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  • Title: The limitations of the digitalized pulse timing oculoplethysmography in the diagnosis of bilateral significant carotid stenosis.
    Author: AbuRahma AF, Boland J, Osborne L.
    Journal: Angiology; 1983 Sep; 34(9):604-9. PubMed ID: 6614587.
    Abstract:
    To critically analyze the accuracy of the Zira-OPG unit in the diagnosis of carotid stenosis, 161 patients (309 carotid arteries) out of 2500 patients tested were reviewed in comparison with angiogram. For practical purposes these patients were divided into several groups: 92 out of 101 normal arteries by OPG were confirmed by angiogram (91% true negative). Fifty-three out of 61 arteries with significant unilateral stenosis by OPG were confirmed by angiogram (87% true positive). Thirty-two out of 40 patients with significant stenosis on one side and mild on the other were picked by the OPG (80% true positive). Fifteen out of 27 patients with bilateral significant stenosis were confirmed by OPG (56%). Twelve out of 13 completely occluded arteries were confirmed by OPG. This unit is practical in detecting normal arteries, unilateral significant stenosis and bilateral disease if one side is mild but very limited in bilateral significant stenosis.
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