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INTRODUCTION: Improving breastfeeding practices does not always link to interventions relying only on improving nutrition awareness and education but needs cultural and behavioral insights . AIM: This study aimed to evaluate the changes in core breastfeeding indicators as a result of the use of social marketing (SM) approach for improving breastfeeding practices of Egyptian women and the physical growth of infants aged 6 to 12 months. The core breastfeeding indicators were: Early initiation of breastfeeding within one hour of birth, Predominant and exclusive breastfeeding to 6 months (EBF), Bottle feeding with formula, continued breastfeeding to 1 and 2 years, and responsiveness to cues of hunger and satiety. METHODS: A quasi-experimental longitudinal study with a posttest-only control design was done over 3 years in three phases; the first was in-depth interviews and formative research followed by health education and counseling interventions and ended by measuring the outcome. Motivating mothers' voluntary behaviors toward breastfeeding promotion "feeding your baby like a baby" was done using SM principles: product, price, place, and promotion. The interventions targeted 646 pregnant women in their last trimester and delivered mothers and 1454 women in their childbearing period. The statistical analysis was done by using SPSS program, version 26. RESULTS: Most mothers showed significantly increased awareness about the benefits of breastfeeding and became interested in breastfeeding their children outside the house using the breastfeeding cover (Gawn) (p < 0.05). Breastfeeding initiation, exclusive breastfeeding under 6 months, frequency of breastfeeding per day, and percentage of children who continued breastfeeding till 2 years, were significantly increased (from 30%, 23%, 56%, and 32% to 62%, 47.3%, 69%, and 43.5% respectively). The girls who recorded underweight results over boys during the first year of life were significantly improved (p < 0.01) after the intervention (from 52.1% to 18.8% respectively). At the same time, girls found to be obese before the intervention (15.6%) became no longer obese. CONCLUSIONS: Improvement for the majority of the key breastfeeding indicators and physical growth of infants indicates that raising a healthy generation should start by promoting breastfeeding practices that are respectable to societal norms.
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Lactancia Materna , Promoción de la Salud , Mercadeo Social , Humanos , Lactancia Materna/estadística & datos numéricos , Egipto , Femenino , Lactante , Estudios Longitudinales , Adulto , Promoción de la Salud/métodos , Adulto Joven , Masculino , Desarrollo Infantil/fisiología , Recién NacidoRESUMEN
Tranexamic acid (TXA) has long been utilized in spine surgery and can be administered through intravenous (IV) and topical routes. Although, topical and IV administration of TXA are both effective in decreasing blood loss during spine surgery, complications like deep vein thrombosis (DVT) and pulmonary embolism have been reported with the use of intravenous TXA (ivTXA). These potential complications may be mitigated through the use of topical TXA (tTXA). To assess optimal dosing protocols and efficacy of topical TXA in spine surgery, Embase, Ovid-MEDLINE, Scopus, Cochrane, and clinicaltrials.gov were queried for original research on the use of tTXA in adult patients undergoing spine surgery. Data parameters analyzed included blood loss, transfusion rate, thromboembolic, and other complications. Data was synthesized and confidence evaluated according to the Grades of Recommendation, Assessment, Development, and Evaluation approach. Nineteen studies were included in the final analysis with 2197 patients. Of the 18 published studies, 9 (50%) displayed high levels of evidence. Topical TXA showed a trend towards a lower risk of transfusion and complications. Protocols that used 1g tTXA showed a significantly reduced risk for transfusion when compared to controls (risk ratio -1.05, 95% CI (-1.62, -0.48); P = 0.94, I2 = 0%). Complications associated with tTXA included DVTs and wound infections. Topical TXA was non-inferior to intravenous TXA with similar efficacy and complication profiles for bleeding control in spine surgery; however, more studies are needed to discern benefits and risks.
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Embolia Pulmonar , Ácido Tranexámico , Adulto , Humanos , Ácido Tranexámico/uso terapéutico , Oportunidad RelativaRESUMEN
OBJECTIVE: Many techniques are available for the intraoperative assessment of brain perfusion during carotid endarterectomy, such as carotid stump pressure, near-infrared spectroscopy, somatosensory evoked potentials, transcranial Doppler, electroencephalography, and clinical assessment. The decision for selective carotid shunt insertion is dependent on clinical deterioration or the detection of cerebral hypoperfusion after cross-clamping of the internal carotid artery. Monitoring cerebral oximetry using near-infrared spectroscopy is a noninvasive technique for cerebral oxygen saturation measurement, reflecting changes in cerebral blood flow during carotid endarterectomy. The aim of this study was to evaluate the reliability of near-infrared spectroscopy as a predictor of selective shunting during carotid endarterectomy. METHODS: In total, 47 conventional carotid endarterectomy surgeries were performed at our hospital between March 2016 and December 2021. All surgeries were performed under a regional cervical block supplemented with local infiltration anesthesia. All patients were monitored by cerebral oximetry using bilateral near-infrared spectroscopy probes and clinical assessment through communication with the patient (numerical, visual, and verbal) to indicate a selective shunt. Near-infrared spectroscopy values were recorded before and after internal carotid cross-clamping and after declamping. Any decrease in ipsilateral cerebral oximetry-near-infrared spectroscopy values equal to or more than 20% from the pre-clamping baseline reading associated with deterioration in neurological status (hemiparesis, aphasia, or deterioration in level of consciousness) after internal carotid artery cross-clamping was considered an indication for intraluminal carotid shunting. RESULTS: After internal carotid artery cross-clamping, 5 of 47 patients (10.6%) developed a significant drop in cerebral oxygen saturation associated with obvious clinical assessment deterioration in verbal communication and weakness in contralateral arm power. A Pruitt-Inahara carotid shunt was subsequently inserted, and 42 patients remained stable throughout surgery. The average decline in ipsilateral near-infrared spectroscopy values was 23.8% in patients with clinical deterioration. The average decline was 8.6% in patients who remained stable. CONCLUSIONS: Monitoring ipsilateral cerebral oximetry using near-infrared spectroscopy is an easy and reliable method for indicating selective shunting during carotid endarterectomy. A 20% decrease in ipsilateral brain tissue oximetry after internal carotid artery cross-clamping provides a reliable cut-off value for selective intraluminal carotid shunting during carotid endarterectomy.
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Non-invasive imaging biomarkers are useful for prognostication in patients with traumatic brain injury (TBI) at high risk for morbidity with invasive procedures. The authors present findings from a scoping review discussing the pertinent biomarkers. Embase, Ovid-MEDLINE, and Scopus were queried for original research on imaging biomarkers for prognostication of TBI in adult patients. Two reviewers independently screened articles, extracted data, and evaluated risk of bias. Data was synthesized and confidence evaluated with the linked evidence according to the Grades of Recommendation, Assessment, Development, and Evaluation (GRADE) approach. Our search yielded 3104 unique citations, 44 of which were included in this review. Study populations varied in TBI severity, as defined by Glasgow Coma Scale (GCS), including: mild (n=9), mild and moderate (n=3), moderate and severe (n=7), severe (n=6), and all GCS scores (n=17). Diverse imaging modalities were used for prognostication, predominantly computed tomography (CT) only (n=11), magnetic resonance imaging (MRI) only (n=9), and diffusion tensor imaging (DTI) (N=9). The biomarkers included diffusion coefficient mapping, metabolic characteristics, optic nerve sheath diameter, T1-weighted signal changes, cortical cerebral blood flow, axial versus extra-axial lesions, T2-weighted gradient versus spin echo, translocator protein levels, and trauma imaging of brainstem areas. The majority (93%) of studies identified that the imaging biomarker of interest had a statistically significant prognostic value; however, these are based on a very low to low level of quality of evidence. No study directly compared the effects on specific TBI treatments on the temporal course of imaging biomarkers. The current literature is insufficient to make a strong recommendation about a preferred imaging biomarker for TBI, especially considering GRADE criteria revealing low quality of evidence. Rigorous prospective research of imaging biomarkers of TBI is warranted to improve the understanding of TBI severity.
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Lesiones Traumáticas del Encéfalo , Imagen de Difusión Tensora , Adulto , Humanos , Estudios Prospectivos , Lesiones Traumáticas del Encéfalo/diagnóstico por imagen , Biomarcadores , Tomografía Computarizada por Rayos XRESUMEN
Severe acute malnutrition (SAM) is a major public health concern in Yemen, particularly in areas affected by ongoing conflict war. SAM is defined as a very low weight for height, by visible severe wasting, or by the presence of nutritional edema. The prevalence of SAM in Yemen has increased dramatically since the onset of the conflict. Prior studies have focused on evaluating prevalence, but this novel study aimed to assess the risk factors associated with SAM prevalence. Five thousand two hundred and seventeen patients of SAM admitted at 12 sentinel hospitals were enrolled, and data were collected and analyzed. Marasmus was the most common form. Numerous risk factors contribute to the high prevalence of SAM in Yemen, including food insecurity. The current conflict has hampered food production, distribution, and access. Awareness of risk factors can prevent SAM in the general population.
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Desnutrición , Desnutrición Aguda Severa , Humanos , Niño , Lactante , Yemen/epidemiología , India , Desnutrición Aguda Severa/epidemiología , Factores de Riesgo , Delgadez , Desnutrición/epidemiologíaRESUMEN
Retrosigmoid craniotomy for microvascular decompression (MVD) has been traditionally performed via craniectomy. Various closure techniques have been described, yet factors associated with wound-related complications remain undetermined. Accordingly, herein, we sought to identify risk factors associated with wound-related complications after such procedures. An institutional retrospective case-control study was performed; outcomes of interest were cerebrospinal fluid (CSF) leak, wound dehiscence, wound infection, and pseudomeningocele. Univariate analysis was performed using Wilcoxon rank sum test for non-parametric continuous outcomes and chi-square test for categorical outcomes. Multivariate logistic regression was performed on binomial outcome variables. The study population included 197 patients who underwent MVD for trigeminal neuralgia (83.2%), hemifacial spasm (12.2%), vestibular nerve section (3.0%), and glossopharyngeal neuralgia (1.5%). The overall wound-related complication rate was 14.2% (n = 28), including twelve patients (6.1%) with CSF leak, ten patients (5.1%) with wound infection, ten patients (5.1%) with pseudomeningocele, and nine (4.6%) patients with wound dehiscence. Using multivariate logistic regression, preoperative anemia and current tobacco use were associated with significantly higher rates of complications (OR 6.01 and 4.58, respectively; p < 0.05), including CSF leak (OR 12.83 and 12.40, respectively, p < 0.05). Of note, use of synthetic bone substitute for cranioplasty was associated with a significantly lower rate of complications (OR 0.13, p < 0.01). Preoperative anemia and current tobacco use significantly increased, while synthetic bone substitute cranioplasty significantly decreased, odds of wound-related complications, the need for treatment, and CSF leaks. Additionally, higher BMI, longer operative duration, and prior radiosurgery may increase risk for wound-related complications.
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Pérdida de Líquido Cefalorraquídeo/diagnóstico , Pérdida de Líquido Cefalorraquídeo/etiología , Craneotomía/efectos adversos , Cirugía para Descompresión Microvascular/efectos adversos , Infección de la Herida Quirúrgica/diagnóstico , Infección de la Herida Quirúrgica/etiología , Adulto , Anciano , Anciano de 80 o más Años , Estudios de Casos y Controles , Craneotomía/tendencias , Femenino , Enfermedades del Nervio Glosofaríngeo/diagnóstico , Enfermedades del Nervio Glosofaríngeo/cirugía , Espasmo Hemifacial/diagnóstico , Espasmo Hemifacial/cirugía , Humanos , Masculino , Cirugía para Descompresión Microvascular/tendencias , Persona de Mediana Edad , Procedimientos Neuroquirúrgicos/efectos adversos , Complicaciones Posoperatorias/diagnóstico , Complicaciones Posoperatorias/etiología , Estudios Retrospectivos , Factores de Riesgo , Neuralgia del Trigémino/diagnóstico , Neuralgia del Trigémino/cirugíaRESUMEN
BACKGROUND: Effective treatment for pediatric embryonal brain tumors includes dose-intensive multiagent chemotherapy (DIMAC) followed by high-dose chemotherapy with stem cell rescue (HDCSCR). Use of repeated cycles of DIMAC including high-dose methotrexate (HDMTX) without HDCSCR has not been described. PROCEDURE: We retrospectively reviewed the responses/toxicities in 13 patients (aged 2-155 months, median 22 months) with central nervous system (CNS) tumors (atypical teratoid rhabdoid tumors, CNS embryonal tumors not otherwise specified, pineoblastoma, embryonal tumor with multilayered rosettes, and CNS sarcoma) treated over a 12-year period with repeated cycles of HDMTX followed by etoposide, cisplatin, cyclophosphamide, and vincristine. RESULTS: Six patients (46.2%) had disseminated disease at presentation and five (38.5%) had gross total resection. A total of 64 courses of therapy were administered with a median of five courses per patient. Eight patients (61.5%) received radiation therapy (one at relapse). By completion of therapy, 11 patients (84.6%) achieved a response (six complete, five partial). Six of the 13 patients (46.2%) remain alive with a median follow-up of 48 months (6-146). Acute toxicities included fever/neutropenia (70.3%), bacteremia (15.6%), and grade 3 mucositis (18.8%). Long-term complications included learning disability, seizure disorder, and brain necrosis, without treatment-related deaths. CONCLUSIONS: DIMAC with HDMTX without HDCSCR may be an effective treatment option for selected patients with embryonal or high-grade CNS tumors.
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Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Neoplasias del Sistema Nervioso Central/tratamiento farmacológico , Neoplasias del Sistema Nervioso Central/patología , Niño , Preescolar , Cisplatino/administración & dosificación , Ciclofosfamida/administración & dosificación , Relación Dosis-Respuesta a Droga , Etopósido/administración & dosificación , Femenino , Estudios de Seguimiento , Humanos , Lactante , Masculino , Clasificación del Tumor , Estudios Retrospectivos , Tasa de Supervivencia , Vincristina/administración & dosificaciónRESUMEN
BACKGROUND: We investigated tolerability and effectiveness of generic, less expensive direct antiviral drugs in the treatment of hepatitis C virus genotype 4 (HCV GT-4) in an Egyptian cohort. PATIENTS AND METHODS: Retrospectively, we analysed data from 648 patients with HCV GT4 attending Alexandria Main University Hospital from January 2016 to May 2017 [488 treatment naïve/160 treatment-experienced/288 with chronic hepatitis/360 with cirrhosis]. Patients received generic sofosbuvir/ledipasvir (n = 168, treatment naïve = 136, treatment-experienced = 32) or sofosbuvir/daclatasvir (n = 480, treatment naïve = 352, treatment-experienced = 128) ± ribavirin. We assessed sustained virologic response 12 weeks after treatment, non-response, relapse, treatment discontinuation and drug adverse reactions. RESULTS: An overall sustained virologic response 12 weeks after treatment was achieved in 97.8%, non-response in 0.6%, relapse in 0.3% and discontinuation of treatment in 1.3% of patients. Sofosbuvir/ledipasvir ± ribavirin regimen attained an overall sustained virologic response 12 weeks after treatment in 96.4% of patients (100% of treatment-experienced vs 95.6% of treatment naïve, P = 0.28), vs 98.3% for sofosbuvir/daclatasvir ± ribavirin regimen (100% of treatment-experienced vs 97.7% of treatment naïve, P = 0.08). No severe drug adverse events or deaths were reported except anaemia due to ribavirin. CONCLUSION: Generic direct antiviral drugs used in treating Egyptian patients with HCV GT-4 demonstrated equal potency, safety and tolerability compared to original brands, with low cost which would help to provide treatment to a larger scale of patients.
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Antivirales/administración & dosificación , Medicamentos Genéricos/administración & dosificación , Hepatitis C Crónica/complicaciones , Hepatitis C Crónica/tratamiento farmacológico , Cirrosis Hepática/tratamiento farmacológico , Adulto , Antivirales/efectos adversos , Bencimidazoles/administración & dosificación , Bencimidazoles/efectos adversos , Carbamatos , Quimioterapia Combinada , Medicamentos Genéricos/efectos adversos , Egipto , Femenino , Fluorenos/administración & dosificación , Fluorenos/efectos adversos , Hepacivirus/genética , Hepatitis C Crónica/virología , Humanos , Imidazoles/administración & dosificación , Imidazoles/efectos adversos , Modelos Logísticos , Masculino , Persona de Mediana Edad , Análisis Multivariante , Pirrolidinas , Estudios Retrospectivos , Ribavirina/administración & dosificación , Ribavirina/efectos adversos , Sofosbuvir , Respuesta Virológica Sostenida , Uridina Monofosfato/administración & dosificación , Uridina Monofosfato/efectos adversos , Uridina Monofosfato/análogos & derivados , Valina/análogos & derivadosRESUMEN
The naked neck gene was introduced by crossbreeding into Egyptian breeds to improve body weight. Expression levels of HSP70 and CPT-1 were used to assess the heat tolerance of three Egyptian local breeds (Fayoumi, Dandarawi and Sinai) with and without the naked neck gene and under normal and heat stress conditions. There were two genotypes from each breed that had the same genetic origin (the naked neck and normal plumage genotypes). For each genotype, chicks were divided into two groups, a control group and a treated group. Chicks in the treated group were subjected to heat stress (40⯰C) for four hours when they were between 3 and 5 days old. This treatment was associated with a highly significant increase in HSP70 and CPT-1 gene expression for the Dandarawi breed compared to the levels in the Fayoumi and Sinai breeds. Moreover, the introduction of the naked neck gene into these local breeds caused marked increases in CPT-1 gene expression, but these increases did not significantly differ among different naked neck genotypes. Therefore, it could be concluded that the Dandarawi breed exhibited the best heat tolerance, followed by the Sinai breed, whereas the Fayoumi breed was inferior in this respect. Furthermore, the naked neck gene improved heat tolerance by increasing HSP70 gene expression rather than only by reducing feather cover. The results obtained recommended using the Sinia naked neck chicken as a male line in commercial parent stock to produce broiler chicks adapted to the hot and warm climates.
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Proteínas Aviares/fisiología , Carnitina O-Palmitoiltransferasa/fisiología , Pollos/fisiología , Proteínas HSP70 de Choque Térmico/fisiología , Calor , Termotolerancia/fisiología , Animales , Expresión Génica , Genotipo , MasculinoRESUMEN
1. A study was conducted to evaluate the relationship among physical and mechanical properties of the eggshell, as affected by breed and hen's age. 2. Data on eggshell quality (external characteristics and derived measurements) were obtained from 322 laying hens, from three breeds (Fayoumi, Dandarawi and Hy-Line Brown) during the laying cycle, starting from 38 wks of age for four experimental periods (38, 46, 54 and 62 wks). 3. Eggs obtained from the Fayoumi breed exhibited the highest shell thickness and breaking force. There was a linear improvement in eggshell quality attributes associated with hen's age up to 54 wks, thereafter a deterioration was found for all breeds. 4. Generally, eggs laid by native breeds (Fayoumi and Dandarawi) had better mechanical properties compared to those produced by the commercial strain (Hy-Line Brown). In addition, the interaction between breed and hen's age was not significant for any physical property or mechanical attribute. There was a highly significant (P ≤ 0.01) positive correlation between the breaking force and either eggshell toughness or shell thickness, and regression analyses suggested that eggshell toughness was the best predictor for breaking force, followed by shell thickness.
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Pollos/fisiología , Cáscara de Huevo/fisiología , Factores de Edad , Animales , Fenómenos Biomecánicos , Fenómenos Biofísicos , Cruzamiento , Pollos/genética , Modelos BiológicosRESUMEN
Fluvoxamine is recommended as first-line treatment for a number of obsessive-compulsive disorders, anxiety disorders, social phobia, and post-traumatic stress disorder and panic disorder. The adverse effects of prolonged oral administration of fluvoxamine on haematology, biochemical parameters and fertility in male rats were evaluated in this study. Sixty adult male rats were allocated into 5 equal groups and orally treated with fluvoxamine 9 mg kg-1 b.wt. (low therapeutic dose, LTD) and 27 mg kg-1 b.wt. (high therapeutic dose, HTD), while the control rats received 0.5 ml distilled water for a period of 8 weeks. The 4th and 5th groups were gavaged with LTD and HTD of fluvoxamine for 8 weeks and then left untreated for another 8 weeks (recovery groups). HTD of fluvoxamine induced leukocytosis, lymphocytosis and monocytosis. LTD and HTD of fluvoxamine evoked hepatic, renal and cardiac dysfunction. Moreover, fluvoxamine treatment might lead to the risk of male infertility, which is indicated by its deleterious impacts on spermiogram and steroidogenesis hormones. They also induced oxidative stress, apoptosis in testicular tissue. Fortunately, the previous alterations were mostly reversed during the recovery period.
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Fertilidad/efectos de los fármacos , Fluvoxamina/efectos adversos , Inhibidores Selectivos de la Recaptación de Serotonina/efectos adversos , Administración Oral , Alanina Transaminasa/sangre , Animales , Análisis Químico de la Sangre , Fragmentación del ADN , Relación Dosis-Respuesta a Droga , Fluvoxamina/administración & dosificación , Hormonas Esteroides Gonadales/sangre , Leucocitosis/inducido químicamente , Masculino , Estrés Oxidativo/efectos de los fármacos , Ratas , Inhibidores Selectivos de la Recaptación de Serotonina/administración & dosificación , Espermatozoides/efectos de los fármacos , Testículo/efectos de los fármacos , Testículo/metabolismo , Testículo/patologíaRESUMEN
HER1 and HER2 are frequently overexpressed in human tumors where they drive cellular proliferation. For this reason they are considered important targets in anticancer therapy with dual HER1/HER2 inhibitors being recently approved and marketed. In this paper we report the identification of a series of compounds with anticancer activity by a combined virtual screening approach on the kinase domains of HER1 and HER2. 6 hit compounds that present a sub- or low-micromolar activity in two cell-based assays, were initially identified and a subsequent design cycle led to the synthesis of a compound with nanomolar activity in the cell-based assays.
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Antineoplásicos/química , Antineoplásicos/farmacología , Receptores ErbB/antagonistas & inhibidores , Inhibidores de Proteínas Quinasas/química , Inhibidores de Proteínas Quinasas/farmacología , Receptor ErbB-2/antagonistas & inhibidores , Neoplasias de la Mama/tratamiento farmacológico , Neoplasias de la Mama/enzimología , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Diseño Asistido por Computadora , Ensayos de Selección de Medicamentos Antitumorales/métodos , Receptores ErbB/química , Femenino , Humanos , Modelos Moleculares , Receptor ErbB-2/químicaRESUMEN
Possibilities of predicting eggshell ultrastructure from direct non-destructive and destructive measurements were examined using 120 Fayoumi eggs collected from the flock at 45 weeks of age. The non-destructive measurements included weight, length and width of the egg. The destructive measurements were breaking strength and shell thickness. The eggshell ultrastructure traits involved the total thickness of eggshell layer, thickness of palisade layer, cone layer and total score. Prediction of total thickness of eggshell layer based on non-destructive measurements individually or simultaneously was not possible (R(2) = 0.01 to 0.16). The destructive measurements were far more accurate than the non-destructive in predicting total thickness of eggshell layer. Prediction based on breaking strength alone was more accurate (R(2) = 0.85) than that based on shell thickness alone (R(2) = 0.72). Adding shell thickness to breaking strength (the best predictor) increased the accuracy of prediction by 5%. The results obtained indicated that both non-destructive and destructive measurements were not useful in predicting the cone layer (R(2) not exceeded 18%). The maximum accuracy of prediction of total score (R(2) = 0.48) was obtained from prediction based on breaking strength alone. Combining shell thicknesses and breaking strength into one equation was no help in improving the accuracy of prediction.
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This study explores the dynamical rotary motion of a charged axisymmetric spinning rigid body (RB) under the effect of a gyrostatic moment (GM). The influence of transverse and invariable body fixed torques (IBFTs), and an electromagnetic force field, is also considered. Euler's equations of motion (EOM) are utilized to derive the regulating system of motion for the problem in a suitable formulation. Due to the lack of torque exerted along the spin axis and the nearly symmetrical nature of the RB, the spin rate is nearly unchanged. Assuming slight angular deviations of the spin axis relative to a fixed direction in space, it is possible to derive approximate analytical solutions (AS) in closed form for the attitude, translational, and rotational movements. These concise solutions that are expressed in complex form are highly effective in analyzing the maneuvers performed by spinning RBs. The study focuses on deriving the AS for various variables including angular velocities, Euler's angles, angular momentum, transverse displacements, transverse velocities, axial displacement, and axial velocity. The graphical simulation of the subsequently obtained solutions is presented to show their precision. Furthermore, the positive impacts that alterations in the body's parameters have on the motion's behavior are presented graphically. The corresponding phase plane curves, highlighting the influence of different values in relation to the electromagnetic force field, the GM, and the IBFTs are drawn to analyze the stability of the body's motion. This study has a significant role in various scientific and engineering disciplines. Its importance lies in its ability to optimize mechanical systems, explain celestial motion, and enhance spacecraft performance.
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This paper aims to explore the rotatory spatial motion of an asymmetric rigid body (RB) under constant body-fixed torques and a nonzero first component gyrostatic moment vector (GM). Euler's equations of motion are used to derive a set of dimensionless equations of motion, which are then proposed for the stability analysis of equilibrium points. Specifically, this study develops 3D phase space trajectories for three distinct scenarios; two of them are applied constant torques that are directed on the minor and major axes, while the third one is the action of applied constant torque on the body's middle axis. Novel analytical and simulation results for both scenarios of constant torque applied along the minor and middle axes are provided in the context of separatrix surfaces, equilibrium manifolds, periodic or non-periodic solutions, and periodic solutions' extreme. Concerning the scenario of a directed torque on the major axis, a numerical solution for the problem is presented in addition to a simulation of the graphed results for the angular velocities' trajectories in various regions. Moreover, the influence of GM is examined for each case and a full modeling for the body's stability has been present. The exceptional impact of these results is evident in the development and assessment of systems involving asymmetric RBs, such as satellites and spacecraft. It may serve as a motivating factor to explore different angles within the GM in similar cases, thereby influencing various industries, including engineering and astrophysics applications.
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A historical overview of the evolution of anterolateral approaches to the lumber spine and associated patient outcomes is presented. In addition, the modern incorporation of new technologies is discussed, including interbody cages, intraoperative image guidance, robotics, augmented reality, and machine learning, which have significantly improved the spine surgery safety and efficacy profile. Current challenges and future directions are also covered, emphasizing the need for further research and development, particularly in robotic assistance and machine learning algorithms.
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Vértebras Lumbares , Aprendizaje Automático , Humanos , Vértebras Lumbares/cirugíaRESUMEN
The compounds 2',3',4',6'-tetra-O-acetyl-ß-d-gluco-pyranosyl N'-cyano-N-phenyl-carbamimido-thio-ate (C22H25N3O9S, 5a), 2',3',4',6'-tetra-O-acetyl-ß-d-galacto-pyranosyl N'-cyano-N-phenyl-carbamimido-thio-ate, (C22H25N3O9S, 5b), 2',3',4',6'-tetra-O-acetyl-ß-d-galacto-pyranosyl N'-cyano-N-methyl-carbamimido-thio-ate (C17H23N3O9S, 5c), and 2',3',4',6'-tetra-O-acetyl-ß-d-galacto-pyranosyl N'-cyano-N-p-tolyl-carbamimido-thio-ate (C23H27N3O9S, 5d) all crystallize in P212121 with Z = 4. For all four structures, the configuration across the central (formal) C=N(CN) double bond of the carbamimido-thio-ate group is Z. The torsion angles C5-O1-C1-S (standard sugar numbering) are all close to 180°, confirming the ß position of the substituent. Compound 5b involves an intra-molecular hydrogen bond N-Hâ¯O1; in 5c this contact is the weaker branch of a three-centre inter-action, whereas in 5a and 5d the Hâ¯O distances are much longer and do not represent significant inter-actions. The C-N bond lengths at the central carbon atom of the carbamimido-thio-ate group are almost equal. All C-O-C=O torsion angles of the acetyl groups correspond to a synperiplanar geometry, but otherwise all four mol-ecules display a high degree of conformational flexibility, with many widely differing torsion angles for equivalent groups. In the crystal packing, 5a, 5c and 5d form layer structures involving the classical hydrogen bond N-Hâ¯Ncyano and a variety of 'weak' hydrogen bonds C-Hâ¯O or C-Hâ¯S. The packing of 5b is almost featureless and involves a large number of borderline 'weak' hydrogen bonds. In an appendix, a potted history of wavelength preferences for structure determination is presented and it is recommended that, even for small organic crystals in non-centrosymmetric space groups, the use of Mo radiation should be considered.
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Art in neurosurgery has been a critical part of the discipline for centuries. Numerous cultures, such as ancient India, China, and Egypt, and more contemporary scientists, such as Leonardo da Vinci, Max Brödel, and Norman Dott, have significantly contributed to medical illustration. Today, advancements in three-dimensional technology have allowed for the creation of detailed neuroanatomy models for surgical planning and education. Medical illustrations are also used for research and outcome documentation as they help visualize anatomy and surgical procedures. Its use in education, surgical planning, and navigation remains integral to the advancement of neurosurgery. This review demonstrates the invaluable contribution of art in neurosurgery and how it has enabled continuous progress in the field.
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Ilustración Médica , Neurocirugia , Humanos , Ilustración Médica/historia , Neurocirugia/historia , Procedimientos Neuroquirúrgicos/historia , Neuroanatomía/historia , ChinaRESUMEN
BACKGROUND: To compare donor and recipient outcomes in patients with renal artery and ante-aortic renal vein vs unusual renal vascular anatomy undergoing laparoendoscopic single-site donor nephrectomy (LESSDN). METHODS: A retrospective chart review of the comparative study of donor and recipient outcomes of LESSDN in donors with venous abnormality (n = 28, group A), arterial abnormality (n = 74, group B), and standard donors (n = 248, group C). RESULTS: From September 2016 to August 2022, 350 left LESSDN were performed. The most common anomalies in group A were the retro-aortic and 2 renal veins in 12 patients each. In group B, 72 and 2 patients had 2 and 3 renal arteries, respectively. Operative and warm ischemia times were significantly longer in donors with vascular anomalies. Moreover, patient creatinine on discharge was significantly higher in arterial anomalies; it was 1.61 ± 0.22 compared with 1.26 ± 0.43 and 1.25 ± 0.32 mg/dL for patients with no anomalies and venous anomalies, respectively (P < .001). However, serum creatinine levels recovered after 1 month and were comparable between the study groups. Recipients, operative time, and vascular anastomosis time were significantly longer in recipients with vascular anomaly. Slow graft function was higher in group B (6.9%) than in the other groups. One-year graft survival rates were 96.4%, 94.6%, and 97.1% (P = .496). CONCLUSION: With increased experience, LESSDN in multiple renal arteries and uncommon venous anatomy cases is feasible and safe. Moreover, it does not influence donor or recipient outcomes.
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Trasplante de Riñón , Laparoscopía , Humanos , Nefrectomía/efectos adversos , Nefrectomía/métodos , Estudios Retrospectivos , Trasplante de Riñón/efectos adversos , Trasplante de Riñón/métodos , Donadores Vivos , Laparoscopía/efectos adversos , Laparoscopía/métodos , Recolección de Tejidos y Órganos/efectos adversos , Resultado del TratamientoRESUMEN
OBJECTIVES: Lymphocele formation after kidney transplant is a common complication that causes significant morbidity. In this study, we aimed to evaluate the safety and effectiveness of intraoperative prophylactic povidone-iodine sclerotherapy through the closed suction drain to prevent lymphocele after kidney transplant. MATERIALS AND METHODS: In this retrospective comparative single-institution study, we compared patients who underwent intraoperative prophylactic povidone-iodine sclerotherapy through the closed suction drain (group A) with patients who did not receive sclerotherapy (group B). Patients were treated between September 2017 and July 2023. Atthe end of the kidney transplant surgery, after the closure of the external oblique muscle layer and before skin closure, 10 mL of 10% povidone-iodine in 40 mL of normal saline were instilled via the closed suction drain and dwelled in the cavity for 30 minutes. RESULTS: During the study period, 300 living-related donor kidney transplants were performed. Prophylactic povidone-iodine sclerotherapy was performed in 150 patients (50%).We noted a significantly lower incidence of lymphorrhea and lymphocele in group A. On postoperative days 1 and 5, we noted a significant reduction in drain output in group A (P < .001). One patient in group A and 5 patients in group B required ultrasonography-guideddrainage andpovidone-iodine sclerotherapy. No sclerotherapy-related complications were reported after a median follow-up of 16 months (range, 3-29 months). CONCLUSIONS: Intraoperative prophylactic povidoneiodine sclerotherapy appears to be an easy, safe, and effective procedure for preventing lymphatic complications after living donor kidney transplant.