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A noninvasive test of respiratory work in COPD exacerbations that might be helpful
Murphy et al report a pilot study in which they used parasternal electromyography (noninvasive electrode over the 2nd intercostal space) to measure respiratory work in 30 subjects admitted for acute exacerbations of COPD. The so-called neural respiratory drive index predicted clinical recovery and identified patients destined to be readmitted within 14 days. Thorax 2011;66:602-608.