The effects of Valsalva manoeuvre on Ocular Response Analyzer measurements

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dc.contributor.authorPalamar M.
dc.contributor.authorDag M.Y.
dc.contributor.authorYagci A.
dc.date.accessioned2019-10-26T21:23:05Z
dc.date.available2019-10-26T21:23:05Z
dc.date.issued2015
dc.departmentEge Üniversitesien_US
dc.description.abstractBackground: The aim was to evaluate the effects of the Valsalva manoeuvre on Ocular Response Analyzer (ORA) measurements. Methods: A total of 152 eyes of 76 healthy individuals were included. The biomechanical properties of cornea, including corneal hysteresis (CH), corneal resistance factor (CRF) and intraocular pressure (IOP) parameters, namely, cornea compensated IOP (IOPcc) and Goldmann correlated IOP (IOPg) as measured with ORA were obtained before and during the Valsalva manoeuvre. Wilcoxon test for group analysis, Mann-Whitney test for intergroup analysis, Generalized Estimating Equation, and Spearman's test for correlation analysis were used. Results: The mean age of the 76 subjects (52 female) was 34.18±10.20 years (range, 21 to 58 years). The mean IOPcc was 14.50±0.30 mmHg before and 19.80±0.60 mmHg during the Valsalva manoeuvre (p<0.001). The mean IOPg before the Valsalva manoeuvre was 15.02±0.33 mmHg and during was 20.18±0.63 mmHg (p<0.001). The mean corneal hysteresis was 11.40±0.15 mmHg before Valsalva manoeuvre, and 10.60±0.16 mmHg during Valsalva manoeuvre (p<0.001). Pre-Valsalva manoeuvre mean corneal resistance factor was 11.97±0.16 mmHg, whereas during the Valsalva manoeuvre, the mean corneal resistance factor was 12.06±0.20 mmHg (p<0.001). There was no correlation between age and either pre- or during-Valsalva manoeuvre measurements. The change in IOPcc and corneal hysteresis before and during Valsalva manoeuvre showed no intersexual difference; however, IOPg and corneal resistance factor change before and during Valsalva manoeuvre were significantly higher in male subjects. A negative correlation between pre-Valsalva manoeuvre corneal hysteresis and pre- and during-corneal resistance factor difference (r=-0.167) was detected. Conclusions: Valsalva manoeuvre causes a statistically significant increment in IOPcc, IOPg and corneal resistance factor and statistically significant decrement in corneal hysteresis. For this reason, to obtain reliable results, ORA measurements should be performed in suitable positions and with clothes that do not increase thoracic or abdominal pressure. © 2015 The Authors.en_US
dc.identifier.doi10.1111/cxo.12303en_US
dc.identifier.endpage450en_US
dc.identifier.issn0816-4622
dc.identifier.issue5en_US
dc.identifier.pmid26390907en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage447en_US
dc.identifier.urihttps://doi.org/10.1111/cxo.12303
dc.identifier.urihttps://hdl.handle.net/11454/17031
dc.identifier.volume98en_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.language.isoenen_US
dc.publisherBlackwell Publishing Ltden_US
dc.relation.ispartofClinical and Experimental Optometryen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectCorneaen_US
dc.subjectCorneal hysteresisen_US
dc.subjectCorneal resistance factoren_US
dc.subjectIntraocular pressureen_US
dc.subjectOcular Response Analyzeren_US
dc.subjectValsalva manoeuvreen_US
dc.titleThe effects of Valsalva manoeuvre on Ocular Response Analyzer measurementsen_US
dc.typeArticleen_US

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