Fiber Optic Vibration Sensor Using PMMA Fiber for Real Time Monitoring

A vibration sensor is realized using PMMA (Polymethyl Methacrylate) fiber optic probe as sensor. The probe consists of two fibers, one is transmitting fiber and the other is receiving fiber. In this technique the sensor is non-contact and do not perturb the source of vibration. A portable high performance NI-DAQPad6016 with LabVIEW software is used to interrogate the vibration. The amplitude resolution of the sensor is 1µm within the frequency range 1-300 Hz. The thermal effect on the sensitivity of sensor is minimal. The sensor is suitable for real time monitoring of low frequency vibration and is of low cost and portable

A serum interleukin-6-based analysis of patients with nasopharyngeal swab reverse-transcriptase polymerase chain reaction negative for SARS-COV-2 infection with CO-RADS 4 and 5 on computed tomography of the chest

Background: Serum interleukin 6 (IL-6) levels have been studied in the diagnostic evaluation of patients with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) disease (COVID-19). Methods: We studied the utility of treatment with tocilizumab in COVID-19 patients (n=19) with a negative nasopharyngeal swab real time reverse transcriptase polymerase chain reaction (RT-PCR) test for SARS-CoV-2 who had suggestive computed tomography (CT) findings, namely, COVID-19 Reporting and Data System (CO-RADS) 4,5. Results: Receiver operator characteristic (ROC) curve analysis showed that serum IL 6 at a cut-off of >56.9 pg/L was a predictor of mortality in nasopharyngeal swab RT-PCR negative patients with suggestive CT findings. Tocilizumab had no significant effect on the mortality. Conclusions: In nasopharyngeal swab RT-PCR negative patients with suggestive chest CT findings, elevated serum IL-6 levels > 56.9 pg/L predicted mortality. However, treatment with tocilizumab had no effect on mortality