Effects of Formalin Inhalation on the Visual Acuity of Medical Students in a Nigerian University.

2019 ◽  
Vol 1 (1) ◽  
pp. 13-24
Author(s):  
P.C. Ugwuezumba ◽  
Jude Egwurugwu ◽  
M.C. Ohamaeme ◽  
P. Nwankpa ◽  
C.N. Ekweogu ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Medical Students ◽  
Visual Impairment ◽  
Test Group ◽  
Group A ◽  
Visual Acuity Test ◽  
High Concentrations ◽  
Nigerian University ◽  
Group B ◽  
Research Students

Abstract This study investigated the effect of formalin inhalation on visual acuity of medical students in Madonna University, Elele, Nigeria. Two hundred students (100 males and 100 females) between the ages of 16 and 25 years participated in the research. Students were grouped into two of 100 students per group (50 males and 50 females). Group A is the control, non-exposed group while group B is the test group exposed to formalin inhalation. Data collection among the randomly selected students involved a combination of self-administered and interviewer- administered questionnaires. Visual acuity test was done for distant (DV) and near (NV) visions using the Snellen’s chart and Jaeger’s chart respectively. Results of visual acuity of non-exposed and formalin-exposed male participants showed impairment in 20% and 48% of respectively for DV; 22% and 64% respectively for NV. The percentage of visual impairment in non exposed and exposed female participants was 18% and 42% respectively for DV; 24% and 26% respectively for NV. In conclusion, this study revealed a statistical significant decrease in visual acuity among medical students exposed to formalin inhalation compared to the non-exposed students. Visual impairment was more in males than in females. It is therefore recommended that the concentration of formalin in formalin-treated cadavers used by medical students be re-evaluated and proper ventilation in dissecting rooms/halls be ensured to avoid exposures to abnormally high concentrations of formaldehyde. Key Words: Visual Acuity, Formalin, Inhalation, Snellen’s chart, Jaeger’s chart, Medical Students.

Single-choice or multiple true false questions (Kprime):Direct comparison of online tests in pharmacology over one year (Preprint)

2021 ◽  
Author(s):  
Joachim Neumann ◽  
Stephanie Simmrodt ◽  
Beatrice Bader ◽  
Bertram Opitz ◽  
Ulrich Gergs
Keyword(s):  
Medical Students ◽  
Multiple Choice ◽  
Test Group ◽  
Learning Objectives ◽  
Multiple Choice Questions ◽  
Online Test ◽  
True Answer ◽  
Group A ◽  
One Year ◽  
Group B

BACKGROUND There remain doubts about whether multiple choice answer formats (single choice) offer the best option to encourage deep learning or whether SC formats simply lead to superficial learning or cramming. Moreover, cueing is always a drawback in the SC format. Another way to assess knowledge is true multiple-choice questions in which one or more answers can be true and the student is not aware of how many true answers are to be anticipated (K´ or Kprime question format). OBJECTIVE Here, we compared both single-choice answers (one true answer, SC) with Kprime answers (one to four true answers out of four answers, Kprime) for the very same learning objectives in a study of pharmacology in medical students. METHODS Two groups of medical students were randomly subjected to a formative online test: group A) was first given 15 SC (#1-15) followed by 15 different Kprime questions (#16-30). The opposite design was used for group B. RESULTS The mean number of right answers was higher for SC than for Kprime questions in group A (10.02 vs. 8.63, p < 0.05) and group B (9.98 vs. 6.66, p < 0.05). The number of right answers was higher for nine questions of SC compared to Kprime in group A and for eight questions in group B (pairwise T-Test, p < 0.05). Thus, SC is easier to answer than the same learning objectives in pharmacology given as Kprime questions. One year later, four groups were formed from the previous two groups and were again given the same online test but in a different order: the main result was that all students fared better in the second test than in the initial test; however, the gain in points was highest if initially mode B was given. CONCLUSIONS Kprime is less popular with students being more demanding, but could improve memory of subject matter and thus might be more often used by meidcal educators.

scholarly journals The Bone Buttress Theory: The Effect of the Mechanical Loading of Bone on the Osseointegration of Dental Implants

Biology ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 12
Author(s):  
David Chavarri-Prado ◽  
Aritza Brizuela-Velasco ◽  
Ángel Álvarez-Arenal ◽  
Markel Dieguez-Pereira ◽  
Esteban Pérez-Pevida ◽  
...  
Keyword(s):  
Dental Implants ◽  
Mechanical Loading ◽  
Bone Growth ◽  
Bone Matrix ◽  
Test Group ◽  
Control Group ◽  
Group A ◽  
Bone To Implant Contact ◽  
The Stability ◽  
Group B

Objectives: To determine the effect of mechanical loading of bone on the stability and histomorphometric variables of the osseointegration of dental implants using an experimental test in an animal model. Materials and Methods: A total of 4 human implants were placed in both tibiae of 10 New Zealand rabbits (n = 40). A 6-week osseointegration was considered, and the rabbits were randomly assigned to two groups: Group A (Test group) included 5 rabbits that ran on a treadmill for 20 min daily during the osseointegration period; Group B (Controls) included the other 5 that were housed conventionally. The monitored variables were related to the primary and secondary stability of the dental implants (implant stability quotient—ISQ), vertical bone growth, bone to implant contact (BIC), area of regenerated bone and the percentage of immature matrix. Results: The results of the study show a greater vertical bone growth (Group A 1.26 ± 0.48 mm, Group B 0.32 ± 0.47 mm, p < 0.001), higher ISQ values (Group A 11.25 ± 6.10 ISQ, 15.73%; Group B 5.80 ± 5.97 ISQ, 7.99%, p = 0.006) and a higher BIC (Group A 19.37%, Group B 23.60%, p = 0.0058) for implants in the test group, with statistically significant differences. A higher percentage of immature bone matrix was observed for implants in the control group (20.68 ± 9.53) than those in the test group (15.38 ± 8.84) (p = 0.108). A larger area of regenerated bone was also observed for the test implants (Group A 280.50 ± 125.40 mm2, Group B 228.00 ± 141.40 mm2), but it was not statistically significant (p = 0.121). Conclusions: The mechanical loading of bone improves the stability and the histomorphometric variables of the osseointegration of dental implants.

Resorbable Collagen Barrier Impeding the Extrusion of Obturating Material in Primary Molars Undergoing Resorption – A Randomized Clinical Trial

2021 ◽  
Vol 45 (5) ◽  
pp. 312-316
Author(s):  
Mishra Neha Sanjeev ◽  
Harsimran Kaur ◽  
Sandeep Singh Mayall ◽  
Rishika ◽  
Ramakrishna Yeluri
Keyword(s):  
Test Group ◽  
Primary Molars ◽  
Control Group ◽  
Chi Square ◽  
Significance Level ◽  
Significant Difference ◽  
Chi Square Test ◽  
Group A ◽  
Group B ◽  
And Control

Objective: To evaluate the effectiveness of placing a resorbable collagen barrier in impeding the extrusion of obturation material in primary molars undergoing resorption. Study design: All the 94 canals in 47 mandibular molars were allocated to 2 groups- Group ‘A’- 47 canals with collagen barrier (Test group) and Group ‘B’- 47 canals without collagen barrier (Control group) based on randomization protocol. Pulpectomy was performed and obturation of both test and control canals were radiographically assessed. Pearson’s chi – square test was applied to analyze the results. The significance level was predetermined at p &lt; 0.05. Results: Among the test group, 93.6% of the canals showed no extrusion while, 6.4% showed visible extrusion of the material outside the apex. In the control group, 83% showed no extrusion whereas 17% of the canals showed visible extrusion outside the apex. But no significant difference was noted (p&gt;0.05). Conclusion: The placement of resorbable collagen barrier in the apical third of the canal prevented the extrusion of obturating material beyond the apex in resorbing primary molars.

scholarly journals Prophylactic corneal cross-linking in LASIK surgery: effects on visual outcome and recovery time

2020 ◽  
Vol 17 (1) ◽  
pp. 61-68
Author(s):  
Dominique Clare Oh ◽  
Yiong Huak Chan ◽  
Sao Bing Lee ◽  
Jovina Li Shuen See
Keyword(s):  
Visual Acuity ◽  
Side Effects ◽  
Recovery Time ◽  
Visual Outcome ◽  
Cross Linking ◽  
Safe Procedure ◽  
Distance Visual Acuity ◽  
Visual Outcomes ◽  
Group A ◽  
Group B

Introduction: Collagen cross-linking is a useful adjunct in preventing corneal ectasia after laser-assisted in situ keratomileusis (LASIK). This study aimed to evaluate whether prophylactic cross-linking in IntraLase LASIK affects optimum visual outcome and recovery time in the immediate post-surgery period and is associated with any side effects. Methods: This was a retrospective case study on the right eyes of 100 Chinese subjects aged 18 to 40 years who underwent IntraLase LASIK. Fifty subjects who underwentcross-linking after completing LASIK (Group A) were compared with 50 subjects who did not undergo LASIK (Group B). Cases were evaluated for pre- and post-operative spherical equivalent, uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA), recovery time and presence of side effects. Results: At 1 week post-LASIK, mean (SD) UDVA of Group A subjects was poorer than Group B, at 1.05 (0.19) vs 1.17 (0.19) (p = 0.036); however, there was no significant difference in CDVA (p = 0.095). By 1 month post-LASIK, differences in both UDVA and CDVA were insignificant (p = 0.055, 0.106, respectively). Mean recovery time was 2.72 (95% confidence interval [CI] = 0.64-4.7) days longer in Group A (p = 0.010), although by 1 month post-LASIK, both groups were able to achieve CDVA equal to or better than that achieved pre-LASIK. Incidence of mild inflammation and dry eyes post-LASIK was similar in both groups (p = 1.00, 0.749, respectively); no other complications were observed. Conclusion: No differences in visual outcomes at and occurrence of side effects at 1 month post-LASIK were observed between subjects who underwent cross-linking prior to refractive surgery and those who did not. However, the group that underwent cross-linking had a slightly longer mean recovery time. Our study supports prophylactic cross-linking as a safe procedure that does not affect immediate visual outcomes among the Chinese population when used in adjunct with LASIK surgery.

scholarly journals Distribution of ABO and Rh blood groups in Nepalese medical students: a report

2000 ◽  
Vol 6 (1) ◽  
pp. 156-158
Author(s):  
T. Pramanik ◽  
S. Pramanik
Keyword(s):  
Medical Students ◽  
Blood Group ◽  
Blood Groups ◽  
Blood Group A ◽  
Group A ◽  
Group B ◽  
Group Distribution

The frequencies of ABO and rhesus blood groups vary from one population to another. We studied blood group distribution in 120 Nepalese students; 34% were blood group A, 29% group B, 4% group AB and 32.5% group O. The frequency of Rh-negative blood was 3.33% and Rh-positive 96.66%

scholarly journals Evaluation of changes in choroidal thickness after implantable collamer lens surgery in high myopia patients with Graves’ Ophthalmopathy (inactive phase)

2020 ◽  
Author(s):  
Fanglin He ◽  
Yan Liu ◽  
Renbing Jia ◽  
Jing zhang
Keyword(s):  
Visual Acuity ◽  
High Myopia ◽  
Choroidal Thickness ◽  
Control Group ◽  
Safety Index ◽  
Implantable Collamer Lens ◽  
Graves Ophthalmopathy ◽  
Group A ◽  
Efficacy Index ◽  
Group B

Abstract Background To evaluate the safety and effectiveness of the Visian Implantable Collamer Lens (ICL) implantation in high myopic patients with inactive Graves’ ophthalmopathy (GO) by observing the changes of choroidal thickness (CT). Methods Eight patients (16 eyes) with high myopia accompanied with inactive GO were selected as the experimental group (group A) and 18 high myopic patients (36 eyes) without GO were selected as a control group (group B). The outcomes of uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BCVA), safety index, efficacy index, intraocular pressure (IOP), vault, corneal endothelial count, and choroidal thickness (CT) were observed. The values of CT were measured using swept-source optical coherence tomography (SS-OCT) scans. Results The UCVA and BCVA in all operated eyes were better than that before surgery. The postoperative safety index and efficacy index were 1.23 and 1.19 in the group A, respectively, and 1.26 and 1.21 in the group B, respectively. In both groups, foveal CT increased significantly in high myopic patients at 2 hours and at 3 months after surgery, compared to preoperative values. The same tendencies were observed in the inner nasal and outer nasal regions. Compared with patients without GO, the increase of CT was more obvious in GO patients, 2 hours postoperatively (P = 0.006) and 3 months postoperatively (P = 0.011). Conclusions The ICL implantation is safe and effective in high myopic patients with inactive GO. Subfoveal and nasal CT may be useful parameters for monitoring the activity of GO patients.

scholarly journals The Impact of Unilateral or Bilateral Cataract Surgery on Visual Acuity and Life Quality of Elderly Patients

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Lei Zuo ◽  
Haidong Zou ◽  
Xinfeng Fei ◽  
Weiqi Xu ◽  
Jianhong Zhang
Keyword(s):  
Visual Acuity ◽  
Elderly Patients ◽  
Cataract Surgery ◽  
Life Quality ◽  
Weighted Average ◽  
Bilateral Cataract ◽  
Surgical Methods ◽  
Group A ◽  
Group B ◽  
The Impact

In the current study, the CLVQOL was used to assess VRQOL before unilateral or bilateral cataract surgery and at the end of the follow-up period in order to determine the greater beneficial mode of surgery for patients, if one of the two surgical methods is more beneficial over the other. The patients were classified as receiving unilateral (group A) and bilateral cataract surgery (group B). There were no significant differences between groups A and B before the operation in terms of life quality scores, binocular weighted average LogMAR BCVA, age, educational level, gender, systematic and ocular comorbidities, and the complications of the operation. It was shown that visual acuity improved more significantly with bilateral cataract surgery than with unilateral surgery in elderly patients with a high preoperative disease burden in Shanghai city. However, the improvement in life quality was not different in patients receiving either bilateral or unilateral cataract surgery.

scholarly journals Small Incision Cataract Surgery (SICS) with Clear Corneal Incision and SICS with Scleral Incision – A Comparative Study

2014 ◽  
Vol 2 (1) ◽  
pp. 22-27
Author(s):  
Md Shafiqul Alam ◽  
Khaleda Nazneen Bari
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Visual Outcome ◽  
Small Incision Cataract Surgery ◽  
Corneal Incision ◽  
Clear Corneal Incision ◽  
Age Related ◽  
Postoperative Astigmatism ◽  
Group A ◽  
Group B

Background: Age related cataract is the leading cause of blindness and visual impairment throughout the world. With the advent of microsurgical facilities simple cataract extraction surgery has been replaced by small incision cataract surgery (SICS) with posterior chamber intra ocular lens implant, which can be done either with clear corneal incision or scleral incision. Objective: To compare the post operative visual outcome in these two procedures of cataract surgery. Materials and method: This comparative study was carried out in the department of Ophthalmology, Delta Medical College & Hospital, Dhaka, Bangladesh, during the period of January 2010 to December 2012. Total 60 subjects indicated for age related cataract surgery irrespective of sex with the age range of 40-80 years with predefined inclusion and exclusion criteria were enrolled in the study. Subjects were randomly and equally distributed in 2 groups; Group A for SICS with clear corneal incision and group B for SICS with scleral incision. Post operative visual out come was evaluated by determining visual acuity and astigmatism in different occasions and was compared between groups. Statistical analysis was done by SPSS for windows version12. Results: The highest age incidence (43.3%) was found between 61 to 70 years of age group. Among study subjects 40 were male and 20 were female. Preoperative visual acuity and astigmatism were evenly distributed between groups. Regarding postoperative unaided visual outcome, 6/12 or better visual acuity was found in 19.98% cases in group A and 39.6% cases in group B at 1st week. At 6th week 6/6 vision was found in 36.3% in Group A and 56.1% in Group B and 46.2% in group A and 66% in group B without and with correction respectively. With refractive correction, 6/6 vision was attained in 60% subjects of group A and 86.67% of group B at 8th week. Post operative visual acuity was statistically significant in all occasions. Postoperative astigmatism of >0.50D was in 82.5% subjects of group A and 52.8% subjects of group B at 1st week. At 6th week postoperative astigmatism of less than 1D was in 79.95% subjects of Group A and 83.34% subjects of Group B. About 20% subjects in Group A and only 3.3% in Group B showed astigmatism of more than 1D and these differences on both the occasions were statistically significant. Conclusion: The post operative visual outcome was better in SICS with scleral incision (group B) than in SICS with clear corneal incision (Group-A). DOI: http://dx.doi.org/10.3329/dmcj.v2i1.17793 Delta Med Col J. Jan 2014; 2(1): 22-27

scholarly journals Comparisons of Visual and Surgical Outcomes after Reuse or Replacement of Dislocated in-the-Bag Intraocular Lens

2018 ◽  
Vol 2018 ◽  
pp. 1-4 ◽  
Author(s):  
Takayuki Baba ◽  
Tomohiro Nizawa ◽  
Toshiyuki Oshitari ◽  
Shuichi Yamamoto
Keyword(s):  
Visual Acuity ◽  
Endothelial Cell ◽  
Intraocular Lens ◽  
Refractive Error ◽  
Surgical Outcomes ◽  
Case Series ◽  
Cell Loss ◽  
Significant Difference ◽  
Group A ◽  
Group B

Purpose. To compare the visual and surgical outcomes after a reuse or a replacement of a dislocated in-the-bag intraocular lens (IOL). Methods. This was a retrospective, nonrandomized case series at a single ophthalmological institution. Cases with an in-the-bag dislocation of an IOL were treated by pars plana vitrectomy and the reuse or the replacement of the IOL. The lens was held by intrascleral fixation of the haptics of the IOL under both conditions. The same dislocated IOL was reused in 6 eyes (group A) or it was replaced with another IOL in the other 9 eyes (group B). The pre- and postoperative parameters analyzed included the visual acuity, refractive error, corneal endothelial cell density, and intraocular pressure (IOP). Results. There was no significant difference between the two groups in the postoperative visual acuity (P=0.388), refractive error (P=0.955), IOP (P=0.529), and endothelial cell loss (P=0.940). A breakage or a tilting of the IOL was observed and required replacement in three eyes in the reuse group (P=0.044). Conclusions. Half of the cases with reused in-the-bag dislocated IOL had a breakage or a tilting of the IOL. The replacement of the in-the-bag dislocated IOL is better than the reuse of the IOL with intrascleral haptics fixation.

scholarly journals Cross-sectional study among medical students in Latvia: Differences of mental symptoms and somatic symptoms among Latvian and international students

2018 ◽  
Vol 27 (1) ◽  
pp. 47-54
Author(s):  
Kamiar-Kersten Rueckert ◽  
Gunta Ancane
Keyword(s):  
International Students ◽  
Medical Students ◽  
Stressful Life Events ◽  
Stressful Life Event ◽  
Somatic Symptoms ◽  
Adjustment Disorder ◽  
Stressful Life ◽  
Cross Sectional ◽  
Group A ◽  
Group B

Introduction. This research aims to determine the prevalence of mental symptoms (depressive symptoms, anxiety and adjustment disorders) and somatic symptoms among medical students at Riga Stradins University in Latvia, as well as to display the differences between local and international medical students. Methods. A cross-sectional study was conducted by means of onlinebased questionnaires among medical students in their 1st, 4th and 6th years studying in Riga, Latvia, during March 2017. The mental and somatic symptoms were screened with the PHQ-D Option C (PHQ-15, PHQ-9, GAD-7). Symptoms of adjustment disorder were obtained by the ADNM-6. Medical students were divided into three groups according to their answers of the PHQ-D: Group A: no symptom, group B: a single symptom, group C: multiple symptoms. A general questionnaire and a questionnaire regarding stressful life events over the past half-year were distributed additionally. Results. 67 (40.1%) participants were Latvian students; 100 (59.9%) were international students. 23 (34.3%) Latvian students were in group A, 20 (29.9%) in group B, 24 (35.8%) in group C. 51 (51%) international students were in group A, 34 (34%) in group B, 14 (14%) in group C. Latvians displayed statisti cally significantly more health-related symptoms (0.003). 11 (11%) international students who reported a stressful life event over the last half-year were in group C. 21 (31.3%) of Latvian students who reported a stressful life event over the last half-year were in group C. 73 (43.7%) of all students had experienced stressful life events and displayed troubles adjusting to them. 65 (63.1%) students of the two groups with a stressful life found the event to have a great burden on them, 63 (61.2%) were wondering whether it could happen again, and 73 (70.9%) tried to suppress their feelings. Conclusion. Medical students in Latvia have a high prevalence of healthrelated symptoms. Latvian medical students display more health-related symptoms and symptoms of adjustment disorder. Further research needs to be performed to investigate whether Latvians have a lower threshold for stressors or whether they are exposed to more stressors than international students. The high prevalence of symptoms of adjustment disorder may impact the prospective patient-doctor relationship and the treatment outcome.

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