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Abstract Aircraft cabins have high‐performance ventilation systems, yet typically hold many persons in close proximity for long durations. The current study estimated airborne virus exposure and infection reductions when middle seats are vacant compared to full occupancy and when passengers wear surgical masks in aircraft. Tracer particle data reported by U.S. Transportation Command (TRANSCOM) and CFD simulations reported by Boeing were used along with NIOSH data, to build nonlinear regression models with particle exposure and distance from particle source as variables. These models that estimate exposure at given distances from the viral source were applied to evaluate exposure reductions from vacant middle seats. Reductions averaged 54% for the seat row where an infectious passenger is located and 36% for a 24‐row cabin containing one infectious passenger, with middle seats vacant. Analysis of the TRANSCOM data showed that universal masking (surgical masks) reduced exposures by 62% and showed masking and physical distancing provide further reductions when practiced together. For a notional scenario involving 10 infectious passengers, compared with no intervention, masking, distancing, and both would prevent 6.2, 3.8, and 7.6 secondary infections, respectively, using the Wells–Riley equation. These results suggest distancing alone, masking alone, and these practiced together reduce SARS CoV‐2 exposure risk in increasing order of effectiveness, when an infectious passenger is present.

Purpose: Our aim was to assess the different voice prostheses (VPs) to identify the most efficient, safest, patient-tailored, longest lifetime, and inexpensive VPs and assess the different factors affecting their quality. Method: In September 2017, 15 databases were searched to include all randomized controlled trials. A new search was done in May 2019 to include all other study design articles, which include all the new-era VPs subtypes. Network meta-analysis (NMA) was applied to all 27 outcomes, besides NMA overall and partial order setting was done by using Hasse scatter plots. p values were used in NMA, where the best VPs are approaching one and the least approaches zero. Meta-analysis was done for the rest of the outcomes. Results: Two hundred one articles were eligible for inclusion in our study (N = 11,918). Provox-2 was significantly the most efficient and safest device concerning the most patient preference (odds ratio [OR] = 33.88 [0.65, 1762.24]; p = 0.92), the least dislodgement (risk ratio [RR] = 0.27 [0.13, 0.57]; p = 0.79), the least airflow resistance (RR = 0.42 [0.08, 2.11]; p = 84), the least granulation formation (RR = 0.73 [0.02, 26.32]; p = 0.60), and the least VPs' inaccurate size (RR = 0.77 (0.23, 2.61); p = 0.66). Heat and moisture exchanger addition showed a significant increase in maximum phonation time and breathing experience, with p values (1 and 0.59), respectively. While heat and moisture exchanger addition showed a significant decline in stoma cleaning frequency, coughing frequency, forced expectoration, sputum production, sleeping problems, and loosening of adhesive, with p values (0.99, 0.72, 0.69, 0.96, 1, and 0.96), respectively, Groningen low resistance and Nijdam were considered the worst devices with both overall mean p value of 0.44. Conclusions: Provox-2 is considered the best choice as being the most preferable for patients, with the least airflow resistance, dislodgment, granulation formation, and prosthesis inaccurate size. Groningen low resistance and Nijdam were considered the worst devices according to our analysis.

Background: Breast cancer has continued to be the most common cancer afflicting women, accounting for 31% of all new cancer cases in the female population. Every year, thousands of patients undergo surgery in the region of the breast and axilla. Surgery is one of the mainstays of treatment, and a procedure called modified radical mastectomy (MRM) is now a standard surgical treatment for early-stage breast cancers. Objective: To evaluate the Efficacy of combined ultrasound guided Pectoral Nerve Block (PECS I block and PECS II block) using Bupivacaine with or without Magnesium Sulfate in modified radical mastectomy under general anathesia. Patients and Methods: After obtaining approval from the medical ethical committee in Ain Shams University This study was conducted in the operating theatres of Ain Shams University Hospitals. It included Thirty Female patients undergoing Modified Radical Mastectomy were divided randomly into two groups, each group consisted of 25 patients group I in which patients received general anesthesia followed by PECS BLOCK using only bupivacaine 0.25 % and group II in which patients received general anesthesia followed by PECS BLOCK using bupivacaine 0.25 % plusmagnesiumsulfate 50% (200mg). Results: The two groups were adequately monitored and assessed post-operatively and they were compared regarding analgesic outcome by using the visual analogue scaling system, besides, recording time for first for analgesic need and total consumption of opioid and analgesic in the 1st 24 postoperative hours. Demographic data and post operative hemodynamics were also assessed. Conclusion: The addition of 200mg of magnesium sulfate to bupivacaine in an ultrasound-guided Pectoral Nerve Block significantly reduce postoperative opioid consumption, prolong the duration of the analgesia, and reduce the VAS score without significant side effects after Modified Radical Mastectomy under general anesthesia. [ABSTRACT FROM AUTHOR]