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At least 217 records · Page 12Linked to original sources
PubMed1997

[Ophthalmodynamometry. Current aspects].

In the paper we have pointed out the importance of ocular pressure in diagnosis of vascular-cerebral diseases. We have insisted upon the difficulties of interpreting the values of ocular pressure. The correlations between the maximum, medium and minimum values of ocular pressure are presented. We have also carried out a systematization of the four possibilities of altering the arteries resistance in the carotid system and pointed out the pathological situations which can determine changes of the ocular pressure. Presenting the method limitations we have emphasized the importance of the method in clinical practice.

Cerebrovascular Disorders↗
PubMed1980

An evaluation of currently available, noninvasive tests of carotid artery disease.

A clinical study compared compression ophthalmodynamometry, suction ophthalmodynamometry, oculoplethysmography, modified oculopneumoplethysmography, and Doppler flow studies with graded arteriography for the detection of carotid artery stenosis. Compression ophthalmodynamometry and suction ophthalmodynamometry were the most accurate tests in this series with the results of both types of ophthalmodynanometry almost identical. A new, noninvasive procedure, oculocerebrovasculometry, was also performed in a slightly different group of patients. This procedure has theoretic advantages over the others tested because it measures directly the intraocular pressure as the end point of the test.

Carotid Arteries↗
PubMed2000

Venous opthalmodynamometry: a noninvasive method for assessment of intracranial pressure.

OBJECT: The goal of this study was to examine the potential use of ophthalmodynamometry in the noninvasive assessment of intracranial pressure (ICP). Under normal conditions, pressure within the central retinal vein is equal to or greater than ICP, because the central retinal vein basses through the optic nerve before it drains into the cavernous sinus. The optic nerve sheath is the place where ICP affects retinal venous pressure. Suction ophthalmodynamometry is an established method of investigation in ophthalmology to determine the pressure of the central retinal artery. Although observations of papilledema and lack of venous pulsations are commonly used to provide a vague assessment of ICP, ophthalmodynamometry may be used to determine the pressure of the central retinal vein. This venous pressure has never been compared with ICP. METHODS: In this study the pressure of the central retinal vein was recorded in 22 patients who underwent continuous simultaneous registration of ICP for various reasons, mainly for suspected hydrocephalus. A comparison of the two pressures was made. The results indicated a highly significant linear correlation between central retinal vein pressure and ICP. These results are of great practical value because up-to-date reliable ICP monitoring has only been possible by using invasive means, by placing a probe extradurally or subdurally into the brain parenchyma or a ventricle. CONCLUSIONS: Ophthalmodynamometry can be relevant for momentary assessment and is not suitable for continuous monitoring. However, this technique can easily be repeated and may be used whenever increased ICP is suspected in a patient suffering from hydrocephalus, brain tumors, or head injury.

Adolescent↗
PubMed1997

Contact lens tonometry--application in humans.

PURPOSE: To establish a standard clinical procedure for measuring intraocular pressure (Po) with the contact lens tonometer (CLT), to demonstrate possibilities for analyzing ocular pulsation and performing ophthalmodynamometry. METHODS: A reliable histogram-based analyzing system for determining Po is used. First, the ocular pressure was registered with the CLT method and compared with the Goldmann applanation pressure, measured immediately beforehand. Second, ocular pulsation was studied by recording Po for 30 to 70 seconds, and the pulse amplitude was then analyzed. Third, an ophthalmodynamometry method during slit-lamp examination was tested. The central retinal artery was observed through the contact lens while the appositional force was elevated. A mark was set at the systolic and diastolic pressure while observing arterial pulsation (similar to the Korotkoff sounds). RESULTS: Compared with the Goldmann method measurements, Po obtained with the CLT method yielded a linear regression of r = 0.7 (right eye) and r = 0.68 (left eye), and was therefore highly significant (P < 0.0001, two-tailed). Analysis of the pulse amplitude showed great variability (range, 1 to 9 mm Hg; means, 2.9 mm Hg [right eye] and 3.0 mm Hg [left eye]). The dependence of the pulse amplitude on Po and age was shown with a correlation coefficient of r = 0.55 and r = 0.59, respectively. The difference between the right and left eye of the person was < 0.5 mm Hg. CONCLUSION: The CLT can be used during slit-lamp examination and permits tonometry during ophthalmoscopy, ocular pulsation assessment at different intraocular pressures, and ophthalmodynamometry.

Blood Pressure↗
PubMed1981

Ischemic oculopathy. A manifestation of carotid artery disease.

Six patients experienced ischemic oculopathy, a condition in which there is ischemia in both the anterior and posterior segments of the eye caused by occlusive carotid artery disease. The abnormalities in the anterior segment include episcleral vascular congestion, anterior chamber flare and cells, a mid-dilated, sluggish, or unreactive pupil, rubeosis iridis, and abnormal intraocular pressure. The posterior segment abnormalities include ischemic insults to the retina or optic nerve, venous-stasis retinopathy, and low ophthalmodynamometry values. Ophthalmodynamometry is particularly helpful in recognizing the pathogenesis of this disorder. Superficial temporal artery-middle cerebral artery anastomosis surgery may have particular merit for patients with ischemic oculopathy.

Aged↗
PubMed1995

A comparison of colour Doppler imaging of orbital vessels and other methods of blood flow assessment.

BACKGROUND: Comparison of the haemodynamic measurements obtained by colour Doppler imaging and other methods of ocular blood flow measurements was desired. METHODS: The blood velocity findings from colour Doppler imaging of patients with central retinal vein occlusion were compared to the results of fluorescein video-angiography, continuous tonography and ophthalmodynamometry. RESULTS: Patients with low or undetectable blood velocities in the central retinal vein had longer retinal dye transit times on fluorescein video-angiography. Tonography showed a positive correlation with the velocities in the ophthalmic artery, but ophthalmodynamometry showed a negative correlation with these velocities. CONCLUSION: The relationships between the blood velocities in orbital vessels and other blood flow measurements emphasise that there is a complex interaction of the blood flow parameters. Care must therefore be taken when interpreting the results of studies.

Aged↗
PubMed1993

Comparison of noninvasive methods to derive the mean central retinal artery pressure in man.

PURPOSE: The pressure within the ophthalmic artery can be estimated by several noninvasive procedures based on measurements of the pressure either within the central retinal artery (CRA) or the brachial artery. In this study we compared 5 methods of deriving the mean pressure within the ophthalmic artery in 10 healthy volunteers 21 to 31 years of age. METHODS: The pressure within the ophthalmic artery was calculated from estimates of the systolic and diastolic pressures within the CRA derived by suction ophthalmodynamometry (s-ODM), compression ophthalmodynamometry (c-ODM), interpolation from scleral compression/intraocular pressure (IOP) conversion tables, and measurements of the brachial blood pressure (BP). RESULTS: Group average CRA pressure values varied significantly across techniques, with the largest difference among methods being about 15 mm Hg. CRA pressures derived by s-ODM or c-ODM and direct measurements of the IOP yielded statistically identical values. These latter values were significantly lower than CRA pressures estimated by either scleral compression/IOP conversion tables, or those predicted from brachial BP measurements with the arm held up alongside the head, both of which produced equivalent values. The highest estimates of CRA pressures were obtained when brachial BP values were derived with the arm in its normal anatomical position. CONCLUSION: The patency of the vascular network to the eye and subsequent perfusion of intraocular neural tissue essential to normal visual function can be evaluated by simple clinical procedures. Although all techniques to estimate the pressure in the ophthalmic artery are relatively simple to use, they do not all yield the same absolute values and consequently should be interpreted in this light when used for either clinical or research purposes.

Adult↗