Resp Care
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In 2002 the National Asthma Education and Prevention Program published evidence-based guidelines for the diagnosis and management of asthma, but there are some unresolved asthma-management issues that need further research. For asthmatic children inhaled corticosteroids are more beneficial than as-needed use of beta(2) agonists, long-acting beta(2) agonists, theophylline, cromolyn sodium, nedocromil, or any combination of those. Leukotriene modifiers are an alternative but not a preferred treatment; they should be considered if the medication needs to be administered orally rather than via inhalation. ⋯ The asthma care plan should include a written asthma action plan for the patient, but there is inadequate evidence as to whether the asthma action plan should be based on symptoms or on peak flow monitoring. There is low-level evidence that helium-oxygen mixture (heliox) may be of benefit in the first hour of an acute asthma attack but less advantageous after that first hour. Metered-dose inhalers are no more or less effective, overall, than other aerosol-delivery devices for the delivery of beta(2) agonists or inhaled corticosteroids, so the least expensive delivery method should be chosen.
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This report explores the efficacy of existing therapies for acute lung injury (ALI) and acute respiratory distress syndrome (ARDS), primarily in terms of clinically important outcomes such as the duration of mechanical ventilation and hospital mortality. Of the 15 therapies reviewed, the strongest evidence suggests that ALI/ARDS should be managed with a low-tidal-volume, pressure-limited approach, with either low or moderately high positive end-expiratory pressure. ⋯ However, there is relatively strong evidence to support conservative fluid management and high-fat, anti-oxidant nutritional formulations. Although most pharmacologic ALI/ARDS therapies have been ineffective, high-dose methylprednisolone is indicated in the subgroups of ALI/ARDS patients who have pneumonia or are at risk of ARDS due to fat embolization.
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Noninvasive positive-pressure ventilation (NPPV) is increasingly being used in the care of patients suffering acute respiratory failure. High-level evidence supports the use of NPPV to treat exacerbation of chronic obstructive pulmonary disease (COPD). NPPV has also been successfully used with selected patients suffering acute hypoxemic respiratory failure and to allow earlier extubation of mechanically ventilated COPD patients. ⋯ Any ventilator and ventilator mode can be used to apply NPPV, but portable pressure ventilators and pressure-support mode are most commonly used. Inhaled bronchodilators can be administered during NPPV, and NPPV can be delivered with helium-oxygen mixture. Institution-specific practice guidelines may be useful to improve NPPV success.