About this trial
The purpose of this research is to determine whether a simple technique, temporarily raising the arm during the injection of propofol (a commonly used medication for anesthesia), can reduce the pain that some people experience when the medication is given through an IV. The study will compare this technique with the current standard approach of using lidocaine (a numbing medication), as well as a combination of both methods, to determine which approach is most effective at reducing injection pain.
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
ASA I-III
18G or 20G dorsal hand working IV in place (drip by gravity)
Planned IV propofol infusion with natural airway
Able to provide consent
Disqualifiers
Allergy to propofol/lidocaine
Significant cognitive impairment/acute psychosis
Any sedative medications given prior to the study
Pregnancy
Trial design
Parallel
Treatments tested in this trial
Passive arm elevation
Procedure/SurgeryThe cannulated arm is passively elevated approximately 60 to 90 degrees at the start of propofol injection and maintained briefly during and immediately after the injection before being returned to heart level.
Normal saline
DrugNormal saline 0.9%, 2 mL, administered intravenously as sham lidocaine before propofol injection.
Lidocaine
DrugLidocaine 2%, 2 mL, administered intravenously before propofol injection.
Propofol
DrugStandard LCT propofol administered as a standardized subanesthetic test dose, calculated as one-quarter of a 2.5 mg/kg induction dose using total body weight up to BMI 30 or ideal body weight above BMI 30, with a maximum study dose of 50 mg.
Sham arm elevation
Procedure/SurgeryThe contralateral non-IV arm is elevated while the cannulated arm remains neutral.
Treatment groups
Trial outcomes
Primary outcomes
Incidence of Any Propofol Injection Pain
Proportion of participants reporting any propofol injection pain during or immediately after the standardized propofol test dose, defined as a verbal rating scale score of 1 or greater on a 4-point verbal rating scale where 0 indicates no pain, 1 mild pain, 2 moderate pain, and 3 severe pain.
Secondary outcomes
Pain Severity Score
Pain severity measured as the participant's highest pain score during or immediately after the standardized propofol test dose using a 4-point verbal rating scale, where 0 indicates no pain, 1 mild pain, 2 moderate pain, and 3 severe pain.
Incidence of Moderate-to-Severe Propofol Injection Pain
Proportion of participants with moderate-to-severe propofol injection pain, defined as a verbal rating scale score of 2 or 3 on the 4-point verbal rating scale.
Sponsors and contacts
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