3. 15 and 30 minutes after discharge from the operating theatre. The physician who will perform the ultrasound scan will be different from the one who involved with administration of the drug for NMB reversal and the former will be blinded with respect to treatment received by patients. It is likely that, despite a TOF value greater than 0.9, higher diaphragm recovery will occur earlier and last longer when reversal of the NMB is achieved using Sugammadex (a specific antagonist) when compared with Neostigmine (a non-specific reversal).