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Query: UMLS:C0007570 (celiac disease)
 13,091 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

To determine the comparative acccuracy of three noninvasive cerebrovascular testing systems, 72 patients underwent complete evaluation by Doppler cerebrovascular examination (DCE), oculoplethysmography (OPG-Kartchner), ocular pneumoplethysmography (OPG-Gee), and angiography. Considering 60% diameter stenosis or more by angiography as a true positive finding, the noninvasive tests of the 72 patients showed the following results: DCE, two false-positive, 17 false-negative, and 53 correct with an overall accuracy of 74%; OPG-Kartchner, six false-positive, four false-negative, and 62 correct with an overall accuracy of 86%; and OPG-Gee, no false-positive, two false-negative, and 70 correct with an overall accuracy of 97%. Independent of noninvasive test results, 57 symptomatic and three asymptomatic patients were selected for carotid endarterectomy. Of these 60 patients, 55 (92%) had positive preoperative OPG-Gee tracings. Noninvasive testing is a valuable carotid endarterectomy. Although considerable carotid ulceration may be undetected by noninvasive study, it was uncommon in this series.
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PMID:Doppler cerebrovascular examination, oculoplethysmography, and ocular pneumoplethysmography use in detection of carotid disease: a prospective clinical study. 70 56

To determine the accuracy of ocular pneumoplethysmography (OPG-Gee) in detecting carotid arterial occlusive disease, 350 patients were tested by OPG-Gee. Sixty-three patients underwent angiography and the findings were correlated with the results of OPG-Gee tracings. Testing without carotid compression averaged three minutes and was easily performed by a physician or technician. There were no significant complications. Hypertension did not affect evaluation. There were two false-negative tests and no false-positive tests. Without carotid compression the overall accuracy for testing for significant arterial stenosis was 97%. When a carotid compression test was added, the two missed lesions were detected.
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PMID:Ocular pneumoplethysmography: detection of carotid occlusive disease. 75 63

The diagnosis of internal carotid artery (ICA) occlusion has serious management and prognostic consequences. The accuracy of noninvasive techniques in this setting remains questionable, with the result that contrast arteriography remains the diagnostic method of choice in patients in whom ICA occlusion is suspected. Ocular pneumoplethysmography-Gee (OPG-Gee) is one of the noninvasive methods that is still utilized extensively in the evaluation of carotid artery disease. In order to determine the real utility of OPG-Gee, the authors conducted a retrospective comparison of the results of OPG-Gee and arteriography in 26 patients (52 internal carotid arteries) who had undergone both examinations. [table: see text] With the angiography results as the standard of comparison, 4 incorrect diagnoses were obtained by OPG-Gee, thus yielding an overall accuracy of 92 for this method. However, duplex ultrasonography, also performed in the same 26 patients, correctly identified the 2 ICA occlusions defined by angiography and further demonstrated patency in the 48 arteries so shown by angiography. The authors conclude from this experience that OPG-Gee is less reliable than duplex ultrasonography in the diagnosis of ICA occlusion. Furthermore, despite the 92% overall accuracy of their results with OPG-Gee, the occurrence of both false-positive and false-negative results renders this examination modality suspect in the diagnosis of ICA occlusion.
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PMID:Internal carotid artery occlusion: diagnostic inaccuracy of the ocular pneumoplethysmography. 176 29

In 516 patients who had endarterectomies for unilateral severe carotid stenoses, arteriography demonstrated no contralateral severe stenoses or occlusions. Pre and postoperative ocular pneumoplethysmography (OPG-Gee) measured simultaneous bilateral ophthalmic systolic pressures (OSP). Immediately after each OPG test a brachial systolic pressure (BSP) was measured with a stethoscope, cuff and manometer. Bilateral ophthalmobrachial systolic pressure (OBSP) indices were calculated from the three pressures measured with the combined testing. Analysis of these OBSP data indicates that the severe stenoses were relatively well compensated in 314 of the 516 patients (61%) whereas there was limited collateral compensation in the remaining 202 patients (39%). The data also suggest that the latter group incurs a greater element of compensatory central hypertension, which is reversed by carotid endarterectomy.
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PMID:Collateral compensation of severe carotid stenosis. 276 52

We reviewed the records of patients undergoing carotid endarterectomy and manifesting either postoperative stroke or thrombosis by oculopneumoplethysmography (OPG-Gee) to analyze the etiology of stroke and to determine the indications for reexploration. Of 900 consecutive elective endarterectomies performed during an 8-year period, 41 patients experienced a perioperative stroke, carotid thrombosis, or both. These patients were subdivided into three groups: group 1, 22 patients with perioperative stroke and carotid thrombosis; group 2, six patients with carotid thrombosis but without symptoms; and group 3, 13 patients with postoperative stroke but no thrombosis. In group 1, 17 patients were reexplored (group 1a), and five were observed without reexploration (group 1b). In group 2, three of the patients were reexplored (group 2a), and the remaining three were observed (group 2b). None of the group 3 patients were reexplored. In group 1a, four (23%) patients awoke from anesthesia with neurological deficits, whereas in group 3, nine (69%) patients awoke with such deficits. Follow-up at 30 days revealed that 76% of group 1a patients demonstrated improvement in symptoms, whereas similar results were seen in only 20% of group 1b patients and 23% of group 3 patients. These trends were maintained throughout the follow-up period of 1-5 years. Those patients who were asymptomatic, group 2, with thrombosis were more likely to have been operated on for asymptomatic carotid stenosis. with thrombosis were more likely to have been operated on for asymptomatic carotid stenosis. Thrombosis was the most common cause of postoperative stroke (63%) in patients after carotid endarterectomy.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Reexploration for thrombosis in carotid endarterectomy. 280 7

The results of the combination of CW-Doppler ultrasonography and OPG-Gee are described in 68 patients. The Doppler examination had a sensitivity of 92% and a specificity of 89%, the percentages for the OPG-Gee were 69 en 79. The combination of the Doppler examination with the OPG-Gee improves our positive predictive value from 83 to 94%, the negative predictive value from 95 to 98% in concordant results. OPG-Gee fails especially in low-graded (50-74%) stenoses. Since there is no correlation between the degree of the stenosis and the pathophysiological changes of the cerebral circulation, OPG-Gee is of complementary value for the evaluation of the hemodynamic significance of a stenosis, established with the Doppler method.
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PMID:The complementary value of Doppler-ultrasonography and ocular pneumoplethysmography according to Gee (OPG-Gee) in carotid obstructions. 305 70

For an adequate assessment of both the ophthalmological and the neurological consequences of carotid obstruction measurement of the blood pressure in the carotid flow area is essential. To this end there are two objective, registrating methods available at the moment: OPG-Gee and OODG-Ulrich. A comparative study was made into the basic principles, calibration curves and application methods of these systems. By both methods the systolic retinal--and ciliary--as well as the diastolic ocular blood pressure can be measured. OODG is more exact for the differentiation and measurement of the two systolic blood pressures. OPG-Gee, however, offers the unique additional possibility of a judgement on the systolic blood pressure in the carotid siphon without, however, taking into account a (difference in) pre-existing intraocular pressure. Our own investigation shows that in order to obtain a correct assessment of the carotico-brachial relation both blood pressures should be measured simultaneously. The results of the graphic analysis of the curves are compared to those by Ulrich. For the diagnosis of carotid obstructions this analysis of the shape had no advantages over the determination of the pressure values. Finally, a survey is given of possible applications of OPG and OODG in various other syndromes.
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PMID:OODG-Ulrich and OPG-Gee: a comparative study. 316 11

A series of letters in this journal discussed the safety of ocular pneumoplethysmography (OPG-Gee) in pseudophakic patients. In the interval since these letters, experience with OPG-Gee tests performed on 115 pseudophakic eyes demonstrated no ocular morbidity associated with these procedures.
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PMID:Ocular pneumoplethysmography after lens implantation. 340 27

The cerebral perfusion pressure, as measured by ocular pneumoplethysmography (OPG-Gee), was used to evaluate the hemodynamic significance of carotid coiling in 25 patients, eight of whom had bilateral coiling. Positional studies were done with the head in the normal position and turned to the right and left. Seven of the 33 coilings (21%) were hemodynamically significant with the head in the normal position. A change in perfusion pressure when the head was turned was seen in 16 of 50 rotation studies (32%). There was a reduction in pressure in 11 instances and increase in five. In a control group of 24 subjects with normal angiograms, 18 of 48 studies (37%) showed a change in perfusion pressure with the head turned. Carotid coiling can be hemodynamically significant. Rotation of the head can compromise the carotid circulation whether coiling is present or not. OPG proved to be a simple means of evaluating the hemodynamic significance of carotid coiling and the effects of head rotation on the carotid circulation.
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PMID:The hemodynamic significance of carotid coiling. 341 44

A prospective trial was set up in 100 patients, who underwent arteriography of the cerebropetal and cerebral arteries, to determine the value of the direct examination of the Carotid arteries using a continuous wave bidirectionnal Doppler with spectrum frequency analysis. The results of this non-invasive direct technique are compared with the biplane arteriography and with the indirect noninvasive oculoplethysmography (OPG-Gee). The conclusions of this study are that the direct Doppler examination with spectrum frequency-analysis is a very good tool in detecting lesions in the Carotid arteries, and is superior to the indirect OPG-Gee examination, especially in stenoses of 30-69%.
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PMID:[Determination of the value of spectrum analysis of the Doppler signal in the assessment of the carotid artery bifurcation]. 351 15


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