Role of Ultrasound in Analysis of Vocal Cord Movements in Comparison with Laryngoscopy
Analysis of Vocal Cord Movements
Background: Ultrasound is a real time, dynamic imaging modality, useful in evaluating the movement of anatomical structures. It is a non-invasive and cheap imaging technique which can be utilized as a primary tool/ as an alternate tool to laryngoscopy in assessing the vocal cord movements in suspected cases of Vocal cord palsy. Aims & objectives: To evaluate the utility of ultrasound in diagnosis of vocal cord movements in suspected cases of Vocal cord palsy. To compare the results with fibreoptic laryngoscopy findings. Subjects and Methods: A prospective comparative study done on 73 clinically suspected cases of vocal cord palsy. Vocal cord movements were assessed on ultrasound and results were compared with findings of flexible fibreoptic laryngoscopy. Results: Out of 73 cases of clinically suspected vocal cord palsy, 42 cases were diagnosed with reduced / absent movement of vocal cords on ultrasound. In 3 cases ultrasound was not able to diagnose vocal cords palsy due to excessive laryngeal cartilage calcification. Unilateral vocal cord palsy was noted in 36 patients and bilateral vocal cord palsy in 9 patients. Conclusion: Ultrasound is reliable, non-invasive and cheap modality to asses vocal cord movements. Compared to fibreoptic laryngoscopy it has high sensitivity and specificity in diagnosing vocal cord palsy.