55、 A 45-year-old male patient received laparoscopic cholecystectomy. After60-min CO2 insufflation, intra-abdominal pressure was 14 mmHg.End-tidal CO2 was found to increase from 30 to 50 mmHg. SpO2 was 80%with airway pressure soared up to 40 cm H2O. Physical examinationshowed a reduction of breathing sound with hyperresonance over the rightlung. In addition, slight swelling and crepitus were noted over anteriorchest wall. The most likely diagnosis is:
(A) Endobronchial intubation
(B) Massive CO2 embolism
(C) Pneumothorax
(D) Capnothorax
(E) Subcutaneous emphysema