Perfusion Index and End Diastolic Velocity Ratios as Predictors of Supraclavicular Block Success in Vascular Access Surgery
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: End Diastolic Velocity, Perfusion Index. Basic parameters: 18 years — 65 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Center list to be confirmed — check the primary protocol.
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Correlation Between Perfusion Index Ratio and End Diastolic Velocity Ratio After Supraclavicular Brachial Plexus Block as an Early Predictor of Successful Block in Superficialization Surgery of the Upper Limb
Overview
This is a prospective observational study investigating the correlation between Perfusion Index (PI) ratio and End Diastolic Velocity (EDV) ratio as early predictors of successful supraclavicular brachial plexus block (SCBPB) in patients undergoing superficialization surgery of the upper limb.
Detailed description
Regional anesthesia is fundamental for upper limb surgeries, with SCBPB providing dense anesthesia. However, early confirmation of successful block performance remains challenging. Traditional clinical methods (sensory/motor testing) are subjective and delayed. This study proposes using objective, noninvasive indices - PI (evaluated via pulse oximetry) and EDV (measured by Doppler ultrasound) - to determine their accuracy in detecting sympathetic blockade shortly after SCBPB. Early and reliable detection of block success is particularly important in superficialization surgeries such as arteriovenous fistula (AVF) superficialization in patients with compromised vascular status. The results are expected to enhance anesthesia practice by providing quantitative, reproducible, and rapid assessment tools.
Primary outcome measures
- Change in Perfusion Index ratio [Time frame: 15 minutes]
- Change in End Diastolic Velocity ratio [Time frame: 15 minutes]
Eligibility criteria
Inclusion criteria
- Adults aged 18-65 years
Both genders
ASA II-VI classification
Undergoing elective upper limb superficialization surgery (e.g., AVF superficialization)
Provided written informed consent
Exclusion criteria
- Patient refusal
Coagulopathy or bleeding disorders
Local infection at injection site
Allergy to local anesthetics
Use of vasopressors or beta-blockers
Severe peripheral vascular disease
Morbid obesity (BMI > 35)
Severe neurological or psychiatric disorders
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Center list to be confirmed — check the primary protocol.
Publications
- Abdelnasser A, Abdelhamid B, Elsonbaty A, Hasanin A, Rady A. Predicting successful supraclavicular brachial plexus block using pulse oximeter perfusion index. Br J Anaesth. 2017 Aug 1;119(2):276-280. doi: 10.1093/bja/aex166. PMID 28854539
Identifiers
NCT: NCT07197281 · PI and EDV as Predictors