Dr. H. Derka

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  • Dr. H. Derka
  • Albrecht von Graefes Archiv für klinische und…
  • 2006
The ophthalmodynamographic curve does not originate from the ophthalmic artery alone; as could be derived from intraoperative compression tests on the Arteria carotis communis and its two main branches, an essential part of the orbital pulsating volume ranging from 40% in a normal patient to 80% in patients suffering of thrombosis of the inner carotid(More)
  • Dr. H. Derka
  • Albrecht von Graefes Archiv für klinische und…
  • 2006
The pulsvolume in ODG depends on the transverse section of the orbital vessels and/or their anastomoses. It is subject to only very small alterations (±5%). If the conditions of measurement are varied by altering 1. volume of the ODG-pneumatic system 2. pressure of the ODG-pneumatic system 3. sensibility of the writing system volume of the ODG-pneumatic(More)
  • Dr. H. Derka
  • Albrecht von Graefes Archiv für klinische und…
  • 2004
The volumetric determination of all those tissues relevant for Opthalmodynamography (ODG) showed the lids to contribute about a quarter to the total volume; another quarter each was due to the optic bulb including optic fascicel, external bulbar musculature and orbital fat. Bulb and fascicel show no pulsations that could be detected oscillographically, fat(More)
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