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K. K. Huber, A. Lux, K. Schmitz, A. Remky; Retrobulbar Hemodynamics Before and After Oculopression. Invest. Ophthalmol. Vis. Sci. 2008;49(13):4135.
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In this study the effect of intraocular pressure (IOP) reduction by oculopression on retrobulbar hemodynamics was tested. Colour Doppler imaging was performed in patients prior and after oculopression before cataract surgery.
Thirty patients (age 71.5 ± 9.4; 13f, 17m), prepared for cataract surgery, were included in a prospective study. Before and 5 minutes after oculopression, the IOP was measured by Tonopen (Technomed). Colour Doppler imaging (Siemens Sonoline Sienna) was used to determine the end-diastolic velocities (EDV) and peak systolic velocities (PSV) as well as resistive index (RI) before and after oculopression in the ophthalmic artery (OA), the central retinal artery (CRA), the central retinal vein (CRV) and the short posterior ciliary arteries (PCA). Furthermore, heart rate, systolic and diastolic blood pressure were measured.
After oculopression there was a significant reduction of the IOP of 4.3mmHg (p<0.0001). Colour Doppler imaging showed a significant increase of the EDV after oculopression in all studied vessels (OA +18%, p=0.0102; CRA +23%, p<0.0001; CRV +14%, p=<0.0001; TPCA +14%, p=0.0071, NPCA +16% p=0.0069). PSV also significantly increased (OA +13%, p=0.001; CRA +22%, p<0.0001; CRV +25%, p<0.0001; TPCA +21%, p<0.0001, NPCA +22% p<0.0001). The RI of the studied vessels and the cardiovascular parameters showed no significant changes before and after oculopression.
IOP reduction by a mechanical procedure, like in this study by oculopression, leads to a significant increase of flow velocities of the retrobulbar vessels; this may be due to an increase of perfusion pressure. However, it is unclear whether these effects are due to IOP reduction solely or provoked by reactive hyperemia.
Clinical Trial: :
University Aachen, Germany, Glaukoma 2004-04
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