Effects of fasting on peripapillary capillary density, peripapillary nerve fiber layer, intraocular pressure and central corneal thickness

Nilforushan, Naveed; Abolfathzadeh, Navid; Banifatemi, Mohammad; Miraftabi, Arezoo; Sardarinia, Mahsa; Alemzadeh, Sayyed Amirpooya; Nilforushan, Arian

doi:10.1007/s10792-020-01310-x

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…It has also been shown that an acute intake of nicotine can also decrease microcirculation 17. Whether or not the patient has been fasting, as well as the time of day has been found to impact the peripapillary RPC density and RNFL thickness 18. Exercise, as well as hypertension-induced through the Valsalva maneuver, have also been reported to severely decrease flow density 19,20.…”

Section: Discussionmentioning

confidence: 99%

“…These physiological changes may vary from day to day for a person and may include hydration status; blood pressure; and possibly intake of medications, caffeine, or nicotine. [16][17][18][19][20][21] Some studies have indicated that an increase in the intake of caffeine can decrease macular vessel density and macular flow area (superficial, deep, and choriocapillaris), and similar effects may be seen in peripapillary microvasculature. 16 It has also been shown that an acute intake of nicotine can also decrease microcirculation.…”

Section: Discussionmentioning

confidence: 99%

“…17 Whether or not the patient has been fasting, as well as the time of day has been found to impact the peripapillary RPC density and RNFL thickness. 18 Exercise, as well as hypertension-induced through the Valsalva maneuver, have also been reported to severely decrease flow density. 19,20 In contrast, RNFL thickness has been seen to have high reproducibility even within glaucomatous eyes and is likely less susceptible to daily physiological variation.…”

Section: Discussionmentioning

confidence: 99%

“…A possible reason for lower intersession agreement could be subclinical physiological changes occurring between visits. These physiological changes may vary from day to day for a person and may include hydration status; blood pressure; and possibly intake of medications, caffeine, or nicotine 16–21. Some studies have indicated that an increase in the intake of caffeine can decrease macular vessel density and macular flow area (superficial, deep, and choriocapillaris), and similar effects may be seen in peripapillary microvasculature 16.…”

Section: Discussionmentioning

confidence: 99%

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Repeatability and Reproducibility of 4.5 by 4.5 mm Peripapillary Optical Coherence Tomography Angiography Scans in Glaucoma and Non-Glaucoma Eyes

Shen

Urrea

Lee

et al. 2022

Journal of Glaucoma

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Précis: Peripapillary vessel parameters from optical coherence tomography angiography (OCTA) 4.5×4.5 mm scans in nonglaucomatous and glaucomatous eyes showed high repeatability and reproducibility, with higher reliability for commercially developed OCTA parameters compared with custom OCTA parameters. Purpose:The purpose of this study was to assess intrasession repeatability versus intersession reproducibility of peripapillary vessel parameters from 4.5×4.5 mm OCTA scans in nonglaucomatous eyes and glaucomatous eyes. Materials and Methods:In a longitudinal study, peripapillary OCTA scans were quantified using research-oriented custom quantification software that calculated vessel area density (VAD) and flux and clinic-oriented commercially developed software (Cirrus 11.0) that calculated perfusion density (PD) and flux index (FI). Intrasession repeatability and intersession reproducibility were evaluated using within-eye coefficient of variation (CV W ) and intraclass correlation coefficient (ICC).Results: With 127 nonglaucomatous eyes, intrasession CV W for VAD, PD, flux, and FI were 1.900%, 1.174%, 2.787%, and 1.425%, respectively. The intersession CV W were 2.039%, 1.606%, 4.053%, and 2.798%, respectively. Intrasession ICC ranged from 0.903 to 0.956, and intersession ICC ranged from 0.850 to 0.896. Among 144 glaucomatous eyes, intrasession CV W for VAD, PD, flux, and FI were: 3.841%, 1.493%, 5.009%, and 2.432%, respectively. The intersession CV W were 4.991%, 2.155%, 6.360%, and 3.458%, respectively. Intrasession ICC ranged from 0.956 to 0.969, and intersession ICC ranged from 0.918 to 0.964.Conclusions: Among nonglaucomatous and glaucomatous eyes, the majority of peripapillary OCTA vessel parameters from 4.5×4.5 mm scans had greater intrasession repeatability than intersession reproducibility. There was a greater agreement for the commercially developed quantification parameters than for their custom quantification counterparts.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Repeatability and Reproducibility of 4.5 by 4.5 mm Peripapillary Optical Coherence Tomography Angiography Scans in Glaucoma and Non-Glaucoma Eyes

Shen

Urrea

Lee

et al. 2022

Journal of Glaucoma

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“…Nilforushan et al [59] investigated the effects of fasting on IOP, CCT, RPC density, and retinal nerve fiber layer (RNFL) thickness during the Islamic fasting month of Ramadan. Twenty-seven healthy fasting volunteers were enrolled.…”

Section: Eyesmentioning

confidence: 99%

Ramadan fasting in health and disease (2020): A narrative review

Hafidh

Ali

Beshyah

2021

Ibnosina Journal of Medicine and Biomedical Sciences

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The medical literature on health aspects of Ramadan fasting (RF) is widely spread in many journals of varying access, making it less readily available to those interested in the subject. We performed a nonsystematic review of the international literature from a major online database (PubMed in 1 year [2020]). The search term “Ramadan fasting” was used, and relevant literature was narrated in a concise thematic account excluding diabetes. The publications spanned fundamental, clinical, ethical, professional, cultural, and advocacy facets. The publications predictably crossed the conventional disciplinary lines and geographical locations and appeared in journals with different access systems. The contents are presented under the emerged themes depending on the retrieved literature. This year, the basic coverage included changes in physiology, nutrition during Ramadan. However, the clinical issues included a more comprehensive range such as the impact of RF on the liver and gut, and endocrine conditions such as hypothyroidism and adrenal insufficiency. Coverage also included chronic kidney disease, maternal health and fetal well-being, cardiovascular medicine, nature and function of eyes, and neurological conditions, especially epilepsy. Sports medicine and athletes' well-being received somewhat prominent coverage. Other researchers focused on documenting patients' and health-care professionals' perceptions, attitudes, and practices during Ramadan. Health aspects of RF received a sustained academic interest with a broad spectrum in 2020. This narrative provides a scoping overview to help researchers and clinicians catch up quickly with state-of-the-art science today.

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Evaluating macular and optic nerve changes during Ramadan fasting by optical coherence tomography angiography-a prospective before-and-after study

Ettehad,

Abdollahi,

Jafarizadeh

et al. 2023

Int Ophthalmol

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Effects of fasting on peripapillary capillary density, peripapillary nerve fiber layer, intraocular pressure and central corneal thickness

Cited by 7 publications

References 34 publications

Repeatability and Reproducibility of 4.5 by 4.5 mm Peripapillary Optical Coherence Tomography Angiography Scans in Glaucoma and Non-Glaucoma Eyes

Repeatability and Reproducibility of 4.5 by 4.5 mm Peripapillary Optical Coherence Tomography Angiography Scans in Glaucoma and Non-Glaucoma Eyes

Ramadan fasting in health and disease (2020): A narrative review

Evaluating macular and optic nerve changes during Ramadan fasting by optical coherence tomography angiography-a prospective before-and-after study

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