Select the correct answer. A pleural rub occurs only with inspiration and clears with coughing. A pleural rub occurs only with expiration, and pericardial rub is continuous.
Crackles usually occur during inspiration.
Crackles are unaffected by coughing. Crackles are heard only in the central airways Crackles occur during inspiration and expiration. Pulmonary emboli, fluid in the pleural space, bronchoconstriction. Pulmonary emboli, fluid in the alveoli, bronchoconstriction. Pulmonary emboli, fluid in the pleural space, secretions which narrow the bronchioles leading to the alveoli.