Efficacy And Tolerability Of Alpha Lipoic Acid And Vitamin B Preparation In Carpal Tunnel Syndrome

The patients were randomized to receive oral combination of alpha lipoic acid and vitamin B (alpha lipoic acid; 300mg, methylcobalamin; 500mcg, vitamin B1; 39mg and vitamin B6; 8mg), 2 tablets once daily or placebo drug (maltodextrin, microcrystalline cellulose, tricalcium phosphate, silicon gioxide, magnesium stearate) 2 tablets once daily. Randomization sequence was done by using an online random number generator program using a mixed block randomization technique at a ratio of 1:1. In cases of serious adverse event, unblinding process was incorporated where the identity of the drug was revealed to manage the subject's condition. This was done by intruding the emergency code key by the researcher. All patients provided a written consent for the study.

During visit 1, a thorough history and physical examination were done, and demographic data was collected. Afterward, the patients were required to answer three sets of self-administered questionnaires: Boston Carpal Tunnel Questionnaire (BCTQ), Visual analogue score (VAS) and SF-36. The BCTQ is a specific questionnaire for assessing CTS that consists of two distinct scales, the Symptom Specific Scale (SSS) which has 11 items and the Functional Status Scale (FSS) containing 8 items. Each scale generates a final score ranging from 1 to 5, with a higher score indicating greater disability and poor symptoms control. BCTQ is a reliable questionnaire to assess CTS owing to its high cross-cultural adaptation and multilingual validity and reliability. The VAS is a visual scale with 0 scored as "no pain" and 10 as "worst pain imaginable" and serves as an excellent tool for pain score with excellent validity and reproducibility. The SF-36 is a quality-of-life questionnaire that comprises of 36 questions covering eight domains of health which are; Physical Functioning (PF), Role Limitations due to Physical Health, Role Limitations (RL) due to Emotional Problems (RE), energy/fatigue, emotional well-being, social functioning, pain, and general health (GH) where a higher score indicates a better outcome . After the administration of these questionnaires, they will be subjected for a nerve conduction study (NCS) to determine the severity of CTS. The NCS were performed by the same trained personnel to ensure consistency and accuracy.

The patients were reassessed at Visit 2 (3 months post-treatment) and Visit 3 (6 months post-treatment). During each visit, they underwent physical examination, NCS, and were required to complete the three sets of questionnaires (BCTQ, VAS, and SF-36). They were also required to fill in the form regarding the side effects of the treatments. The investigators made a phone call and sent reminder message at the 6th and 18th week to ensure compliance, medication adequacy and follow up review. During the study, patients were allowed to undergo the standard of care treatment at our center such as physiotherapy.

Inclusion criteria

• all patients with numbness and tingling sensation at the first finger until the radial site of the 4th finger
• and/or fulfil the electrodiagnostic criteria of mild to moderate CTS, based on the Padua Scale as defined below:

• Mild: abnormal digit/wrist Sensory Nerve Conduction Velocity (CV) and normal Distal Motor Latency (DML)
• Moderate: abnormal digit/wrist Sensory Nerve Conduction Velocity (SNCV) and abnormal Distal Motor Latency (DML).

Exclusion criteria

• pregnant or breastfeeding women
• patients with symptoms of CTS but have normal NCS
• patients taking traditional or complementary medication for CTS
• patients with electrodiagnostic criteria of severe or extreme CTS as defined in the Padua scale:

• Severe: Absence of sensory response (SNAP) and abnormal Distal Motor Latency (DML).
• Extreme: Absence of motor (CMAP) and sensory responses (SNAP).