Table 4. Comparison of OPG-K with carotid angiograms in patients with cerebrovascular symptoms or asymptomatic bruits (percent)

ReferenceNo. of vesselsOverall sensitivity ratea Sensitivity rate in unilateral diseasea Sensitivity rate in bilateral diseasea Specificity rateb Positive predictive valuec Negative Predictive valued Prevalencee CPA
Wasserman(30)13270NRNR83757942Yes
Keagy(31)29140NRNR96728620Yes
Keagy(31)23455NR2393627441Yes
Kartchner(28)93688NRNR92909045No
Kirkpatrick(32)12393NRNR65788758Yes
Kapsch(33)10891866346648352Yes
Ghosh(34)10092NRNR96889725Yes
Blackshear(35)10652NR1381696745NR
House(36)21548NR5094718623No
Dietzen(37)5368NRNR51388030Yes
AbuRahma(38)40093NRNR91948765Yes
Total2,698

a True positives/true positives plus false negatives on the index test. Truth is determined by the reference method.

b True negatives/true negatives plus false positive.

c True positives/true positives plus false positives.

d True negative/true negatives plus false negatives.

e The proportion of people who have the attribute of interest: true positives and false negatives/sample population.

Abbreviations: CPA = carotid phonoangiography; NR = not reported; OPG-K = Kartchner's oculoplethysmography method.

From: Plethysmography: Safety, Effectiveness, and Clinical Utility in Diagnosing Vascular Disease

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