Screening for High-grade Carotid Stenosis Using a Portable Ultrasonography Instrument
| Autor: | Li Ming Lien, Teng Yeow Tan, Ulf Schminke, M. Gene Bond, Charles H. Tegeler, James F. Toole, L. Motsch |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Male
medicine.medical_specialty Duplex ultrasonography Sensitivity and Specificity Power doppler symbols.namesake medicine Humans Carotid Stenosis Radiology Nuclear Medicine and imaging Prospective Studies Prospective cohort study Aged Ultrasonography Doppler Duplex Receiver operating characteristic business.industry medicine.disease Stenosis Area Under Curve Sonographer cardiovascular system symbols Female Neurology (clinical) Radiology Ultrasonography business Doppler effect |
| Zdroj: | Journal of Neuroimaging. 16:252-259 |
| ISSN: | 1552-6569 1051-2284 |
| DOI: | 10.1111/j.1552-6569.2006.00044.x |
| Popis: | We investigated the diagnostic performance of a brief Power Doppler Imaging (PDI) screening examination for carotid artery stenoses using a newly developed portable instrument.A highly experienced sonographer screened in total 152 carotid arteries by either continuous wave (cw) Doppler (n= 50) or a lightweight (2.4 kg) portable duplex device (n= 102) in a prospective study of 76 high-risk patients. The screening protocols included either spectrum analysis and frequency shift measurement in both internal carotid arteries with cw-Doppler or determination of area and diameter ratios in transverse and longitudinal views of both carotid arteries in B-mode and with PDI, but without velocity measurement. Both protocols were evaluated against a complete routine duplex ultrasonography examination.According to the complete examination, stenoses were50% in 73 of 102 (71.6%), 50-75% in 19 of 102 (18.6%), 75-95% in 7 of 102 (6.9%), and occluded in 3 of 102 (2.9%) arteries (PDI cohort), and50% in 39 of 50 (78%), 50-75% in 8 of 50 (16%), 75-95% in 2 of 50 (4%), and occluded in 1 of 50 (2%) artery (cw-Doppler cohort). Mean screening time was 8.8 +/- 2.5 minute (PDI) and 9.4 +/- 2.6 minute (cw-Doppler). For stenoses75%, A(z) values (area under the receiver operating characteristics curve) were 0.897 for area ratios, 0.843 for diameter ratios (PDI protocol) and 1.0 for the cw-Doppler protocol.The diagnostic performance of the cw-Doppler protocol was superior to the PDI protocol. Nevertheless, both protocols appear suitable as inexpensive screening strategies to identify subjects with75% stenosis measured by carotid Doppler ultrasound. However, these preliminary data need further verification. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text