A Randomized controlled study on the safety and efficacy of micro hyperbaric oxygen therapy in patients with severe COVID-19 infection

INTERVENTION: experimental gruop:micro hyperbaric oxygen therapy + routine courese;control gruop:routine course; CONDITION: COVID‐19 PRIMARY OUTCOME: WHO Clinical Progress Scale; SECONDARY OUTCOME: Viral load (CT vale);Routine blood;interleukin‐6;interleukin‐1beta;C‐reactive protein;TNF‐alpha;d‐dimer;Serum IgE;Serum IgG;lung imagine;duration of hospitalization;Arterial Blood Gas; INCLUSION CRITERIA: 1. Age between 18 90 years old 2. Criteria for severe COVID‐19 are met 3. Able to complete the operation of the micro hyperbaric chamber as required under guidance 4. No absolute contraindication to hyperbaric exposure 5. Sign the informed consent form