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Biomedical subjects

W D Ulrich

Publications and source records attributed to W D Ulrich.

At least 37 records · Page 2Linked to original sources
PubMed1985

[Oculo-oscillodynamography, a new procedure for the determination of ophthalmic artery blood pressure and ocular pulse curve analysis].

OODG is a diagnostic method permitting assessment of ocular pulse curves and objective determination of blood pressures in the ophthalmic circulatory system (retinal and ciliary arterial blood pressures) simultaneously for both eyes, without dilatation of the pupils. Calibrated scleral suction cups pneumatically connected to a sensitive transducer are used to provide well reproducible ocular pulse recordings. The systolic retinal and ciliary arterial blood pressures and the diastolic ocular blood pressure are determined at artificially elevated IOPs from typical changes in the ocular pulse curves.

Arterial Occlusive Diseases↗
PubMed1985

Oculo-oscillo-dynamography: a diagnostic procedure for recording ocular pulses and measuring retinal and ciliary arterial blood pressures.

An objective noninvasive diagnostic procedure permitting continuous registration of ocular arterial pulsation and determination of retinal and ciliary arterial blood pressures is presented. Arterial pulsation of both eyes is recorded using two infrasound transducers which are connected pneumatically with suction cups placed temporally on the sclerae. By means of a suction pump the intraocular pressure (IOP) of both eyes can be raised artificially to desired values. It is thus possible to study the ocular pulse oscillogram at different IOP values and to determine retinal and ciliary arterial blood pressures without having to perform ophthalmoscopy. Results from first tests of the oculo-oscillo-dynamograph device and data obtained from 30 healthy persons are discussed.

Arteries↗
PubMed1982

[Noninvasive diagnosis of occlusive processes of the brachiocephalic arteries: Doppler sonography compared to ophthalmodynamometry and ophthalmodynamography].

97 patients with suspected cerebrovascular disease were examined using ophthalmodynamometry/ophthalmodynamography and dopplersonography. In 49 of the patients we found haemodynamic changes typical of brachio-cephalic artery occlusion processes. In 36 patients angiography was performed either as a preparation for vascular surgery or for further clarification. Ophthalmodynamometry/ophthalmodynamography examination yielded diagnosis in 87%, dopplersonography and combined use of ophthalmodynamometry/ophthalmodynamography and dopplersonography in 94% of the brachio-cephalic artery occlusion processes.

Adolescent↗
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↗
PubMed1976

Effects of low-intensity ultrasound on the central nervous system of primates.

The brains of anesthesized squirrel monkeys were exposed to 2.25 to 5 MHz ultrasound at low intensities (average power from 3 mW/cm2 to 0.9 W/cm2). The exposure produced evoked potentials recorded by EEG electrodes chronically implanted in the midline parietal region. Computer analysis of the waveforms showed that ultrasound produced a transient upward shift in both the peak frequency and in its amplitude. Complete adaptation occurred with 3 min of continuous exposure to either CW or pulsed irradiation.

Adaptation, Physiological↗