Perfusion Index and End Diastolic Velocity Ratios as Predictors of Supraclavicular Block Success in Vascular Access Surgery

N/ANot Yet RecruitingNCT07197281

Assiut University50 enrolled

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.

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.

Study Type

OBSERVATIONAL

Enrollment

Conditions

End Diastolic Velocity Perfusion Index

Eligibility

Sex: ALLMin age: 18 YearsMax age: 65 Years

Medical Language ↔ Plain English

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

Outcomes

Primary Outcomes

Change in Perfusion Index ratio

Change in Perfusion Index ratio at 15 minutes after supraclavicular brachial plexus block in predicting successful block

Time frame: 15 minutes

Change in End Diastolic Velocity ratio

Change in End Diastolic Velocity ratio at 15 minutes after supraclavicular brachial plexus block in predicting successful block

Time frame: 15 minutes

Data from ClinicalTrials.gov

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