 The investigators now propose a study in rats, where the investigators will use Functional Respiratory Imaging FRI, property of FluidDA n.v., Groeningenlei 132, B-2550 Kontich to assess regional lung ventilation after sugammadex, neostigmine or spontaneous reversal. The images obtained through micro-CT scans allow us to accurately reconstruct airway morphology in the free-breathing rat. It will provide us with new insights into breathing physiology after reversal of neuromuscular blockade. 