A Microwave Differential Dielectric Sensor Based on Mode Splitting of Coupled Resonators.

This study explores the viability of using the avoided mode crossing phenomenon in the microwave regime to design microwave differential sensors. While the design concept can be applied to any type of planar electrically small resonators, here, it is implemented on split-ring resonators (SRRs). We use two coupled synchronous SRRs loaded onto a two-port microstrip line system to demonstrate the avoided mode crossing by varying the distance between the split of the resonators to control the coupling strength. As the coupling becomes stronger, the split in the resonance frequencies of the system increases. Alternatively, by controlling the strength of the coupling by materials under test (MUTs), we utilize the system as a microwave differential sensor. First, the avoided mode crossing is theoretically investigated using the classical microwave coupled resonator techniques. Then, the system is designed and simulated using a 3D full-wave numerical simulation. To validate the concept, a two-port microstrip line, which is magnetically coupled to two synchronous SRRs, is utilized as a sensor, where the inter-resonator coupling is chosen to be electric coupling controlled by the dielectric constant of MUTs. For the experimental validation, the sensor was fabricated using printed circuit board technology. Two solid slabs with dielectric constants of 2.33 and 9.2 were employed to demonstrate the potential of the system as a novel differential microwave sensor.

Translation and validation of the Arabic version of the osteoarthritis quality of life questionnaire (OAQoL) in Saudi patients with osteoarthritis.

BACKGROUND: Osteoarthritis (OA) is a debilitating multifactorial degenerative rheumatic disease affecting millions of people around the globe. The osteoarthritis quality of life scale (OAQoL), originally produced in the English language, is an important tool used to assess the overall impact of OA and its treatment on the patient's quality of life. PURPOSE: The purpose of the study was to translate and validate the OAQoL in the Arabic language in order to use it on the Saudi population. METHODOLOGY: A bilingual panel comprising four healthcare professionals and one external certified medical translator translated the English version of the OAQoL to the Arabic language. A back translation was subsequently performed by two English-speaking translators and any differences were resolved by conferring with the original panel. The qualitative research was performed through cognitive debriefing interviews (CDIs) with 59 native Arabic patients who had clinically and radiologically confirmed osteoarthritis of any joint. The internal consistency of the 22 items was derived by leveraging the Cronbach's Alpha coefficient. RESULTS: 59 participants were included in the study, and more than half (52.5%) of them were men. The response rate was 100% and the mean time taken to answer the questionnaire was 10.5 min. The average Intraclass Correlation Coefficient (ICC) and Cronbach's Alpha were determined to be 0.93 each, indicating that all the items in the OAQoL were significantly interrelated. CONCLUSION: The translated Arabic version of the OAQoL questionnaire used in this study is a reliable and consistent tool that showed good comprehensibility and internal consistency.

Undergraduate health sciences students' response regarding COVID-19 pandemic in Saudi Arabia: an observational study.

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic represents a major health problem, and its influences may persist with emerging viral variants. The current work was to evaluate the knowledge, attitude, and learning satisfaction of health sciences students (HSS) regarding the COVID-19 pandemic. METHODS: A questionnaire-based cross-sectional study was conducted from 20 February 2021 to 20 March 2021. Participants were undergraduate HSS at Prince Sattam bin Abdulaziz University in Al Kharj, Saudi Arabia. The questionnaire has been generated and distributed via online form. The questionnaire used was based on previous studies and included demographic information and knowledge, attitudes, perception, and learning satisfaction related to the COVID-19 pandemic. RESULTS: Out of the 400 questionnaires distributed to eligible students, the current study included a total of 330 HSS (82.5% response rate) from colleges of medicine (25.5%), dentistry (11.8%), pharmacy (33.6%), and Applied Medical Sciences (29.1%) of participants. The mean scores of knowledge, attitude, and learning satisfaction attained by students were 5.63 ± 0.65 out of 6, 4.22 ± 1.01 out of 5, and 11.28 ± 2.9 out of 19, respectively. Results show an association between the knowledge score of students and their age-group and specialty-college. Students with chronic diseases reported lower attitude scores and rate of COVID-19 vaccine-willingness. Younger HSS had a higher learning satisfaction score than the older participants. CONCLUSION: Overall, participants show high knowledge level and positive attitude toward COVID-19 but fair learning satisfaction during the pandemic. Further studies are needed to improve the learning satisfaction and attitude of HSS in the future.

Incidental detection of paranasal sinuses abnormalities on CT imaging of the head in Saudi adult population.

The paranasal sinuses are hollowed, air-filled cavities surrounding the nasal cavity. Many pathological processes affect the sinuses, but inflammatory conditions are the commonest, even in asymptomatic patients who undergo head imaging for other indications showing one or more abnormalities of the sinuses. Our research aims to determine the prevalence of incidental paranasal sinuses abnormalities seen among patients who undergo head CT scanning. In addition, it provides baseline information for further investigations required. The study was designed to evaluate all patients who underwent head CT scanning for any reason unrelated to paranasal sinuses abnormalities. 1849 cases were selected and retrospectively analyzed from the elective and emergency CT in the last nine months, from August 2020 to April 2021. In order to meet the inclusion criteria, indications for imaging must not be sinus-related. The study was conducted on 1849 cases who had undergone head CT scans for pathology, 1204 (65%) were male and 645 (35%) were female. Abnormalities of the sinuses were found in about 617 (33%) of all patients, with a higher rate in males (22.23%) than females (11.14%). In addition, these abnormalities were found in younger patients at a higher rate than in middle and old ages 19.74%, 7.19%, and 6.44%, respectively. Our findings revealed that the prevalence of paranasal sinuses abnormalities in asymptomatic Saudi patients was high (33%). Most of the affected sinuses were the maxillary. The male patients were more affected than females in all findings.

Patterns and determinants of treatment for coronary artery disease: A cross-sectional study in the Kingdom of Saudi Arabia.

OBJECTIVES: To determine the clinical and coronary angiographic characteristics of patients with coronary artery disease (CAD) and the patterns and determinants of CAD treatment in Kingdom of Saudi Arabia (KSA). METHODS: We conducted a cross-sectional study including 242 patients at 3 hospitals in KSA between June 2018 and June 2019. We included all patients aged ≥18 years diagnosed with CAD on angiography. We carried out a multinomial logistic regression to ascertain the determinants of treatment patterns and treatment modalities. Covariates for this multivariate analysis were selected based on univariate regressions. RESULTS: The study population had a mean ± standard deviation of 58.3 ± 11.8 years, and 66.1% were male. The most frequent cardiovascular risk factor was diabetes (58.7%). Lesions involving the left anterior descending were reported among 68.6%, left circumflex among 51.2%, and right coronary arteries (RCA) among 48.8% of our patients. The most common treatment was the best medical therapy (lifestyle modifications and medical management), prescribed to 69.8% of patients. Patients aged ≤60 years with the left main disease or disease of the ramus had a higher likelihood of undergoing coronary artery bypass grafting (CABG). Contrarily, patients with RCA lesions were more likely to undergo a percutaneous coronary intervention (PCI). CONCLUSION: Patient age and anatomical localization of coronary atherosclerotic lesions were the main determinants of treatment with CABG or PCI.

Clinical, epidemiological, and management aspects of burn injuries in Saudi Arabia - A cross-sectional study.

BACKGROUND: Burns are a deleterious, but largely preventable health problem foisting physical, economic, social, emotional, and relational issues worldwide. METHODS: A cross-sectional study was conducted at the King Khalid Hospital and Prince Sultan Center for Health Services, and Prince Sattam Bin Abdulaziz University hospital in Al Kharj in the Kingdom of Saudi Arabia. The study included patients who presented themselves to the emergency department of the targeted hospitals with at least one documented burn injury between October 2018 and October 2019. The patients were followed from presentation to discharge. The etiology, location, severity, and options of treatment offered to them were recorded. The SPSS version 22.0 was used to analyze the data. Descriptive statistics were used to summarize the data as means, frequencies, and standard deviations. Categorical variables were compared using the Pearson's chi-square test. RESULTS: 180 patients with burn injuries were included in the study. The majority were adolescents and adults under the age of 40 (n = 171). The prevalence of first-degree burns was 12.8%, that of second-degree burns was 71.1%, and that of third-degree burns was 16.1%. The most common cause, area, and type of treatment were hot water injuries (36.1%), upper limbs (62.2%), and skin debridement respectively. CONCLUSION: Adolescents and young adults are the most frequently affected by burns while skin debridement was the most common treatment offered to the patients. In this context emergency hospital staff was required to be adequately equipped and trained.

Meaningful professional activities from family medicine practitioners' perspectives: a study from Saudi Arabia.

BACKGROUND: Family medicine practitioners (FMP) take care of a varied range of patients with undifferentiated conditions over a lifetime. Although it was incepted in Saudi Arabia in 1980, limited data exists on FMP. This paper explores what family physicians deem relevant. METHODS: A cross-sectional survey was conducted among FMP in Saudi Arabia in 2018-2019 who responded to an online questionnaire that listed 20 activities usually done by FMP asking them to rate their meaningfulness on a 5-point Likert Scale, and select the top 3 they would like to spend the most and the least time on. Chi-square statistics were used to compare preference for time spent on these six activities by participant characteristics. RESULTS: Of the 415 survey participants, the majority were male (246) and had a Bachelor's degree (176). The management of risk conditions, follow-up of chronic illnesses and running preventive health clinics were listed as most meaningful. The majority wished to spend more time on managing health risks, handling daily common complaints and follow-up of chronic illnesses and less time on terminal care activities (46.8%), emergency care (32.3%) and addiction medicine (23.4%). Bachelor's degree holders wished to spend more time on emergency care compared to Diploma, Board-certified and Fellowship holders (63%, 21%, 10% and 5%, respectively; P = 0.01). CONCLUSIONS: The activities preferred by FMP align with prevailing disease epidemiology. Variations in preferences of 'managing emergencies' reflect the varied format of training. Training of FMP should be standardized and further studies investigate reasons for specific preferences.

The association between overweight/obesity and psychological distress: A population based cross-sectional study in Saudi Arabia.

OBJECTIVES: The objective of this study was to compare the association between mental well-being between obese (classes 1 and 2), over-weight and non-obese population-based individuals. METHODS: A population-based cross-sectional study was conducted in Al-Kharj, Saudi Arabia. A total of 1019 Saudi nationals aged ≥ 18 years participated in the survey. BMI scores were used to categorize participants into three groups: Obese, overweighted and non-obese/non-overweight. Mental well-being was evaluated by using the validated Arabic version of the General Health Questionnaire version 12 (GHQ-12). RESULTS: We used total GHQ score (Mean=12; SD=5.23) to compare mental well-being between the four BMI class categories. The overall one-way ANOVA model was statistically significant (F = 7.018, d = 6, P < 0.001). In multivariate analysis, after adjusting for sociodemographic variables, diabetes and smoking statuses we found that higher psychological distress (as evident by a higher total GHQ score) was associated with higher BMI. The unstandardized Beta regression coefficient = 2.627; P = 0.034). Females were more likely to have higher psychological distress than males (unstandardized Beta = 1.466, P = 0.003). Job status whether being unemployed or 'civilian' (civil worker) was significantly associated with higher psychological distress (unstandardized Beta = 1.405, P = 0.041). Being diabetic has a 1.6 times higher risk of psychological distress (unstandardized Beta = 1.604, P = 0.027). CONCLUSION: The study highlights the public health implications of psychological distress amongst individuals with overweight and obesity in Saudi Arabia. Future longitudinal studies should explore the temporality of this relationship.