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    A New Approach for Respiratory Droplet Trajectory: Implications for Viral and Bacterial Disease Transmission in Emergency Departments
    (Tottori University Faculty of Medicine, 2025) Aydin, Ismail Erkan; Aydin, Baran; Aydin Savas, Seckin; Aydin, Mehmet
    Background The objective of this study is to devise a simplified approach for estimating respiratory particle trajectory to avoid infection in gathering places of emergency departments. Methods To the authors’ knowledge, no sufficient/ obvious data exist on lateral routes of disease transmission through respiratory droplets along the x-axis. The present study establishes a preliminary baseline approach based on the upper pharynx-mouth geometry for lateral social distancing to protect susceptible persons from the droplets of an infected person. An enhanced version of ART (Aydin’s Research Team) model has been employed as a supplementary tool of Stokes’s law for quantification of motion dynamics of the virus/ bacterium-laden droplets in public indoor places. Results A range of droplet diameters varying from 1 ?m to 2000 ?m were considered in this study. The droplets with a diameter of ? 22.5 ?m can completely evaporate during settling and droplet nuclei can remain in the air for extended periods. An individual Influenza virus can stay airborne for 34.4 days, while a single Streptococcus bacterium remains suspended for 18.6 hours. The proper social distancing between infected and healthy persons should be about 2.9 and 0.9 m longitudinally, and 0.45 and 0.15 m laterally based on the novel aspects of the present study for sneezing/coughing and breathing/talking, respectively. The trajectory of respiratory particles in the streamwise and radial directions resembles the shape of a truncated cone due to the upper pharynx-mouth relationship. Conclusion The outcomes of this study can help further understanding of respiratory particle trajectory, thereby improving measures to mitigate disease transmission. © 2025 Tottori University Medical Press.
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    Diagnostic accuracy of point-of-care ultrasonography in physeal fractures
    (W B Saunders Co-Elsevier Inc, 2026) Gurkan, Onur; Kozaci, Nalan; Colak, Songul; Aydin, Ismail Erkan
    Objective: The aim of this study was to compare the accuracy of Point of Care Ultrasound (POCUS) with X-ray (XR) in the diagnosis of physeal fractures and Salter-Harris classification in pediatric patients. Methods: The study was conducted in a university hospital emergency department between January 1, 2024 and June 30, 2025. Pediatric patients aged 0-18 years who were admitted to the emergency department due to extremity trauma, had stable vital signs, and presented with suspected physeal fractures on physical examination were included in this prospective study. Results: A total of 117 patients were included in the study. Fractures were detected on XR in 73 % of patients. Compared with XR, POCUS demonstrated a sensitivity (Sn) of 97 %, specificity (Sp) of 94 %, positive predictive value (PPV) of 98 %, negative predictive value (NPV) of 91 % (AUC: 0.951, 95 % CI: 0.90-1.00), and a kappa value of 0.894 for fracture detection. For physeal fractures, POCUS showed Sn 93 %, Sp 95 %, PPV 74 %, NPV 99 % (AUC: 0.942, 95 % CI: 0.87-1.00) and kappa = 0.794. For detecting the extension of the fracture into the joint space, POCUS showed Sn 62 %, Sp 100 %, PPV 54 %, NPV 100 % (AUC: 0.810; 95 % CI: 0.68-0.94) and a kappa value of 0.727. Moderate concordance was observed between POCUS and XR for Salter-Harris classification (kappa = 0.673). Conclusion: POCUS demonstrates high sensitivity in detecting traumatic extremity fractures and physeal fractures in pediatric patients. However, only moderate concordance was observed between POCUS and XR in assessing the extension of the fracture into the joint space and in applying the Salter-Harris classification. (c) 2025 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
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    The Relationship Between Depression, Anxiety, and Stress Levels and Eating Behavior in Emergency Service Workers
    (Cureus Inc, 2023) Erden, Selime Celik; Yilmaz, Banu Karakus; Kozaci, Nalan; Uygur, Abdullah Burak; Yigit, Yavuz; Karakus, Kadir; Aydin, Ismail Erkan
    Introduction It is seen that shift work causes various biological, psychological, and behavioral problems in individuals. This study aimed to determine the eating attitudes and behaviors of health workers working in shifts in a stressful environment such as the emergency service and to examine the relationship between depression, anxiety, and stress levels and eating behaviors (emotional eating, restrictive eating, and external eating) in terms of sociodemographic and clinical characteristics. Material and Methods Sociodemographic data form; Depression, Anxiety, and Stress Scale (DASS); and Dutch Eating Behavior Questionnaire (DEBQ) were used. The study sample consisted of 92 employees (doctor, nurse, emergency medical technician (EMT), medical secretary, and security, staff) who were actively on duty in the emergency department of Alanya Alaaddin Keykubat University Medical Faculty Training and Research Hospital. Results In our study, when the eating behavior of emergency service workers was evaluated in terms of emotional, external, and restricted eating sub-dimensions, depression (p=0.043), anxiety (p=0.017), increased stress levels (p=0.002), being female (p=0.022), nurse-emergency medical technician profession (p=0.001), working in 24-hour shifts (p=0.001), and diet history (p=0.013) were associated with emotional eating. In addition, an increase in depression levels (p=0.048), being single (p=0.015), working in 24-hour shifts (p=0.005), a decrease in age (p<0.001) with extrinsic eating, an increase in body mass index (BMI) (p=0.020) and waist circumference (p=0.049), and diet history (p<0.001) were associated with restricted eating. Conclusions In our study, among the sociodemographic factors, being female, being single, working in 24-hour shifts, diet history, nurse-EMT profession, and undergraduate education level were found to increase the tendency to develop eating behavior problems. An increase in depression levels, being single, working in 24-hour shifts, and a decrease in age were associated with extrinsic eating. There is a correlation between depression, anxiety, and stress scores and emotional eating scores. Additionally, we found significant correlations between body mass index, waist circumference, diet history, and restricted eating scores. In the approach to eating behavior problems, it is important to determine the individual eating behavior disorder. Due to the increased risk of eating behavior disorder in those who work in long shifts such as 24 hours, it will be possible to organize work programs and increase the quality of service.
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    The use of Hückel and Onsager equation to derive stimulating voltage for a cell
    (Nature Portfolio, 2025) Aydin, Ismail Erkan; Ovey, Ishak Suat; Bektas, Hesna; Aydin, Mehmet
    This article deals with the use of H & uuml;ckel-Onsager equation to determine potential drop in the voltage-dependent ion channels of cell membranes. The necessary parameters/variables were derived from literature to describe how one calculates entry potential at a hypothetical plane in the selectivity filter of ion channels. We start with computation of entry potential for a resting potential of -70 mV as soon as a few voltage-gated Na+ channels open. Calculated corresponding entry potential was - 15.01 mV. A simplified approach linked to this reference value of entry potential was devised for quantifying stimulus voltage to generate an action potential in the excitable cells with different resting potentials. Threshold voltage of stimulus, which is enough strength to depolarize cell membrane to threshold level, varied between 8.58 and 17.16 mV for the resting potentials of -40 and - 80 mV, respectively. The magnitude of difference between resting and threshold potentials was wider in case of higher negative resting voltages. The velocity and number of ions passing through one channel were indirectly computed for an estimated entry potential/stimulus voltage. Their quantities were the power functions of electrical field strengths. This work can lead to improving strategies for early management of status epilepticus in emergency departments.
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    Tr ansient Complete Right Bundle Branch Block Due _ to _ Lung _ Contusion: Case Re port
    (Emergency Medicine Physicians Assoc Turkey, 2024) Kozaci, Nalan; Aydin, Ismail Erkan; Ersahin, Durmus Ali; Yuksel, Yavuz
    Right bundle branch block (RBBB) may occur in lung diseases and cardiovascular diseases. A 25-year-old male patient was admitted to emergency department after a motorcycle accident. Contusion was detected in bilateral lungs, and pneumothorax with laceration were detected in the right lung. ECG revealed103 bpm, right axis deviation, and complete RBBB. ECGrevealed 83 bpm, complete RBBB continued at the 6th hour after tube thoracostomy, andhigh sensitive TnI was normal. Chest X-ray wasnormal on the 4th day of hospitalization, and ECG revealed74 bpm, normal sinus rhythm. In thoracic trauma, ECG changes may develop as a result of lung contusion. ECG findings improve as the lung contusion heals.