Low-cost sensors for measuring airborne particulate matter: Field evaluation and calibration at a South-Eastern European site.

Low-cost sensors are useful tools for the collection of air quality data, augmenting the existing regulatory monitoring networks and providing an unprecedented opportunity to increase their spatial coverage. This study presents a calibration process of a low-cost PM sensor (PurpleAir PA-II, PAir) in ambient conditions in the city of Patras, Greece, during 18 months of 2017-2018. The hourly PM and PM measurements using the original sensor values were reasonably well correlated (R = 0.

Methodology for improving reliability of river discharge measurements.

Programs to monitor water characteristics are undertaken to identify any possible water pollution of a river. To compute reliable water pollution loads, accurate river discharge and pollutant/tracer concentrations are required. When pollutants/tracers are measured with sufficient precision, the accuracy of river discharge measurements becomes the most critical parameter of the pollutant load computation, as well as the largest error source.

Delayed traumatic rupture of the thoracic aorta into the esophagus.

A case of delayed rupture of the thoracic aorta into the esophagus after blunt thoracic injury is reported. It involved a hemodynamically stable 18-year-old male patient without any clinical or radiological signs to indicate aortic injury. Aortoesophageal fistula presented in the fifth post traumatic day, with a sudden dyspnea episode, intraperitoneal hemorrhage and lower gastrointestinal bleeding, due to intraperitoneal and intragastric rupture of intramural esophageal hematoma.

Failure after reverse total shoulder arthroplasty: what is the success of component revision?

Background: Complication rates remain high after reverse total shoulder arthroplasty (RTSA). Salvage options after implant failure have not been well defined. This study examines the role of reimplantation and revision RTSA after failed RTSA, reporting outcomes and complications of this salvage technique.

Chronic Pain Patients' Impressions of an Emergency Department Opioid Prescribing Guideline Poster.

Objective: To determine if an opioid prescribing guideline poster, meant to be posted in an emergency department (ED) triage area, would deter patients with chronic pain from seeking care.

Methods: We prospectively enrolled patients presenting to a chronic craniofacial pain clinic affiliated with an urban academic Level I trauma center. Patients were surveyed with a close-ended, structured questionnaire.