Real-time B-mode carotid imaging. A three-year multicenter experience.

Area of Science:

• Vascular Surgery
• Diagnostic Imaging
• Cardiovascular Disease

Background:

• Carotid artery disease diagnosis relies on accurate noninvasive imaging.
• Real-time B-mode ultrasound has emerged as a key diagnostic modality.
• Evaluating its diagnostic performance and clinical utility is essential.

Purpose of the Study:

• To establish the role of real-time B-mode carotid imaging in diagnosing carotid artery disease.
• To analyze 3 years of clinical experience from three major noninvasive vascular laboratories.
• To assess the impact of experience on diagnostic accuracy and identify sources of error.

Main Methods:

• Studied over 7000 patients noninvasively using real-time B-mode carotid imaging and oculoplethysmography (OPG).
• Compared imaging results with angiographic findings in 1723 vessels.
• Classified stenosis severity into four grades (I-IV) and analyzed image quality, accuracy, and combined test results.

Main Results:

• Overall specificity was 87%; sensitivity for grades II, III, and IV disease was 72%, 66%, and 64%, respectively.
• Diagnostic accuracy for grade IV disease significantly improved with experience (p<0.0002).
• Interpretation errors and scan/arteriogram mismatches were primary sources of error; high-quality scans showed 97% specificity for grade I stenosis.

Conclusions:

• Real-time B-mode carotid imaging is a reliable technique for identifying normal carotid arteries and increasingly sensitive for detecting disease.
• Combining B-mode imaging with OPG demonstrated uniform predictive values (88%-93%) when results agreed.
• Despite limitations, real-time B-mode carotid imaging is a valuable clinical tool for carotid artery disease assessment.