Saudi women pioneers in neurological surgery: Insights into progress and inclusion.

Forty years ago, General Professor Dr. Khalaf Al-Mouteary established the first neurosurgical department in the Kingdom of Saudi Arabia. Here, we explored various pieces of evidence on the progress and inclusion of Saudi female pioneers in the neurosurgical workforce of the Kingdom of Saudi Arabia. We gathered information data on the inclusion of women in neurological surgery retrieved from open-resource online documentation of the Ministry of Health and direct communication with Saudi Commission for Health Specialties (SCFHS) administrative services. Furthermore, regional neurosurgery program directors, four active registered consultants, were either interviewed live or through offline communications. Data on the current number of board-certified, active female neurosurgeons in either the government or private sectors, along with the number of current neurosurgery postgraduate residency program trainees, were obtained from the registered database of the SCFHS. Since 2002, 18 women (29 %) have graduated from the Saudi Neurosurgical Residency Training Program (SNRTP), in contrast,71 % of the graduates were male. The SNRTP is now training more than 34 females (30 %), who are progressing in their neurosurgical training across the country. The first Saudi woman to pursue neurosurgery was Dr Samia Abdel-Rahim Maimani, while the first woman to pass the Saudi Neurosurgery Board was Dr Aisha Al-Hajjaj in 2002. In 2021, board-certified female neurosurgeons in Saudi Arabia will represent approximately 3 % of all practicing neurosurgeons.

Synthesis of Trimetallic (Ni-Cu)@Ag Core@Shell Nanoparticles without Stabilizing Materials for Antibacterial Applications.

We report a simple method to prepare colloidal trimetallic (Ni-Cu)@Ag core@shell nanoparticles (NPs) without stabilizing materials. Experimental evidence was found for the successful synthesis of these NPs using X-ray diffraction (XRD), optical spectroscopy, and high-resolution transmission electron microscopy (HRTEM). The presence of core metals (Ni and Cu) was confirmed by elemental analysis using a total reflection X-ray fluorescence (TXRF) analysis. In addition, the absorption spectra of the prepared samples exhibited broad bands compared to the bands of the monometallic NPs, indicating the formation of a core-shell nanostructure. The antibacterial activity of the trimetallic NPs was evaluated against three Gram-negative (Pseudomonas aeruginosa, Escherichia coli, and Salmonella) and two Gram-positive (Streptococcus and Staphylococcus aureus) bacteria on Mueller-Hinton agar. These NPs showed high inhibition of bacterial growth at the low sample concentrations used in this study compared to other nanomaterials. One of the interesting results of the current study is that the inhibition zone of Pseudomonas aeruginosa as a resistant bacterium was high for most NPs. These results make the prepared samples promising candidates for antibiotic material applications.

Idiopathic thoracolumbar spinal epidural arachnoid cysts: A case report and systematic review.

Background: Idiopathic spinal epidural arachnoid cysts (SEACs) are rare and may cause myelopathy and cord compression. They typically arise from a congenital defect in the dura that communicates with the intrathecal subarachnoid space. Although the ideal treatment of SEACs is direct dural repair and cyst excision, there is as yet no clear standard of care for the management of these lesions. Methods: A 47-year-old female presented with myelopathy attributed to an magnetic resonance imaging-documented posterior epidural T12-L2 cyst (i.e., 1.1 × 6 × 3.3 cm) lesion. The patient underwent a direct dural repair of the fistulous communication between the subarachnoid space and the cyst, along with cyst drainage/ excision through a right-sided laminotomy. Postoperatively, the patient was asymptomatic. We additionally reviewed the literature regarding the management of SEACs. Results: Our review yielded 14 articles involving 18 patients with predominantly thoracolumbar (57%) SEACs that were either communicating (61%) or not communicating (39%) with the subarachnoid space. They averaged 35.5 years of age and exhibited a male preponderance (66%). Symptoms typically included pain (78%), followed by weakness/myelopathy (42%). Surgery frequently included bilateral laminectomies (57%) followed by unilateral laminectomies (50%) that typically resulted in symptom resolution. Conclusion: SEACs are rare typically thoracolumbar lesions that may cause myelopathy which resolves following direct dural closure/subarachnoid fistulous occlusion.

Handling Overdispersion in Mortality Data in Time-Series Epidemiologic Research Using SAS Software

Analysis of count event data such as mortality cases, were often modelled using Poisson regression model. Maximum likelihood procedures were used by using SAS software to estimate the model parameters of a Poisson regression model. However, the Negative Binomial distribution has been widely suggested as the alternative to the Poisson when there is proof of overdispersion phenomenon. We modelled the mortality cases as the dependent variable using Poisson and Negative Binomial regression and compare both of the models. The procedures were done in SAS by using the function PROC GENMOD. The results showed that the mortality data in Poisson regression exhibit large ratio values between deviance to degree of freedom which indicate model misspecification or overdispersion. This large ratio was found to be reduced in Negative Binomial regression. The Normal probability plot of Pearson residual confirmed that the Negative Binomial regression is a better model than Poisson regression in modelling the mortality data. The objective of this study is to compare the goodness of fit of Poisson regression model and Negative Binomial regression model in the application of air pollution epidemiologic time series study by using SAS software.