The staircase phenomenon could have repercussions on the onset and recovery time following administration of a neuromuscular blocking agent. The investigators aim to assess the magnitude of the staircase phenomenon and its impact on various aspects of neuromuscular blockade with a randomized controlled double blind trial.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
50
Administering a Tetanic stimulus before baseline stabilization shortens the stabilization period of baseline of a neuromuscular block monitor. This acts on the baseline value
Hospital Universitario La Fe
Valencia, Spain
Difference in Block Onset time difference (seconds)
Onset time is the time between Train of Four (TOF) at the moment of injection of neuromuscular blocking drug and the minimum value reached (onset of neuromuscular block)
Time frame: rom 0 seconds up to 240 seconds after neuromuscular block administration at the beginning of surgery. Time frame is the duration of general anesthesia before, during and after surgery (up to 4 hours).
Difference in time until recovery of a TOF ratio (TOFr) of 0.9
Time until recovery of a TOF ratio of 0.9 (reversal of neuromuscular block as assessed by the monitor). During recovery phase stimuli regain height until all four stimuli of the Train-of-Four are present. Train-of-Four ratio is the ratio between the fourth and the first stimuli (T4/T1).
Time frame: From administration of neuromuscular blocking drug until spontaneous reversal (up to 4 hours). Time frame is the duration of general anesthesia before, during and after surgery (up to 4 hours).
Difference in TOFr 0.9 Normalized
Time until recovery of a TOF ratio of 0.9 normalized to baseline TOR ratio after calibration. (e.g. if baseline TOF ratio is 1.1, normalized TOF ratio 0.9 is: 1.1 x 0.9 = 0.99)
Time frame: From administration of neuromuscular blocking drug until spontaneous reversal at this specified point (up to 4 hours). Time frame is the duration of general anesthesia before, during and after surgery (up to 4 hours).
Difference in time until recovery of 25% of maximum twitch height ot T1 stimulus (DUR25)
Difference in time until recovery of 25% of maximum twitch height ot T1 stimulus during recovery phase. During recovery phase stimuli begin to recover and their height increases. This outcome is the time between the beginning of neuromuscular block until recovery of 25% of height of the first stimulus of the Train-of-Four.recovery phase. During recovery phase stimuli begin to recover and their height increases. This outcome is the time between the beginning of neuromuscular block until recovery of 25% of height of the first stimulus of the Train-of-Four (TOF)
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Time frame: From administration of neuromuscular blocking drug until spontaneous reversal at this specified point (up to 4 hours). Time frame is the duration of general anesthesia before, during and after surgery.(up to 4 hours)
Time between 25% and 75% of maximum twitch height recovery of T1 stimulus
Time between 25% and 75% height recovery of maximum twitch height in the recovery phase.
Time frame: From administration of neuromuscular blocking drug until spontaneous reversal (up to 4 hours). Time frame is the duration of general anesthesia before, during and after surgery (up to 4 hours).
Difference between first stimulus of Train-of-Four ratio at baseline
Difference between T1 at baseline. Train-of-Four ratio is the administration of four consecutive stimuli to the monitored muscle. These stimuli are named T1,T2,T3,T4. This is the difference between tow arms oh T1 height at baseline
Time frame: Single measurement of muscle response after calibration procedure at the beginning of data recording after randomization. It is not a time-to-event variable
Difference between T1 height after stabilization period of 20 minutes
Difference between T1 height after stabilization period of 20 minutes
Time frame: Single measurement after 20 minutes stabilization period after beginning of neuromuscular stimulation. It is not a time-to-event variable
Difference between TOF ratio at baseline time
Difference between TOF ratio at baseline time
Time frame: Single measurement of muscle response after calibration procedure at the beginning of data recording.
Difference between TOF ratio after stabilization period time
Difference between TOF ratio after stabilization period time
Time frame: Single measurement after 20 minutes stabilization period after beginning of neuromuscular stimulation.
Monitor Sensitivity difference between groups
Sensitivity parameter is set by monitor after calibration.
Time frame: Single value no time frame. Sensitivity is internally set by the monitor during calibration (at the beginning of data recording after randomization)
Monitor Amperage Intensity after calibration difference (milliAmperes, mA)
Monitor Amperage Intensity is set by the monitor after calibration
Time frame: Single value no time frame. Sensitivity is internally set by the monitor during calibration (at the beginning of data recording after randomization)
T1/TOFratio relationship difference
During recovery phase T1 over TOF ratio will be calculated and the difference between two groups will be assessed.
Time frame: Ratio of specified values recorded by the monitor at the beginning of surgery until onset of neuromuscular block (up to 180 seconds) and during spontaneous recovery up to 4 hours until end of anesthesia