What are the relevant tests required when suffering from poorly dilated esophageal peristalsis and barium retention in the pyriform fossa: Gastroesophageal reflux determination and imaging: mainly used for GERI diagnosis, with a sensitivity of about 90%. When there is gastroesophageal reflux, gastroesophageal reflux imaging is seen as radioactivity above the cardia with GERI > 4%. Add 37-74 MBq (1-2 mCi) of 99mTc-SC or 99mTc-DTPA to 300 ml of acidic beverage. adult subjects fast for 4 h or more, wear a pressure lap band on the abdomen, drink the prepared beverage within 3 min, and pressurize the abdomen in steps from 0 to 13.3 kPa, and visualize once for each pressurization. Esophageal 24h pH monitoring: Using the pH gradient method, the lower electrode of the pH monitor lead was placed at 5 cm from the upper edge of the lower esophageal sphincter and the upper electrode of the lead was placed at 20 cm from the upper edge of the lower esophageal sphincter, and the changes of esophageal pH were recorded continuously for 10, 12 and 24 h to understand the acidity and alkalinity of the esophagus. The general monitoring time is 18h or more. It is used for patients suspected of having reflux esophagitis. Barium esophageal fluoroscopy: It is used to detect diseases in the esophagus by using fluoroscopy to observe the condition in the esophagus after the patient has taken a barium meal. Before the examination, the doctor will ask for a gas-producing powder (powder, which can be taken with a small amount of water). During the examination, the patient stands on the X-ray gastrointestinal machine, takes the barium sulfate suspension (sweetened and tastes fine) according to the doctor’s request, and rotates in different positions on the machine to facilitate the doctor’s selection of the angle for the film. Autoantibodies: Autoantibodies for DM/PM are divided into 3 categories, among which autoantibodies related to DM/PM diagnosis have high specificity but poor sensitivity and low detection rate. Serum muscle enzymes: creatine kinase (CK), glutamate aminotransferase (AST), lactate dehydrogenase (LDH), alanine aminotransferase (ALT), and aldolase (ALD) are elevated when myositis is active, among which CK has the highest sensitivity and can be elevated at the beginning of the disease, and decreased when the disease starts to stabilize and clinical symptoms have not yet improved, and has relative specificity, so it is important for diagnosis, guiding treatment and estimating prognosis. Therefore, it is of great importance for diagnosis, guiding treatment and estimating prognosis. Since more than 95% of CK comes from skeletal muscle, CK-MM is the most important component of CK, so it is not necessary to add the isoenzyme in the diagnosis of DM/PM; the isoenzyme CK-MB can also be elevated, but CK-MB/total CK>80ng/U should be suspected of myocardial involvement; CK-BB should be measured when smooth muscle involvement is suspected. After the disease is controlled, the enzyme measurement value decreases. Since DM/PM can be accompanied by liver damage, if CK decreases after treatment and other enzymes do not change significantly, it should be analyzed specifically and should not be considered as ineffective. Among all muscle enzymes, LDH is the slowest to recover and can be higher than normal when the clinical symptoms are clearly improved and other laboratory indicators are normalized.