Retinal and Choroidal Thickness in Children with a History of Retinopathy of Prematurity and Transscleral Diode Laser Treatment

2016 ◽  
Vol 27 (2) ◽  
pp. 190-195 ◽  
Author(s):  
Isıl Sayman Muslubas ◽  
Murat Karacorlu ◽  
Mumin Hocaoglu ◽  
Serra Arf ◽  
Hakan Ozdemir
Keyword(s):  
Visual Acuity ◽  
Diode Laser ◽  
Retinopathy Of Prematurity ◽  
Choroidal Thickness ◽  
History Of ◽  
Group 3 ◽  
Laser Group ◽  
Group 2 ◽  
Sd Oct ◽  
Group 1

Purpose To evaluate the outcomes of transscleral diode laser photocoagulation in the eyes of children with a history of threshold retinopathy of prematurity (ROP) and compare them with the eyes of children with no or subthreshold ROP and normal term infants by spectral-domain optical coherence tomography (SD-OCT). Methods Three groups of children aged 4 to 10 years were included as follows: 45 patients with regressed ROP who had not received any treatment (group 1), 48 patients with a history of zone 2 threshold ROP who had been treated with transscleral diode laser (group 2), and 56 age-matched healthy full-term children (group 3). Visual acuity, refractive error, and measurement of retinal and choroidal thickness by SD-OCT were compared between groups retrospectively. Results The mean gestational age (GA) and birthweight (BW) were 31 weeks and 1,409 grams in group 1, 28.7 weeks and 1,274.5 grams in group 2, and 38.4 weeks and 3,285 grams in group 3, respectively. There were 6 significant differences in the laser group: GA, BW, macular thickness, foveal depression, spherical equivalent, and visual acuity. In contrast, there were no significant differences among any of the choroidal parameters in all of the groups. Neither macular nor choroidal thickness correlated with visual acuity. Conclusions Although retinal structural changes were observed in patients with a history of ROP, especially in patients treated with laser, no significant difference was found in choroidal thickness between groups. These structural abnormalities may be related to both severity of ROP and laser treatment.

scholarly journals The Threshold of Admission Glycemia as a Predictor of Adverse Events in Diabetic and Non-Diabetic Patients with Acute Coronary Syndrome

2009 ◽  
Vol 3 ◽  
pp. CMC.S2289 ◽  
Author(s):  
Taysir S. Garadah ◽  
Salah Kassab ◽  
Qasim M. Al-Shboul ◽  
Abdulhai Alawadi
Keyword(s):  
Acute Coronary Syndrome ◽  
Adverse Events ◽  
Diabetic Patients ◽  
Stress Hyperglycemia ◽  
Coronary Syndrome ◽  
History Of ◽  
Group 3 ◽  
Group 2 ◽  
High Level ◽  
Group 1

Recent studies indicated a high prevalence of hyperglycemia in non-diabetic patients presenting with acute coronary syndrome (ACS). However, the threshold of admission glucose (AG) as a predictor of adverse events in ACS is unclear. Objective The aim of this study was to assess the threshold of admission glucose (AG) as a predictor of adverse events including Major Acute Cardiac Events (MACE) and mortality, during the first week of admitting patients presenting with ACS. Material and Methods The data of 551 patients with ACS were extracted and evaluated. Patients were stratified according to their blood glucose on admission into three groups: group 1: <7 mmol/L (n = 200, 36.3%) and group 2: >7 mmol/L and <15 mmol/L (n = 178, 32.3%) and group 3: ≥15 mmol/L (n = 173, 31.4%). Stress hyperglycemia was arbitrarily defined as AG levels > 7 mmol/L (group 2 and 3). Patients with ACS were sub-divided into two groups: patients with unstable angina (UA, n = 285) and those with ST segment elevation myocardial Infarction (STEMI, n = 266) and data were analyzed separately using multiple regression analysis. Results The mean age of patients was 59.7 ± 14.8 years and 63% were males. The overall mortality in the population was 8.5% (5.4% in STEMI and 3.1% in UA) patients. In STEMI patients, the odds ratio of stress hyperglycemia as predictor of mortality in group 3 compared with group 1 was 3.3 (CI 0.99-10.98, P < 0.05), while in group 2 compared with group 1 was 2.4 (CI: 0.75-8.07, P = 0.065) after adjustment for age and sex. Similarly, in UA patients, the odds ratio of stress hyperglycemia in group 3 compared with group 1 was 2.7 (CI 0.37-18.98, P < 0.05), while in group 2 compared with group 1 was 2.4 (CI: 0.4-15.2, P = 0.344) after adjustment for age and sex. The incidence of more than 2 MACE in both STEMI and UA patients was higher in group 3 compared with the other two groups. Regression analysis showed that history of DM, high level of LDL cholesterol, high level of HbA1c, and anterior infarction were significant predictors of adverse events while other risk factors such as BMI, history of hypertension and smoking were of no significance. Conclusion This study indicates that the stress hyperglycemia on admission is a powerful predictor of increased major adverse events and hospital mortality in patients with acute coronary syndrome.

Abstract WP380: Thyrotoxicosis is Associated With Worse In-Hospital Mortality in Patients With Ischemic Stroke

Stroke ◽  
2020 ◽  
Vol 51 (Suppl_1) ◽  
Author(s):  
Sakiru O Isa ◽  
Olajide Buhari ◽  
Hameem Changezi
Keyword(s):  
Ischemic Stroke ◽  
Hospital Mortality ◽  
Length Of Hospital Stay ◽  
The Body ◽  
Significant Difference ◽  
History Of ◽  
Group 3 ◽  
Group 2 ◽  
Time Of Presentation ◽  
Group 1

Introduction: Hyperthyroidism increases the basal metabolic rate and affects most systems in the body. Patients with hyperthyroidism have been shown to have a higher incidence of ischemic stroke. There is a paucity of information regarding its effects on the short-term outcomes of patients admitted with ischemic stroke. Hypothesis: Hyperthyroidism is associated with worse in-hospital outcomes in patients admitted for ischemic stroke. Methods: We queried the National Inpatient Sample to identify adult patients(aged 18 and above) admitted for ischemic stroke between January 2011 and December 2014. We compared those with a history of hyperthyroidism (group 1) and thyrotoxicosis on admission (group 2) with the rest of the patients (group 3). The main outcome was in-hospital mortality. Secondary outcomes included the length of hospital stay and cost of hospitalization. We used the logistic regression model and adjusted for baseline characteristics and co-morbidities. Results: There were 643,786 patients in the study, 0.44% had a history of hyperthyroidism, and 0.01% had thyrotoxicosis at the time of presentation. The odd of mortality in group 1 compared to group 3 was 0.89, 95% CI 0.75-1.05, p=0.16 while in group 2 compared to group 3, it was 2.42, 95% CI 1.29-4.52, p<0.006. The mean length of stay was also longer in group 2 with a mean difference of 8.06, 95% CI 4.74 - 11.39, p<0.0001. Conclusion: From the study, there was no significant difference in in-hospital mortality between patients with previously diagnosed hyperthyroidism and those without diagnosed hyperthyroidism. Patients who had thyrotoxicosis on admission, on the other hand, had worse outcomes compared to patients without thyrotoxicosis.

Prophylactic Use of a Combination of an Anticoagulant and Ursodeoxycholic Acid for Sinusoidal Obstruction Syndrome after Allogeneic Myeloablative Hematopoietic Stem Cell Transplantation

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 5755-5755
Author(s):  
Hiroshi Okamura ◽  
Mitsutaka Nishimoto ◽  
Takahiko Nakane ◽  
Hideo Koh ◽  
Yasuhiro Nakashima ◽  
...  
Keyword(s):  
Risk Factors ◽  
Research Funding ◽  
Gemtuzumab Ozogamicin ◽  
Adult Patients ◽  
Allogeneic Hsct ◽  
History Of ◽  
Group 3 ◽  
Group 2 ◽  
Prophylactic Use ◽  
Group 1

Abstract Introduction: Sinusoidal obstruction syndrome (SOS) is one of the potentially fatal complications of hematopoietic stem cell transplantation (HSCT). In particular, severe SOS frequently leads to multiple organ failure, and a worse prognosis. Thus, prophylaxis against development of SOS could contribute improved survival after HSCT. Previous reports demonstrated the effectiveness of the prophylactic use of ursodeoxycholic acid (UDCA) or certain anticoagulants, including unfractionated and low-molecular-weight heparin, for SOS. In two randomized controlled trials and two meta-analyses it was reported that UDCA, a hydrophilic bile acid, was an effective and safe drug for prophylaxis against SOS. The usefulness and feasibility of prophylactic use of anticoagulants after allogeneic HSCT are however still controversial. In addition, to our knowledge no study has evaluated the feasibility of usage of UDCA combined with an anticoagulant for SOS prevention after allogeneic HSCT in adult patients. To assess the efficacy and safety of use of UDCA combined with an anticoagulant as SOS prophylaxis, we performed a retrospective cohort study to examine the occurrences of SOS and hemorrhagic events in patients who underwent myeloablative allogeneic HSCT at our institution. We examined use of any anticoagulant together with simultaneous administration of UDCA, in comparison with UDCA alone for the prevention of SOS. Patients and methods: We reviewed the charts of consecutive adult patients in whom myeloablative allogeneic HSCT was performed at our hospital from November 1994 to May 2014, and who received either unfractionated heparin or dalteparin (low-molecular-weight heparin) with UDCA (group 1), danaparoid with UDCA (group 2), or UDCA only (group 3), used for prophylaxis against SOS. Results: A total of 280 patients (group 1: n=52; group 2: n=33; and group 3: n=195) were investigated. The proportions of patients with risk factors for SOS-including non-remission at the time of HSCT, a second or subsequent HSCT, high aspartate aminotransferase (AST) levels before HSCT, high ferritin levels before HSCT, a history of receiving gemtuzumab ozogamicin, and HLA disparity-were similar across the three groups. In group 1, a conditioning regimen containing busulfan was used less frequently (P = 0.002). SOS occurred in seven patients (13.7%) in group 1, five patients (15.2%) in group 2, and 28 patients (14.4%) in group 3, all meeting the Seattle criteria. None of the patients in group 1, two (6.1%) in group 2, and nine (4.6%) in group 3 had SOS diagnosed according to the Baltimore criteria. There was no significant difference in the incidence of SOS among the three groups. In addition, with regard to the cumulative incidence of severe SOS, no statistically significant difference was present among the three groups. The incidence of hemorrhagic events within 30 and 100 days following allogeneic HSCT was not significantly different across the three groups (30 days; 5.8%, 3.0%, 5.1%, P = 0.843, 100 days; 17.6%, 15.2%, 14.4%, P=0.843, respectively). Furthermore, the probabilities of OS and NRM until day 100 after allogeneic HSCT were similar among the three groups (P = 0.733 and P = 0.637, respectively). In a univariate model, a history of gemtuzumab ozogamicin treatment, high serum ferritin levels before HSCT, an HLA mismatched donor, and non-complete remission of disease at the time of allogeneic HSCT were found to be significant risk factors for SOS. Multivariate analysis revealed that a history of gemtuzumab ozogamicin therapy, a mismatched HLA donor, and non-complete remission of disease at the time of allogeneic HSCT were significant and independent risk factors for SOS. In the multivariate as well as univariate analyses, combined administration of UDCA and any anticoagulant for SOS prophylaxis did not have a significant effect on the incidence SOS, when compared to prophylaxis with UDCA alone. Conclusion: Our study results suggest that the combined use of UDCA and an anticoagulant for SOS prophylaxis after myeloablative allogeneic HSCT in adult patients was not beneficial. Establishment of an optimal strategy for prophylaxis against SOS after HSCT is still needed. Disclosures Nakane: Mundipharma KK: Research Funding. Koh:Pfizer: Consultancy, Honoraria. Hino:Pfizer: Honoraria, Research Funding; Nippon Shinyaku: Honoraria, Speakers Bureau; Alexion: Honoraria, Research Funding. Nakamae:Mochida Pharmaceutical Co., Ltd.: Honoraria, Research Funding; Pfizer: Consultancy, Honoraria; Novartis Pharma KK: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: travel/accommodation/meeting expenses, Research Funding.

scholarly journals Association of Haemoglobin and C-Reactive Protein level with Different Risk Factors among Acute Coronary Syndrome Patients

2019 ◽  
Vol 5 (2) ◽  
pp. 156-160
Author(s):  
Md Mahboob Morshed ◽  
Md Joynul Islam ◽  
ATM Ashadullah ◽  
Khondker Shaheed Hussain ◽  
Mohammad Ahtashamul Haque
Keyword(s):  
Risk Factors ◽  
Acute Coronary Syndrome ◽  
Reactive Protein ◽  
Coronary Syndrome ◽  
Group 4 ◽  
History Of ◽  
Study Population ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Background: Different risk factors may be related with the haemoglobin and CRP level among the acute coronary syndrome patients. Objective: The purpose of the present study was to see the association of haemoglobin and CRP level with different type of risk factors among the acute coronary syndrome patients. Methodology: This cross-sectional study was conducted in the Department of Cardiology at Mymensingh Medical College, Mymensingh, Bangladesh from December 2010 to November 2011 for a period of two (02) years. Patients of ACS who were presented within 12 hours of chest pain were included as study population. Study population were categorized in four groups according to the level of hemoglobin and C-reactive protein. Age, cardiovascular risks factor, history, family history of cardiovascular disease, treatment history and ECG were taken during admission. Blood sample was collected for baseline laboratory investigations like Troponin-I, Random Blood Sugar (RBS), Blood urea, Serum creatinine, lipid profile, Hemoglobin & CRP level. Sample were then send to standard laboratory/Biochemistry department of MMCH. Result: The mean age of the population was 52.18±8.88 years. Smoking was the highest percentage in Group 1 which was 54(50.0%) cases (P=0.001). Hypertension was found most common in group 1 (47.6%), Group 2 (33.3%), Group 3 (10.7%) and Group 4 (8.3%). Smoking (p=0.001) and hypertension (p=0.016) was found statistically significant. Diabetes was found in Group 1 (37.7%), Group 2 (43.5%), Group 3 (11.6%) and Group 4 (7.2%). Group 1 (50%) and Group 2 (50%) patients were dyslipidaemic. Family history of IHD was present group-1 (36.8%), Group 2 (44.7%), Group 3 (73.2%) and Group 4 (53%). Among the smoker patient 65.6% cases had CRP level ˃12 mg/l; 39.8% cases had CRP level ˂12mg/L. Among the nonsmoker 34.4% cases had CRP level ˃12mg/l and 60.2% cases had CRP level ˂12mg/L. The finding was statistically significant. Conclusion: In conclusion haemoglobin and CRP level is associated with different type of risk factors among the acute coronary syndrome patients. Journal of National Institute of Neurosciences Bangladesh, 2019;5(2): 156-160

Oral tranexamic acid for an additional 24 hours postoperatively versus a single preoperative intravenous dose for reducing blood loss in total knee arthroplasty: results of a randomized controlled trial (TRAC-24)

2021 ◽  
Vol 103-B (10) ◽  
pp. 1595-1603
Author(s):  
Paul Magill ◽  
Janet C. Hill ◽  
Leeann Bryce ◽  
Una Martin ◽  
Al Dorman ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Randomized Controlled Trial ◽  
Blood Loss ◽  
Controlled Trial ◽  
Randomized Controlled ◽  
History Of ◽  
Total Knee ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Aims In total knee arthroplasty (TKA), blood loss continues internally after surgery is complete. Typically, the total loss over 48 postoperative hours can be around 1,300 ml, with most occurring within the first 24 hours. We hypothesize that the full potential of tranexamic acid (TXA) to decrease TKA blood loss has not yet been harnessed because it is rarely used beyond the intraoperative period, and is usually withheld from ‘high-risk’ patients with a history of thromboembolic, cardiovascular, or cerebrovascular disease, a patient group who would benefit greatly from a reduced blood loss. Methods TRAC-24 was a prospective, phase IV, single-centre, open label, parallel group, randomized controlled trial on patients undergoing TKA, including those labelled as high-risk. The primary outcome was indirect calculated blood loss (IBL) at 48 hours. Group 1 received 1 g intravenous (IV) TXA at the time of surgery and an additional 24-hour postoperative oral regime of four 1 g doses, while Group 2 only received the intraoperative dose and Group 3 did not receive any TXA. Results Between July 2016 and July 2018, 552 patients were randomized to either Group 1 (n = 241), Group 2 (n = 243), or Group 3 (n = 68), and 551 were included in the final analysis. The blood loss did differ significantly between the two intervention groups (733.5 ml (SD 384.0) for Group 1 and 859.2 ml (SD 363.6 ml) for Group 2; mean difference -125.8 ml (95% confidence interval -194.0 to -57.5; p < 0.001). No differences in mortality or thromboembolic events were observed in any group. Conclusion These data support the hypothesis that in TKA, a TXA regime consisting of IV 1 g perioperatively and four oral 1 g doses over 24 hours postoperatively significantly reduces blood loss beyond that achieved with a single IV 1 g perioperative dose alone. TXA appears safe in patients with history of thromboembolic, cardiovascular, and cerebrovascular disease. Cite this article: Bone Joint J 2021;103-B(10):1595–1603.

Suicide Attempt History, Self-Esteem, and Suicide Risk in a Sample of 116 Depressed Voluntary Inpatients

2004 ◽  
Vol 95 (3_suppl) ◽  
pp. 1092-1094 ◽  
Author(s):  
Charles James Palmer
Keyword(s):  
Suicidal Ideation ◽  
Suicide Attempt ◽  
Suicide Risk ◽  
Suicide Ideation ◽  
Self Esteem ◽  
Significant Difference ◽  
History Of ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

116 consecutively admitted depressed inpatients were divided into three groups based on self-reported history of suicidal ideation and history of suicide attempt. Participants in Group 1 ( M age 34.0, SD = 14.0), 13 men and 24 women, reported no history of suicidal ideation or history of suicide attempt. Group 2 ( M age 34.0, SD = 8.6), 14 men and 25 women, reported having a history of suicidal ideation but no history of suicide attempt. Group 3 ( M age 34.0 yr., SD = 6.3), 14 men and 26 women, reported a history of suicidal ideation and at least one suicide attempt. Each participant completed the Suicide Risk Scale and the Self-esteem Scale. Analysis of variance with Tukey post hoc comparisons yielded a significant difference between Groups 1 and 2, between Groups 1 and 3, and between Groups 2 and 3 on the Suicide Risk Scale. There was a significant difference between Group 1 and Group 2 and between Group 1 and Group 3 on the Self-esteem Scale. These data indicated that suicide ideation and suicide attempt history significantly elevated suicide risk. Self-esteem was significantly decreased by suicide ideation and suicide attempt history.

Refractive Error in Patients with Retinopathy of Prematurity after Laser Photocoagulation or Bevacizumab Monotherapy

2015 ◽  
Vol 234 (4) ◽  
pp. 211-217 ◽  
Author(s):  
Hsi-Kung Kuo ◽  
I-Ting Sun ◽  
Mei-Yung Chung ◽  
Yi-Hao Chen
Keyword(s):  
Refractive Error ◽  
Retinopathy Of Prematurity ◽  
Laser Photocoagulation ◽  
Group 4 ◽  
Group 3 ◽  
The Mean ◽  
Group 2 ◽  
Type 1 Rop ◽  
Group 1

Purpose: To evaluate the refractive development of premature infants with retinopathy of prematurity (ROP) after treatment with laser photocoagulation or intravitreal injection of bevacizumab (IVB). Methods: The medical records of patients with ROP treated between 2003 and 2012 who underwent yearly follow-ups were retrospectively reviewed. Patients with residual ROP abnormalities were excluded. The cycloplegic refraction at 3 years of age, assessed using an autorefractometer, was recorded. Results: In total, 54 eyes from 54 patients were enrolled. Patients were divided into 4 groups: group 1, including 14 eyes of 14 patients treated with laser therapy; group 2, 15 eyes of 15 patients treated with IVB; group 3, 13 eyes of 13 patients with non-type 1 ROP under conservative follow-up, and group 4, 12 eyes of 12 premature patients without ROP. The mean spherical equivalent at 3 years of age was -1.71 ± 1.27 dpt in group 1, -1.53 ± 2.20 dpt in group 2, 0.63 ± 1.37 dpt in group 3, and 0.41 ± 1.95 dpt in group 4. The mean refractive error differed significantly among the 4 groups (p < 0.001). Patients in groups 1 and 2 were more prone to myopia compared with those in groups 3 and 4. Furthermore, patients with type 1 ROP treated by laser photocoagulation (group 1) and those treated by IVB (group 2) had similar refraction (p = 1). Conclusions: The results of this study suggest that treatment-demanding ROP eyes are susceptible to more severe myopia with age compared with eyes without ROP or those with spontaneously regressed ROP. In addition, the myopic status between laser and IVB treatment did not differ statistically.

Long-term macular vascular density measured by OCT-A in children with retinopathy of prematurity with and without need of laser treatment

2020 ◽  
pp. 112067212098320
Author(s):  
Ana Rita Carreira ◽  
João Cardoso ◽  
Diogo Lopes ◽  
Tomás Loureiro ◽  
Audrey Sampaio ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Laser Treatment ◽  
Retinopathy Of Prematurity ◽  
Vascular Density ◽  
Preterm Children ◽  
Corrected Visual Acuity ◽  
Group 2 ◽  
Best Corrected Visual Acuity ◽  
Group 1

Purpose: To assess long-term vascular density measured by optical coherence tomography angiography (OCT-A) in former preterm children with history of retinopathy of prematurity (ROP) with and without need of laser treatment. Methods: This observational study included former preterm children that developed ROP stage 2 or 3. Infants were divided in two groups according to previous need of laser treatment, and underwent a complete ophthalmologic evaluation, including assessment of macular morphologic and vascular parameters by OCT-A. Results: Fifteen eyes were included in group 1 (laser-requiring ROP) and 19 in group 2 (non-treated ROP). Group 1 had lower mean gestational age and birth weight values than group 2 ( p < 0.001 and p < 0.001, respectively). Best corrected visual acuity (BCVA) was lower in group 1 (0.08 ± 0.04 logMAR vs 0.04 ± 0.07 logMAR, p = 0.03). Laser-requiring ROP had lower vascular parameters, especially of central and internal vascular density (9.15 ± 2.75 vs 10.52 ± 0.86 mm−1, p = 0.05; 13.74 ± 1.00 vs 15.86 ± 0.64 mm−1, p = 0.05; respectively), and lower avascular zone circularity (0.58 ± 0.06 vs 0.76 ± 0.02, p < 0.001). Mean macular thickness was higher in group 1 (300.50 ± 10.50 vs 281.11 ± 2.50 μm, p = 0.05). Best corrected visual acuity (BCVA) was correlated with superficial vascular density ( p < 0.05). Conclusion: Laser-requiring ROP seems to result in a decrease of long-term BCVA, which is at least partially attributed to a decrease in superficial macular vascular density. However, prematurity degree was more pronounced in children that required treatment, which might have influenced our results.

scholarly journals Detection of platelet-directed immunoglobin G in sera using the peroxidase-anti-peroxidase (PAP) slide technique

Blood ◽  
1980 ◽  
Vol 55 (2) ◽  
pp. 299-303
Author(s):  
GM Schmidt ◽  
KJ Bross ◽  
KG Blume ◽  
N Enders ◽  
S Santos ◽  
...  
Keyword(s):  
Antibody Activity ◽  
Immunofluorescence Technique ◽  
Indirect Immunofluorescence Technique ◽  
History Of ◽  
Group 3 ◽  
Group 2 ◽  
Peroxidase Technique ◽  
Normal Males ◽  
Slide Technique ◽  
Group 1

An immunohistochemical procedure for the detection of immunoglobulin G adherent to platelets is described. The peroxidase anti-peroxidase method is used to detect antibody activity directed against platelets from normal donors in the sera from 305 individuals. These subjects were divided into three groups: group 1, patients referred for tissue typing; group 2, healthy normal females; group 3, healthy normal males. In group 1, 28% of the sera were found to be positive; in most of these a history of prior transfusions was obtained. In group 2, 7.4% were found to be positive, most having previous pregnancies. Only 1% were found to be positive in group 3, and no reason for presensitization was found. Results from the indirect immunofluorescence technique served as a control and as a means to compare the sensitivity. Under the conditions chosen, the peroxidase anti-peroxidase test was two to eight times more sensitive than the immunofluorescence technique. Specificity of the peroxidase anti-peroxidase technique was demonstrated using a monospecific anti-PLA1 antiserum. It is concluded that the peroxidase anti-peroxidase slide technique may be a useful tool in the study of platelet-related immunophenomena.

scholarly journals Effect of Three Wavelengths of Diode Laser on the Efficacy of Bleaching of Stained Teeth

2020 ◽  
Author(s):  
Reza Saeedi ◽  
Ladan Ranjbar Omrani ◽  
Mahdi Abbasi ◽  
Nasim Chiniforush ◽  
Mojgan Kargar
Keyword(s):  
Diode Laser ◽  
Tooth Bleaching ◽  
Color Parameters ◽  
Group 4 ◽  
Before And After ◽  
Group 3 ◽  
Group 2 ◽  
Laser Bleaching ◽  
Group 1

Objectives: Light irradiation and heat have been used to accelerate the process of tooth bleaching. This study aimed to assess the efficacy of conventional bleaching compared to laser-bleaching using three different wavelengths of diode lasers. Materials and Methods: In this in-vitro experimental study, 40 extracted human central incisors were immersed in a coloring solution made of tea, coffee, and cola for 21 days. The L*, a*, and b* color parameters were measured before and after the immersion using spectrophotometry. The teeth were then randomly divided into four groups (n=10) as follows: group 1: 810-nm diode laser + Biolase Laser White 20, group 2: 940-nm diode laser + Biolase Laser White 20, group 3: 980-nm diode laser + Biolase Laser White 20, and group 4: conventional bleaching with Opalescence Boost without laser irradiation. One-way analysis of variance (ANOVA) was used to assess the effect of laser type and bleaching technique on color parameters. Results: The 940-nm (∆E=28.5896) and 810-nm laser groups (∆E=21.2382) showed the highest and the lowest bleaching efficacy, respectively; however, the groups were not significantly different in terms of bleaching efficacy (P>0.05). Conclusion: Laser-bleaching with 810-, 940- and 980-nm wavelengths of diode laser has an efficacy similar to that of conventional bleaching but in a shorter period. No difference was noted between different laser wavelengths in terms of bleaching efficacy.

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