In-vitro and in-silico evidence for oxidative stress as drivers for RDW.

Red blood cell distribution width (RDW) is a biomarker associated with a variety of clinical outcomes. While anemia and subclinical inflammation have been posed as underlying pathophysiology, it is unclear what mechanisms underlie these assocations. Hence, we aimed to unravel the mechanisms in silico using a large clinical dataset and validate our findings in vitro. We retrieved complete blood counts (CBC) from 1,403,663 measurements from the Utrecht Patient Oriented Database, to model RDW using gradient boosting regression. We performed (sex-stratified) analyses in patients with anemia, patients younger/older than 50 and validation across platforms and care settings. We then validated our hypothesis regarding oxidative stress using an in vitro approach. Only percentage microcytic (pMIC) and macrocytic (pMAC) erythrocytes and mean corpuscular volume were most important in modelling RDW (RMSE = 0.40, R2 = 0.96). Subgroup analyses and validation confirmed our findings. In vitro induction of oxidative stress underscored our results, namely increased RDW and decreased erythrocyte volume, yet no vesiculation was observed. We found that erythrocyte size, especially pMIC, is most informative in predicting RDW, but no role for anemia or inflammation. Oxidative stress affecting the size of the erythrocytes may play a role in the association between RDW and clinical outcomes.

Describing Characteristics and Differences of Neutrophils in Sepsis, Trauma, and Control Patients in Routinely Measured Hematology Data.

Neutrophils have an important role in the immune response. These cells can be subjected to an impaired function and a shift in population depending on disease states. In sepsis, this shift is recognized and flagged by automated hematology analyzers, including the presence of band neutrophils, while these cells, although present, appear not to be detected in trauma patients. To better understand this suspected error in flagging, we set out to distinguish neutrophil populations of these two patient groups and compared these with controls. Different data-driven methods were used compared to standard algorithms used by the software of the analyzers. Using K-means clustering, we extracted neutrophils from raw hematology analyzer datafiles, and compared characteristics of these clusters between the patient groups. We observed an increased neutrophil size for both sepsis and trauma patients, but trauma patients had a smaller increase. Trauma patients also had a high proportion of cells with relatively high nuclear segmentation, which is contradictory with the presence of band neutrophils. This, in combination with the smaller size increase, might explain the inability to flag band neutrophils in trauma.

Insulin prices, availability and affordability in 13 low-income and middle-income countries.

INTRODUCTION: Globally, one in two people needing insulin lack access. High prices and poor availability are thought to be key contributors to poor insulin access. However, few studies have assessed the availability, price and affordability of different insulin types in low-income and middle-income countries in a systematic way. METHODS: In 2016, 15 insulin price and availability surveys were undertaken (using an adaptation of the WHO/Health Action International medicine price and availability measurement methodology) in Brazil, China (Hubei and Shaanxi Provinces), Ethiopia, Ghana, India (Haryana and Madhya Pradesh States), Indonesia, Jordan, Kenya, Kyrgyzstan, Mali, Pakistan, Russia (Kazan Province) and Uganda. Data were collected in three sectors (public, private pharmacies and private hospitals/clinics) in three regions per survey. Insulin prices were standardised to 10 mL 100 IU/mL in US dollars ($). Data were also collected for four comparator medicines. RESULTS: Mean availability was higher for human (55%-80%) versus analogue insulins (55%-63%), but only short-acting human insulin reached 80% availability (public sector). Median government procurement prices were $5 (human insulins) and $33 (long-acting analogues). In all three sectors, median patient prices were $9 for human insulins. Median patient prices for analogues varied between the public sector ($34) and the two private sectors ($44). Vials were cheaper than pens and cartridges. Biosimilars, when available, were mostly cheaper than originators. A low-income person had to work 4 and 7 days to buy 10 mL human and analogue insulin, respectively. For isophane human insulin, only three countries meet the WHO target of 80% availability of affordable essential medicines for non-communicable diseases in any sector. CONCLUSION: Improving insulin availability and affordability needs to be addressed through national and global actions, including prioritising the supply of more affordable human insulin, increasing competition through the use of lower priced quality-assured biosimilars, negotiating lower prices from manufacturers and improving distribution systems.