http://www.handwrittentutorials.com - This tutorial explores the Renin-Angiotensin-Aldosterone System, its role in Blood Pressure, the enzymes, involved, and how drugs act upon the system. For more entirely FREE medical tutorials visit http://www.handwrittentutorials.com
almost 7 years ago
The kidney is one of the most highly differentiated organs in the body. At the conclusion of embryologic development, nearly 30 different cell types form a multitude of filtering capillaries and segmented nephrons enveloped by a dynamic interstitium. This cellular diversity modulates a variety of complex physiologic processes. Endocrine functions, the regulation of blood pressure and intraglomerular hemodynamics, solute and water transport, acid-base balance, and removal of drug metabolites are all accomplished by intricate mechanisms of renal response. This breadth of physiology hinges on the clever ingenuity of nephron architecture that evolved as complex organisms came out of water to live on land.
about 5 years ago
More Anatomy Lessons : https://www.youtube.com/user/AnatomyProfStudent Anatomy video Anatomy vagin Anatomy penis Anatomy prof students Anatomy videos medical...
over 6 years ago
Introduction The use of smartphones amongst health care professionals is now estimated to be in excess of 85%, with Apple's iPhone currently being the most popular platform. There is a wealth of information (from popular blogs, to formal journals) that demonstrate the potential of smartphone apps (and technology in general) to improve healthcare. However, despite widespread use of smartphones, proper application of the software at our disposal has been arguably poor. The latest mobile Apple operating system 'iOS 8', may be the start of a long-awaited overhaul of the current health apps available. The App Store - as it stands The Apple app store boasts many hundreds of what it describes as 'medical' apps. A review of the 'Top 200' medical apps conducted in 2012 by this author revealed that 49% were in fact general health or lifestyle applications aimed at the general public. The same process was repeated this year (2014) and demonstrated that this percentage has increased to 54%. This increase in apps aimed at the general public suggests that Apple do not differentiate between 'medical apps' and 'health and lifestyle' apps. This could negatively affect health care professionals' perception of the otherwise high-quality medical apps that are available. In addition, of the remaining percentage of apps aimed at healthcare professionals, only 5.56% were deemed to be of clinical benefit (an increased from 3% in 2012). The overwhelming majority of 'medical' apps aimed at medical professionals are actually educational in content and usually focus on the learning of anatomy. Current health apps Much like the 'medical' apps, only a limited selection of the health apps that are aimed at the public/patient are deemed to be high-quality. Prominent examples include the blood glucose monitors that record data in to a smartphone and similarly, the blood pressure and pain diaries. These examples focus on people with medical conditions, but it is important to note the potential of apps in preventative medicine too (i.e. promoting general health). Typical high-quality apps in this category include RunKeeper and Map My Ride. These apps allow everyone to become their own personal trainer and keep an accurate record of their physical activity. Smartphones will even send reminders to the user that a workout is due, and the option is present to share your stats and 'compete' with friends/family via social media. These features highlight the absolute vanguard of what could potentially come in terms of technology influencing healthy living. A current criticism of health apps is that most (if not all) are individual enterprises with very little information shared between them. The metaphor of 'silos' is used to represent these large vessels of information that sit adjacent to one another whilst never benefiting from the contents of one another. The iOS 8 operating system hopes to ameliorate this current issue with its new Health app and HealthKit, which will enable developers and their apps to pull data from several health related apps into one streamlined app. It is envisaged that this app will be able to feed (with the appropriate permissions of course) health related information to your family physician for health monitoring purposes. This could have impressive effects in community blood pressure management and blood glucose management (just to name the obvious ones). Problems Ahead There are scattered anecdotal reports of users being wary of centralised health information and as always Data Protection is a major concern (whether it is warranted or not). In addition, whilst a large percentage of the population may have a smartphone many may still opt not to use health related apps. Poor uptake will obviously limit the perception of this medium as a method of health monitoring. Summary Smartphone usage is high and many healthcare related apps are already available either to serve as medical tools to healthcare professionals or health monitoring devices for the public. Currently, Apple does not seem to differentiate between medical and lifestyle apps on its app store and many lower quality apps seem to appear in 'medical' searches. Also, Current apps do not share information. However, with iOS 8 it seems that Apple seems to be addressing several key issues surrounding the use of the iPhone as a health monitoring device. For the moment it seems that healthcare professionals will have to harness this patient-held approach. Perhaps direct improvements to the medical aspect of the Apple app store and the quality and originality of apps aimed at doctors is still a little way off.
Dr. Luke Farmery
over 6 years ago
This month’s case is by David R Bell PhD, co-author of Medical Physiology: Principles for Clinical Medicine, 3e (ISBN: 9781451110395) For more information, or to purchase your copy, visit: http://tiny.cc/Rhoades4e, with 15% off using the discount code: MEDUCATION. The case below is followed by a quiz question, allowing you a choice of diagnoses. Select the one letter section that best describes the patient’s condition. The Case A 28-year old woman has an unremarkable pregnancy through her first 28 weeks of gestation, with normal weight gain and no serious complications. She has no previous history of diabetes, hypertension of other systemic disease before or during her current pregnancy. During her 30-week checkup, her blood pressure measures 128/85, and she complains about feeling slightly more “bloated” than usual with swelling in her legs that seems to get more uncomfortable as the day goes on. Her obsterician recommends that she get more bed rest, stay off her feet as much as possible and return for evaluation in one week. At the one-week follow-up, the patient presents with noticable”puffiness” in her face, and a blood pressure of 145/95. She complains she has been developing headaches, sporadic blurred vision, right-sided discomfort and some shortness of breath. She has gained more than 10 lb (4.5kg) in the past week. A urinalysis on the patient revelas no glucose but a 3+ reading for protein. Her obstetrician decides to admit her immediately to a local tertiary care hospital for further evaluation. Over the next 24 hours, the patient’s urine output is recorded as 500mL and contains 6.8 grams of protein. Her plasma albumin level is 3.1 g/dl, hemacrit 48%, indirect bilirubin 1.5mg/dl and blood platelets=77000/uL, respectively. Her blood pressure is now 190/100. It is decided to try to deliver the foetus. The expelled placenta is small and shows signs of widespread ischmic damage. Within a week of delivery, the mother’s blood pressure returns to normal, and her oedema subsides. One month later, the mother shows no ill effects of thos later-term syndrome. Question What is the clinical diagnosis of this patient’s condition and its underlying pathophysiology? A. Gestational Hypertension B. Preeclampsia C. Gestational Diabetes D. Compression of the Inferior Vena Cava Answer The correct answer is "B. Preeclampsia". The patient’s symptoms and laboratory findings are consistent with a diagnosis of Preeclampsia, which is a condition occurring in some pregnancies that causes life-threatening organ and whole body regulatory malfunctions. The patient’s negative urine glucose is inconsistent with gestational diabetes. Gestational hypertension or vena caval compression cannot explain all of the patient findings. The patient has three major abnormal findings- generalised oedema, hypertension and proteinuria which are all common in preeclampsia. Although sequalae of a normal pregnancy can include water and salt retention, bloating, modest hypertension and leg swelling (secondary to capillary fluid loss from increased lower limb capillary hydrostatic pressure due to compression of the inferior vena cava by the growing foetus/uterus), oedema in the head and upper extremities, a rapid 10 pound weight gain and shortness of breath suggests a generalized and serious oedematous state. The patient did not have hypertension before or within 20 weeks gestation (primary hypertension) and did not develop hypertension after the 20th week of pregnancy with no other abnormal findings (gestational hypertension). Hypertension with proteinuria occurring beyond the 20th week of pregnancy however is a hallmark of preeclampsia. In addition, the patient has hemolysis (elevated bilirubin and LDH levels), elevated liver enzyme levels and thrombocytopenia. This is called the HELLP syndrome (HELLP = Hemolysis, Elevated Liver enzymes and Low Platelets.), and is considered evidence of serious patient deterioration in preeclampsia. A urine output of 500 ml in 24 hours is 1/2 to 1/4 of normal output in a hydrated female and indicates renal insufficiency. Protein should never be found in the urine and indicates loss of capillaries integrity in glomeruli which normally are not permeable to proteins. The patient has substantial 24 urine protein loss and hypoalbuminemia. However, generally plasma albumin levels must drop below 2.5 gm/dl to decrease plasma oncotic pressure enough to cause general oedema. The patient’s total urinary protein loss was insufficient in this regard. Capillary hyperpermeability occurs with preeclampsia and, along with hypertension, could facilitate capillary water efflux and generalized oedema. However myogenic constriction of pre-capillary arterioles could reduce the effect of high blood pressure on capillary water efflux. An early increase in hematocrit in this patient suggests hemoconcentration which could be caused by capillary fluid loss but the patient’s value of 48 is unremarkable and of little diagnostic value because increased hematocrit occurs in both preeclampsia and normal pregnancy. PGI2, PGE2 and NO, produced during normal pregnancy, cause vasorelaxation and luminal expansion of uterine arteries, which supports placental blood flow and development. Current theory suggests that over production of endothelin, thromboxane and oxygen radicals in preeclampsia antagonize vasorelaxation while stimulating platelet aggregation, microthrombi formation and endothelial destruction. These could cause oedema, hypertension, renal/hepatic deterioration and placental ischemia with release of vasotoxic factors. The patient’s right-sided pain is consistent with liver pathology (secondary to hepatic DIC or oedematous distention). Severe hypertension in preeclampsia can lead to maternal end organ damage, stroke, and death. Oedematous distension of the liver can cause hepatic rupture and internal hemorrhagic shock. Having this patient carry the baby to term markedly risks the life of the mother and is not considered current acceptable clinical practice. Delivery of the foetus and termination of the pregnancy is the only certain way to end preeclampsia. Read more This case is by David R Bell PhD, co-author of Medical Physiology: Principles for Clinical Medicine, 3e (ISBN: 9781451110395) For more information, or to purchase your copy, visit: http://tiny.cc/Rhoades4e. Save 15% (and get free P&P) on this, and a whole host of other LWW titles at (lww.co.uk)[http://lww.co.uk] when you use the code MEDUCATION when you check out! About LWW/ Wolters Kluwer Health Lippincott Williams and Wilkins (LWW) is a leading publisher of high-quality content for students and practitioners in medical and related fields. Their text and review products, eBooks, mobile apps and online solutions support students, educators, and instiutions throughout the professional’s career. LWW are proud to partner with Meducation.
Lippincott Williams & Wilkins
almost 8 years ago
Shattered. Third consecutive day of on-calls at the birth centre. I’m afraid I have little to show for it. The logbook hangs limply at my side, the pages where my name is printed await signatures; surrogate markers of new found skills. Half asleep I slump against the wall and cast my mind back to the peripheral attachment from which I have not long returned. The old-school consultant’s mutterings are still fresh: “Medical education was different back then you see....you are dealt a tough hand nowadays.” I quite agree, it is Saturday. Might it be said the clinical apprenticeship we know today is a shadow of its former self? Medical school was more a way of life, students lived in the hospital, they even had their laundry done for them. Incredulous, I could scarcely restrain a chuckle at the consultant’s stories of delivering babies while merely a student and how the dishing out of “character building” grillings by their seniors was de rigeur. Seldom am I plied with any such questions. Teaching is a rare commodity at times. Hours on a busy ward can bear little return. Frequently do I hear students barely a rotation into their clinical years, bemoan a woeful lack of attention. All recollection of the starry-eyed second year, romanced by anything remotely clinical, has evaporated like the morning dew. “Make way, make way!...” cries a thin voice from the far reaches of the centre. A squeal of bed wheels. The newly crowned obs & gynae reg drives past the midwife station executing an impressive Tokyo drift into the corridor where I stand. Through the theatre doors opposite me he vanishes. I follow. Major postpartum haemorrhage. A bevy of scrubs flit across the room in a live performance of the RCOG guidelines for obstetric haemorrhage. They resuscitate the women on the table, her clammy body flat across the carmine blotched sheets. ABC, intravenous access and a rapid two litres of Hartmann’s later, the bleeding can not be arrested by rubbing up contraction. Pharmacological measures: syntocinon and ergometrine preparations do not staunch the flow. Blood pressure still falling, I watch the consciousness slowly ebb from the woman’s eyes. Then in a tone of voice, seemingly beyond his years, the reversely gowned anaesthetist clocks my badge and says, “Fetch me the carboprost.” I could feel an exercise in futility sprout as I gave an empty but ingratiating nod. “It’s hemabate....in the fridge” he continues. In the anaesthetic room I find the fridge and rummage blindly through. Thirty seconds later having discovered nothing but my general inadequacy, I crawl back into theatre. I was as good as useless though to my surprise the anaesthetist disappeared and returned with a vial. Handing me both it and a prepped syringe, he instructs me to inject intramuscularly into the woman’s thigh. The most common cause of postpartum haemorrhage is uterine atony. Prostaglandin analogues like carboprost promote coordinated contractions of the body of the pregnant uterus. Constriction of the vessels by myometrial fibres within the uterine walls achieves postpartum haemostasis. This textbook definition does not quite echo my thoughts as I gingerly approach the operating table. Alarmingly I am unaware that aside from the usual side effects of the drug in my syringe; the nausea and vomiting, should the needle stray into a nearby vessel and its contents escape into the circulation, cardiovascular collapse might be the unfortunate result. Suddenly the anaesthetist’s dour expression as I inject now assumes some meaning. What a relief to see the woman’s vitals begin to stabilise. As we wheel her into the recovery bay, the anaesthetist unleashes an onslaught of questions. Keen to redeem some lost pride, I can to varying degrees, resurrect long buried preclinical knowledge: basic pharmacology, transfusion-related complications, the importance of fresh frozen plasma. Although, the final threat of drawing the clotting cascade from memory is a challenge too far. Before long I am already being demonstrated the techniques of regional analgesia, why you should always aspirate before injecting lidocaine and thrust headlong into managing the most common adverse effects of epidurals. To have thought I had been ready to retire home early on this Saturday morning had serendipity not played its part. A little persistence would have been just as effective. It’s the quality so easily overlooked in these apparently austere times of medical education. And not a single logbook signature gained. Oh the shame! This blog post is a reproduction of an article published in the Medical Student Newspaper, February 2014 issue.
almost 7 years ago
Learn auscultation. Reference guides for heart and lungs sounds. Taking blood pressure tutorial and drills.
about 6 years ago
In the USA the issue of indiscriminate use of expensive, sophisticated, and time consuming test in lieu of, rather than in addition to, the clinical exam is being much discussed. The cause of this problem is of course multifactorial. One of the factors is the decline of the teaching of clinical skills to our medical students and trainees. Such problems seem to have taken hold in developing countries as well. Two personal anecdotes will illustrate this. In the early nineties I worked for two years as a faculty member in the department of ob & gyn at the Aga Khan University Medical School in Karachi, Pakistan. One day, I received a call from the resident in the emergency room about a woman who had come in because of some abdominal pain and vaginal bleeding. While the resident told me these two symptoms her next sentence was: “… and the pelvic ultrasound showed…” I stopped her right in her tracks before she could tell me the result of the ultrasound scan. I told her: “First tell me more about this patient. Does she look ill? Is she bleeding heavily? Is she in a lot of pain and where is the pain? What are her blood pressure and pulse rate? How long has she been having these symptoms? When was her last menstrual period? What are your findings when you examined her ? What is the result of the pregnancy test?”. The resident could not answer most of these basic clinical questions and findings. She had proceeded straight to a test which might or might not have been necessary or even indicated and she was not using her clinical skills or judgment. In another example, the resident, also in Karachi, called me to the emergency room about a patient with a ruptured ectopic pregnancy. He told me that the patient was pale, and obviously bleeding inside her abdomen and on the verge of going into shock. The resident had accurately made the diagnosis, based on the patient’s history, examination, and a few basic laboratory tests. But when I ran down to see the patient, he was wheeling the patient into the radiology department for an ultrasound. "Why an ultrasound?" I asked. “You already have made the correct diagnosis and she needs an urgent operation not another diagnostic procedure that will take up precious time before we can stop the internal bleeding.” Instead of having the needless ultrasound, the patient was wheeled into the operating room. What I am trying to emphasize is that advances in technology are great but they need to be used judiciously and young medical students and trainees need to be taught to use their clinical skills first and then apply new technologies, if needed, to help them to come to the right diagnosis and treatment. And of course we, practicing physicians need to set the example. Or am I old fashioned and not with it? Medico legal and other issues may come to play here and I am fully aware of these. However the basic issue of clinical exam is still important. Those wanting to read more similar stories can download a free e book from Smashwords. The title is: "CROSSCULTURAL DOCTORING. ON AND OFF THE BEATEN PATH." You can access the e book here.
DR William LeMaire
over 6 years ago
Orthostatic hypotension due to autonomic dysfunction: midodrine | Key-points-from-the-evidence | Advice | NICE
Two randomised controlled trials (RCTs) (n=171 and n=97) found that midodrine significantly increased standing blood pressure 1 hour post‑dose compared with placebo in people with symptomatic orthostatic hypotension due to autonomic dysfunction. There was also limited evidence that midodrine improved some symptoms of orthostatic hypotension, such as syncope (fainting) and low energy levels. However, results for other symptoms such as light‑headedness and dizziness were less positive, and the studies did not assess quality of life, falls or ability to carry out daily activities.
about 5 years ago