Fig. 1
The ‘three-concave sign’ is positive. ① superior sternal fossa; ② supraclavicular fossa; ③ Intercostal space; ④ The right vocal cord is constricted; ⑤ The airway is obstructed
Fig. 1 | BMC Anesthesiology
The ‘three-concave sign’ is positive. ① superior sternal fossa; ② supraclavicular fossa; ③ Intercostal space; ④ The right vocal cord is constricted; ⑤ The airway is obstructed