Development and Validation of an Android-based Application for Anaesthesia Neuromuscular Monitoring

Inclusion Criteria: * American Society of Anaesthesiology (ASA) physical status classification I to III * elective procedures under general anesthesia requiring use of a non-depolarizing neuromuscular blocking agent Exclusion Criteria: * Known or suspected central or peripheral neuropathies of any ethology * Muscular dystrophies * Skin burns and trauma at measurement sites (arms). * Musculo-tendinopathies of the arms and hands. * All conditions that might be judged to alter appropriate peripheral neuromuscular conduction. * Fragile skin impeding placement of electrocardiogram electrodes at measurement sites. * Allergy to ECG Electrodes * Intra-operative position impeding proper use of any of the two used neuromuscular monitors. * Calibration/device failure * Failure to properly stabilize the patient's hand in supination (so that the smartphone won't dislocate itself during measurements) * Patient premedication judged to interfere with proper cognitive assimilation of the study concept.