An acceleromyographic train-of-four ratio of 1.0 reliably excludes respiratory muscle weakness after major abdominal surgery: a randomized double-blind study

Purpose This randomized double-blind study was designed to determine if respiratory muscle weakness – measured by maximum inspiratory pressure (MIP), maximum expiratory pressure (MEP), forced vital capacity (FVC), and forced expiratory volume in one second (FEV1) – persists even if an acceleromyographic train-of-four ratio (TOFR) of 1.0 is reached after major abdominal surgery.