Changes in spectral parameters of corneal pulse following canaloplasty
| Autor: | Katarzyna Lewczuk, Monika E. Danielewska, Aleksandra K Kicińska, Marek Rękas, Michał M. Placek |
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| Rok vydání: | 2019 |
| Předmět: |
Male
medicine.medical_specialty Intraocular pressure genetic structures medicine.medical_treatment Visual Acuity Glaucoma Cornea 03 medical and health sciences Cellular and Molecular Neuroscience 0302 clinical medicine Ophthalmology Statistical significance Heart rate medicine Glaucoma surgery Humans Postoperative Period Intraocular Pressure Aged Aged 80 and over Pulse (signal processing) business.industry Phacoemulsification Middle Aged medicine.disease eye diseases Sensory Systems Biomechanical Phenomena medicine.anatomical_structure Filtering Surgery 030221 ophthalmology & optometry Female sense organs business 030217 neurology & neurosurgery Glaucoma Open-Angle |
| Zdroj: | Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie. 257(11) |
| ISSN: | 1435-702X |
| Popis: | To ascertain whether changes in the spectral content of the corneal pulse (CP) signal, measured in vivo in primary open-angle glaucoma (POAG) patients, indirectly reflect changes in corneal biomechanics after canaloplasty. Fifteen eyes of 15 POAG patients who underwent canaloplasty combined with phacoemulsification were enrolled. Standard ophthalmic examinations were conducted before washout, pre-operatively, at days 1, 7, and 1, 3, 6, and 12 months after surgery. Non-contact measurements of the CP signal were performed at pre-washout, pre-operatively, and at 3, 6, and 12 months post-operatively. Then, amplitudes of the CP first five harmonics associated with the heart rate were estimated. Temporal changes of all considered parameters were tested at a Bonferroni-adjusted significance level set to 0.005. A decrease in the amplitude of the first harmonic and an increase in the normalized amplitude of the third harmonic (ACP3n) of the CP signal were noticed between the pre-washout and the pre-operative stages (p = 0.003 and p = 0.004, respectively). This corresponds to an increase in median intraocular pressure (IOP) values by 6.0 mmHg (p = 0.0045). After surgery, ACP3n reached the highest value at 3 months post-operatively, compared with pre-washout level (p = 0.0045). Alterations in corneoscleral stiffness caused by surgery are reflected in changes in the ACP3n value. Hence, post-operative corneal biomechanics could be monitored indirectly by this supporting indicator that can be used to estimate the time at which measures of IOP are no longer biased by the changed cornea boundary conditions caused by canaloplasty. NCT02908633 |
| Databáze: | OpenAIRE |
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