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O. Thorek, M.A., M.D., M.P.H.
Assistant Professor, University of Mississippi School of Medicine
Geographic Distribution and Occurrence: the most common gnathostomiasis is caused by G. Cases of human infection also have been described in Argentina and Ecuador (Ollague et al. The highest concentration of human cases has been in Thailand and Japan, where hundreds of patients are reported every year. The human infection is infrequent or rare in China, India, Indochina, Indonesia, and Malaysia. In the markets of Thailand, larvae were found in 37% of fish, 80% of eels, and 90% of frogs. A study of 3,478 pigs carried out in China in 1991 found the infection in 15% of them. Of 38 species of animals that serve as intermediate or paratenic hosts, 23 are shared with G. The first case was reported in 1989, and 25 cases had been reported by 1997: 23 cutaneous, 1 pulmonary, and 1 colonic (Nawa et al. The Disease in Man: Man is an aberrant host in which the parasite only exceptionally reaches sexual maturity: the larva continuously migrates and does not become established in the human stomach. The most common symptoms are localized, intermittent, and sometimes migratory swelling of the skin, often accompanied by pain, pruritis, and erythema. The first symptoms appear one or two days after the ingestion of raw fish or the meat of paratenic hosts, such as chickens and ducks. The symptoms include nausea, salivation, urticaria, pruritis, and stomach discomfort; mild leukocytosis and very marked eosinophilia are common. Later, the symptoms are due to the migration of the larva into the liver and other organs. The movements of the larva inside the abdominal or thoracic organs can cause acute pain of limited duration. The symptoms resemble cholecystitis, appendicitis, cystitis, or other diseases, depending on the organ affected by the larvae (internal or visceral gnathostomiasis). Approximately one month after the infective food is eaten, the larva locates in the subcutaneous tissue, usually of the abdomen, extremities, head, and chest. This is the beginning of the chronic phase, in which the organic symptoms abate or disappear and eosinophilia gradually decreases. The most prominent symptom is an intermittent subcutaneous edema that changes location each time the larva moves. The edema is pruriginous but not painful, and initially lasts a week or more; its duration then becomes progressively shorter. In its erratic migration, the larva can affect a variety of different organs and tissues. When it penetrates the skin, it can cause a clinical picture similar to that of cutaneous larva migrans (see the chapter on that disease). There was just one ocular case, and 75% of the patients developed peripheral eosinophilia. Biopsies were negative, but two days later blisters appeared on the lower abdomen, and a nematode was obtained from one of them. All the lesions began to shrink on the 25th day and had disappeared by day 30 (Akahane et al. Intraocular gnathostomiasis is rare and should be differentiated from that caused by filariae or Angiostrongylus; up until 1994, just 12 cases had been found (Biswas et al. In the adult stage, the parasite lodges in the stomach wall, where it produces intense inflammation, with the formation of cavities full of serosanguineous fluid that become fibrous cysts. When the fistules open onto the peritoneum, they can cause severe peritonitis (Barriga, 1997). The disease is infrequent but, when it occurs, it manifests with anorexia and weight loss.
The most recent randomized controlled trials have found that heliox-driven albuterol may be a useful adjunct therapy for adult asthma patients with severe asthma exacerbation after other therapies have been attempted. Current studies have shown that albuterol nebulized with heliox offers no clinical benefit over standard therapy in severe pediatric asthma. The mixture (typically 70% helium, 30% oxygen) limits its use in hypoxic patients. Long-Acting Beta Agonists Long-acting beta-adrenoceptor agonists (more specifically beta agonists, with duration > 8-12 h) are usually prescribed for moderate-to-severe persistent asthma in the chronic management setting. They are designed to reduce the need for short-acting beta agonists, as they have a duration of action of approximately 12 hours, making them candidates for sparing high doses of corticosteroids. Statistically significant improvements in partial pressure of oxygen and stethoscopic evaluations were noted. Further studies to assess whether it may be useful in the critically ill are needed before conclusions can be drawn. Leukotriene Inhibitor Agonists Leukotriene inhibitor agonists have effects on multiple pathways including bronchoconstriction, inflammatory cell recruitment, vascular leakage, mucus production, and airway remodeling. A recent Cochrane review stated that the current evidence does not support the routine use of leukotriene inhibitor agonists in acute asthma. The review cited the lack of high-quality trials involving children and the variable end-point measurements as the reasons for not supporting routine use at this time; however, they did note that further studies need to be done before conclusions can be drawn. Family psychosocial problems and financial problems are associated with increased risk of mortality for patients aged > 31 years but not for younger patients. Males were at increased risk of mortality from asthma exacerbation overall, but females with family problems are at greater risk than males with family problems. Alcohol use increased the risk of mortality for individuals who received only verbal instructions without a written action plan. Long-acting beta agonists added to inhaled corticosteroids reduces asthma-related hospitalizations compared to inhaled corticosteroids alone, and there is no statistical increase in mortality. However, longacting beta agonist treatment without inhaled corticosteroids does increase mortality risk in asthma. Healthcare providers must understand the essential need for adequate dosing of inhaled corticosteroids to control airway inflammation. A provider treating patients with steroids must be diligent in explaining the potential side effects of steroids. The informed consent process, documentation, and close monitoring of patients are critical to avoid potential litigation. Standard medical treatment of acute asthma does not increase the risk of congenital anomalies in the offspring when taken during the first trimester of pregnancy. The intervention groups also required less beta agonist treatments, with no adverse events noted. The oral formulation had similar effects, with a mean improvement of 16% and peak effects seen within 2 hours (compared to a mean 8% improvement in the placebo arm). The intent-to-treat analysis for hospital admission had an 18% admission rate in the intervention group versus 63% in the control group. If this technology is going to be employed, reaching for it early will likely yield more benefit. However, capnography is not a replacement of blood gas as an accurate means of assessing alveolar ventilation in acute asthma. Though the use of nebulized magnesium sulfate appears to produce benefits for adults, the routine use of this form of magnesium sulfate should not be considered standard of care at this point. Current literature suggests that early administration decreases hospitalization rates and bounce-back rates. When treating for acute exacerbations, steroid therapy should be administered early. Additionally, lack of historical risk factors does not equal lack of morbidity and mortality risk. Waiting to intubate when intubation is clinically indicated will lead to increased likelihood of procedural complications and respiratory arrest. We recommend that only the most experienced provider perform the procedure, given the increased need for firstpass success. Several studies have demonstrated feasibility and safety in the pediatric population.
Syndromes
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- Coma
- Often loses toys, assignments, pencils, books, or tools needed for tasks or activities
- Nausea or vomiting
- Eliminate tobacco smoke from the home. This is the single most important thing a family can do to help someone with asthma. Smoking outside the house is not enough. Family members and visitors who smoke outside carry smoke residue inside on their clothes and hair. This can trigger asthma symptoms. If you smoke, now is a good time to quit.
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- Loss of concentration
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- Meeting new people