ABSTRACT
Diabetic retinopathy (DR) remains a major complication of diabetes and a leading cause of blindness among adults worldwide. DR is a progressive disease affecting both type I and type II diabetic patients at any stage of the disease, and targets the retinal microvasculature. DR results from multiple biochemical, molecular and pathophysiological changes to the retinal vasculature, which affect both microcirculatory functions and ultimately photoreceptor function. Several neural, endothelial, and support cell (e.g., pericyte) mechanisms are altered in a pathological fashion in the hyperglycemic environment during diabetes that can disturb important cell surface components in the vasculature producing the features of progressive DR pathophysiology. These include loss of the glycocalyx, blood-retinal barrier dysfunction, increased expression of inflammatory cell markers and adhesion of blood leukocytes and platelets. Included in this review is a discussion of modifications that occur at or near the surface of the retinal vascular endothelial cells, and the consequences of these alterations on the integrity of the retina.
ABSTRACT
INTRODUCTION: Training clinical skills is essential in medicine. Different models of clinical skills courses have been previously suggested. Here, we report an innovative approach adopted to train junior medical students in clinical skills in a multimodal fashion by near-peers, basic scientists with clinical background and senior clinicians. METHODS: This quasi-experimental study was conducted at Alfaisal University College of Medicine at Riyadh. An electronic survey was conducted among year-2 and year-3 medical students seeking their perception about the (a) organization, (b) delivery, (c&d) self- and peer-assessment in clinical skills courses. Total 298 male and female medical students (91%), consisting of 164 from year 2 and 134 from year 3, participated by filling out a questionnaire (Cronbach's alpha 0.93). RESULTS: Out of maximum five, the average ratings for the course were 3.81, 3.72, 3.67 and 3.73 in organization, delivery, self-evaluation and peer-assessment respectively, with no significant difference between both subgroups. The in-campus sessions rated higher than hospital sessions (p < 0.001). As tutors, interns were rated higher than clinicians (p < 0.001). The qualitative analysis suggested high satisfaction. CONCLUSIONS: The clinical skills course that was conducted in a multimodal fashion utilizing diverse tutors showed a positive attitude of students toward the organization and delivery of the course.
Subject(s)
Clinical Competence , Education, Medical, Undergraduate/methods , Peer Group , Students, Medical , Humans , LearningABSTRACT
Postoperative alopecia has been reported as a rare complication after prolonged immobilization during general anesthesia. The constant pressure on the scalp is causative and may be exacerbated by hypoxemia or hypotension. There is a correlation between the length surgery duration under anesthesia and the development of permanent alopecia. Regular head turning schedules and vigilance for the condition should be used as prophylaxis to prevent permanent alopecia.
ABSTRACT
Today we are beginning to understand how phytochemicals can influence metabolism, cellular signaling and gene expression. The hydroxybenzoic acids are related to salicylic acid and salicin, the first compounds isolated that have a pharmacological activity. In this review we examine how a number of hydroxyphenolics have the potential to ameliorate cardiovascular problems related to aging such as hypertension, atherosclerosis and dyslipidemia. The compounds focused upon include 2,3-dihydroxybenzoic acid (Pyrocatechuic acid), 2,5-dihydroxybenzoic acid (Gentisic acid), 3,4-dihydroxybenzoic acid (Protocatechuic acid), 3,5-dihydroxybenzoic acid (α-Resorcylic acid) and 3-monohydroxybenzoic acid. The latter two compounds activate the hydroxycarboxylic acid receptors with a consequence there is a reduction in adipocyte lipolysis with potential improvements of blood lipid profiles. Several of the other compounds can activate the Nrf2 signaling pathway that increases the expression of antioxidant enzymes, thereby decreasing oxidative stress and associated problems such as endothelial dysfunction that leads to hypertension as well as decreasing generalized inflammation that can lead to problems such as atherosclerosis. It has been known for many years that increased consumption of fruits and vegetables promotes health. We are beginning to understand how specific phytochemicals are responsible for such therapeutic effects. Hippocrates' dictum of 'Let food be your medicine and medicine your food' can now be experimentally tested and the results of such experiments will enhance the ability of nutritionists to devise specific health-promoting diets.
