A difficult airway is defined as a clinical situation in which a trained anesthesiologist has difficulties to ventilate a patient with a face mask, difficulties for endotracheal intubation, or both. Intubation with a double lumen tube (DLT) may be more difficult than an equivalent intubation with a single-lumen tracheal tube because of its greater external diameter, stiffness and concavity, so its use is not recommended as a technique of initiation in patients with VAD [1].
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