is是不是应该改成in

Patients with PS are considered to have a full stomach and, although some practitioners perform them occasionally, mask inductions are generally not considered the safest induction technique is these patients. RSI is the preferred method of intubating patients with PS [46]. Awake intubations can be done safely, and may be an ideal alternative to RSI when a patient appears to have a difficult airway. Though Cook-Sather et al. [42] found that a modified RSI did not prevent oxygen desaturation, a simulation study by Eich et al. [47] found that a “controlled RSI” (non-depolarizing muscle relaxation and mask ventilation with CP) prevented hypoxemia and this in turn reduced operator stress and lead to fewer unsafe actions.

is是不是应该改成in