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Results for “Ophthalmodynamometry”

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At least 37 records · Page 2Linked to original sources
PubMed1979

Suction ophthalmodynamometry in the diagnosis of carotid stenosis.

In a prospective evaluation of 39 patients who had arteriography for suspected carotid stenosis, suction ophthalmodynamometry correctly identified 86% of the patients who had radiographically demonstrable unilateral or asymmetric obstructions. This compares favorably with carotid compression tonography, oculoplethysmography, and Doppler flow studies. The false-positive rate was 27%, a figure higher than the latter two noninvasive tests.

Carotid Arteries↗
PubMed1979

Obstruction of the central retinal artery. Comparison of the ophthalmodynamometry measurements in relation to the time.

The clinical picture of occlusion of the central retinal artery was studied in 37 cases. The fundus findings were described in the most interesting cases. The cerebrovascular resistance and cerebral blood flow were calculated on the nonaffected side. The ophthalmic artery blood pressure was found to be elevated in 5 cases due to obstruction of the internal carotid artery distal to the origin of the ophthalmic artery. The ophthalmic blood pressure was decreased in the rest of the cases within the first 3 days after the onset of the clinical manifestations of the disease. After 3 weeks, a recanalization of the central retinal artery had occurred in most cases. Almost all cases show no side difference after 2 months. A minimal side difference was found in a very few cases only. In 54% of the patients, ophthalmodynamometry of the nonaffected side revealed, an elevation of the cerebrovascular resistance. The cerebral blood flow is compensated in 67% due to the elevation of the internal carotid blood pressure. The findings indicate that patients with elevated vascular resistance are susceptible to obstruction of the central retinal artery.

Adult↗
PubMedDate not supplied

Ophthalmodynamometry in internal carotid artery occlusion.

Retinal artery pressure was measured by ophthalmodynamometry in 15 patients with occlusion of the internal carotid artery in its extracranial part. Nine of the patients had severe neurological deficit whereas the remaining six had slight or intermittent symptoms. Retinal artery pressure was reduced on the side of the internal carotid artery occlusion in all patients studied. Near-zero low diastolic retinal artery pressure on the affected side was a common finding among patients with severe deficit and was also seen in some patients with slight deficit. Its presence strongly suggests occlusion of the ipsilateral internal carotid artery.

Adult↗
PubMed1981

Ophthalmodynamometry: comparative study of obstruction of the central retinal artery and thrombosis of the internal carotid artery.

A comparative study of obstruction of the central retinal artery and thrombosis of the internal carotid artery was done. The ophthalmodynamometry method (ODM) was used. The statistical analysis of the 2 independent groups shows that ODM allows a differential diagnosis between both conditions within the first and fourth weeks after the manifestation of ocular ischemia. During the second and third weeks, it is not possible to localize the site of obstruction. One concludes that the time factor is an important criterion for the differential diagnosis between obstruction of the central retinal artery and the internal carotid artery when ODM is used.

Adult↗
PubMed1983

Functional ophthalmodynamometry. Comparison between brachial and ophthalmic blood pressure in sitting and supine position.

Ophthalmodynamometry was done by 96 normotensive volunteers and 62 hypertensive patients in sitting and supine position. A high correlation between the brachial and ophthalmic blood pressure was found in both groups, and in both positions. The brachial blood pressure of normotensive subjects did not show any difference in both positions. Although the systolic brachial blood pressure did not show significant changes in hypertension, the diastolic--and the calculated mean brachial blood pressure has been slightly but significantly decreased in the supine position. In both groups, normotension and hypertension, the ophthalmic blood pressure was found to be dependent from the level of the systemic blood pressure and the position of patient. It is significantly higher in the supine position than in the sitting position. The higher the systemic blood pressure in the sitting position, the less was the increase of the ophthalmic blood pressure in the supine position.

Blood Pressure↗
PubMed1999

Intracranial pressure in microgravity conditions: non-invasive assessment by ophthalmodynamometry.

BACKGROUND: As well known from former manned spaceflight experiments (German D2-Mission/German D1-Mission 1985/German-Russian MIR-Mission 1 992/German-D2-Mission 1993), fluid shift after entry into microgravity leads to a rapid increase in pressure and volume within the upper compartments of the human body. This has been proven by precise measurements with automatic selftonometers for intraocular pressure. HYPOTHESIS: There is little doubt, that a very similar--even more, marked--increase of intracranial pressure happens soon after entry into microgravity. This may be the cause for some of the reported hormonal and even neurological changes in metabolism. There is no non-invasive method to assess these important increases in pressure. METHODS: Ophthalmodynamometry in general allows for rather precise estimation of intracranial BP, but so far the method was too complicated for routine application, specifically in spaceflight conditions. Therefore, using the microprocessor controlled technology of our automatic selftonometer we have designed a very precise automatic instrument which can be applied by the astronaut/kosmonaut. The measurement takes only a few seconds. CONCLUSIONS: This easily applied, non-invasive method would allow for completely new insights into these important changes and explain some of the clinical consequences noted so far.

Astronauts↗
PubMed1977

[Value of ophthalmodynamography and ophthalmodynamometry in acute cerebrovascular processes].

Methods of examination are briefly described and findings are then reported for cerebral vascular processes. The results have been assessed in comparison with the angiographic picture. The authors conclude that both ophthalmodynamography and ophthalmodynamometry can be used to record haemodynamic changes resulting from stenosing vascular processes in the extra-cranial cerebral vascular area. The two methods are non-operative and involve little stress on the patient during examination so that they may be used for preliminary diagnostic purposes.

Acute Disease↗
PubMed1989

[Occlusion site and occlusion time of central artery occlusions: diagnostic references caused by changes in the collapse phenomenon of the central artery in ophthalmodynamometry].

The collapse of the central retinal artery in ophthalmodynamometry is typically altered in cases of central retinal artery occlusion. The alterations of the collapse phenomenon can be used to obtain the following information: (1) location of the occlusion; (2) duration of the occlusion. This information is of great value in determining the pathogenesis and therapy of central retinal artery occlusion.

Adult↗
PubMed1979

Ophthalmodynamometry: a reappraisal.

The accuracy of ophthalmodynamometry (ODM) was retrospectively analyzed in 36 patients who had ophthalmic examinations prior to carotid arteriography. In 75% of those patients, ODM correctly predicted the presence of absence of significant stenosis (ie, 50% or greater) or occlusion of the internal carotid artery. A 30% false-negative rate and 19% false-positive rate was found in this study. The accuracy was not improved when the examiner had more experience with the test. The accuracy of ODM with staff members who regularly perform the examination was 68% as compared to the ophthalmology residents' accuracy of 76%. Causes of false-negative and positive results include subjectivity of the examination, stenosis of arteries other than the internal carotids, and development of collateral circulation as was demonstrated arteriographically in 2 of our patients.

Aged↗
PubMed1984

A simple technique for Doppler ophthalmodynamometry.

A novel method to assess carotid and intraocular blood flow and pulse pressures is presented. This procedure can be performed by personnel not trained in ophthalmoscopy, and is valid in eyes with opaque media. It is noninvasive, requires no elaborate equipment, and may be useful as an adjunct to ophthalmodynamometry.

Blood Pressure↗
PubMed1983

Ophthalmodynamometry reveals retinal embolus.

Suction ophthalmodynamometry made an otherwise invisible retinal embolus appear by attenuating the overlying blood column. Observation of the entire posterior pole while the intraocular pressure is at diastole could enhance our ability to detect retinal emboli.

Aged↗
PubMedDate not supplied

[Ophthalmodynamometry in transitory cerebral ischemic episodes].

The authors examine the diagnostic accuracy of ophthalmodynamometry in detecting extracranial internal carotid artery stenosis. 58 patients with T.I.A.s or R.I.N.D.s are studied. The test, compared with angiography, is positive only in 50% of patients presenting unilateral internal carotid artery occlusion.

Carotid Artery Thrombosis↗
PubMed1980

[Limits and possibilities of ophthalmodynamometry and ophthalmodynamography in the diagnosis of carotid occlusion (author's transl)].

In 67 patients suspected to suffer from cerebral vascular disorders or arterial occlusive disease results of ophthalmodynamometry and ophthalmodynamography were compared with those of carotid angiography. Especially in patients with angiographically substantiated carotid stenosis the results of ODM and ODG were extraordinarily poor. The findings of ODM and ODG proved to be non indicative in 29 out of 35 cases. The authors discuss the possible reasons of these disappointing results.

Brain Ischemia↗