Correlations Between Theophylline Concentrations in Plasma, Erythrocytes and Cantharides-induced Blister Fluid and Peak Expiratory Flow in Asthma Patients
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Theophylline levels in plasma, erythrocytes and cantharides-induced blister fluid (BF) have been correlated with peak expiratory flow (PEF) in asthmatic patients. Nine asthmatic men received an IV infusion of 240 mg theophylline at a constant rate for 30 min. The theophylline concentrations in erythrocytes and blister fluid were 37% and 78% of those in plasma. There was not a strong correlation between erythrocyte or blister fluid penetration and the clinical effect of theophylline.
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