During cardiopulmonary resuscitation of a patient, in addition to impaired function of vital organs such as the heart and brain, prolonged chest compressions or incorrect compressions can often lead to pulmonary contusion, resulting in hemoptysis in the patient, the latter making airway management more difficult, tissue hypoxia and organ damage further aggravated. Hemoptysis due to pulmonary contusion can sometimes be encountered during CPR. The large amount of blood that fills the alveoli reduces the effective breathing area; the trachea is filled with blood, which can increase the ventilation resistance; and the gushing bloody fluid also affects the normal use of the ventilator. Therefore, it is very difficult to handle clinically. Inspired by the use of epinephrine for surgical trauma hemostasis, epinephrine is diluted and administered through the trachea, and several large tidal volume ventilation is performed to increase the distribution area of the drug, thus causing vasoconstriction at the site of injury and achieving hemostasis. This is a guide to the management of complications in clinical cardiopulmonary resuscitation. Beveridge WIB has stated that, all else being equal, the richer the treasure of knowledge, the greater the likelihood of making important associations. Original insights are likely to arise if one has a broad knowledge of related or even distantly related disciplines. As Taylor EL points out, “people with a wealth of knowledge and experience are more likely to generate new associations and original insights than people with only one.” Scientists who have made important original contributions are often people with a wide range of interests or who have studied subjects outside their specialization. Originality often lies in the discovery of connections or similarities between two or more objects of study or ideas that were thought to be unrelated to each other. In short, broad knowledge is the basis for making associations.