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Biomedical subjects

F Wallner

Publications and source records attributed to F Wallner.

29 records · Page 2Linked to original sources
PubMed1980

[Measurement of urethral closure pressure profiles with stress performed by CO2-infusion in stressincontinent women: sources of error in methodology and modes of clinical application (author's transl)].

The measurement of urethral closure pressure with stress is limited by the compressibility of gasiform mediums, which causes damping of intraurethral pressure spikes. In this study damping could be reduced by alterations of the catheter and the connecting tubes of an aircystometer. With this modified technique 55 incontinent women were examined. The differentiation between stress- and urgeincontinence was clinically sufficient.

Adult↗
PubMedDate not supplied

[Color-coded sleep EEG power density spectra].

The colour-coded representation of transformed sleep EEG power density spectra makes it possible to demonstrate changes in sleep architecture. With the aid of this method, spectral changes in physical units can be shown. The present study also shows that sleep is a continuous process which, for clinical interpretation, urgently needs to be processed with this in mind, in particular for the investigation of the effects of psychopharmaceuticals. The method is derived mathematically, and illustrated by convincing examples. It is to be hoped that the method will be accepted without delay and its use spread rapidly.

Arousal↗
PubMedDate not supplied

Is monocular perception of depth through the rigid endoscope a disadvantage compared to binocular vision through the operating microscope in paranasal sinus surgery?

Vision through the endoscope is strictly monocular. Perception of depth (stereopsis) during ethmoid surgery through the operating microscope would be expected to be superior due to binocular view. To investigate whether monocularity of the endoscope is a disadvantage in paranasal sinus surgery, we compared stereoacuity in a model of the nasal cavity using a headlamp, an operating microscope, and a 0 degree-Hopkins-endoscope. Twenty volunteers were asked to touch defined points in a spatial model of the nasal cavity. Due to the configuration of the model, which allowed binocular vision of all contact points with headlamp, performance was significantly better than with optical instruments. Manipulations were performed faster with the endoscope than with the microscope. Under microscopic guidance more faults in point sequence were made than with the endoscope. Various monocular phenomena obviously allow sufficient spatial orientation through the endoscope, so that monocularity of the endoscope appears not to be a disadvantage for quick and safe manipulations during functional endoscopic sinus surgery.

Depth Perception↗