By K. Umbrak. Antioch University Santa Barbara. 2018.
Carbon dioxide is twenty times more soluble than oxygen purchase abana 60pills without a prescription, enabling rapid diffusion (and so removal) across capillaries (Hough 1996) order abana 60pills amex. Carbon dioxide binds to globin, not haem, so unlike carbon monoxide does not displace oxygen. Like the oxygen dissociation curve, carbon dioxide dissociation can move to the right or left. Rightward shifts (favouring dissociation of oxygen from haemoglobin) occur with raised levels concentrations of oxygen in blood. Haemoglobinopathies Critical illness is frequently complicated by haemoglobinopathies; four are described here. Methaemoglobin shifts the oxygen dissociation curve leftwards, reducing oxygen availability for tissues. Oxidation can be caused by various drugs, including lignocaine, nitrates and metoclopramide (Adam & Osborne 1997) and nitric oxide. Methaemoglobin causes pulse oximetry readings of 85 per cent, regardless of arterial oxygen saturation (Wahr & Tremper 1996). The half-life of carbon monoxide in air is 250 minutes; this time can be reduced by increasing oxygen concentration or atmospheric pressure (see Chapter 29). Thalassaemia may also be classified as major, intermedia or minor, depending on its severity. The genetic defect reduces erythrocyte life (Buswell 1996), thus reducing erythrocyte concentration below 2 million per cubic millimetre (Marieb 1995). Since anaemia is caused by lack of erythrocytes, traditional treatment has been blood transfusion to increase haemoglobin concentration. However, frequent transfusion can cause iron overload (Buswell 1996), and so desferrioxamine (an iron chelator) helps to prevent hepatic failure. Splenectomies may be performed where erythrocyte destruction exceeds production, and younger patients may receive bone marrow transplant if a sibling or parent is HbA compatible. Sickle-shaped erythrocytes can occlude small capillaries, causing necrosis, infarction and ischaemic pain in tissue beyond occlusions. Cerebral and renal microcapillaries are at special risk; small peripheral blood vessels often cause intense pain. Sickle genes cause erythrocytes infected by malarial parasites to adhere to capillary walls, denying parasites the potassium they need to survive. Sickle cells provide protection from malaria (Marieb 1995), and so this mutation has flourished in the malarial belt. Sickle cell crises may occur with any hypoxic stressor, such as exercise, altitude, surgery, anaesthetic gases or critical illness. Crisis carries a significant mortality, so that although people with both haemoglobin chromosomes (HbS, HbS) are most at risk, people with sickle cell trait (HbS, HbA) can sickle with extreme hypoxia. Crisis management focuses on providing: ■ analgesia ■ oxygen ■ fluids ■ blood (exchange) transfusion Sickle crisis pain is intense, requiring strong analgesia. Traditionally, pethidine was used, although poor absorption and tolerance reduce benefits below the usually cited two hours, Gas carriage 163 so morphine is increasingly used (Thomas & Westerdale 1997). Despite anecdotal concerns about addiction and feigning crises to obtain opiates, benefits from analgesia to those in crisis far outweigh risks from drug abuse (see Chapter 7). The delivery of oxygen to ischaemic tissues relieves ischaemic pain and prevents further damage (although reperfusion injury may damage tissue—see Chapter 26). Giving intravenous fluids to increase blood volume and reduce viscosity, while optimising alveolar oxygen, favours oxygen delivery. The complex dissociation of oxygen has been discussed in this chapter; the dissociation curve will be referred to in some later chapters to help nurses apply its principles to bedside care. Although carbon dioxide is carried through three mechanisms, its dissociation is relatively linear and simple. Blood gas analysis is widely used to assess both respiratory and metabolic function. Non-invasive and continuous display technology may replace intermittent arterial sampling, but components measured are likely to remain, and so have been described. Nurses can valuably develop their skills with blood gas analysis by working through samples from practice, remembering to apply information within the context of the whole patient. Articles on haemoglobinopathies appear periodically in nursing journals (Thomas & Westerdale 1997); further information can be obtained from the support groups mentioned above. This chapter begins with a discussion of acid-base balance, goes on to suggest briefly good practice for taking arterial blood gas samples, and then discusses other results commonly found in blood gas analysis. Like many other aspects of practice, the technology for blood gas analysis varies, as does the data used between units. Acid-base definitions An acid is a substance capable of providing hydrogen ions; a base is capable of accepting hydrogen ions. Acid-base balance, therefore, is the power of hydrogen ions (pH) measured in moles per litre (‘power’ used in the mathematical sense, for the negative logarithm). The power of hydrogen ions can be controlled (balanced) either through buffering or exchange. Hydrogen is a positively charged ion (cation) which can be buffered by negatively charged ions (anion) such as bicarbonate. Hydrogen may move into another body compartment, either through pressure gradient differentials or in exchange for similarly charged ions. The only other significant cations in the human body are sodium and potassium, while the only significant anions are chloride and bicarbonate. Intensive care nursing 166 pH measurement Hydrogen ion concentrations in body fluids are about one million times less than concentrations of other ions (Hornbein 1994). Despite these very small concentrations, hydrogen ions are highly reactive, with small changes in concentration creating significant changes in enzyme activity (Hornbein 1994) and oxygen carriage (the Bohr effect—see Chapter 18). With plasma concentrations being so small, ions are measured by a negative logarithm. Thus, the log to the base 10 represents multiples of 10 by a power: Increasing one figure in the power represents a tenfold increase in the actual number. Negative logarithms use the same principle to manage very small numbers, so that: Acid-base balance and arterial blood gases 167 Normal plasma concentrations of 0. While the pH scale enables concentrations of huge ranges within confined limits of 0–14 (absolute acid to absolute alkaline), small alterations in pH can significantly alter hydrogen ion concentrations.
Moderate intensity means that you’re increasing your breathing and heart rate buy 60pills abana fast delivery, which you can do by mowing the lawn generic 60pills abana overnight delivery, dancing, swimming, bike riding, jogging, or even walking at a rapid pace. Thus, if your job is physically demanding, you may already be getting sufﬁcient exercise every day. On the other hand, if you religiously take your dogs on a leisurely walk every morning for 45 minutes, that probably won’t do the trick — you need to pick up your pace because anything done leisurely just doesn’t cut it. Therefore, an exercise program that works for one person may not work for another. The following instructions and checklist in Worksheet 10-3 are designed to help you choose exercise that will work into your life. Read through Worksheet 10-3, checking off all the exercise ideas that could conceiv- ably become part of your routine. Include comments on how you think you can work these activities into your daily life. Chapter 10: Lifting Mood Through Exercise 153 Worksheet 10-3 Exercise Checklist ❑ Get up 15 minutes early each day and take a brisk walk — take the dogs if you have any! And hopefully you’ve found a few types of exercise that just may ﬁt into your life and have tried them out. Your intentions may be good, but what happens when your ini- tial enthusiasm and commitment to do something positive for yourself fade? Fighting de-motivating thoughts The problem with ﬁnding and maintaining motivation to exercise lies in distorted, de-motivating thinking (see Chapters 5, 6, and 7 for more on distorted thinking). De-motivating thinking keeps you from taking action and puts you in a defeatist frame of mind, where you’re doomed to fail. The following example gives you an idea of how you can give de-motivating thoughts the one-two punch. She rushes off every morning to drop her kids at day care and tries to ﬁt in her errands during a 45-minute lunch break. When her doctor suggests she begin exercising to improve her mood and health, Janine laughs and says, “You’ve got to be kidding; I don’t have an extra second in my day. Worksheet 10-5 shows what she comes up with, and Worksheet 10-6 has her reﬂections on the exercise. For example, rather than saying, “You’re the best person in the whole world,” consider narrowing it down and saying, “I love the way you play with the baby. For example, you may make a note in your calendar or put sticky notes in various places around the house. Get into the habit of handing out genuine compliments to everyone, not just your partner. Doing so will improve your popularity by making people notice you, and it may even get you a raise! Some people dismiss compliments by saying, “Oh, you don’t mean that,” or “That isn’t really true. People dismiss compliments not because they don’t want to hear them but because they have trouble accepting them. After you spend a couple of weeks increasing the compliments you give your partner, reﬂect on any changes in your relationship (see Worksheet 15-5). Self-Blame Reality Scramblers relationships, and effects of, 207–208 body signals. Hachette Livre’s policy is to use papers that are natural, renewable and recyclable products and made from wood grown in sustainable forests. The logging and manufacturing processes are expected to conform to the environmental regulations of the country of origin. Whilst the advice and information in this book are believed to be true and accurate at the date of going to press, neither the authors nor the publisher can accept any legal responsibility or liability for any errors or omissions that may be made. In particular, (but without limiting the generality of the preceding disclaimer) every effort has been made to check drug dosages; however it is still possible that errors have been missed. Furthermore, dosage schedules are constantly being revised and new side-effects recognized. For these reasons the reader is strongly urged to consult the drug companies’ printed instructions before administering any of the drugs recommended in this book. He considered a text in clinical pharmacology suitable for his undergraduate and postgradu- ate students to be an important part of the programme he developed in his department at Guy’s Hospital Medical School, London. In other words, he helped to change a ‘non-subject’ into one of the most important areas of study for medical students. He was also aware of the need for a high quality textbook in clinical pharmacology that could also be used by nurses, phar- macists, pharmacology science students and doctors preparing for higher qualifications. It is interesting to follow in all the editions of the book, for example, how the treatment of tumours has progressed. It was about the time of the first edition that Trounce set up the first oncology clinic at Guy’s Hospital in which he investigated the value of combined radiation and chemotherapy and drug cocktails in the treatment of lymphomas. John Trounce was pleased to see his textbook (and his subject) in the expert hands of Professor Ritter and his colleagues. Clinicians of all specialties pre- scribe drugs on a daily basis, and this is both one of the most useful but also one of the most dangerous activities of our professional lives. Understanding the principles of clinical pharma- cology is the basis of safe and effective therapeutic practice, which is why this subject forms an increasingly important part of the medical curriculum. This textbook is addressed primarily to medical students and junior doctors of all special- ties, but also to other professionals who increasingly prescribe medicines (including pharma- cists, nurses and some other allied professionals). Clinical pharmacology is a fast moving subject and the present edition has been completely revised and updated. It differs from the fourth edition in that it concentrates exclusively on aspects that students should know and understand, rather than including a lot of reference material. Another feature has been to include many new illustrations to aid in grasping mechanisms and principles. The first section deals with general principles including pharmacodynamics, pharmaco- kinetics and the various factors that modify drug disposition and drug interaction. Drug metabolism is approached from a practical viewpoint, with discussion of the exciting new concept of personalized medicine. Adverse drug reactions and the use of drugs at the extremes of age and in pregnancy are covered, and the introduction of new drugs is discussed from the viewpoint of students who will see many new treatments introduced during their professional careers. Many patients use herbal or other alternative medicines and there is a new chapter on this important topic.
Proteolytic property showing blackening of the meat with unpleasant smell due to protein decomposition cheap abana 60pills online. Nagler reaction: Lecithinase C activity- Opacity in the egg-yolk medium due to lecithin break down 199 Procedure: 1 order 60 pills abana with mastercard. Treatment: Penicillin Prompt and extensive wound debridement Polyvalent antitoxin Prevention and control Early adequate contaminated wound cleansing and debridement 200 Closridium difficile General characteristics:. Not frequently found in the healthy adult, but is found often in the hospital environment. Human feces are the expected source of the organism Pathogenesis and clinical features: Administration of antibiotics like ampicillin, clindamycin and cephalosporins results in killing of colonic normal flora and proliferation of drug resistant C. Dignosis: Identification of toxin A and B in feces by latex agglutination test Treatment: Dicontinuation of offending drugs Administration of metronidazole or vancomycin 201 Clostridium tetani General characteristics: • World wide in distribution in the soil and in animal feces • Longer and thinner gram-positive rods with round terminal spores giving characteristic “drum-stick” appearance. Tetanolysin: Hemolytic property Pathogenesis and Clinical manifestation: Infection of devitalized tissue (wound, burn, injury, umblical stamp, surgical suture) by spores of C. Muscle spasm and rigidity Laboratory diagnosis: The bacteria can be cultured in a media with anaerobic atmosphere. The toxin is absorbed from the gut and acts by blocking the release of acetylcholine at synapses and neuromuscular junction and manifests with flaccid paralysis and visual disturbance, inability to swallow, and speech difficulty Death is secondary to respiratory failure or cardiac arrest 2. Treatment: Administration of intravenous trivalent antitoxin ( A,B,E) Mechanical ventilator for respiratory support Prevention and control:. Diphteria toxin causes respiratory tract epithelial destruction tesulting in formation of necrotic epithelium with pseudomembrane formation over the tonsils, pharynx, and larynx. Distant toxic damage includes parenchymal degeneration and necrosis in heart muscle, liver, kidney, adrenal glands and peripheral and cranial nerves. Wound/skin diphteria occurs chiefly in the tropics and forms membrane-covered wound that fails to heal. Laboratory diagnosis: Specimen: Swabs from the nose, throat, or suspected lesion Smears: Beaded rods in typical arrangement when stained with alkaline methylene blue or gram’s stain Culture: Small, granular,and gray, with irregular edges with small zone of hemolysis on blood agar Selective media are necessary for isolation from cilincal specimens Selective media 1. Blood tellurite agar: Produce characteristic grey-black colonies due to their ability to reduce potassium tellurite to tellurium Characteristics of C. Gel-precipitation (Elek) test: a filter paper strip previously immersed in diphteria antitoxin is incorporated into serum agar; the strain of C. Incubate at 37 c for 1-2 days, and observe for lines of precipitation in the agar indicating toxin-antitoxin interaction. Schick test: a skin test to demonstrate immunitydue to immunization or natural infection Method: Intradermal injection of toxin into the anterior aspect of one forearm and heat-inactivated toxin into the other. Reactions due to the toxin are slower and longer lasting than those resulting from hypersensitivity. Listreriolysin( hemolysin) Pathogenesis and clinical features: Transmitted to humans through ingestion of poorly coooked meat and unpasteurized milk and milk products 1. Swine is major reservoir Pathogenicity and clinical features: Most human cases of disease are related to occupational exposure, i. Diagnosis: Specimen: Blood Culture: Shows α-hemolysis on Blood agar Biochemical reaction:. Neisseria gonorrhoea Antigenic structure: antigenically heterogeneous and capable of changing its surface structures. Pili: Hair-like appendages extending from bacterial surface and enhance attachment to host cells and evade human defense. Fbp(Iron binding protein):Expressed when there is limited available iron supply 8. IgA1 protease:Splits and inactivates major mucosal IgA(IgA1) Clinical manifestation: Route of infection: Sexual contact Male:. Gonococcal urethritis If complicated: Urethral stricture Gonococcal epididymitis Gonococcal epididymo-orchitis Infertility. Gonococcal salpingitis If compicated: Gonococcal tubo-ovarian abscess 215 Pelvic peritonitis Infertility Infant (When delivered through the infected birth canal). Gonococcal ophthalmia neonatorum If untreated and complicated leads to blindness Laboratory diagnosis: Specimen: Urethral swab, cervical swab, eye swab Smear: Gram-negative intracellular diplococci More than five polymorphs per high power field. Culture of urethral exudate from men are not necessary when the gram stain is positive but culture should be done for women Biochemical reaction:. Drug of choice: Ceftriaxone Ciprofloxacin Prevention and control • Avoid multiple sexual partner • Using mechanical protection methods (condom) • Early diagnosis and prompt treatment of cases • Contact tracing • Screening of high risk population groups • Ophthalmic ointment application of erythromycin or tetracycline to the conjunctiva of all new borns 217 Neisseria meningitidis Characteristics: • Gram-negative intra cellular diplococci. Capsular carbohydrate It is important for serogrouping of meningococci and there are 13 serogroups. The most important serogroups associated with disease in humans are A, B, C, Y and W135. Outer membrane protein Analogous to por protein of gonococci and responsible for the formation of por in the meningococcal cellwall 20 known serotypes It is responsible for serotype specificity of meningococci. Lipopolysaccharide Responsible for the toxic effects found in meningococcal disease Clinical manifestation:. Serology: Latex agglutination test/ Hemmagglutination test Treatment: Penicillin Penicillin-allergic patients are treated with third- generation cephalosporins or chloramphenicol Prevention and control. Rifampicin is used as prophylactic drug to reduce the carrier state during epidemics and given to house hold and other close contacts. Lipo-oligosaccharide 222 Clinical features: The bacteria causes disease most commonly in young children. Acute pyogenic arthritis Laboratory diagnosis: Specimen: Cerebrospinal fluid, sputum, blood, pus Smear: Gram-negative short rods. Culture: Chocolate agar contain both X and V factor; blood agar contain only X factor. Serology: Quellung reaction (using specific antisera) Immunofluorescence stain 223 Treatment: Ampicillin Chloramphenicol Cotrimoxazole Third generation cephalosporins H. Clinical features: Incubation period: 2 weeks Route of transmission is respiratory from early cases and possibly carries. Convalescence stage During catarrhal stage, the patient is highlyinfectious but not very ill manifesting with mild coughing and sneezing. During paroxysmal stage, the patient presents with explosive repetitive cough with characteristic ‘whoop’ upon inhalation leading to exhaustion, vomiting, cyanosis and convulsion. Laboratory diagnosis: Specimen: Saline nasal wash (Preferred specimen) Nasopharyngeal swab or cough droplets on cough plate Smear: Small, non-motile, capsulated, gram-negative cocobacilli singly or in pair, and may show bipolar staining. Culture: Inoculate the primary specimen on Bordet-Gengue agar o medium and incubate for 2-6 days at 37 c in a moist aerobic atmosphere which produces small, raised, shiny, mucoid colonies.