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- Dhanani, Jayesh A, et al.
(författare)
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Recovery rates of combination antibiotic therapy using in vitro microdialysis simulating in vivo conditions
- 2018
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Ingår i: Journal of pharmaceutical analysis. - : Elsevier BV. - 2214-0883 .- 2095-1779. ; 8:6, s. 407-412
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Tidskriftsartikel (refereegranskat)abstract
- Microdialysis is a technique used to measure the unbound antibiotic concentration in the interstitial spaces, the target site of action. In vitro recovery studies are essential to calibrating the microdialysis system for in vivo studies. The effect of a combination of antibiotics on recovery into microdialysate requires investigation. In vitro microdialysis recovery studies were conducted on a combination of vancomycin and tobramycin, in a simulated in vivo model. Comparison was made between recoveries for three different concentrations and three different perfusate flow rates. The overall relative recovery for vancomycin was lower than that of tobramycin. For tobramycin, a concentration of 20µg/mL and flow rate of 1.0µL/min had the best recovery. A concentration of 5.0µg/mL and flow rate of 1.0µL/min yielded maximal recovery for vancomycin. Large molecular size and higher protein binding resulted in lower relative recoveries for vancomycin. Perfusate flow rates and drug concentrations affected the relative recovery when a combination of vancomycin and tobramycin was tested. Low perfusate flow rates were associated with higher recovery rates. For combination antibiotic measurement which includes agents that are highly protein bound, in vitro studies performed prior to in vivo studies may ensure the reliable measurement of unbound concentrations.
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| 3. |
- Volkova, Natalia, et al.
(författare)
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Thermally decarboxylated sodium bicarbonate : Interactions with water vapour, calorimetric study
- 2013
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Ingår i: Journal of Pharmaceutical analysis. - : Elsevier. - 2214-0883 .- 2095-1779. ; 3:3, s. 193-199
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Tidskriftsartikel (refereegranskat)abstract
- Isothermal titration calorimetry (ITC) was used to study interactions between water vapour and the surface of thermally converted sodium bicarbonate (NaHCO3). The decarboxylation degree of the samples was varied from 3% to 35% and the humidity range was 54-100%. The obtained enthalpy values were all exothermic and showed a positive linear correlation with decarboxylation degrees for each humidity studied. The critical humidity, 75% (RHo), was determined as the inflection point on a plot of the mean-DeltaH kJ/mole Na2CO3 against RH. Humidities above the critical humidity lead to complete surface dissolution. The water uptake (m) was determined after each calorimetric experiment, complementing the enthalpy data. A mechanism of water vapour interaction with decarboxylated samples, including the formation of trona and Wegscheider's salt on the bicarbonate surface is proposed for humidities below RHo.
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| 6. |
- Berg, Matilda, et al.
(författare)
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The role of knowledge in internet-based cognitive behavioural therapy for adolescent depression : Results from a randomised controlled study
- 2019
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Ingår i: Internet Interventions. - : Elsevier. - 2214-7829. ; 15, s. 10-17
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Tidskriftsartikel (refereegranskat)abstract
- Background and objectivesClients' knowledge about their condition and treatment is considered crucial for general health improvement, and knowledge acquisition is an essential part in internet-based cognitive behavioural therapy (ICBT). Yet, little is known about the role of knowledge and how it influences treatment outcome. This study aimed to examine if explicit knowledgeincreased following ICBT for adolescent depression, if knowledge gainwould be associated with symptom reduction, and if pre-existing knowledge predicted changes in depressive symptoms.MethodsSeventy-one adolescents were randomised to a therapist-supported ICBT or a attention control condition. A measure of depression (BDI-II) and a knowledge test dealing with depression, comorbid anxiety, and its CBT-treatment were administered before and after treatment.ResultsSignificant improvements in knowledge were observed following ICBT compared to the attention control (between-group Cohen's d = 1.25, 95% CI [0.67–1.79]). On average, participants in the treatment group answered 1.4 more questions correctly at post treatment compared to the control group. No relation between change in knowledge and change in depressive symptoms could be observed. Knowledge scores at baseline were high for both groups, with participants answering approximately 75% of the questions correct. A higher level of initial knowledge level predicted poorer treatment response (Parson's r = −0.38, p = .048).ConclusionsThe findings indicate that knowledge about basic concepts and principles about depression, anxiety, and CBT increases following ICBT. This increase in knowledge was not related to change in depressive symptoms, indicating that knowledge is a different construct. The results also suggest that clients who are more knowledgeable prior to treatment might benefit less from ICBT. In sum, the results highlight the need to further examine the role of knowledge in ICBT.
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