[197] Complications and Dangers of Esophagoscopy for Foreign Bodies. Asphyxia from the pressure of the foreign body, or the foreign body plus the esophagoscope, is a possibility (Fig. 91). Faulty position of the patient, especially a low position of the head, with faulty direction of the esophagoscope may cause the tube mouth to press the membranous tracheo-esophageal wall into the trachea, so as temporarily to occlude the tracheal lumen, creating a very dangerous situation in a patient under general anesthesia. Prompt introduction of a bronchoscope, with oxygen and amyl nitrite insufflation and artificial respiration, may be necessary to save life. The danger is greater, of course, with chloroform than with ether anesthesia. Cocain poisoning may occur in those having an idiosyncrasy to the drug. Cocain should never be used with children, and is of little use in esophagoscopy in adults. Its application is more annoying and requires more time than the esophagoscopic removal of the foreign bodies without local anesthesia. Traumatic esophagitis, septic mediastinitis, cervical cellulitis, and, most dangerous, gangrenous esophagitis may be present, caused by the foreign body itself or ill-advised efforts at removal. Perforation of the esophagus with the esophagoscope is rare, in skillful hands, if the esophageal wall is sound. The esophageal wall, however, may be weakened by ulceration, malignant disease, or trauma, so that the possibility of making a false passage should always deter the endoscopist from advancing the tube beyond a visible point of weakening. To avoid entering a false passage previously created, is often exceedingly difficult, and usually it is better to wait for obliterative adhesive inflammation to seal the tissue layers together.