Purtscher-like retinopathy associated with cerebro- or cardiovascular surgery

Purpose: To report the findings in five patients of Purtscher-like retinopathy that developed after cerebro- or cardiovascular surgeries. Observations: Three women and two men with a mean age of 56.6 years were studied. They had had cerebro- or cardiovascular disease that was treated by major vascular surgery. Postoperatively, all of the patients developed multiple patches of retinal whitening in the area corresponding to the radial peripapillary capillaries in the posterior pole of the eye uni- or bilaterally. In two patients, the optic nerve head was involved which affected their vision severely. Hematological examinations showed hypercoagulable state after the surgeries. The retinal pathologies abated with time. Conclusions and importance: These results indicate that major cardio- or cerebrovascular surgeries can cause Purtscher-like retinopathy. The hypercoagulable state and specific structures of the radial peripapillary capillaries may play a role in pathogenesis of this disease

DELP 1984年度中部沖縄トラフ研究航海報告 : V.中央地溝および付近の地形・地質

Detailed survey by means of PDR, single channel water-gun and air-gun, multi-channel air-gun, proton and three component magnetometers and dredger revealed five segments of central grabens which are located in the axis of the Okinawa Trough of the study area. These grabens are aligned en echelon. The ""Iheya"" Graben is the most pronounced. No positive evidence was found for the existence of transform faults connecting the en echelon grabens. A basaltic ridge and knolls were newly found in the central axis of these grabens. From these central knolls and the ridge pieces of olivine basalt were dredged. These are island arc type high alumina basalts with K-Ar ages younger than 1 Ma. Some rhyolite, dacite and a small quantity of dacitic andesite younger than 1 Ma (K-Ar and fission track ages) were also dredged in the vicinity, indicating bimodal volcanism. Thus, the petrologic evidence does not support the existence of an oceanic crust but it suggests an extensional stress field in the middle Okinawa Trough. Based upon the evidence, the middle Okinawa Trough is concluded to be in a rifting stage of an incipient spreading process in the continental margin