EMT Basic Certification Complete Practice Exam 2025

Crackles, also known as rales, are abnormal lung sounds often associated with various conditions affecting the lungs and airways. They typically indicate the presence of fluid or inflammation within the airways or alveoli.

Pulmonary edema, which involves the accumulation of fluid in the lung's air sacs, commonly presents with crackles due to the fluid's impact on lung function. In chronic bronchitis, especially during exacerbations, mucus build-up can cause crackles as well. Congestive heart failure (CHF) frequently leads to pulmonary congestion and fluid overload, resulting in crackles.

Asthma, on the other hand, is primarily characterized by wheezing due to bronchoconstriction and inflamed airways, not by the presence of crackles. While asthma can cause some abnormal lung sounds, crackles are not a typical feature of this condition. Therefore, among the options given, asthma is the condition not commonly associated with crackles or rales.