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Osmolality changes in nebulizer solutions.

M H Schöni¹, R Kraemer

¹Dept of Pediatrics, University of Beme, Inselspital CH-3010, Switzerland.

The European Respiratory Journal

|October 1, 1989

Summary

Nebulizer solutions can change osmolality during use, potentially causing adverse effects in asthma patients. These osmotic changes in the nebulizer and airstream depend on drug mixtures and solution volume.

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Area of Science:

Respiratory Medicine
Pharmaceutical Science
Clinical Pharmacy

Background:

Paradoxical bronchoconstriction after beta2-mimetic inhalation in asthmatic children has been linked to nebulizer solution osmolality and pH.
Understanding these changes is crucial for safe and effective asthma management.

Purpose of the Study:

To investigate osmolality changes in commercially available nebulizer solutions during nebulization.
To determine how drug mixtures and nebulization duration affect osmolality in the nebulizer cup and airstream.

Main Methods:

Measured osmolality of various nebulizer solutions (saline, salbutamol, terbutaline, fenoterol, disodium cromogylcate, beclomethasone dipropionate) before and after nebulization.
Analyzed osmolality in the nebulizer chamber and airstream using two types of jet nebulizers over 5, 10, and 15 minutes.
Tested different drug mixtures, including beta2-agonists with saline, disodium cromogylcate, or beclomethasone dipropionate.

Main Results:

Osmolality increased significantly in normal saline and beta2-agonist solutions mixed with saline after 10-15 minutes of nebulization.
Isotonic solutions (salbutamol, terbutaline) and hypotonic solutions (fenoterol, disodium cromogylcate, beclomethasone dipropionate, salbutamol respirator solution) were identified.
Mixtures of beta2-agonists with disodium cromogylcate or beclomethasone dipropionate remained hypo-osmolar, unlike those with saline.

Conclusions:

Nebulization for 10-15 minutes induces significant osmotic changes in the nebulizer cup and airstream.
These osmolality alterations are dependent on the specific drug formulations and their mixtures.
Findings highlight the potential for osmolality-induced adverse effects in inhaled asthma therapies.

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