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The combination is used in the treatment of malaria caused by chloroquine-resistant Plasmodium falciparum cheap tadora 20mg otc. Adverse effects (1) Sulfonamides produce hypersensitivity reactions (rashes generic tadora 20mg, fever generic tadora 20 mg free shipping, eosinophilia) in approx- imately 3% of individuals receiving oral doses trusted tadora 20 mg. It is used in combination with other drugs for the treatment of most atypical mycobacteria, including M. Adverse effects of rifampin include nausea and vomiting, dermatitis, and red-orange discol- oration of feces, urine, tears, and sweat. Rifampin induces liver microsomal enzymes and enhances the metabolism of other drugs such as anticoagulants, contraceptives, and corticosteroids. Fluoroquinolones (1) These agents, ciprofloxacin (Cipro), norfloxacin (Noroxin), ofloxacin (Floxin), levoflox- acin (Levaquin), moxifloxacin (Avelox), lomefloxacin (Maxaquin), and gemifloxacin (Factive), are fluorinated analogs of nalidixic acid (NegGram), which is now used infrequently. Moxifloxacin and gemifloxacin have even greater activity against gram-positive organisms. These agents are useful against urinary tract infections and against infections caused by Chapter 11 Drugs Used in Treatment of Infectious Diseases 265 N. Cartilage toxic- ity has been reported, and thus these agents should not be used in children and young adults. Polymyxin is a cationic basic polypeptide that acts as a detergent to disrupt the cell membrane functions of gram-negative bacteria (bactericidal). Polymyxin has substantial nephrotoxicity and neurotoxicity and is therefore only for ophthal- mic, otic, or topical use. Polymyxin B often is applied as a topical ointment in mixture with bacitracin or neomycin, or both (Neosporin). Metronidazole, a prodrug, is bactericidal against most anaerobic bacteria, as well as other organisms, including anaerobic protozoal parasites. Daptomycin (Cubicin) is a very powerful cyclic lipopeptide bactericidal agent that has a spec- trum of activity similar to vancomycin. Myelosuppression and pseudomembranous colitis can occur with the use of this agent. The streptogranins bind the 50S ribosomal subunit and are bactericidal for most organisms. Trimethoprim/sulfamethoxazole, ampicillin, or third-generation cephalosporin Erythromycin Legionella spp. Hepa- totoxicity with jaundice is observed in up to 3% of individuals over age 35. High serum concentrations of this agent may result in peripheral neuropathy; slow acetylators are more susceptible. Structure and mechanism of action (1) Rifampin is a semisynthetic derivative of the antibiotic rifamycin. Resistance, a change in affinity of the polymerase, develops rapidly when the drug is used alone. It enters enterohepatic circulation and induces hepatic mi- crosomes to decrease the half-lives of other drugs, such as anticonvulsants. Structure and mechanism of action (1) Ethambutol inhibits arabinosyl transferases involved in cell wall biosynthesis. Ethambutol is administered orally in combination with isoniazid to avoid development of resistance. Pyrazinamide is inactive at neutral pH, but it inhibits tubercle bacilli in the acidic (pH 5) phagosomes of macrophages. Hepatotoxicity is the major adverse effect, with occasional jaundice and (rarely) death. Pyr- azinamide inhibits urate excretion and can precipitate acute episodes of gout. Parenterally and/or orally administered agents include fluoroquinolones, kana- mycin, amikacin, and capreomycin (Capastat Sulfate), protein synthesis inhibitors. The size of induration (5–15 mm) is noted, and patients are treated according to the risk-stratification category. A 10-mm induration is considered a positive result in persons who recently moved from a high-prevalence country, injection drug users, residents and employees of high-risk congre- gate settings (this includes healthcare workers), persons with certain medical conditions that put them at high risk (e. This phase is extended an additional 3 months for patients who had cavitary lesions at presentation or on a follow-up chest x-ray, or are culture positive at the 2-month point. Drugs used in the treatment of infections caused by Mycobacterium leprae (leprosy) 1. Dapsone is a sulfone structurally related to sulfonamides; it competitively inhibits dihydrop- teroate synthase to prevent folic acid biosynthesis. Treatment may require several years to life; dapsone is often used in combination with rifampin to delay the development of resistance. Rifampin is also effective, but it is often used in combination with dapsone to decrease the risk of resistance. Clofazimine (Lamprene) is used with dapsone and rifampin for sulfone-resistant leprosy or in patients intolerant to sulfones; it may also be effective against atypical mycobacteria. Amphotericin B is an antibiotic that binds to ergosterol, a major component of fungal cell membranes. It is believed to form ‘‘amphotericin pores’’ that alter membrane stability and allow leakage of cellular contents. Amphotericin B binds to mammalian cholesterol with much lower affinity, but this action may explain some adverse effects. Therapeutic uses (1) Amphotericin B is used to treat most severe fungal infections, including those caused by Candida albicans, Histoplasma capsulatum, Cryptococcus neoformans, Cocci- dioides immitis, Blastomyces dermatitidis, Aspergillus spp. Adverse effects (1) The adverse effects of amphotericin B are significant; this agent causes chills and fever in 50% of patients and impaired renal function in 80%. Itraconazole, ketoconazole, miconazole, fluconazole, clotrimazole, voriconazole, and others a. General properties (1) These agents are imidazoles or triazoles that inhibit the cytochrome P-450–mediated sterol demethylation of lanosterol to ergosterol in fungal membranes. The affinity of the mammalian P-450–dependent enzyme is significantly lower; however, these agents can inhibit cortisone and testosterone synthesis. Itraconazole (Sporonox), ketoconazole (Nizoral) (1) Itraconazole has replaced ketaconazole for treatment of all mycoses except when cost is a factor. Ketoconazole is used topically for dermatophyte infections and mucocutaneous candidiasis and as a shampoo for seborrheic dermatitis. Miconazole (Monistat) (1) Miconazole is available for topical application, which is associated with a high inci- dence of burning and itching. This agent can be used for tinea pedis, ringworm, and cu- taneous and vulvovaginal candidiasis. Clotrimazole (Lotrimin, Mycelex), econazole (Spectazole), oxiconazole (Oxistat), sulconazole (Exelderm), sertaconazole (Ertaczo), butoconazole (Gynazole-1), terconazole (terazol-3) (1) These agents are available for topical application and are useful for many dermatophyte infections. Voriconazole (Vfend) (1) Voriconazole is approved for primary treatment of acute invasive aspergillosis and sal- vage therapy for rare but serious fungal infections caused by the pathogens Scedospo- rium apiospermum and Fusarium spp. Nystatin is a polyene antibiotic that is similar in structure and mechanism of action to amphotericin B. Nystatin is used only for Candida infections of the skin, mucous membranes, and intestinal tract. Griseofulvin binds to microtubules and prevents spindle formation and mitosis in fungi. Flucytosine is actively transported into fungal cells and is converted to 5-fluorouracil and subsequently to 5-fluorodeoxyuridylic acid, which inhibits thymidylate synthetase and thus pyrimidine and nucleic acid synthesis. Human cells lack the ability to convert large amounts of flucytosine to the uracil form. Resistance develops rapidly and limits its use; flucytosine is rarely used as a single drug, but it is often used in combination with other antifungal agents. Flucytosine is relatively nontoxic; the major adverse effects of this agent are depression of bone marrow function at high doses and hair loss. Tolnaftate (Aftate, Tinactin), naftifine (Naftin), terbinefine (Lamisil), butenafine (Lotrimin), cyclopirox (Loprox). It is used for sal- vage therapy in patients with severe aspergillosis who failed therapy with amphotericin B. Malaria (1) In the primary state of infection, sporozoites are injected into the host by the female mosquito (or a contaminated needle). The sporozoites migrate to the liver (primary exoerythrocytic stage) and then sporulate (Plasmodium vivax and P. The merozoites that emerge infect erythro- cytes (erythrocytic stage), where asexual division leads to cell lysis and causes clinical symptoms. The merozoites released can reinfect other red blood cells, reinfect the liver (P. Pyrimethamine/sulfadoxine, doxycycline, quinidine,orclindamycin may be used as adjunctive therapy. In regions with chloroquine-resistant strains, mefloquine or atovaquone/proguanil (Malarone) is used for prophylaxis. This agent produces curare-like effects on skeletal muscle, and it can cause headache, nausea, visual disturbances, dizziness, and tinnitus (cinchonism). Antibacterial agents (1) Sulfonamides and sulfones are particularly important in the prophylaxis of chloroquine- resistant strains. Artemisinins and analogs (1) Artemisin (quinghaosu) is the active agent of an herbal medicine. It and its major syn- thetic analogs (artensuate, artemether), which are usually used in combination treat- ments (mefloquine), are rapidly metabolized to dihydroartemisinin that has good activity for the initial treatment of P. The major infecting organism is Entamoeba histolytica, which is ingested in cyst form, divides in the colon, and can invade the intestinal wall to cause severe dysentery.
The Doctors reached the food area between instructions how to make hand orthoses from local materials 20mg tadora otc. Re- 1–4 weeks and spent an average of 30 days in the food affected sults: After 16 weeks of the telerehabilitation best tadora 20mg, there was improve- areas discount tadora 20 mg on-line. Gastrointestinal purchase tadora 20 mg with amex, respiratory and skin Conclusion: Telerehabilitation programs can be delivered even if infections were the commonest ailments followed by conjuncti- there was no sophisticated technology. Hasnan1 rehabilitation services are required in initial days of foods, general 1University of Malaya, Rehabilitation Medicine, Kuala Lumpur, duty doctors trained in common food related ailments are suff- Malaysia cient, however evacuation of previously disabled person residing in the area should be catered for. Conclusion: Higher self-effcacy and independence level evacuees living in temporary housing, and to identify whether the are associated with higher ftness level. It is therefore important amount of physical activity was related to physical ftness and qual- that rehabilitation interventions include strategies to promote and ity of life. Material and Methods: Sixty-four residents of temporary improve self-effcacy and independence. These measures may lead housing in Minamisoma city, aged ≥65 years participated in the to higher physical activity and ftness level. The average daily steps of each participant were measured using a triaxial accelerometer to be representative of the daily phys- ical activity. No relationship was observed between the amount of Aqil, Pakistan physical activity and physical ftness and health-related quality of life except for “physical function”. Conclusion: Physical activity of Introduction/Background: Floods are one of the most frequent nat- the elderly residents of temporary housing complexes was shown ural disasters in recent history. The aim of this study was to analyze to be less compared with the national average of age-matched in- the spectrum of medical issues during foods and to document the dividuals. This decrease in their activity level puts them at risk for needs for medical rehabilitation expertise during foods in Paki- developing lifestyle diseases. Material and Methods: A questionnaire based cross-sectional facilitating the performance of activities of daily living (i. Doctors who provided services in the food ing, laundry, bathing) for the residents in temporary housing may affected areas in the acute phase were interviewed. Orpilla 1 cast for immobilizing the unaffected hand for 5 hour/day and com- Philippine Academy of Rehabilitation Medicine, Manila, Philip- pleted unimanual practice with the hemiplegic hand. Participants were doctors and allied health professionals involved in stroke rehabilitation in the rehabilitation training hospitals in Metro Manila. There were variations in outcomes in the other practices descriptors and auditing guidelines in line with the key 1The University of Hong Kong, Institute of Human Performance, recommendations from the contextualized stroke guidelines. The Hong Kong, Hong Kong- China, 2The Hong Kong Polytechnic Uni- health professionals perceived and valued the guideline implemen- versity, Department of Rehabilitation Sciences, Hong Kong, Hong tation as practical and collaborative. It provided summary of ef- Kong- China, 3The Sixth Affliated Hospital of Sun Yat-sen Univer- fective strategies in stroke rehabilitation and standardized practice. Conclusion: Introduction/Background: This novel study aimed to (1) compare Improvements in some descriptors and quality indicators were seen neuromuscular performance, postural control and motor skills pro- one-year post implementation of recommended guidelines. Three of the six variables for positive reward were toys, snacks, and tablet games and the remaining three for negative were the parents, room and soft pool of balls. Simple percentage was used 1The University of Hong Kong, Institute of Human Performance, to determine the profle of the subjects and mean was used to analyze Hong Kong, Hong Kong- China, 2The University of Hong Kong, the response time on compliance in the reward system. Motor clumsiness is related to sensorimotor defcits and possibly mental 188 attention problems. A multiple regression analysis long-term complications including musculoskeletal disability. Treatment: decrease weight bearing, Ca tion index remained signifcantly associated with the total impair- and vitamin D supplementation. These complications can impair tive Sciences- Department of Physical Therapy, Cebu City, Philip- the survivors’ health-related quality of life. Chen of research, the goal of this study is to determine the effect of positive 1Chang Gung Memorial Hospital- Chiayi, Physical Medicine and and negative reward reinforcements’ response time on compliance to Rehabilitation, Puzih, Taiwan, 2Chang Gung University, School of J Rehabil Med Suppl 55 Short Oral Abstracts 61 Medicine- College of Medicine, Taoyuan, Taiwan, 3Chang Gung be desirable to base forecasts concerning the need for health ser- Memorial Hospital- Chiayi, Traditional Chinese Medicine, Puzih, vices in the future on the model developed during the project. However, com- Hospital Sultan Ismail, Rehabilitation Medicine, Johor Bahru, prehensive information regarding the costs and utilization of reha- Malaysia bilitation for such patients remains scarce. This population-based Introduction/Background: Based on recent data from Malaysian study used a nationwide database to examine the characteristics and Registry of Intensive Care, the incidence of PrU in Hospital Sul- trends of rehabilitation costs and use in Taiwanese patients with tan Ismail, Johor Bharu increased from 8. Material and Methods: Primary ob- hemophilia A who were registered in the National Health Insur- jective: to investigate and analyze the cost of PrU management ance Research Database between 1998 and 2008 were analyzed. Secondary objectives: to Results: The total costs for physical, occupational, and speech/ compare the cost of PrU management between paraplegics and swallowing therapy among patients with hemophilia A during the tetraplegics. Although the rehabilitation costs have increased had their inpatient records reviewed over seven consecutive days since 2004, these values have fuctuated without additional year- based on the most eventful week. They collectively had 55 PrU with an average of 3 PrU per rates for outpatient rehabilitation among all patients with hemo- patient. Conclusion: Higher and encourage these patients to utilize rehabilitation resources to stage of PrU resulted in higher management cost. Bitenc1 ing, thereby increasing patients’ self-reliance and consequently her 1University Rehabilitation Institute Soča, Development centre for dependence on healthcare services. Persons analysis we use data from the Norwegian Patient Registry, Registry with disabilities in Slovenia are mainly employed on the open la- for Individual-based Nursing and Care Statistics, and the Register bour market (80%), social economy represents approximately 20% for Control and Payment of Primary Care Reimbursement Scheme. Work in employment centres is the di- Connecting multiple data records from these sources creates a rect outcome of Slovenian employment rehabilitation services. It allows the analyst to follow an individual’s use of Slovenian thematic study was prepared in 2013 by Development various healthcare services over time. The grounds for the study basis of this formal model combining concepts from micro-eco- are based on the Slovenian Court of Audit Report recommenda- nomic theory, mathematics and statistics, state-of-the-art statistical tions. Material and Methods: Cohort study-retrospective and case- techniques will be used (i) to explain existing data, (ii) to estimate study. Results: State-aids for enterprises for PwD were reimbursed the current effects attributed to home-based reablement and (iii) to through the state with taxes from 95–114% from 2008–2012. A years of economic crises taxes paid by enterprises were lower, multidisciplinary approach combining an economic, medical and whilst in economic prosperity were higher (114%) than state-aids. Conclusion: In- For employment centre different methodology was used due to the formation concerning the quality enhancing and cost reducing po- specifcs, but it turned out that 1 € (100%) invested in employment tential of alternative care approaches is necessary for a meaningful centre produced 152% benefts. Ismal 1 of a hundred consecutive cancer inpatients referred to Rehabilita- Hospital Sungai Buloh, Rehabilitation Medicine, Sungai Buloh, tion physician. Majority of patients had tho- traumatic spinal cord injury are of poor quality with distinguish- racic lesion (n=36), followed by cervical lesion (n=15) and lumbar ing characters of abnormal sperm quantity and viability. Four patients had lesions in the spine but no neurologi- ever, there is a dearth of evidence involving men with complete cal defcit. Results: Results are shown in Table 1 containing summa- There was no difference in the need for respiratory management ries of the 2 cases. In Malay- model of care that focuses on screening, evaluation, and interven- sia, the only available modality for medically assisted sperm re- tion for impairments and functional loss that may arise as individu- trieval is using surgical techniques. Additionally, Literature review reveals scant fndings regarding clinical practice surgical sperm retrieval is an invasive procedure which carries po- guidelines for evaluation and assessment of patients with cancer- tential risk of medical complications. Further, there referral for non-surgical sperm retrieval trials from Aug 2014 to is little guidance offered regarding selection and use of clinical Nov 2015 were included. Each patient was subjected to conserva- measurement tools that enable accurate screening and evaluation. Results: A strong evidence base exists to support interval until completed 5 cycles. Results: 15 patients fulflled has been little focus on coalescing these supportive aspects of care all study criteria. Conclusion: Future efforts should focus on creating of study subjects had neurological level at and above T6 while 47% an international coalition to work towards outlining the needs of the had neurological level below T6. Induced ejaculations were unsuc- feld and to generate concrete practice guidelines. Material and Methods: 1 2 Limerick, Ireland, University College Hospital Galway, Physi- 131 patients, male: female 59:82, of mean age – 51. Epidural steroid injection under fuoroscopic guidance Department of Clinical Therapies, Limerick, Ireland, University of was done 2 times in 2 weeks time. Of 9 cases who did not improve 4 were subjected Cochrane Collaboration’s Tool for risk of bias. Conclusion: Conservative management ing system was used to rank the strength of evidence. Supervised neglect and subcutaneous 1Centro Hospitalar do Algarve, Physical and Rehabilitation Medi- adalimumab injections were found to be ineffective by single trials. Botox joined insertion of the sartorius, gracilis and semitendinosus mus- injection, hyaluronic acid injection, capsular distention, whole-body cles along the proximal medial aspect of the tibia. Future trials should consider long-term ment is associated with many causes, including gonarthrosis and, follow-up, adequate power and disease stage. Meso- therapy is a minimal invasive technique that consists of subcutane- ous injection of drugs with the objective of prolonging their effects 200 at local level. Patients were submitted to 1Airlangga University Faculty Medicine, Dept of Physical Medi- mesotherapy at baseline, 2 and 4 weeks. Tan1 due to high heels cause increased external knee adduction mo- ment and fexor moment. The second moment can be used indi- 1Gülhane Military Medical Academy, Deparment of Physical Med- rectly as the size of the load received knee on the medial side of the icine and Rehabilitation- Turkish Armed Forces Rehabilitation tibiofemoral joint. To compare between the external knee adductor moment and knee Introduction/Background: Low back pain is the most common fexor moment in healthy women who walked barefoot and wearing cause of disabilities all over the world. Material and Methods: Fourteen healthy women are one of the most commonly used interventions in radicular back age 26–35 years old were request to walking barefoot in foor 8 me- pain.
Future Prospects of Molecular Imaging in Management of Cancer Molecular imaging can improve therapeutic strategies that provide better patient selection for therapeutic personalization than conventional methods and provides a variety of new tools to accelerate the development of cancer therapies discount tadora 20 mg without a prescription. The recent drive to develop molecular imaging probes and standardize molecular imaging Universal Free E-Book Store Cancer Prognosis 217 techniques is creating the scaffolding for the evolving paradigm shift to personalized cancer therapy (Kurdziel et al purchase tadora 20 mg. The primary advantages of molecular imaging are that it is nondestructive purchase tadora 20mg, non- or minimally invasive and thus easier on patients 20mg tadora for sale, permits the collection of data over time thus enabling post therapy evaluations, and provides near real-time functional information, and encompasses large volumes of tissue (the whole body in most case). One drawback of the molecularly targeted approaches is the expensive development and lack of interest in the pharmaceutical industry to combine functional imaging with anticancer drugs in development. Unraveling the Genetic Code of Cancer A systematic analysis has been carried out for determining the sequence of well- annotated human protein-coding genes in two common tumor types to identify genetic alterations in breast and colorectal cancers (Sjoblom et al. Analysis of 13,023 genes in 11 breast and 11 colorectal cancers revealed that individual tumors accumulate an average of ~90 mutant genes but that only a subset of these contribute to the neoplastic process. Using stringent criteria to delineate this subset, the authors identiﬁed 189 genes (average of 11 per tumor) that were mutated at signiﬁcant frequency. The vast majority of these genes were not known to be geneti- cally altered in tumors and are predicted to affect a wide range of cellular functions, including transcription, adhesion, and invasion. These data deﬁne the genetic land- scape of two human cancer types, provide new targets for diagnostic and therapeutic intervention, and open fertile avenues for basic research in tumor biology. The mutated genes in breast and colon cancers were almost completely distinct, suggest- ing very different pathways for the development of each of these cancer types. Each individual tumor appeared to have a different genetic blueprint, which could explain why cancers can behave very differently from person to person. The discovery could also lead to better ways to diagnose cancer in its early, most treatable stages, and personalized treatments. Maximizing the numbers of targets available for drug development in a speciﬁc cancer means that patients will ultimately receive more personalized, less toxic drugs. Cancer Prognosis Molecular diagnostics provide an easier, less invasive way to determine cancer prognosis. For example, patients with the greatest degree of ampliﬁcation (in terms of gene copy numbers) of the N-myc gene in neuroblastoma, a highly malignant Universal Free E-Book Store 218 10 Personalized Therapy of Cancer tumor, have the worst prognosis. In addition, the abil- ity to locate residual cancer by molecular methods can aid in predicting the course of the disease. A more accurate means of prognosis in breast cancer will improve the selection of patients for adjuvant systemic therapy. Gene signatures seem to be promising for predicting outcome, and should pave the way for new therapies that are tailored to the patient. Gene-expression proﬁles based on microarray analysis can be used to predict patient survival in early-stage lung adenocarcinomas. The identiﬁcation of a set of genes that predict survival in early-stage lung adenocarcinoma allows delin- eation of a high-risk group that may beneﬁt from adjuvant therapy. Detection of mutation in an individual would theoretically lead to increased sur- veillance. Lifestyle changes might be advised to avoid known risk factors for pro- gression of cancer. In addition, some chemotherapeutic agents might be prescribed on a preventive basis. Detection of a mutation may be followed by surveillance-oriented examinations, including those involving colonoscopy, mammography, measurement of prostate- speciﬁc antigen, and other tests. Current molecular research is expected to reveal other markers for early diagnosis of cancer. In addition, the possibility of generating genetic proﬁles for individual tumors offers unique opportunities for distinguishing between metastases and primary tumors. Universal Free E-Book Store Cancer Prognosis 219 Effective targeted cancer therapeutic development depends upon distinguishing disease-associated ‘driver’ mutations, which have causative roles in pathogenesis of malignancy, from ‘passenger’ mutations, which are dispensable for cancer initiation and maintenance. Translational studies of clinically active targeted therapeutics can deﬁnitively discriminate driver from passenger lesions and provide valuable insights into human cancer biology. A subset of the genes that are mutated in patients with myeloid cancers is frequently mutated in apparently healthy persons; these mutations may represent characteristic early events in the development of hematologic cancers. Some somatic mutations are likely to be associated with a particularly high risk of subsequent cancer; larger studies could identify such mutations. Single-cell analyses might identify high-risk combinations of mutations occur- ring in the same cells. Sequencing of speciﬁc cell types might identify mutation and cell-type combina- tions with higher predictive value. Initial detection of clonal hematopoiesis might justify periodic screening for the presence of cooperating mutations at low allele frequencies that could presage cancer. Universal Free E-Book Store 220 10 Personalized Therapy of Cancer Impact of Biomarkers on Management of Cancer Biomarkers are playing an important role in the diagnosis as well as management of cancer. Predictive Biomarkers for Cancer Unpredictable efﬁcacy and toxicity are hallmarks of most anticancer therapies. Predictive markers are factors that are associated with response or resistance to a particular therapy. For malignancies other than breast cancers, validated predictive markers are not available as yet. The concept of the utilization of rear- ranged ends for development of personalized biomarkers has attracted much attention owing to its clinical applicability. Most tumors do not contain rearrangements, but the location of these rear- rangements varies from one individual to the other, making them good biomarker candidates. Previous studies on sequencing individuals’ genomes were focused on single-letter changes, but later studies looked for the swapping of entire sections of the tumor genome. Universal Free E-Book Store Determination of Response to Therapy 223 VeraTag™ Assay System for Cancer Biomarkers The VeraTag™ assay system (Monogram Biosciences) is a high performance, high throughput system for studies of gene expression, protein expression and for appli- cations such as cell signaling and pathway activation, protein-protein interaction and cell receptor binding. The system uses proprietary VeraTag™ reporters to mul- tiplex the analysis of genes and/or proteins from the same sample. The VeraTag™ assay system is ideally suited to analysis of complex biology such as that seen in cancer. These unique assays can precisely measure many types of pathway bio- markers simultaneously−using small samples, such as those obtained from stan- dard tumor biopsies. These biomarkers could be used to correlate disease type and progression, resulting in improved treatment. Further research will be aimed at applying VeraTag™ assays to retrospective analysis of patient samples from clinical trials for validation and diagnostic development. It can accelerate the development of tar- geted therapeutics, improve clinical trial design and results, clarify and individual- ize the selection of medications, and optimize outcomes for patients with cancer. Determination of Response to Therapy Several approaches have been investigated for predicting and monitoring response to anticancer chemotherapy. Capecitabine (Roche’s Xeloda) is a novel, oral ﬂuoropyrimidine carbamate ratio- nally designed to generate 5-ﬂuorouracil preferentially in tumor tissue via a three- step enzymatic cascade. Companion diagnostic tests based on various biomarkers−thymidylate synthase, thymidine phosphorylase, and dihydropyrimidine dehydrogenase − are being inves- tigated to predict responders to this therapy. Ex Vivo Testing of Tumor Biopsy for Chemotherapy Sensitivity Many oncologists are beginning to believe that new techniques to evaluate tumors’ responses to chemotherapeutic agents promise a future of personalized cancer man- agement. Hence, highly responsive cancers are those with the greatest degree of apoptosis in the laboratory. The Company has developed a novel regimen for refractory ovarian cancers−gemcitabine plus cisplatin. Study results showed a correlation between ex vivo sensitivity and resistance and patient out- come. The Gynecologic Oncology Group, a multicenter non-proﬁt organization sponsored by the National Cancer Institute, is conducting a national clinical trial of the gemcitabine plus cisplatin combination for treatment of relapsed ovarian cancer. It is not been used for ﬁrst-line treatment for ovarian cancer yet because it has not been proved that anything is more effective than platinum and Taxol. But assays can pro- vide valuable information for its selection as a second-line treatment. Lack of efﬁ- cacy of the drug could be due to the drugs’ inability to be delivered to the tumor or inappropriate levels of drug. In 50–60 % of the instances, a drug is not effective in vivo even though the in vitro assays predict efﬁcacy. ChemoFx Assay (Helomics) is an ex vivo assay designed to predict the sensitiv- ity and resistance of a given patient’s solid tumor to a variety of chemotherapy agents (Brower et al. A portion of a patient’s solid tumor, as small as a core biopsy, is mechanically disaggregated and established in primary culture where malignant epithelial cells migrate out of tumor explants to form a monolayer. Cultures are veriﬁed as epithelial and exposed to increasing doses of selected che- motherapeutic agents. The number of live cells remaining post-treatment is enumer- ated microscopically using automated cell-counting software. The resultant cell counts in treated wells are compared with those in untreated control wells to Universal Free E-Book Store Determination of Response to Therapy 225 generate a dose-response curve for each chemotherapeutic agent tested on a given patient specimen. Features of each dose-response curve are used to score a tumor’s response to each ex vivo treatment as “responsive,” “intermediate response,” or “non-responsive. A cell line from one person would be killed dramatically, while that from another person can be resistant to exposure to the anticancer agent. Because gene expression is the most accurate predictor of alkylation sensitivity, there are good prospects for translating these ﬁndings to a clinical set- ting to predict whether a tumor will respond to alkylation chemotherapy. Genomic Analysis of Tumor Biopsies Genomic Health Inc is developing a service to provide individualized genomic anal- ysis of tumor biopsies to physicians as a guide to treatment of patients with cancer. This approach is now being tested in clinical trials Universal Free E-Book Store 226 10 Personalized Therapy of Cancer on patients with breast cancer and lung cancer. This technology will allow physicians to tailor the treatment and prognosis for an individual patient, using a small panel of genes selected from thousands of genes. Genotype-Dependent Efﬁcacy of Pathway Inhibition in Cancer Therapeutic inhibition of genetically activated oncoproteins can induce massive apoptosis of tumor cells, which may lead to dramatic regression of cancer. However, efﬁcacy of downstream pathway inhibition is limited by release of negative feedback loops on the reciprocal pathway.
Short acting oral calcium channel blockers (verapam il or diltiazem ) and short acting beta blockers titrated against the patients response are m ost effective in this setting and likely to facilitate cardioversion buy tadora 20mg. If a patient w ith new atrial fibrillation is haem odynam ically com prom ised urgent cardioversion is required w ith full heparinisation purchase tadora 20mg otc. Like other class I agents (quinidine cheap 20mg tadora with mastercard, disopyram ide and procainam ide) discount tadora 20mg free shipping, flecainide is best avoided in patients w ith know n or possible coronary artery disease and in conditions know n to predispose to torsade de pointes. It should be noted that cardioversion is generally safe during digoxin therapy, so long as potassium and digoxin levels are in the norm al range. Functional and ionic m echanism s of antiarrhythm ic drugs in atrial fibrillation. Suzanna Hardman and Martin Cowie For years, the rationale for a period of anticoagulation prior to cardioversion w as that the anticoagulation w ould either stabilise or abolish any throm bus, the assum ption being that throm bo- em boli associated w ith cardioversion occurred w hen effective atrial contraction w as restored, dislodging pre-existing throm bus. Although this has becom e standard clinical practice it is not evidence-based and not w ithout hazard. In patients w ith non-rheum atic atrial fibrillation m ost atrial throm bi w ill have resolved after four to six w eeks of anticoagulation but persistent throm bus has been reported. Left atrial throm bus is present in a significant proportion of patients w ith recent onset atrial fibrillation and the associated throm bo- em bolic rate is sim ilar to that found in patients w ith chronic atrial fibrillation. Furtherm ore, cardioversion itself is associated w ith the developm ent of spontaneous contrast and new throm bus and, in the absence of anticoagulation, even those patients w ho have had throm bus excluded using transoesophageal echocardiography have subsequently developed sym ptom atic throm boem boli. For m ost patients a period of 4 to 6 w eeks of anticoagulation and a transthoracic echocardiogram prior to cardioversion w ill be sufficient. In certain patients there m ay be cogent argum ents for m inim ising the period of anticoagulation. In these patients transoesophageal echocardiography can be undertaken and provided no throm bus is identified w ill abolish the need for prolonged anticoagulation prior to cardioversion. How ever, all patients w ith atrial fibrillation need to be fully anticoagulated at the tim e of cardioversion and for a period thereafter. If atrial fibrillation has been present for several days only, norm al atrial function w ill usually be re-established over a sim ilar period and intravenous heparin for a few days post-cardioversion is probably adequate. Exclusion of atrial throm bus by trans- oesoophageal echocardiography does not preclude em bolism after cardioversion of atrial fibrillation. Left atrial appendage throm bus is not uncom m on in patients w ith acute atrial fibrillation and a recent em bolic event; a transoesophageal echocardiographic study. Suzanna Hardman and Martin Cowie Elective cardioversion should only be undertaken w hen the precipitant (e. W ith this proviso, the success of cardioversion depends not so m uch on the ability to restore sinus rhythm (success rates of 70–90% are usual), but rather on the capacity to sustain sinus rhythm. Cardioversion of unselected patients w ill result in consistently high rates of relapse: at one year 40 to 80% of patients w ill have reverted to atrial fibrillation. Early cardioversion, particularly in those patients in w hom a clear trigger of atrial fibrillation has been effectively treated and in w hom there is little or no evidence of concom itant cardiac disease, is associated w ith the best long term outcom e. The presence of severe structural cardiac disease is associated w ith a high relapse rate and som etim es an inability to achieve cardioversion, e. Certain categories of patients justify specific m ention: • O bese patients m ay be especially resistant to cardioversion from the external route but not necessarily using electrodes positioned w ithin the heart. If cardioverted their propensity to atrial fibrillation rem ains and they are likely to relapse. A long-term follow -up study of patients w ith post-thyrotoxic atrial fibrillation. Prediction of uneventful cardioversion and m aintenance of sinus rhythm from direct current electrical cardioversion of chronic atrial fibrillation and flutter. The risks include those relating to an, albeit brief, general anaesthetic w hich w ill reflect the overall health of the patient, and those relating to the application of synchronised direct current shock. The latter include the developm ent of bradyarrhythm ias (m ore likely in the presence of heavy beta blockade and especially w here there is concom itant use of calcium channel antagonists) and tachyarrhythm ias (m ore likely in the presence of deranged biochem istry including low serum K+ or M g++, and high levels of serum digoxin). These dysrhythm ias m ay necessitate em ergency pacing or further cardioversion and full resuscitation. Elective cardioversion of adequately assessed patients should only be undertaken by appropriately trained staff in an area w here full resuscitation facilities are available. Failure to observe these guidelines w ill likely result in higher com plication rates w hich on occasion includes death. There have been no random ised trials of anticoagulation but there is convincing circum stantial evidence that anti- coagulation reduces the risk of cardioversion-related throm bo- em bolism from figures in the order of 7% to less than 1% : anticoagulation does not appear to abolish the risk and this should be m ade explicit w hen inform ed consent is obtained from a patient. Suzanna Hardman and Martin Cowie Although com m on clinical practice and guidelines do not advocate routine anticoagulation of patients w ith atrial flutter undergoing cardioversion, there are no data to support this practice. Rather, recent studies suggest the prevalence of intra- atrial throm bus in unselected patients w ith atrial flutter is significant and of the order of 30–35% (com pared w ith 3% preva- lence in a control population in sinus rhythm ). The atrial stand- still (or stunning) that has been described post-cardioversion of atrial fibrillation and is thought to be a factor in the associated throm boem bolic risk has also now been described im m ediately post-cardioversion of patients w ith atrial flutter. Although som e authors argue that the stunning post-cardioversion of atrial flutter is “attenuated” com pared w ith the response in atrial fibrillation, the throm boem bolic rate associated w ith cardioversion of atrial flutter in the absence of anticoagulation argues against this. Indeed, the throm boem bolic rate appears to be com parable w ith the early experience of cardioverting atrial fibrillation. Furtherm ore, atrial flutter is an intrinsically unstable rhythm w hich m ay degenerate into atrial fibrillation and certain patients alternate betw een atrial fibrillation and atrial flutter. Like atrial fibrillation, atrial flutter m ay be the first m anifestation of underlying heart disease and it is likely, though not yet proven, that the throm boem bolic risks associated w ith both chronic atrial flutter and w ith cardioversion of atrial flutter vary w ith the extent of underlying cardiovascular pathology. Although existing data are lim ited, on current evidence w e advise that patients w ith atrial flutter should be anticoagulated prior to, during and post- cardioversion, in the sam e w ay as patients w ith atrial fibrillation. Prevalence of throm bus, spontaneous echo contrast, and atrial stunning in patients undergoing cardioversion 148 100 Questions in Cardiology of atrial flutter. Delayed restoration of atrial function after cardioversion of atrial flutter by pacing or electrical cardioversion. If the patient is aged less than 60 years, and has no evidence of other cardiac disease (such as coronary artery disease, valve disease or heart failure) the risk of throm bo- em bolism is low (of the order of 0. This risk is low er than the risk of a serious bleed if the patient is anticoagulated w ith w arfarin (1. If the patient is older than the 60 years, or has evidence of other cardiovascular disease, the risk of throm boem bolism increases. In the Stroke Prevention in Atrial Fibrillation Study clinical features indicating a higher risk of throm boem bolism w ere: age over 60 years; history of congestive heart failure w ithin the previous 3 m onths; hypertension (treated or untreated); and previous throm boem bolism. The m ore of these features present in a patient the higher the risk of throm boem bolism. Paroxysm al (as opposed to chronic) atrial fibrillation covers a w ide spectrum of disease severity w ith the duration and frequency of attacks varying m arkedly betw een and w ithin patients. Although the clinical trials of anticoagulation in patients w ith atrial fibrillation w ere inconsistent in including patients w ith paroxysm al atrial fibrillation, there w as no evidence that such patients had a low er risk of throm boem bolism than those w ith chronic atrial fibrillation. It is likely that as the episodes becom e m ore frequent and of longer duration that the risk approaches those in patients w ith chronic atrial fibrillation. Suzanna Hardman and Martin Cowie The ability of echocardiography to detect left atrial clot is determ ined by the sophistication of the equipm ent, the ease w ith w hich the left atrium and left atrial appendage can be scanned and the skill and experience of the operator. Historically, at best, the sensitivity of tw o dim ensional transthoracic echo- cardiography for detecting left atrial throm bus has been of the order of 40–65% , w ith the left atrial appendage visualised in under 20% of patients even in experienced hands. This com pared w ith a reported sensitivity of 75–95% for visualising left ventricular throm bi from the transthoracic approach. M ore recent data, from a tertiary referral centre using the new gener- ation transthoracic echocardiography, suggest the left atrial appendage can be adequately im aged in 75% of patients and that w ithin this group 91% of throm bi identified by trans- oesophageal echocardiography w ill also be visualised from the transthoracic approach. Although encouraging, the extent to w hich these figures can be reproduced using sim ilar equipm ent by the generality of units rem ains to be established. Available data for the sensitivity of transoesophageal echo- cardiography in detecting left atrial and left atrial appendage throm bus consistently report a high positive predictive value. The largest series of 231 patients identified throm bus ranging from 3 to 80m m in 14 patients: com pared w ith findings at surgery this produced a sensitivity of 100%. But these findings need to be interpreted w ith considerable caution and are unlikely to be ap- plicable to all users of the technique. The study w as carried out in a tertiary referral centre w ith a particular interest and long-standing investm ent in the technique and the nine observers involved in reporting the data all had extensive experience. Nonetheless, transoesophageal echocardiography is undoubtedly the investi- gation of choice for im aging the left atrium and left atrial appendage. Transoesophageal tw o- dim ensional echocardiography for the detection of left atrial appendage throm bus. Accuracy of trans- oesophageal echocardiography for identifying left atrial throm bi. Im aging of throm bi and assessm ent of left atrial appendage function: a prospective study com paring trans- thoracic and transoesophageal echocardiography. Diana Holdright Approxim ately 80% of strokes are ischaem ic in origin, of w hich 20–40% have a cardiac basis. Com m on cardiac abnorm alities associated w ith neuro- logical events include atrial fibrillation, m itral valve disease, left atrial enlargem ent, left ventricular dilatation, prosthetic valve abnorm alities and endocarditis. The aim of echocardiography is to confirm the presence of im portant predisposing cardiac abnorm alities and in younger patients, typically <50 years, to look for rare cardiac causes that m ight not be detected by other m eans. Consequently, echocardiography is particularly useful in patients at both ends of the age scale. Superiority of trans- oesophageal echocardiography in detecting cardiac source of em bolism in patients w ith cerebral ischaem ia of uncertain aetiology. It is a vestige of the fetal circulation, w ith an orifice varying in size from 1 to 19m m , allow ing right-to- left or bidirectional shunting at atrial level and the potential for paradoxical em bolism. The detection of venous throm bosis is not w ithout difficulty and venous throm bi m ay resolve w ith tim e, such that a negative study does not exclude prior throm bosis. There are no com pleted prospective trials com paring aspirin, w arfarin and percutaneous closure to guide m anagem ent of patients w ith an ischaem ic stroke presum ed to be cardioem bolic in origin.