Eye ◽  
2021 ◽  
Author(s):  
Ting Zhang ◽  
Yantao Wei ◽  
Zhaotian Zhang ◽  
Wei Chi ◽  
Lujia Feng ◽  
...  

Abstract Introduction To investigate the incidence and causes of intraoperative choroidal detachment (CD) during small-gauge vitrectomy, as well as the anatomic and visual outcomes. Methods We retrospectively reviewed the medical records of 1026 consecutive patients who underwent small-gauge vitrectomy from June 2017 to December 2018 at Zhongshan Ophthalmic Centre, Guangzhou, China. Data on the presence, location, and extent of intraoperative CD and its relationship to the infusion cannula were collected. Patient demographic characteristics and postoperative anatomic and visual outcomes were also assessed. Results A total of six cases were found to have intraoperative CD, including two with serous CD, three with limited haemorrhagic CD, and one with CD caused by inadvertent perfusion of gas during air/fluid exchange. Retraction of the infusion cannula and acute ocular hypotony were found to be the main causes of intraoperative CD in five out of the six cases. The best-corrected visual acuity of all cases significantly improved after the surgery. Conclusion The incidence of intraoperative CD during small-gauge vitrectomy is low; the predominant causes are retraction of the infusion cannula and acute ocular hypotony. Immediate awareness and timely closure of the incision may contribute to a better surgical prognosis.


2020 ◽  
pp. 247412642097197
Author(s):  
Jacob S. Duker ◽  
Michael J. Venincasa ◽  
Pedro F. Monsalve ◽  
Armando L. Garcia ◽  
Sander R. Dubovy ◽  
...  

Purpose: This work aims to compare spatial relationships between the crystalline lens and vitrectomy instruments of different gauges. Methods: Eight phakic eyes recovered from deceased donors were used after fixation. Valved trocars (27-gauge, 25-gauge, and 23-gauge) were sequentially placed in the superotemporal quadrant 4 mm posterior to the limbus in each eye. Intraocular relationships of vitrectomy and curved endolaser probes were measured for each gauge. Results: There were no significant differences in maneuverability between instruments of different gauges. The mean distance from instrument to lens at the geometric center of the globe was 5.5 mm. Vitrectomy probes of all gauges could access the peripheral retina on both sides of the sclerotomy in the 3 to 4 o’clock position adjacent to the sclerotomy without touching the lens. The instruments could be advanced without lens touch to contact the retina within at least 2 mm of the ora serrata 180° away from the insertion site. Conclusions: Vitrectomy and curved endolaser probes achieved similar maneuverability relative to the lens regardless of gauge. This study confirms that small-gauge vitrectomy instruments have a considerable range of safe access to the peripheral retina in phakic eyes from a single sclerotomy.


2009 ◽  
Vol 24 (S1) ◽  
pp. S77-S81 ◽  
Author(s):  
Thorsten Manns ◽  
André Rothkirch ◽  
Berthold Scholtes

This paper deals with the implementation of a theoretically described method to determine residual stresses in real space directly by means of small gauge volumes. For this purpose, beam limiting masks were designed, manufactured, and investigated in first experiments. Image series taken with a position sensitive CCD camera demonstrate the ability to detect interferences from gauge volumes beneath the sample surface by defined slit geometries. The experiments show that due to the highly absorbing masks the amount of detectable photons is poor, and thus long exposure times are necessary to receive suitable data. For increasing measurement depths (altering masks) a decrease in the intensity can be detected which leads to the assumption that the diffracted photons originate from deeper regions in the material. A model was developed to simulate the diffraction conditions with different mask layouts and material properties. Modeling yields consistent results with experimental data, and thus provides a basis for further improvements of the experimental setup and the realization and assessment of residual stress measurements.


1997 ◽  
Vol 20 (1) ◽  
pp. 14-17 ◽  
Author(s):  
Y. L. Cheng ◽  
C.C. Shek ◽  
A.K.W. Wong ◽  
F.K.M. Wong ◽  
K.F. Chau ◽  
...  

This study validates Ing's partial dialysate collection method, which employs proportionate collection using a side tube capped with a small-gauge plastic needle. The urea nitrogen and creatinine levels of the small representative fraction of spent dialysate collected in the above fashion are undistinguishable from those obtained from the total spent dialysate. The estimated urea nitrogen removed during hemodialysis using this approach is similar to that using the total dialysate collection method; Ing's method is simple and useful in quantifying the dialysis dosage and in its assessment of the nutritional status of patients on hemodialysis.


1859 ◽  
Vol 5 (29) ◽  
pp. 301-348
Author(s):  
J. C. B.

Aye, every inch a King, in all his pompous vanity, his reckless passion, his unstable judgment, a thorough king, whom even madness could not dethrone from the royal habits of authority, of strenuous will, and of proud predominance. As the highest mountain summit becomes the fearful beacon of volcanic flame, testifying in lurid characters to the world's deep heart-throes, so this kingliest of minds—he who in his little world has been the summit and the cope of things—becomes, in the creative hand of the poet, the visible outlet of those forces which devastate the soul. We stand by in reverential awe, despairing, with our small gauge of criticism, to estimate the forces of this human Etna. Oppressed by the power and magnitude of the passions, as depicted in this most sublime and awful of poetic creations, it is only after the senses have become accustomed to the roar and turmoil that we throw off the stupor, and dare to look down upon the throes of the Titan, and begin to recognize the distinctive features of the fierce commotion. Even then we must stand afar off; for not in Lear, as in others of the poet's great characters, can one for a single moment perform the act of mental transmutation. In Hamlet, for instance, the most complex of all, many a man may see reflected the depths of his own soul. But Lear is more and less than human in its isolated grandeur, in the force and depths of its passions, in its abstraction from accidental qualities. In the breadth of his strength and weakness he is painted like one of those old gods, older and greater than the heathen representatives of small virtues and vices—the usurping vulgarities of polytheism. The true divinities of Lear were old, like himself very old and kingly—Saturn and Rhea, the autochthones of the heavens; even as his qualities are laid upon the dark and far off, yet solid and deep foundations of moral personality. Well might this King of sorrows exclaim, in the words of the World-spirit, to those who attempt to tear his passions to tatters before the footlights; yea, even to the more reverent efforts of critics— “Du gleichst dem Geist den du begreifst, Nicht mir!”


Vitrectomy ◽  
10.5772/33295 ◽  
2012 ◽  
Author(s):  
Rupan Trikha ◽  
Nicole Beharry ◽  
David G.

2019 ◽  
pp. 91-96
Author(s):  
V. D. Kukhar ◽  
◽  
A. E. Kireeva ◽  
A. N. Pasko ◽  
◽  
...  
Keyword(s):  

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