Exploring the Potential of a Questionnaire in Predicting Results of Nerve Conduction Studies in Patients with Suspected Carpal Tunnel Syndrome: Exploring a Clinician and Patient Complete Version

Abstract

This evaluation of the Carpal Tunnel Questionnaire (CTQ) was designed to establish the validity and flexibility of its potential use both within a primary and secondary care setting. The questionnaire was originally designed to predict the positive and negative outcome of Nerve Conduction Studies (NCS) in those patients with suspected Carpal Tunnel Syndrome (CTS). Prior to being seen by the hand specialist patients who had been referred with suspected CTS where asked to complete the CTQ. These questionnaires were coded and filed by the clinic nurse. The hand specialist then completed the questionnaire with the patient preceding NCS. Questionnaires were scored subsequent to the appointment. Results for the hand specialist completed questionnaire showed an 80% specificity and 92% sensitivity regarding the ability of the CTQ to predict a positive NCS using a pre-determine cut-off score. The patient completed questionnaire showed a 70.67% specificity and 72% sensitivity. Using receiver operating characteristics a threshold score could be determined to achieve 100% sensitivity/specificity for both questionnaires. This questionnaire provides a useful addition in the assessment of patients with suspected carpal tunnel syndrome and could be used in a range of clinical settings although the scoring cut-off may need to be adapted depending on whether the questionnaire was completed by the clinician or patient. Using the questionnaire in a clinical setting would reduce the requirement for NCS by 60%, this would offer significant time and cost savings.