Which patients are not suitable for painless consultation? 1, mental abnormality, uncooperative people; 2, short neck obesity, sleep apnea history or symptoms; 3, obvious difficult airway; 4, patients with respiratory tract infections, such as: colds, pneumonia, etc.; 5, a history of high blood pressure, blood pressure more than 150/100mmHg, not effectively controlled; 6, a history of cerebral infarction or cerebral hemorrhage for less than three months; 7, whooping dysfunction, need to test the lung function, if there are Severe ventilation/ventilation dysfunction, should not receive painless gastroenteroscopy before effective treatment; 8, serious electrolyte disorders have not been corrected, especially potassium ≤ 3,2mmol / L or ≥ 5,8mmol / L; 9, a clear history of angina pectoris and in the last two months there are still authors; 10, a history of heart disease is untreated, accompanied by cardiac insufficiency; 11, ultrasonography diagnosis of cardiac structure Serious malformations, such as aortopathy, tetralogy of Fallot, huge atrial septal defects, etc.; 12, those who are obviously distrustful of or resistant to anesthesia with painless techniques; 13, those who have insufficient time for fasting and water fasting (anesthesia requires fasting ≥ 6h, water fasting ≥ 4 hours); 14, all patients need to have an ECG diagnosis, and the following are contraindications that need to be relieved by treatment before reexamination: (1) ST-segment downward shift (1) ST-segment downward shift ≥0, 1mV; (2) sinus bradycardia (pathologic), sinus block and sinus standstill; (3) degree II, type II and degree III atrioventricular block or coronary artery disease with left bundle-branch block; (4) atrial flutter and atrial fibrillation with rapid ventricular rate, and untreated; (5) non-sinus tachycardia; (6) frequent or multifarious premature ventricular, the phenomenon of RonT; (7) non-existing myocardial infarction; (8) pre-stimulation syndrome (WPW type), and the presence of a myocardial infarction; (9) the presence of a myocardial infarction. syndrome (WPW type) in combination with atrial fibrillation; (9) characteristic ECGs with low and high potassium; other conditions that may cause serious complications or have a higher potential risk. The above typical ECG abnormalities, especially those listed in Article 14, should be treated by a cardiologist before making a decision.