What primary purpose does a hand-held nebulizer serve?

A hand-held nebulizer is primarily used to hydrate thick sputum and help prevent mucus plug formation. This device converts liquid medication or saline into a fine mist that can be inhaled directly into the lungs. By humidifying the airways, it loosens mucus, making it easier for patients to expectorate and clear their airways, which is especially beneficial for individuals with respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), or cystic fibrosis.

The other options, while they may relate to certain aspects of respiratory therapy, do not accurately reflect the primary purpose of a hand-held nebulizer. For instance, increasing the flow rate of oxygen is not a function of a nebulizer; instead, it is designed for aerosolizing medications. Additionally, while nebulizers can supplement inhaler use, they are not meant to completely replace metered dose inhalers, as each has its own indications and advantages. Finally, while nebulizers can deliver oxygen when used with supplemental oxygen setups, their primary function is not to provide consistent oxygen therapy but rather to aerosolize therapeutic agents.