Deep neuromuscular block (NMB) has shown to produce superior surgical conditions during various abdominal and non abdominal surgeries. It is however unknown if the application of deep NMB leads to favourable outcome, such as lower rate of postoperative complications in general and surgical infections in specific and ultimately lower readmission rates. In the leiden university medical center, deep NMB is routinely applied for a variety of procedures, most notably laparoscopic abdominal and retroperitoneal surgery, eye surgery and neuro radiologic intervention surgery, since 2014. This retrospective study intends to investigate whether the application of deep NMB for these procedures affects patient outcome and readmission rates.