2.2 Treatment
All patients underwent laboratory tests, electrocardiogram and neck CT. According to the clinical manifestations, signs, neck CT examination and general physical conditions of patients, individualized treatment plan was made. All patients were initially treated with amoxicillin/clavulanic acid and metronidazole, and then adjusted according to culture and sensitivity reports. If the abscess has been formed in a large area, the abscess should be cut and drained as soon as possible according to the scope of the abscess. Vascular forceps were used for blunt separation and wide opening of the abscess cavity. Fingers were used to explore and open the dangerous abscess cavity, so as to facilitate the full drainage of the pus. The abscess cavity were repeatedly washed with hydrogen peroxide, diluted complex iodine and normal saline. The dressing was changed daily to wash the pus cavity, and the drainage gauze was placed in the traditional treatment group. The dressing was changed twice a day if too more pus in the cavity and then reduced according to the situation until the incision healed. In the pyogenic cavity aerobic therapy + negative pressure drainage group, the patients were treated with oxygen therapy in the pus cavity (oxygen flow tube was placed in the pus cavity) after the operation. The oxygen flow rate was 1-4 L/min, 18-24 h/day. When there was no obvious purulent secretion, the incision was sutured and negative pressure drainage was placed. The color of the drainage fluid was observed every day. When the color of the drainage fluid is clear and less than 10 mL, the negative pressure drainage was removed. Tracheotomy was performed according to the patient’s respiratory condition and the scope of abscess. If the abscess has not yet formed or formed in a small range, it should be paid close attention to the condition, actively anti-inflammatory, strengthen nutritional treatment, and adjust the treatment plan according to the change of the condition.