Postoperative Pain
Conditions
Brief summary
This study aim to calculate the minimal effective ropivacaine concentration required achieve successful analgesic interscalene block in 90% of patients (MEAC90)
Detailed description
* Before induction of general anesthesia, all patients will receive interscalene block using 15ml of ropivacaine which concentration will be based on the response of the previous patient. * Based on biased-coin design up-down sequential method: if patient has pain free recovery, a successful block, the next patient will be randomized to receive either the same ropivacaine concentration or a concentration 0.01% w/v less. However, if he has an unsuccessful block, the next patient will receive a concentration 0.01% w/v higher. * Patients with pain free recovery will be considered to have positive response. * Patients' responses will be analyzed to calculate the MEAC90.
Interventions
DRUGRopivacaine
all patients will receive interscalene block using same volume of ropivacaine but in different concentrations
Sponsors
Healthpoint Hospital
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Patients, who are scheduled for shoulder arthroscopy
Exclusion criteria
* \- \<18 y, * ASA physical class greater \>III * BMI \>40 has any contraindication for medications or techniques used in the study
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| effective analgesic interscalene block | in recovery unit (one hour after surgery) | postoperative pain (will be assessed using numerical rating scale. if ≥ 3, ineffective block will be considered and if \<3, an effective block will be considered |
Countries
United Arab Emirates
Outcome results
None listed