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Detection of carotid artery stenosis and obstruction by cerebral radionuclide angiography
Insights
Doppler ultrasound (DU) and rekanal angiography (RA) effectively detect carotid artery disease. Combining RA and DU significantly improves non-invasive detection rates for stenosis and obstruction in patients with transient ischemic attacks or reversible ischemic neurological deficits.
Area of Science:
- Neurology
- Vascular Medicine
- Radiology
Background:
- Transient ischemic attacks (TIAs) and reversible ischemic neurological deficits (RINDs) are critical indicators of cerebrovascular disease.
- Accurate non-invasive assessment of carotid artery stenosis and obstruction is crucial for risk stratification and management.
Purpose of the Study:
- To evaluate the diagnostic performance of rekanal angiography (RA) and Doppler ultrasound (DU) in detecting carotid artery lesions in patients with TIAs or RINDs.
- To determine the added value of combining RA and DU for non-invasive assessment of carotid artery disease.
Main Methods:
- Retrospective analysis of 140 patients with TIAs or RINDs, excluding completed strokes.
- RA and DU were performed, with RA abnormality criteria established using a control group (n=100).
- Detection rates and false positive/negative results for extracranial and intracranial lesions were analyzed.
Main Results:
- The overall detection rate for extracranial carotid artery lesions was 63% with RA alone.
- DU detected lesions in 76% of patients.
- The combined use of RA and DU enhanced the detection rate to 88%.
- RA demonstrated intracranial perfusion asymmetry in 65% of cases, outperforming CA (26%).
Conclusions:
- RA is highly effective for documenting intracranial carotid artery territory disease and its consequences.
- DU is preferred for detecting extracranial carotid artery lesions.
- The combination of RA and DU significantly enhances the non-invasive detection of carotid artery stenosis and obstruction.
Abstract:
CA and RA were performed in 140 patients suffering either from TIAs (n = 43; mean age 59 +/- 9.7 years) or from RIND (n = 97; mean age 58 +/- 13 years). Completed stroke was excluded from this study. Criteria of abnormality of RA were determined from a normal control group (n = 100; mean age 37 +/- 17 years). Overall detection rate of extracranial carotid artery lesions of any size was 63% (42:66). False negative results were reviewed. Within the same group of patients, DU was positive in 76%. The addition of RA and DU enhanced the detection rate to 88%. In the subgroup with normal extracranial carotid arteries, RA accounted for 6.7% of false positive results. Intracranially, RA was able to demonstrate a significant asymmetry of perfusion in good correlation with clinical examination in 65% of the cases (91: 140), whereas CA was found positive in only 26% of the patients. It is concluded that RA is best suited for documentation of intracranial carotid artery territory disease and for studying intracranial consequences of extracranial lesions. In contrast, DU is preferred for detection of extracranial lesions. However, the addition of both techniques enhances the power of non-invasive detection of carotid artery stenosis and obstruction.