CT Diagnosis of 20 Cases of Common Bile Duct Stones and Acute Pancreatitis: The upward invasion along tissue spaces and lymphatic retroperitoneal movement invades the stomach and duodenum, leftward invasion towards the spleen. CT showed low-density uneven soft tissue with multiple unclear boundaries. 3.6 CT performance near the obstruction side, especially for such as low-density stones by TLC zoom scan and reasonable use of window width and technology, a careful analysis of the bile duct wall and the cavity's small morphological changes, will contribute to further improving the accuracy rate of qualitative diagnosis, according to the sub-type of acute pancreatitis, providing a reliable basis for preoperative surgical planning and treatment. (424) 3 Discussion: Oxygen is an indispensable material for maintaining life activities; oxygen is the basic means of treating hypoxia caused by various factors. The stuffy oxygen method, nasal vestibule oxygen method, and the oxygen tube are based on the physiological characteristics of a person’s nostrils, using soft plastic stuck in the nose to make the tube less likely to fall off. The oxygen tube placed in the nasal vestibule has a length of about Icm, causing little irritation and having a filtering cleaning function. Oxygen inhalation through the nasal mucous sputum cleaning action stimulates the patient’s respiration minimally, unlikely to cause irritative cough, and facilitates the patient receiving oxygen therapy. Nasal catheter oxygen of the nasopharynx oxygen method involves an oxygen tube made of rubber or plastics, with an insertion length of 2/3 from the earlobe to the tip of the nose, approximately 8 to 12cm. Inhalation of oxygen without the filter of the nose and mucous sputum cleaning action, coupled with the stimulating effect of the oxygen tube itself, can easily cause irritative cough, making it difficult for patients to receive oxygen. Some patients arbitrarily pull out all or part of the nasal catheter, causing ineffective oxygen supply, which is more prominent in patients with pulmonary heart disease, respiratory failure, and those requiring long-term oxygen therapy. Advanced uremic patients or patients with blood diseases are often accompanied by severe anemia and require oxygen therapy. In uremic patients, due to some toxins causing peripheral destruction of platelets increased, decreased platelet aggregation and adhesion, resulting in a decrease in the number and abnormal quality of platelets, prone to skin and mucosal bleeding. Blood disease patients have decreased platelet count, dysfunction, and reduced coagulation factor, also prone to skin and mucosal bleeding. The nasal catheter oxygen method inserts the tube to two-thirds the length from the nose to the earlobe, replacing the nasal cannula every 8 hours, increasing repeated intubation and extubation damage to the nasal mucosa of patients, thus making them more susceptible to nasal injury hemorrhage. Stuffy oxygen method inserts the catheter length of about Icm and replaces the catheter every 24 hours, causing less damage to the nasal mucosa and unlikely to cause nasal injury hemorrhage. In two cases where the diagnosis was not confirmed upon admission in patients with severe anemia, severe epistaxis occurred after nasal catheter oxygen, which was replaced by the stuffy oxygen method, stopping the epistaxis; the patient was diagnosed with uremia two days later. Higher vagal tone can cause atrioventricular block and arrhythmia. Conventional nasal catheter oxygen method inserts a length of 8-12cm; if operated carefully not to insert too long to stimulate the pharyngeal nerve fans, increasing vagus nerve excitability, causing arrhythmia; the stuffy oxygen method inserts a length of 1cm, and therefore has no such danger. In summary, nasal congestion oxygen is simpler and more convenient than the nasal catheter oxygen method, safe and effective, especially suitable for patients with a tendency to bleed, unknown diagnosis, severe anemia, and those requiring long-term oxygen therapy.