scholarly journals Correlation between ocular biometric parameters and corneal endothelium in a sample of young Egyptian adults

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Mohamed N. Hamza ◽  
Maged Maher Roshdy ◽  
Mouamen M. Seleet ◽  
Tamer M. El Raggal
Keyword(s):  
Endothelial Cell ◽  
Cell Density ◽  
Central Zone ◽  
Peripheral Zone ◽  
Cross Sectional Study ◽  
Normative Values ◽  
Specular Microscopy ◽  
Cross Sectional ◽  
Cell Parameters ◽  
Cellular Density

Background: To evaluate the normative values of corneal endothelial cell parameters within a group of healthy young Egyptian adults using specular microscopy and to examine any correlations between endothelial parameters and refractive or biometric parameters.Methods: In this cross-sectional study, specular microscopy was used to study the right eyes of 150 healthy young volunteers and evaluated endothelial cell parameters, including cellular density, hexagonality (HEX), and coefficient of variation (CV) at 15 different points on the back corneal surface, which were later grouped into the central zone and either four quadrants or three annular zones. The same eyes underwent refractive and biometric assessments.Results: Hundred fifty healthy adults were examined, and the age ranged from 20 to 30 years, with a median of 23 (interquartile range, 21?27) years. The mean ± standard deviation of central cell density was 2902.7 ± 270.7 cells/mm2. The superior paracentral area had the lowest mean density (2895.8 cells/mm2), but the highest mean HEX (67.7%), while the inferior peripheral area had the highest mean density (3100.5 cells/ mm2) but the lowest mean HEX (64%). The difference in cell density among the three annular zones was not statistically significant (P = 0.365). However, HEX and CV in the central and paracentral zones differed statistically significantly from those of the peripheral zone (P < 0.001 and P = 0.014, respectively). Weak but non-significant correlations were detected between endothelial cell density and all measured refractive and biometric parameters.Conclusions: The findings of this study provided useful normative biometric and specular data in a specific age group and a specific population, and could be useful in planning intraocular surgery in young Egyptian adults. However, future longitudinal studies with a larger sample could refine more endothelial cell parameter specifications over time.

scholarly journals Myopia, corneal endothelial cell density and morphology in a Japanese population-based cross-sectional study: the JPHC-NEXT Eye Study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Naohiko Aketa ◽  
Miki Uchino ◽  
Motoko Kawashima ◽  
Yuichi Uchino ◽  
Kenya Yuki ◽  
...  
Keyword(s):  
Endothelial Cell ◽  
Cell Density ◽  
Contact Lenses ◽  
Population Based ◽  
Cross Sectional Study ◽  
Corneal Endothelial Cell ◽  
Endothelial Cell Density ◽  
Sectional Study ◽  
Cross Sectional ◽  
Corneal Endothelial Cell Density

AbstractThis population-based cross-sectional study was performed to determine the mean corneal endothelial cell density (ECD), coefficient of variation (CV), and hexagonality (HEX), and their associations with myopia in Japanese adults living in Chikusei city. Of 7109 participants with available data, 5713 (2331 male and 3382 female) participants were eligible for analysis. After assessing the relationship between participant characteristics and spherical equivalent refraction (SER), the association of SER with the abnormal value of ECD (< 2000 cells/mm), CV (≥ 0.40), and HEX (≤ 50%) were determined using the logistic regression models adjusting for potential confounders (age, intraocular pressure, keratometric power, height, and antihypertensive drug use). In male participants, there was no statistically significant relationships between SER and endothelial parameters. In female participants, compared to emmetropia, SER ≤ − 6 D had significantly higher odds ratio (OR) of having the abnormal value of CV (OR = 2.07, 95% confidence interval [CI] 1.39–3.10) and HEX (OR = 2.04, 95% CI 1.29–3.23), adjusted for potential confounders, indicating that the high myopia was associated with the abnormal values of CV and HEX. Further adjustment for contact lenses wear partly attenuated these associations. Association between the SER and ECD was not detected.

scholarly journals Overestimation of corneal endothelial cell density by automated method in glaucomatous eyes with impaired corneal endothelial cells

2021 ◽  
Author(s):  
Mayumi Minami ◽  
Etsuo Chihara
Keyword(s):  
Endothelial Cell ◽  
Cell Density ◽  
Close Correlation ◽  
Corneal Endothelial Cell ◽  
Endothelial Cell Density ◽  
Specular Microscopy ◽  
Cell Parameters ◽  
Automated Method ◽  
Corneal Endothelial Cell Density ◽  
Automated Methods

Abstract Purpose To determine between-method differences in corneal endothelial cell parameters using center and automated methods of non-contact specular microscopy (CellCheck software of Konan, Inc.) in glaucomatous eyes. Methods We analyzed the central corneal endothelial cell density (ECD) of 245 glaucomatous eyes using center (ECD-Ce) and automated methods (ECD-Au). Based on the ECD-Ce, we allocated subjects to Groups 1 to 10 (at 250 cells/mm2 intervals) and evaluated the ECD, coefficient of variation in cell area (CV), and percentage of hexagonal cells (HEX). Results There was a close correlation (r = 0.91) between the ECD values measured using both methods. However, ECD-Au were significantly higher than those measured by the center method when ECD-Ce was less than 2500 (in Groups 1 to 8; P < 0.001 to P = 0.006). The regression equation of (ECD-Au—ECD-Ce) = 1028–0.397*ECD-Ce shows greater deviation in eyes with lower ECD, and this difference became 0 when ECD -Ce was 2593 cells/mm2. None of the 44 subjects with an ECD-Ce of < 1000 cells/mm2 recorded an ECD-Au < 1000 cells/mm2. Compared with the center method, the automated method had higher and lower median CV and HEX values, respectively (P < 0.001). The between-method differences in both CV and HEX were negatively correlated with ECD-Ce (r = −0.49, P < 0.001 and r = −0.25, P < 0.001, respectively). Conclusion The automated method of the CellCheck software overestimates ECD in eyes with lower ECD values and may overlook risk of corneal decompensation.

scholarly journals Anterior Segment Structures in Dark Iris Chinese Patients With Unilateral Fuchs’ Uveitis Syndrome

2021 ◽  
Author(s):  
Yajing Cai ◽  
Wenjie Wu ◽  
Yingbin Wang ◽  
Suzhen Xiao ◽  
Yue Huang
Keyword(s):  
Endothelial Cells ◽  
Endothelial Cell ◽  
Anterior Segment ◽  
Cross Sectional Study ◽  
Chinese Patients ◽  
Specular Microscopy ◽  
Cross Sectional ◽  
Average Cell ◽  
Corneal Densitometry ◽  
Fuchs Uveitis Syndrome

Abstract Purpose: To compare binocular anterior segment structures in Chinese patients with dark iris and unilateral Fuchs’ uveitis syndrome (FUS).Methods: This was a cross-sectional study including 34 phakic eyes (17 patients) with unilateral FUS. Anterior segment parameters were measured by rotating Scheimpflug imaging camera, noncontact specular microscopy and anterior segment optical coherence tomography.Results: Corneal volume was higher in FUS eyes compared to unaffected eyes (p<0.05). The iridocorneal angles were larger in FUS eyes compared to contralateral eyes (p<0.05). Mean endothelial cell density (ECD) was lower, and the coefficient of variation in endothelial cell size (CV) and average cell area of endothelial cells (ACA) were higher, in FUS eyes (p<0.05). Mean densitometry values of the midstromal cornea (zones with a diameter of 0-2, 2-6, or 10-12 mm), posterior (0-2, 2-6, 10-12, or 0-12 mm), or total thickness (0-2 or 2-6 mm) were higher in FUS eyes compared with unaffected eyes (p<0.05). ECD, CV, and ACA were negatively related to densitometry values of the midstromal and posterior cornea in the FUS eyes (p<0.05). Smoothness index of iris was lager in affected eyes (p<0.05).Conclusion: In Chinese patients with unilateral FUS, loss of endothelial cells, wider iridocorneal angle, thicker cornea, higher corneal densitometry of midstromal and posterior layer, and smoother iris were observed in affected eyes compared to contralateral eyes. These data can help to elucidate anterior segment characteristics of unilateral FUS in this population.

Endothelial Cell Density and Central Corneal Thickness following Penetrating Keratoplasty of Acanthamoeba Keratitis Patients – A Retrospective Cross-Sectional Observational Study

2021 ◽  
Author(s):  
Lei Shi ◽  
Fabian Norbert Fries ◽  
Kassandra Xanthopoulou ◽  
Tanja Stachon ◽  
Loay Daas ◽  
...  
Keyword(s):  
Endothelial Cell ◽  
Observational Study ◽  
Cell Density ◽  
Central Corneal Thickness ◽  
Penetrating Keratoplasty ◽  
Corneal Thickness ◽  
Acanthamoeba Keratitis ◽  
Endothelial Cell Density ◽  
Cross Sectional ◽  
Time Point

Abstract Purpose To analyze endothelial cell density (ECD) and central corneal thickness (CCT) following penetrating keratoplasty (PKP) in Acanthamoeba keratitis (AK) patients. Patients and Methods In this retrospective, clinical, single-center, cross-sectional, observational study, patients were enrolled who underwent PKP at the Department of Ophthalmology of Saarland University Medical Center, Homburg/Saar, Germany between May 2008 and December 2016 with the diagnosis of AK. In all, 33 eyes of 33 patients (14 males, 42%) were enrolled; their mean age at the time of surgery was 39.5 ± 14.3 years. Postoperatively, AK patients received topical polyhexamethylene biguanide, propamidine isethionate, neomycin sulphate/gramicidin/polymixin B sulfate, and prednisolone acetate eye drops (5 ×/day each), and the topical treatment was tapered sequentially with 1 drop every 6 weeks over 6 months. CCT was recorded using Pentacam HR Scheimpflug tomography and ECD with the EM-3000 specular microscope before surgery and 3 and 6 months after surgery as well as after the first and second (complete) suture removal. Results ECD tended to decrease significantly from the time point before surgery (2232 ± 296 cells/mm2) to the time point 3 months after surgery (1914 ± 164 cells/mm2; p = 0.080) and to the time point after the first suture removal (1886 ± 557 cells/mm2; p = 0.066) and decrease significantly to the time point after the second suture removal (1650 ± 446 cells/mm2; p = 0.028). CCT did not change significantly over the analyzed time period (p ≥ 0.475). Conclusion In AK, endothelial cell loss does not seem to be accelerated following PKP, despite the postoperative use of diamidine and biguanide. A subsequent prospective comparative study should confirm our retrospective longitudinal analysis.

scholarly journals Reference values and factors associated with hand grip strength among older adults living in southeastern Poland

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Agnieszka Wiśniowska-Szurlej ◽  
Agnieszka Ćwirlej-Sozańska ◽  
Justyna Kilian ◽  
Natalia Wołoszyn ◽  
Bernard Sozański ◽  
...  
Keyword(s):  
Older Adults ◽  
Older People ◽  
Reference Values ◽  
Handgrip Strength ◽  
Age Groups ◽  
Cross Sectional Study ◽  
Normative Values ◽  
Dominant Hand ◽  
Cross Sectional ◽  
Factors Associated

AbstractHandgrip strength (HGS) is used as a biomarker for the state of health of older people, but the number of research publications containing the normative values of HGS in older adult populations is limited. The aim of the study was to define reference values and factors associated with HGS in older adults living in southeastern Poland. A cross-sectional study including 405 participants aged 65 and older was conducted. Handgrip strength for the dominant hand was assessed by the average of three trials using a JAMAR dynamometer. The sample was categorized into the following age groups: 65–69 years, 70–74 years, 75–79 years, 80–84 years, 85 and over. The average HGS was 19.98 kg (16.91 kg for women and 26.19 kg for men). There was a decrease in handgrip strength across the age range in both sexes. The average handgrip strength of the older people was 17.97 kg (14.47 kg for women and 25.66 kg for men) for those aged 80–85 and 16.68 kg (13.51 kg for women and 21.77 kg for men) in the group over 85 years old. In both sexes, marital status was an independent factor associated with reduced handgrip strength. In conclusion, this study described, for the first time, handgrip strength values for the southeastern Polish population aged ≥ 65 years according to age and gender.

scholarly journals A novel human donor cornea preservation cocktail incorporating a thermo-reversible gelation polymer (TGP), enhancing the corneal endothelial cell density maintenance and explant culture of corneal limbal cells

2021 ◽  
Author(s):  
Bhuvaneshwari Namitha ◽  
Munusamy Rajendran Chitra ◽  
Mathevan Bhavya ◽  
Periasamy Parikumar ◽  
Shojiro Katoh ◽  
...  
Keyword(s):  
Endothelial Cell ◽  
Cell Density ◽  
Corneal Thickness ◽  
Explant Culture ◽  
Endothelial Cell Density ◽  
P Value ◽  
Specular Microscopy ◽  
Human Donor ◽  
Corneal Preservation

Abstract Purpose McCarey-Kaufman’s (MK) medium and Optisol-GS medium are the most commonly employed media for human donor corneal preservation. In this study, we evaluated the preservation efficacy of discarded human donor corneas using a Thermo-reversible gelation polymer (TGP) added to these two media. Methods Thirteen human corneal buttons collected from deceased donors, which were otherwise discarded due to low endothelial cell density (ECD) were used. They were stored in four groups: MK medium, MK medium with TGP, Optisol-GS and Optisol-GS with TGP at 4 °C for 96 h. Slit lamp examination and specular microscopy were performed. Corneal limbal tissues from these corneas were then cultured using explant methodology one with and the other without TGP scaffold, for 21 days. Results MK + TGP and Optisol-GS + TGP preserved corneas better than without TGP, which was observed by maintenance of ECD which was significantly higher in Optisol-GS + TGP than MK + TGP (p-value = 0.000478) and corneal thickness remaining the same for 96 h. Viable corneal epithelial cells could be grown from the corneas stored only in MK + TGP and Optisol-GS + TGP. During culture, the TGP scaffold helped maintain the native epithelial phenotype and progenitor/stem cell growth was confirmed by RT-PCR characterization. Conclusion TGP reconstituted with MK and Optisol—GS media yields better preservation of human corneal buttons in terms of relatively higher ECD maintenance and better in vitro culture outcome of corneal limbal tissue. This method has the potential to become a standard donor corneal transportation-preservation methodology and it can also be extended to other tissue or organ transportation upon further validation.

Endothelial cell density and characterization of corneal endothelial cells in the Tawny Owl (Strix aluco ) using specular microscopy

2018 ◽  
Vol 22 (2) ◽  
pp. 177-182
Author(s):  
Natàlia Coyo ◽  
Marta Leiva ◽  
Daniel Costa ◽  
Rafael Molina ◽  
Olga Nicolás ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Endothelial Cell ◽  
Cell Density ◽  
Endothelial Cell Density ◽  
Specular Microscopy ◽  
Corneal Endothelial Cells ◽  
Tawny Owl ◽  
Strix Aluco

Magnitude of Uncontrolled Hypertension and Associated Factors among Adult Hypertensive Patients in Public Hospitals of Central Zone, Tigray, Ethiopia: A Cross-sectional Study 2018

2019 ◽  
Author(s):  
Assefa Iyasu Negash ◽  
Desta Siyoum ◽  
Tsega Hailemariam ◽  
Berihu Hailu Kidanu ◽  
Gebreamlak Gebremdhin Gebremeskel ◽  
...  
Keyword(s):  
Antihypertensive Medication ◽  
Multivariable Analysis ◽  
Central Zone ◽  
Cross Sectional Study ◽  
Public Hospitals ◽  
Uncontrolled Hypertension ◽  
Sectional Study ◽  
Cross Sectional ◽  
Hypertensive Patients ◽  
Co Morbidity

Abstract Background: - Uncontrolled hypertension is if SBP is ≥140 mm Hg and/or DBP ≥90 mm Hg for general hypertensive population or if SBP ≥130 mm Hg and/or DBP ≥80 mm Hg in patients with established diabetes mellitus or chronic kidney disease based on the average of two or more properly measured, seated, BP readings on each of two or more office visits. The aim of this study was to assess the magnitude of uncontrolled hypertension and associated factors among adult hypertensive patients in public hospitals of central zone, Tigray, Ethiopia, 2018. Methods:- A hospital based cross sectional study design was used. The study population was all sampled adult hypertensive patients who had follow up in public hospitals of central zone, Tigray and the data collection period was from March 01 to April 30, 2018. About 421 study participants were selected using systematic random sampling. Interviewer administered structured questionnaire, chart review checklist and measurements were used. The collected data was checked for its completeness manually and then entered and cleaned in to epi data version 3.1 and exported to Statistical packages for social science version 22 for analysis. Bivariate and multivariable analyses were done to identify factors of uncontrolled hypertension. Then those variables significant at p<0.25 with the outcome variable in bivariate analysis were selected for multivariable analysis and odds ratio with 95% confidence level was computed and p-value < 0.05 was described as a significant association in multivariable analysis. Result: - Among 421 respondents about 177(42%) had uncontrolled hypertension. Co-morbidity [AOR=0.36, (0.205, 0.631)], five to ten years duration of medication taken [AOR=0.398, (0.218, 0.725)], side effect of medication [AOR=0.542, (0.339, 0.866)] and medication adherence [AOR=4.092, (2.419, 6.924)] were significantly associated with uncontrolled hypertension. Conclusion: - In this study the magnitude of uncontrolled hypertension was high. Co-morbidity, antihypertensive medication taken for long duration, side effect of antihypertensive medication and non adherence to antihypertensive medication shows statistical association with uncontrolled hypertension.

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