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J. Bland, Douglas Altman (1986)
STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENTThe Lancet, 327
R. Copetti, L. Cattarossi (2009)
Optic nerve ultrasound: artifacts and real imagesIntensive Care Medicine, 35
Li-Juan Wang, Li-min Chen, Ying Chen, Li-Yang Bao, Nan-nan Zheng, Yu-zhi Wang, Y. Xing (2018)
Ultrasonography Assessments of Optic Nerve Sheath Diameter as a Noninvasive and Dynamic Method of Detecting Changes in Intracranial PressureJAMA Ophthalmology, 136
Letters reestablished and venous pulsations ceased, suggesting arte- it is essential that we actually understand what in fact is being riovenous fistula closure and subsequent venous thrombo- measured. Additionally, the use of correlation may be an in- sis. The worsening venous occlusive signs at 2 weeks support adequate method to represent and analyze the data. To be clini- this hypothesis. cally useful, the change in the size of the sonographic finding Among other vascular complications, RBA must reliably indicate a change in ICP. Correlation simply states may result in a CRAVF. The intraconal space should be that the 2 findings move in the same direction. As can be seen approached cautiously, with careful attention to vital from the extreme right side of their Figure 1, a patient whose neurovascular structures. ICP falls by nearly 200 mm of water may have a change in so- nographic diameter from as little as 0.5 mm to as much as Vincent Sun, MD 2.5 mm, and these extremes overlap with nearly every other Errol W. Chan, MBBS, FRCOphth, FRCSEd patient studied. Representation of the data using a Bland- Mohab Eldeeb, MBBCh Altman plot would have indicated this limitation. John C. Chen, MD, FRCSC
JAMA Ophthalmology – American Medical Association
Published: Nov 30, 2018
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