By A. Kor-Shach. Siena College.
Similarly cheap levitra 10 mg with amex, reporting on treadmill evaluations of over 6 levitra 20mg line,000 men studied over a 6-year period cheap levitra 10mg with mastercard, Myers and coworkers (2002) concluded that “exer- cise capacity is a more powerful predictor of mortality among men than other established risk factors for cardiovascular disease. The vast majority of review articles have concluded that acute or chronic aerobic exercise is related to favorable changes in anxiety, depression, stress reactivity, positive mood, self-esteem, and cogni- tive functioning (Anthony, 1991; Craft and Landers, 1998; Landers and Arent, 2001; Mutrie, 2000; North et al. Although one reviewer (Mutrie, 2000) has argued for a causal relationship between exercise and the reduction of clinical depression, others suggest that there are not enough clinical trial studies to support a causal interpretation (Landers and Arent, 2001). Examination of the meta- analyses indicates that the overall magnitude of the effect of exercise on anxiety, depression, stress reactivity, and cognitive functioning ranges from small to moderate, but in all cases, these effects are statistically significant (Landers and Arent, 2001). These results are encouraging, but there is still much to learn before the relationship between physical activity and mental health can be fully understood. Recent reviews on endorphins (Hoffman, 1997), serotonin (Chaouloff, 1997), and norepinephrine (Dishman, 1997) have provided experimental evidence for potential mechanisms by which exercise can produce calming effects and mood enhancements. In general, Vo2max is related to body muscle mass and is a relatively constant value for a given individual but it can be altered by various factors, particularly aerobic training, which will induce a change of 10 to 20 per- cent. Thus, on an absolute basis, bigger individuals tend to have a larger Vo2max (measured in liters of O2 consumed/minute) than do smaller individuals. Hence, for purposes of comparison, Vo2max is frequently con- sidered in terms of mL/kg/min. However, a heart disease patient of the same body size might be capable of only a Vo2max of 0. Lipid is the main energy source in muscle and at the whole-body level during rest and mild intensity activity (Brooks and Mercier, 1994). As intensity increases, a shift from the predominant use of lipid to carbo- hydrate occurs. Figure 12-7 describes this crossover concept and, as can be seen in the figure, the relative use of fat is greatest at relatively low exercise intensities, particularly when individuals are fasting. Training slightly increases the relative use of fat as the energy source during low to moderate exercise intensities, particularly in the fasted state. In regard to the amount of fat oxidized, it must be considered that the energy output for a given percent of Vo2max is proportionally higher (in this case 50 percent) in trained rather than in untrained cyclists. However, at relatively high power outputs, substrate use crosses over to predominant use of carbohydrate energy sources regardless of training state or recent carbohydrate nutrition. To be used for energy generation, protein must first be degraded to amino acids before the carbon-hydrogen-oxygen skeleton can be used as an energy source through the pathways of carbohydrate and lipid metabo- lism, while the amino acid nitrogen is transferred and eliminated, primarily in the form of urea. The rate at which amino acids contribute to energy generation is fairly constant and does not increase nearly as much as glucose and fatty acid oxidation during periods of physical exertion. Indeed, using amino acids as a major energy source would be wasteful, since protein is the most limited energy yielding nutrient. Beyond the overriding effect of relative exercise intensity, other factors such as exer- cise duration, gender, training status, and dietary history play important, but secondary, roles in determining the pattern of substrate utilization (Brooks et al. Therefore, the same general relationships among relative exercise intensity, duration, and pattern of substrate utilization hold for most persons, including endurance athletes. Intensity of Physical Activity Oxidation of lipid provides most of the energy (~ 60 percent) for non- contracting skeletal muscle and overall for the body at rest in people who have not eaten for 10 to 12 hours (i. During mild exercise, the use of lipid increases, but if the level of effort increases, carbohydrate energy sources are used to a relatively greater extent (Figure 12-7). For exercises intensities greater than 50 percent of Vo2max, the oxidation of free fatty acids declines in muscle, both as a percentage of total energy as well as on an absolute basis. In other words, there is crossover from prevalence of lipid oxidation at rest and during mild exercise to predominance of carbohydrate energy sources during moderate and greater efforts. The main carbohydrate energy source is muscle glycogen, and this is supplemented to some extent by glucose and lactate—glucose mobilized from the liver and lactate produced by muscle glycogen breakdown. If exercise persists beyond 60 to 90 minutes, lipid use will rise as carbohydrate fuel sources become depleted. In this case, the intensity of exercise must drop because of the depletion of muscle glycogen, decreasing levels of blood glucose, and other fatiguing conse- quences of the effort (Graham and Adamo, 1999). Dietary carbohydrate is relatively rapidly assimilated compared to fat and protein, thus raising blood glucose and insulin levels. The increments in blood glucose and insulin in response to carbohydrate intake are less in trained than in untrained individuals (Dela et al. Hence, as shown in Figure 12-7 for fed individuals, crossover to predominant carbohydrate oxidation occurs already during mild (22% Vo2max) exercise, even in trained individuals, if they have recently consumed carbohydrates. Duration of Physical Activity Within seconds after initiation of even mild exercise, muscle glycogen stores are mobilized to provide energy for muscle work.
Docosahexaenoic acid ingestion inhibits natural killer cell activity and production of inflammatory mediators in young healthy men purchase 10 mg levitra with mastercard. A stearic acid- rich diet improves thrombogenic and atherogenic risk factor profiles in healthy males cheap 20 mg levitra visa. Dietary n-3 polyunsaturated fatty acids and amelioration of cardiovascular disease: Possible mechanisms cheap levitra 20mg free shipping. Fatty acids and eicosanoids regulate gene expression through direct interactions with peroxisome proliferator-activated receptors α and γ. Fatty acid composition of breast milk from three racial groups from Penang, Malaysia. Adipose tissue trans fatty acids and breast cancer in the European Community Multicenter Study on Antioxidants, Myocardial Infarction, and Breast Cancer. Trans fatty acids may impair biosynthesis of long-chain poly- unsaturates and growth in man. The role of fatty acid saturation on plasma lipids, lipoproteins, and apolipoproteins: I. Effects of whole food diets high in cocoa butter, olive oil, soybean oil, dairy butter, and milk chocolate on the plasma lipids of young men. Diet, prevalence and 10-year mortality from coronary heart disease in 871 middle-aged men. The inverse relation between fish consumption and 20-year mortality from coronary heart disease. Dietary saturated and trans fatty acids and cholesterol and 25-year mortality from coronary heart disease: The Seven Countries Study. Influence of dietary fat on the nutrient intake and growth of children from 1 to 5 y of age: The Special Turku Coronary Risk Factor Intervention Project. Maintenance of lower proportions of (n-6) eicosanoid precursors in phospholipids of human plasma in response to added dietary (n-3) fatty acids. Lapinleimu H, Viikari J, Jokinen E, Salo P, Routi T, Leino A, Rönnemaa R, Seppänen R, Välimäki I, Simell O. Prospective randomised trial in 1062 infants of diet low in saturated fat and cholesterol. Dietary fat in relation to body fat and intraabdominal adipose tissue: A cross- sectional analysis. Effect of dietary enrichment with eicosapentaenoic and docosahexaenoic acids on in vitro neutrophil and monocyte leukotriene generation and neutrophil function. Energy intake required to main- tain body weight is not affected by wide variation in diet composition. Lipid peroxidation in rat tissue slices: Effect of dietary vitamin E, corn oil-lard and mehaden oil. Assessment of trans-fatty acid intake with a food frequency questionnaire and validation with adipose tissue levels of trans-fatty acids. Effects of different forms of dietary hydrogenated fats on serum lipoprotein cholesterol levels. Platelet function, thromboxane formation and blood pressure control during supplementation of the Western diet with cod liver oil. A high-steric acid diet does not impair glucose tolerance and insulin sensitivity in healthy women. Randomised con- trolled trial of a synthetic triglyceride milk formula for preterm infants. Lucas A, Stafford M, Morley R, Abbott R, Stephenson T, MacFadyen U, Elias-Jones A, Clements H. Efficacy and safety of long-chain polyunsaturated fatty acid supplementation of infant-formula milk: A randomised trial. Dietary fiber, weight gain, and cardiovascular disease risk factors in young adults. Fatty acid composition of brain, retina, and erythrocytes in breast- and formula-fed infants. A randomized trial of different ratios of linoleic to α-linolenic acid in the diet of term infants: Effects on visual function and growth. A critical appraisal of the role of dietary long-chain polyunsaturated fatty acids on neural indices of term infants: A randomized controlled trial.
He received honoraria buy 10 mg levitra with mastercard, consulting fees generic levitra 10 mg line, editorship purchase levitra 20 mg on line, royalties, and paid to his institution and consulting income from Artisan Pharma/Asahi Data and Safety Monitoring Board membership fees paid to him from Bayer Kasei Pharma America Corp ($25,000–$50,000). His nonfnancial dis- closures include authorship of the position statement on fuid resuscitation Dr. Vincent reports consulting income paid to his institution from Astellas, Associates (soluble guanylate cyclase activator in acute respiratory distress AstraZeneca, Curacyte, Eli Lilly, Eisai, Ferring, GlaxoSmithKline, Merck, and syndrome/acute lung injury adjunct therapy to supportive care and ventila- Pfzer. His institution received honoraria on his behalf from Astellas, Astra- tion strategies), Eisai (eritoran), and Phillips (Respironics); he provided expert Zeneca, Curacyte, Eli Lilly, Eisai, Ferring, Merck, and Pfzer. He is the author Hearing), Eisai (eritoran through leader touch plan in Brussels), Eli Lilly of several manuscripts defning sepsis and stratifcation of the patient with (Lunchtime Symposium, Vienna), Covidien (adult monitoring advisory board sepsis. Severe sepsis and septic shock are major health- Severe sepsis is defned as sepsis plus sepsis-induced organ care problems, affecting millions of people around the world dysfunction or tissue hypoperfusion (Tables 1 and 2) (6). Similar to polytrauma, acute myocardial ment bundles, which are included, a distinction is made infarction, or stroke, the speed and appropriateness of therapy between defnitions and therapeutic targets or thresholds. Sep- administered in the initial hours after severe sepsis develops sis-induced hypotension is defned as a systolic blood pressure are likely to infuence outcome. Recommendations from these deviations below normal for age in the absence of other causes guidelines cannot replace the clinician’s decision-making capa- of hypotension. An example of a therapeutic target or typical bility when he or she is presented with a patient’s unique set of threshold for the reversal of hypotension is seen in the sepsis clinical variables. In fact, the committee believes that the greatest outcome be evident throughout this article. Septic shock is defned as improvement can be made through education and process sepsis-induced hypotension persisting despite adequate fuid change for those caring for severe sepsis patients in the non- resuscitation. The 2008 publication analyzed evidence available and feedback performance improvement initiatives, the guide- through the end of 2007. The most current iteration is based lines will infuence bedside healthcare practitioner behavior on updated literature search incorporated into the evolving that will reduce the burden of sepsis worldwide. This system classifes mation incorporated into the evolving manuscript through quality of evidence as high (grade A), moderate (grade B), low year-end 2011 and early 2012). Committees and the results, indirectness of the evidence, and possible reporting their subgroups continued work via phone and the Internet. Examples of indirectness of the evidence Several subsequent meetings of subgroups and key indi- include population studied, interventions used, outcomes viduals occurred at major international meetings (nominal measured, and how these relate to the question of interest. An example of this is heads, executive committee members, and other key commit- the quality of evidence for early administration of antibiotics. The assignment of strong heads to identify pertinent search terms that were to include, or weak is considered of greater clinical importance than a at a minimum, sepsis, severe sepsis, septic shock, and sepsis syn- difference in letter level of quality of evidence. The commit- drome crossed against the subgroup’s general topic area, as well tee assessed whether the desirable effects of adherence would as appropriate key words of the specifc question posed. All outweigh the undesirable effects, and the strength of a rec- questions used in the previous guidelines publications were ommendation refects the group’s degree of confdence in searched, as were pertinent new questions generated by gen- that assessment. Thus, a strong recommendation in favor of eral topic-related searches or recent trials. A weak recommendation in favor of an intervention Clinical Trials, International Standard Randomized Controlled indicates the judgment that the desirable effects of adherence Trial Registry [http://www. Where appropriate, available evidence was either because some of the evidence is low quality (and thus summarized in the form of evidence tables. Diagnostic Criteria for Sepsis Infection, documented or suspected, and some of the following: General variables Fever (> 38. Diagnostic criteria for sepsis in the pediatric population are signs and symptoms of infammation plus infection with hyper- or hypothermia (rectal temperature > 38. A strong recom- The implications of calling a recommendation strong mendation is worded as “we recommend” and a weak recom- are that most well-informed patients would accept that mendation as “we suggest. Severe Sepsis Severe sepsis defnition = sepsis-induced tissue hypoperfusion or organ dysfunction (any of the following thought to be due to the infection) Sepsis-induced hypotension Lactate above upper limits laboratory normal Urine output < 0. Indirectness of evidence (differing population, intervention, control, outcomes, comparison) 4. High likelihood of reporting bias Main factors that may increase the strength of evidence 1. Large magnitude of effect (direct evidence, relative risk > 2 with no plausible confounders) 2.
Death is usually due to lethal heart rhythms and without access to a defibrillator then there is very little which can be done in an austere situation discount 10mg levitra with mastercard. If a patient who has been having chest pain collapses in front of you order levitra 20 mg mastercard, a precordial thump (a firm – but not excessive – blow with a closed fist delivered to the lower third of the breast bone) may be useful and can sometimes revert a lethal heart rhythm – it delivers the equivalent of 5-10 joules of energy to the heart – compared with 200-300 with a defibrillator levitra 10 mg discount. A wide range of medications are used during and after a heart attack to reduce the incidence of death and complications. Information regarding these can be found in most of the major references – but access to these is unlikely in an austere or disaster environment. For the majority of injuries direct pressure, elevation +/- a tourniquet will stop bleeding. In circumstances where this is insufficient the most common cause is an injury to a large vein or artery, or where access to apply direct pressure or a tourniquet is limited. The dry layer indicates the blood is as concentrated as it will become (no more free water to absorb). The clot is a "fragile" clot and must be re-dressed with a pressure dressing/bandage or bleeding will re-occur due to damage/blow out of the clot. In an uncontrolled haemorrhage model in pigs the QuikClot dressing improved survival and decreased bleeding. The temperature rises more sharply when the QuikClot granules encounter water compared with blood. The temperature rises within 30–60 seconds and lasts several minutes, with a peak between 42°C and 44°C for about 30 seconds. They accelerate haemostasis by concentrating coagulation products around the spheres. It is more suitable for minor to moderate bleeding or ooze over a larger area, such as an abrasion or skin graft donor site (not an austere indication! It bonds with blood cells to form a clot, and also has some antimicrobial - 181 - Survival and Austere Medicine: An Introduction effect. There was some concern early on regarding those with seafood allergies, but this appears to be unfounded. If you are limited in what you can get, we suggest you purchase and expand in this order. All are good broad spectrum antibiotics and have different strengths and weakness. We suggest you purchase an antibiotic guide, most medical bookshops have small pocket guides for junior doctors detailing which drug to use for which bug and outlining local sensitivities. If allergic to penicillin a macrolide such as Erythromycin can generally be used interchangeably where a penicillin based antibiotic is indicated. It is only a small minority (a few %) of patients who develop a rash who if re-exposed will develop a life threatening allergic reaction. If you are in an disaster situation (with no medical help) with a life saving indication for a penicillin-based antibiotic, and a history of only a mild rash, and no alternative available, it is reasonable to give a single dose of antibiotic and be prepared for an allergic reaction. If you have had a serious allergic reaction before (breathing problems, swollen lips or tongue, low blood pressure, or a wide spread lumpy red rash) then you should avoid - 182 - Survival and Austere Medicine: An Introduction penicillin-based antibiotics under all circumstances and plan your medical supplies accordingly. A reasonable general rule would be 48 hours after resolution of most major symptoms. In the case of a patient who appears not to be responding to treatment, there are a number of possibilities - it is the wrong antibiotic for the infection, it is not reaching the site of infection, concentrations are not high enough (oral vs. Knowledge has a tendency to fade with time and non-use ,and there will always be situations arise that require looking up a procedure, a pictorial reference, a protocol or dosing information. Healthcare practitioners undertake regular continuing education to not only stay abreast of the latest techniques but also to aid in retaining skills not often practiced. Having good reference books on hand may be critical during times when the education system is no longer working or accessible, and when you are facing a situation that calls for new knowledge or reviewing previous training. This section will be divided into three primary areas: the basic must haves; those that support the first category, and everything else. The first category lists those books which by themselves constitute a very comprehensive survival medicine library. The second group represents those works, which expand the capabilities of the library further but are not deemed first line access works. Finally, a third section will list useful references that may be considered later.
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