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What is the primary action of Phosphodiesterase 4 inhibitors like roflumilast?
Preventing acute bronchospasm
Treating acute bronchospasm
Preventing cough and excess mucus
Treating myocardial infarction
The correct answer is: Preventing cough and excess mucus
Phosphodiesterase 4 inhibitors like roflumilast primarily work by preventing cough and excess mucus. This is because they inhibit the enzyme PDE4 which is responsible for breaking down cAMP, a messenger molecule that plays a crucial role in regulating respiratory function and secretion of mucus. This leads to reduced inflammation and mucus production in the airways, making it an effective treatment for chronic obstructive pulmonary disease (COPD). The other options are incorrect because although these inhibitors may have some secondary effects on bronchospasm or myocardial infarction, they are not their primary function.