Determination of pharmacokinetic-pharmacodynamic cutoff values of oxytetracycline in calves and adult cattle using population pharmacokinetic modeling.

Introduction: A harmonized clinical breakpoint for interpreting antimicrobial susceptibility testing of oxytetracycline in cattle is currently lacking in Europe. This study aimed to establish a pharmacokinetic/pharmacodynamic (PK/PD) cutoff to propose clinical breakpoints, facilitating reliable interpretation of antimicrobial susceptibility results in cattle.

Methods: A meta-analysis of oxytetracycline pharmacokinetic data from 69 cattle was conducted, including 1,730 plasma concentration samples from animals administered 20 mg/kg intramuscularly and/or 20 or 40 mg/kg intravenously.

Pragmatic Systemic Solutions to the Wicked and Persistent Problem of the Unprofessional Disruptive Physician in the Health System.

We have always had and will always have "disruptive" or "dysfunctional" doctors behaving unprofessionally within healthcare institutions. Disruptive physician behaviour (also called "unprofessional behaviour") was described almost 150 years ago, but remains a persistent, wicked problem in healthcare, largely fuelled by systemic inaction. In this Commentary, we aim to explore the following aspects from a systemic lens: (i) the gaps in understanding systemic resistance and difficulty in addressing this issue; and (ii) pragmatic approaches to its management in the healthcare system.

Biased computation of probability of target attainment for antimicrobial drugs.

The medical literature is replete with articles in which there is confusion between "free concentration" and "unbound fraction" (f ), which is the ratio of free to total plasma concentration. The lack of clarity in distinguishing between these two terms has led to biased computations, erroneous interpretations, and misleading recommendations. The problems are highlighted in this paper, taking the example of calculation of Probability of Target Attainment (PTA).

Association of Occupational Exposures and Chronic Obstructive Pulmonary Disease Morbidity.

Objective: The aim of the study is to determine whether aggregate measures of occupational exposures are associated with chronic obstructive pulmonary disease (COPD) outcomes in the Subpopulations and Intermediate Outcome Measures in COPD study cohort.

Methods: Individuals were assigned to six predetermined exposure hazard categories based on self-reported employment history. Multivariable regression, adjusted for age, sex, race, current smoking status, and smoking pack-years determined the association of such exposures to odds of COPD and morbidity measures.