Networks of Boards of Directors: Is the 'Golden Skirts' Only an Illusion?

In this empirical research, using a database of 41,107 directors from 38 European countries from 1999 to 2015, we analyze the topological features of the director's networks and observe that the degree distribution for both men and women follows a power law. The exponent of the power law is higher for women than the one for men, suggesting a milder role of interlocking for women that points to the absence of the 'Golden Skirts' phenomenon at the European level (i.e., women who accumulate more directorships than men). This gender gap in power laws has faded away during the studied period, coinciding with two counteracting external forces. On one hand, the diffusion of corporate governance good practices in European companies, reducing the size of boards and discouraging the multiple directorships by a single person, democratizing the director's network. On the other, the political and regulatory pressure for more women on boards across Europe, creating a high demand for women in the network.

Estimating population ecology models for the WWW market: evidence of competitive oligopolies.

This paper proposes adapting a particle filtering algorithm to model online Spanish real estate and job search market segments based on the Lotka-Volterra competition equations. For this purpose the authors use data on Internet information searches from Google Trends to proxy for market share. Market share evolution estimations are coherent with those observed in Google Trends. The results show evidence of low website incompatibility in the markets analyzed. Competitive oligopolies are most common in such low-competition markets, instead of the monopolies predicted by theoretical ecology models under strong competition conditions.

Network diffusion of gender diversity on boards: A process of two-speed opposing forces.

Network diffusion processes or how information spreads through networks have been widely examined in numerous disciplines such as epidemiology, physics, sociology, politics, or computer science. In this paper, we extend previous developments by considering a generalization of the diffusion by considering the possibility of differences in the speed of diffusion and reduction depending on the forces' directions. In this situation, the differential speed of diffusion produces deviations from the standard solution around the average of the initial conditions in the network. In fact, this asymmetry gives rise to non-linear dynamics in which, contrary to the symmetric case, the final solution depends on the topology of the graph as well as on the distribution of the initial values. Counter-intuitively, less central nodes in the network are able to exert a higher influence on the final solution. This behavior applies also for different simulated networks such as random, small-world, and scale-free. We show an example of this kind of asymmetric diffusion process in a real case. To do so, we use a network of US Boards of Directors, where boards are the nodes and the directors working for more than one board, are the links. Changes in the proportion of women serving on each board are influenced by the gradient between adjacent boards. We also show that there is an asymmetry: the gradient is reduced at a slower (faster) rhythm if the board has less (more) women than neighboring boards. We are able to quantify the accumulated effect of this asymmetry from 2000 to 2015 in the overall proportion of women on boards, in a 4.7 percentage points (the proportion should have been an 14.61% instead of the observed 9.93% in 2015).

Systemic inflammatory response and increased risk for ventilator-associated pneumonia: a preliminary study.

OBJECTIVE: Inflammatory markers have been assessed for the diagnosis and follow-up of ventilator-associated pneumonia (VAP), but their potential role in predicting the risk for VAP is unknown. We prospectively assessed the evolution of cytokines in mechanically ventilated patients and their predictive and diagnostic role for VAP. DESIGN: Prospective observational study. SETTING: Medical intensive care unit. PATIENTS: Mechanically ventilated patients. Exclusion criteria were active infection at admission and subsequent extrapulmonary infection. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Sequential measurements of interleukin (IL)-1, IL-6, IL-8, IL-10, and tumor necrosis factor-alpha were done in 44 ventilated patients. VAP was suspected in 20 cases and microbiologically confirmed in nine. At admission, demographics, severity scores, and clinical and standard laboratory values did not discriminate patients with and without VAP, but the median (interquartile range) serum levels of IL-6 were higher in patients who subsequently developed VAP, compared with those without VAP (235 [141-803] vs. 113 [60-170] pg/mL, p = 0.015). The sensitivity and specificity of IL-6 to predict VAP was 71% and 78%, respectively, using 198 pg/mL as optimal cutoff, with relative risk (95% confidence interval) 8.9 (1.4-56.3). When VAP was suspected, serum levels of IL-6 were higher in patients with confirmed compared with nonconfirmed VAP (1131 [496-1987] vs. 236 [115-357] pg/mL, p = 0.016). The sensitivity and specificity to discriminate between confirmed and nonconfirmed VAP was 71% and 89%, respectively, using 620 pg/mL as optimal cutoff, with relative risk (95% confidence interval) 15.0 (1.2-185.2). CONCLUSIONS: IL-6 at admission is an early and accurate indicator of patients at increased risk for VAP. IL-6 is also accurate in discriminating patients with VAP from other causes of pulmonary infiltrates. Extrapolation of these results to the overall population of critically ill patients is limited by the small number of patients.

Pharmacokinetics of Amikacin in Critical Care Patients on Extracorporeal Device.

In this study, we evaluate the effect of extracorporeal membrane oxygenation (ECMO) and ventricular assist devices (Levitronix) on the pharmacokinetic of amikacin in critically ill patients. Twelve patients with ECMO and three with Levitronix devices who started treatment with amikacin were included. Amikacin pre (Cmax) and post (Cmin) dose serum concentrations were measured during the first 72-96 hours of treatment initiation. Pharmacokinetic parameters were performed by Bayesian adjustment. The median initial dose was 1,000 mg (range: 600-1,400 mg). Mean plasma concentrations were Cmax 58.6 mg/L (17.0 mg/L); Cmin 9.58 mg/L (7.8 mg/L). Patients with an ECMO device had a higher volume of distribution (0.346 [0.033] vs. 0.288 [0.110] L/kg) and a lower plasma clearance (1.58 [0.21] vs. 3.73 [1.03] L/h) than the control group. This phenomenon was also observed in those patients with simultaneous use of ECMO and hemodilafiltration. For patients with Levitronix system, no significant alterations in the volume of distribution were observed, although a lower plasma clearance was noticed. Placement of ECMO devices alters the pharmacokinetic parameters of amikacin in the critically ill patients and should be considered when selecting the initial dose.

Treatment of intra-abdominal bleeding with recombinant activated factor VII in a patient with disseminated intravascular coagulation secondary to septic shock.

Although mainly indicated for treatment of bleeding in haemophilia patients with inhibitors, recombinant activated factor VII (rFVIIa) has also been successfully used in other situations. However, no data are available on its use in the treatment of disseminated intravascular coagulation (DIC) secondary to septic shock. We report a man with DIC and septic shock due to retrocaecal appendicitis and severe intra-abdominal bleeding after surgery. Despite conventional treatment, the bleeding persisted, and treatment with rFVIIa controlled the haemorrhage. No side-effects related to rFVIIa were noted. This case suggests a potential role of rFVIIa in the treatment of severe bleeding associated with DIC.