The purpose of the study is the examine the precision of acceleromyography and mechanomyography during recovery from a neuromuscular blocking agent and to examine whether there is any difference in monitoring block at the dominant or non-dominant arm. Our hypothesis is that there is no significant difference in neither the precision nor the level of block in the contralateral arms.

Inclusion Criteria:

• ASA I-III
• General anesthesia >1 hour
• Surgery in supine position w. possibility of monitoring the neuromuscular block at both arms (n. ulnaris stimulation/thumb response)
• Written informed content

Exclusion Criteria:

• Neuromuscular disorders, hepatic and renal dysfunction
• Medication expected to interfere with the neuromuscular blocking agent
• Allergy to any medication used during anaesthesia
• Body weight less or exceeding 20% of ideal body weight
• Pregnancy or breastfeeding