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- W1966644581 abstract "Many preservatives commonly included in nasal drops and sprays are known to impair mucociliary clearance. We studied the effects of four frequently used preservatives on ciliary beat frequency (CBF) in respiratory tissue. Sodium metabisulfite and chlorbutol did not change the CBF at concentrations up to 50 mg/L in rat tracheal mucosa. Chlorocresol 25 mg/L and 50 mg/mL reversibly decreased CBF (by 33% and 68%, respectively) in 60 minutes. Benzalkonium chloride impaired CBF irreversibly already at a relatively low concentration (12.5 mg/L). To further clarify these results, we studied the effects of the most ciliotoxic (benzalkonium chloride) and nonciliotoxic (chlorbutol) preservative on guinea pig tracheal epithelium and human nasal mucosa. Although chlorbutol had no effect on the CBF, a dose-dependent decrease on CBF was seen in guinea pig and human ciliated epithelium during their immersion in benzalkonium chloride. At a concentration of 50 mg/L it stopped the ciliary activity in 40 minutes in guinea pig trachea, and in human nasal mucosa, benzalkonium chloride concentrations of 25 and 50 mg/L, decreased the CBF irreversibly (by 28% and 60%, respectively) in 60 minutes. These results suggest that chlorbutol is a safe and well tolerated preservative. Banzalkonium chloride is ciliostatic in vitro to rat, guinea pig, and human respiratory mucosa. Therefore, prolonged clinical use of benzalkonium chloride may impair mucociliary clearance, a major defense respiratory mechanism." @default.
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- W1966644581 date "1996-05-01" @default.
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- W1966644581 title "Effects of Some Preservative Agents on Rat and Guinea Pig Tracheal and Human Nasal Ciliary Beat Frequency" @default.
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- W1966644581 doi "https://doi.org/10.2500/105065896781794932" @default.
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