Dynamic changes in optic disc morphology, choroidal thickness, anterior chamber parameters, and intraocular pressure during Valsalva maneuver

Mete, Alper; Kimyon, Sabit; Saygılı, Oğuzhan; Evişen, Alper; Pamukcu, Can; Çeri, Seda; Güngör, Kıvanç

doi:10.5935/0004-2749.20160061

Cited by 9 publications

(6 citation statements)

References 23 publications

(50 reference statements)

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“…Mete et al showed that VM decreases the central corneal thickness and anterior chamber depth while increasing IOP, pupil diameter, and lens thickness. Both Falcão et al and Mete et al found that VM does not change the subfoveal choroidal thickness. Khan et al showed that VM does not significantly change the pulsatile ocular blood flow in primary open angle and normal tension glaucoma .…”

Section: Discussionmentioning

confidence: 91%

Doppler ultrasonographic measurement of short‐term effects of valsalva maneuver on retrobulbar blood flow

Kimyon

Mete

Mete³

2017

J of Clinical Ultrasound

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Section: Discussionmentioning

confidence: 91%

Doppler ultrasonographic measurement of short‐term effects of valsalva maneuver on retrobulbar blood flow

Kimyon

Mete

Mete³

2017

J of Clinical Ultrasound

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“…Other investigations noted changes in the anterior segment, such as anterior chamber narrowing. 20,28,29 However, the choroidal thickness in the macular area did not change, and the anterior choroidal changes might have caused the increase in IOP during VM. 20,28,29 Contrary to these studies, others concluded that the VM causes an increase in choroidal thickness.…”

Section: Discussionmentioning

confidence: 92%

Choroidal vascularity index changes during the Valsalva manoeuvre in healthy volunteers

Sevik

Çam

Aykut

et al. 2021

Ophthalmic Physiologic Optic

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To evaluate the effects of the Valsalva manoeuvre (VM) on the choroidal vascularity index (CVI) in healthy volunteers.Methods: This prospective, cross-sectional study included 60 eyes of 30 healthy volunteers. Enhanced depth imaging-optical coherence tomography scans of both eyes involving the fovea were taken, and a 1500 μm subfoveal choroidal area was selected for image binarization with open-access Fiji software. The binarized image was segmented into the stromal area (SA) and luminal area (LA), and CVI was calculated as the ratio (%) of LA to the total choroidal area (TCA). CVI, subfoveal choroidal thickness (SFCT), IOP, systolic and diastolic blood pressure were evaluated at rest and during the VM.Results: During the VM, a mean ± standard deviation increase in LA (0.02 ± 0.05 mm 2 , p < 0.001) and CVI (1.72 ± 2.83%, p < 0.001) was observed, whereas SA (−0.02 ± 0.05 mm 2 , p < 0.001) decreased. There was no significant change in TCA (0.00 ± 0.03 mm 2 , p = 0.55) or SFCT (1.05 ± 10.92 μm, p = 0.46). There was a moderate positive correlation between the spherical equivalent refractive error (SE) and SFCT both at rest and during VM (r 58 = 0.49, p < 0.0005 and r 58 = 0.49, p < 0.0005, respectively). However, there was no significant correlation between SE and CVI either at rest or during VM (p = 0.11 and 0.06, respectively). In a multiple linear regression analysis, CVI was only associated with SFCT; however, SFCT was also associated with SE, both at rest and during VM (p < 0.001). Conclusion: Valsalva manoeuvre increases CVI by choroidal vascular dilation as demonstrated by an increase in LA and a decrease in SA. Researchers should be careful about unintentional VM during examinations. K E Y W O R D S choroidal vascularity index, enhanced depth imaging optical coherence tomography, subfoveal choroidal thickness, Valsalva manoeuvre How to cite this article: Sevik MO, Çam F, Aykut A, Dericioğlu V, Şahin Ö. Choroidal vascularity index changes during the Valsalva manoeuvre in healthy volunteers.

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“…Physiological conditions may change the ACD measurement. Mete et al found that the valsalva maneuvers reduce it by anterior displacement of iridolenticular diaphragm during this exercise [17]. Pregnancy was found to vary ACD in the third trimester versus postpartum period; these changes were not statistically significant, but the changes were attributed to CT change as a response to stromal water retention by hormonal effect [18].…”

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confidence: 87%

Clinical features of the Anterior Chamber Depth

Angel¹,

Gonzalez²,

Jorge³

2021

Int J Ophthalmol Clin Res

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Anterior Chamber Depth (ACD) plays an important role in several eye conditions, including inflammatory eye processes, keratoconus, endothelial cell density loss (ECDL), oxidative stress in endothelial cells, glaucoma surgical interventions, phacoemulsification surgery, anterior chamber dimensions, intraocular lens (IOL) formula calculations and surgical post refractive errors.ACD corresponds to the distance between the corneal endothelium to the anterior lens capsule. Some authors may include the corneal thickness (CT) in this term, increasing approximately 0.5mm, corresponding to the average CT in mm. Although this is not a consensus, it is usually specified as ACD-CT [1]. ACD varies with age and gender. It has an inverse proportional relation with age, and directly proportional relation with the anterior chamber angle (ACA), and axial length (AL) [2,3]. Moreover, for every millimeter increase in AL the ACD distance increases by 0.07 mm, and by every year increment in a patient's life the ACD decreases by 0.005mm. This led to the following formulas; estimated ACD [3.339 -0.005(age in years)] and ACD [0.07(axial length in mm)+1.4892] [4]. Other reported rates of ACD shallowing per year have been described, by Xu in the Beijing Eye Study at 9 μm/year [5] Fernandez-Vigo by 10.4 μm/year [6], Rufer 11.5 μm/year [7], Sun by 11.9 μm/year [8] Sng by 15 μm/year [9] and Yan by 17 μm/year [10]. The relevancy of this issue, albeit the immense variations just described, lies in the young individual that receives an IOL. Given their theoretically

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Dynamic changes in optic disc morphology, choroidal thickness, anterior chamber parameters, and intraocular pressure during Valsalva maneuver

Abstract: VM may cause transient changes in IOP, optic disc morphology, and anterior chamber parameters.

Cited by 9 publications

References 23 publications

Doppler ultrasonographic measurement of short‐term effects of valsalva maneuver on retrobulbar blood flow

Doppler ultrasonographic measurement of short‐term effects of valsalva maneuver on retrobulbar blood flow

Choroidal vascularity index changes during the Valsalva manoeuvre in healthy volunteers

Clinical features of the Anterior Chamber Depth

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