limitations. Traditional methods that are still of great practical relevance were developed from the middle of the 20th century. These include the “Lund Browder Chart”, the “Rule of Nines”, and the “Rule of Palms”. These methods have in common that they assume specific values for different body parts’ surface as a proportion of the TBSA. Due to the missing consideration of differences regarding sex, age, weight, height, and body shape, these methods have practical limitations. Due to intensive medical research, it has been possible to develop three-dimensional computer-based systems that consider patients’ body characteristics and allow a very realistic burn size assessment. To ensure high-quality burn treatment, comprehensive documentation of the treatment process, and wound healing is essential. Although traditional paper-based documentation is still used in practice, it no longer meets modern requirements. Instead, adequate documentation is ensured by electronic documentation systems. An illustrative software already being used worldwide is “BurnCase 3D”. It allows for an accurate burn size assessment and a complete medical documentation.

Pediatric Treadmill Friction Burns to the Hand: Outcomes of an Initial Nonoperative Approach

2020 ◽  
Author(s):  
Nikita Batra ◽  
Yinan Zheng ◽  
Emily C Alberto ◽  
Omar Z Ahmed ◽  
Megan Cheng ◽  
...  
Keyword(s):  
Surface Area ◽  
Body Surface Area ◽  
Body Surface ◽  
Cox Regression ◽  
Total Body Surface Area ◽  
Wound Management ◽  
Cox Regression Analysis ◽  
Treatment Type ◽  
Total Body ◽  
Hand Burns

Abstract Treadmill burns that occur from friction mechanism are a common cause of hand burns in children. These burns are deeper and more likely to require surgical intervention compared to hand burns from other mechanisms. The purpose of this study was to identify the factors associated with healing time using an initial nonoperative approach. A retrospective chart review was performed examining children (<15 years) who were treated for treadmill burns to the hand between 2012 and 2019. Patient age, burn depth, total body surface area of the hand injury, and time to healing were recorded. Topical wound management strategies (silver sheet, silver cream, non-silver sheet, and non-silver cream) and associated treatment durations were determined. For patients with burns to bilateral hands, the features, treatment, and outcomes of each hand were assessed separately. Cox regression analysis was used to evaluate the association between time to healing and patient characteristics and treatment type. Seventy-seven patients with 86 hand burns (median age 3 years, range 1–11) had a median total body surface area per hand burn of 0.8% (range 0.1–1.5%). Full-thickness burns (n = 47, 54.7%) were associated with longer time to healing compared to partial-thickness burns (HR 0.28, CI 0.15–0.54, P < .001). Silver sheet treatment was also associated with more rapid time to healing compared to treatment with a silver cream (HR 2.64, CI 1.01–6.89, P = .047). Most pediatric treadmill burns can be managed successfully with a nonoperative approach. More research is needed to confirm the superiority of treatment with silver sheets compared to treatment with silver creams.

EUROPEAN PAEDIATRIC ONCOLOGY OFF-PATENT MEDICINES CONSORTIUM (EPOC): A PHARMACOKINETIC STUDY OF DOXORUBICIN IN CHILDREN WITH CANCER

2015 ◽  
Vol 101 (1) ◽  
pp. e1.6-e1
Author(s):  
Miriam Krischke ◽  
Alan V Boddy ◽  
Georg Hempel ◽  
Swantje Völler ◽  
Nicolas André ◽  
...  
Keyword(s):  
Pharmacokinetic Study ◽  
Cardiac Troponin ◽  
Troponin T ◽  
Paediatric Oncology ◽  
Patient Acceptance ◽  
Pharmacokinetic Parameters ◽  
Blood Levels ◽  
Population Pharmacokinetic ◽  
Older Children ◽  
Treatment Regimens

BackgroundDoxorubicin is a key component of a number of treatment regimens used in paediatric oncology. The pharmacology data on which current dosing regimens are based are very limited.MethodsWe conducted a multicentre, multinational pharmacokinetic study investigating age-dependency in the clearance of doxorubicin in children with solid tumours and leukaemia. Blood samples for measurement of doxorubicin and its metabolite doxorubicinol were collected after 2 administrations, with 5 samples collected in children 3 yrs. A population pharmacokinetic approach was used for analysis, including pharmacogenetic covariates. NT-proBNP and cardiac troponin T were measured to evaluate their role as early indicators of cardiotoxicity.Results101 children could be recruited including 27 patients less than 3 years and among those 5 infants younger than 1 year. Overall, the patient acceptance of the trial was very good.Age dependence of doxorubicin clearance was demonstrated, with children less than 3 years having a lower clearance (21.1±5.8 l/h/m2) than older children (26.6±6.7 l/h/m2) (p=0.0004), after correcting for body weight. Pharmacogenetic variants, including those in transporters and drug metabolizing enzymes, had little influence on pharmacokinetic parameters.Natriuretic peptides plasma levels increased significantly shortly after doxorubicin administration, whereas cardiac troponin levels increased only with the administered cumulative anthracycline dose. Only limited correlation could be observed between their blood levels and doxorubicin pharmacokinetics.ConclusionThe paediatric need concerning missing PK-data could be addressed with limited burden for the patients. Empirically used dose adaptations for infants were found to be justified based on our PK analyses.

scholarly journals In VitroDissolution andIn VivoBioavailability of Six Brands of Ciprofloxacin Tablets Administered in Rabbits and Their Pharmacokinetic Modeling

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Sahar Fahmy ◽  
Eman Abu-Gharbieh
Keyword(s):  
Pharmacokinetic Modeling ◽  
Pharmacokinetic Parameters ◽  
Noncompartmental Analysis ◽  
Dose Oral ◽  
Generic Products ◽  
Ensure Product Quality ◽  
Pharmacopoeial Requirements ◽  
Compartment Open Model

This study was undertaken to assess thein vitrodissolution andin vivobioavailability of six brands of ciprofloxacin oral tablets available in the UAE market using rabbits. Thein vitrodissolution profiles of the six ciprofloxacin products were determined using the USP dissolution paddle method. Pharmacokinetic modeling using compartmental and noncompartmental analysis was done to determine the pharmacokinetic parameters of ciprofloxacin after single-dose oral administration.In vitrorelease study revealed that the amount of ciprofloxacin released in 20 minutes was not less than 80% of the labeled amount which is in accordance with the pharmacopoeial requirements. All tested products are considered to be very rapid dissolving except for formulae A and D. Ciprofloxacin plasma concentration in rabbits was best fitted to a two-compartment open model. The lowest bioavailability was determined to be for product A (93.24%) while the highest bioavailability was determined to be for product E (108.01%). Postmarketing surveillance is very crucial to ensure product quality and eliminating substandard products to be distributed and, consequently, ensure better patient clinical outcome. The tested ciprofloxacin generic products distributed in the UAE market were proven to be of good quality and could be used interchangeably with the branded ciprofloxacin product.

Lack of Effect of Ginkgo biloba on Voriconazole Pharmacokinetics in Chinese Volunteers Identified as CYP2C19 Poor and Extensive Metabolizers

2009 ◽  
Vol 43 (4) ◽  
pp. 726-731 ◽  
Author(s):  
He-Ping Lei ◽  
Guo Wang ◽  
Lian-Sheng Wang ◽  
Dong-sheng Ou-yang ◽  
Hao Chen ◽  
...  
Keyword(s):  
Single Dose ◽  
Ginkgo Biloba ◽  
Poor Metabolizers ◽  
Pharmacokinetic Parameters ◽  
Extensive Metabolizers ◽  
Herbal Supplements ◽  
Time Curve ◽  
Concentration Time ◽  
Apparent Clearance ◽  
Randomized Crossover Study

Background: Ginkgo biloba is one of the most popular herbal supplements in the world. The supplement has been shown to induce the enzymatic activity of CYP2C19, the main cytochrome P450 isozyme involved in voriconazole metabolism. Because this enzyme exhibits genetic polymorphism, the inductive effect was expected to be modulated by the CYP2C19 metabolizer status. Objective: To examine the possible effects of Ginkgo biloba as an inducer of CYP2C19 on single-dose pharmacokinetics of voriconazole in Chinese volunteers genotyped as either CVP2C19 extensive or poor metabolizers. Methods: Fourteen healthy, nonsmoking volunteers–7 CYP2C19 extensive metabolizers (2C19*1/2C19*1) and 7 poor metabolizers (2C19*2/2C19*2)–were selected to participate in this study. Pharmacokinetics of oral voriconazole 200 mg after administration of Ginkgo biloba 120 mg twice daily for 12 days were determined for up to 24 hours by liquid chromatography–electrospray tandem mass spectrometry in a 2-phase randomized crossover study with 4-week washout between phases. Results: For extensive metabolizers, the median value for voriconazole area under the plasma concentration–time curve from zero to infinity (AUC0-00) was 5.17 μg•h/mL after administration of voriconazole alone and 4.28 μg•/mL after voriconazole with Ginkgo biloba (p > 0.05). The other pharmacokinetic parameters of voriconazole such as AUC0-24, time to reach maximum concentration, half-life, and apparent clearance also did not change significantly for extensive metabolizers in the presence of Ginkgo biloba. Pharmacokinetic parameters followed a similar pattern for poor metabolizers. Conclusions: The results suggest that 12 days of treatment with Ginkgo biloba did not significantly alter the single-dose pharmacokinetics of voriconazole in either CYP2C19 extensive or poor metabolizers. Therefore, the pharmacokinetic interactions between voriconazole and Ginkgo biloba may have limited clinical significance.

scholarly journals Variable Absorption of Clavulanic Acid After an Oral Dose of 25 mg/kg of Clavubactin® and Synulox® in Healthy Cats

2002 ◽  
Vol 2 ◽  
pp. 1369-1378 ◽  
Author(s):  
Tom B. Vree ◽  
Eric Dammers ◽  
Eri van Duuren
Keyword(s):  
Single Dose ◽  
Plasma Concentration ◽  
Oral Dose ◽  
Clavulanic Acid ◽  
Phase I Study ◽  
Pharmacokinetic Parameters ◽  
High Efficacy ◽  
Dose Ratio ◽  
Concentration Time ◽  
Crossover Phase

The aims of this investigation were to calculate the pharmacokinetic parameters and to identify parameters, based on individual plasma concentration-time curves of amoxicillin and clavulanic acid in cats, that may govern the observed differences in absorption of both drugs. The evaluation was based on the data from plasma concentration-time curves obtained following a single-dose, open, randomised, two-way crossover phase-I study, each involving 24 female cats treated with two Amoxi-Clav formulations (formulation A was Clavubactin® and formulation was B Synulox® ; 80/20 mg, 24 animals, 48 drug administrations). Plasma amoxicillin and clavulanic acid concentrations were determined using validated bioassay methods. The half-life of elimination of amoxicillin is 1.2 h (t1/2= 1.24 ± 0.28 h, Cmax= 12.8 ± 2.12 μg/ml), and that of clavulanic acid 0.6 h (t1/2= 0.63 ± 0.16 h, Cmax= 4.60 ± 1.68 μg/ml). There is a ninefold variation in the AUCtof clavulanic acid for both formulations, while the AUCtof amoxicillin varies by a factor of two. The highest clavulanic acid AUCtvalues indicate the best absorption; all other data indicate less absorption. Taking into account that the amoxicillin–to–clavulanic acid dose ratio in the two products tested was 4:1, the blood concentration ratios may actually vary much more, apparently without compromising the products’ high efficacy against susceptible microorganisms.

scholarly journals Initial assessment of mortality rates of burn patients in a tertiary care hospital by total body surface area, depth and facial burns, and its correlation with serial total leucocyte count

2020 ◽  
Vol 7 (10) ◽  
pp. 3280
Author(s):  
Kavitha Jayanthi Balachandran ◽  
Manoj Kumar Nirmalanandan
Keyword(s):  
Surface Area ◽  
Body Surface ◽  
Leucocyte Count ◽  
Total Body Surface Area ◽  
Total Leucocyte Count ◽  
Burn Victims ◽  
Facial Burns ◽  
Inhalational Injury ◽  
Total Body ◽  
Wbc Count

Background: The pattern of burns in victims varies with the manner of infliction of burns. Age plays an important role in deciding the mortality and morbidity of burn victims. Other factors that decide the prognosis of burn victims are the total body surface area (TBSA), Depth of burns, and inhalational injury as evidenced by facial burns. Assessment of these epidemiological factors and inhalational injury can be done as a part of the initial evaluation. Such an assessment aid in resuscitation including emergent airway and decision making regarding the need for skin grafts or escharotomy. Serial measurement of total leucocyte count also helps in identifying the onset of infection and progress to septicaemia and increased mortality rates.Methods: As a part of the initial evaluation, we attempt to study the relation between TBSA, Depth of burns, facial burns, and total WBC count with mortality. A background of septicaemia was also noticed in the majority of patients.Results: For analysis, patients were divided into two groups- Survivors and Non-survivors. A fall in total WBC count coincided with the onset of sepsis and mortality. The other three factors also had a direct correlation with mortality rates.Conclusions: A scoring system constituting all the factors is essential as an initial diagnostic step and it will help in deciding early intubation, escharotomy, and aggressive fluid resuscitation.

scholarly journals The validation study on a three-dimensional burn estimation smart-phone application: accurate, free and fast?

2018 ◽  
Vol 6 ◽  
Author(s):  
A. K. W. Cheah ◽  
T. Kangkorn ◽  
E. H. Tan ◽  
M. L. Loo ◽  
S. J. Chong
Keyword(s):  
Surface Area ◽  
Body Surface Area ◽  
Body Surface ◽  
Validation Study ◽  
Total Body Surface Area ◽  
Three Dimensional ◽  
Smart Phone ◽  
Conventional Methods ◽  
Total Body ◽  
Smart Phone Application

Abstract Background Accurate total body surface area burned (TBSAB) estimation is a crucial aspect of early burn management. It helps guide resuscitation and is essential in the calculation of fluid requirements. Conventional methods of estimation can often lead to large discrepancies in burn percentage estimation. We aim to compare a new method of TBSAB estimation using a three-dimensional smart-phone application named 3D Burn Resuscitation (3D Burn) against conventional methods of estimation—Rule of Palm, Rule of Nines and the Lund and Browder chart. Methods Three volunteer subjects were moulaged with simulated burn injuries of 25%, 30% and 35% total body surface area (TBSA), respectively. Various healthcare workers were invited to use both the 3D Burn application as well as the conventional methods stated above to estimate the volunteer subjects’ burn percentages. Results Collective relative estimations across the groups showed that when used, the Rule of Palm, Rule of Nines and the Lund and Browder chart all over-estimated burns area by an average of 10.6%, 19.7%, and 8.3% TBSA, respectively, while the 3D Burn application under-estimated burns by an average of 1.9%. There was a statistically significant difference between the 3D Burn application estimations versus all three other modalities (p < 0.05). Time of using the application was found to be significantly longer than traditional methods of estimation. Conclusions The 3D Burn application, although slower, allowed more accurate TBSAB measurements when compared to conventional methods. The validation study has shown that the 3D Burn application is useful in improving the accuracy of TBSAB measurement. Further studies are warranted, and there are plans to repeat the above study in a different centre overseas as part of a multi-centre study, with a view of progressing to a prospective study that compares the accuracy of the 3D Burn application against conventional methods on actual burn patients.

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