A Study of Sensitivity and Specificity of Color Duplex Ultrasound for the Evaluation of Carotid Artery Stenosis
Journal Title: Scholars Journal of Applied Medical Sciences - Year 2018, Vol 6, Issue 7
Abstract
Diagnosis of the carotid artery stenosis is an important tool for reducing the incidence of strokes in patients with comorbidities. Colour du¬plex ultrasonography is widely used for diagnosing Internal Carotid Artery (ICA) stenosis. Management decision of carotid stenosis is many times based on this technique alone. Therefore we in the present study tried to evaluate the sensitivity, specificity, and accuracy of color duplex ultrasonography compared with a standard for the diagnosis of ICA. Methods: The present study was carried out in the Department of Radiology, Prathima Institute of Medical Sciences, Naganoor, Karimnagar. Routine patients who were referred to the radiology department with comorbidities for evaluation of ICA were included in the study. Results: A total number of 94 patients were included in the study Internal Carotid Artery velocities were recorded and a comparative study was done. Peak Systolic Velocities [PSV] and End Diastolic Velocities [EDV] and percentage of stenosis were calculated. Stenosis based on arteriographic modalities ranged from 0 – 99% (complete occlusion was excluded). The mean stenosis was 74.6% (SD 22.5%). The PSV ranged from 48 – 410 cms/sec and the mean value was 298 cms/sec. The EDV was from 0 to 250 cm/sec (130.2 cm/sec) with a mean value of 82.5 cm/sec. The sensitivity, specificity, and accuracy were then calculated for > 50% stenosis the overall sensitivity was 96.15%, accuracy was 94.95% the specificity was 90.48%, the PPV was 97.40% and NPV was calculated to be 86.36%. The sensitivity, specificity, and accuracy were then calculated for > 70% stenosis the overall sensitivity was 96.43%, accuracy was 93.75% the specificity was 90.00%, the PPV was 93.10% and NPV was calculated to be 94.74%. Conclusion: Within the limitations of the present study it has been concluded that Doppler ultrasonography has acceptable accuracy, sensitivity, and specificity for evaluating the Internal Carotid Artery Stenosis. However, it must be validated from time to time with standards like DSA and CTA.
Authors and Affiliations
Dr. Kunkunuru Sudheer
Keywords
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