Flap Creation Research Articles

Femtosecond-Assisted Laser in situ Keratomileusis with de novo Flap Creation Following Previous Microkeratome Laser in situ Keratomileusis [Response to Letter

Femtosecond-Assisted Laser in situ Keratomileusis with de novo Flap Creation Following Previous Microkeratome Laser in situ Keratomileusis [Response to Letter

FIL-SSF Carlevale intraocular lens for sutureless scleral fixation: 7 recommendations from a serie of 72 cases. MICA study (Multicentric Study of the Carlevale IOL)

Lacking a standard technique, the surgical management of aphakia without capsular support remains to be optimized. The goal of this study is to analyze results for the Carlevale FIL-SSF intraocular lens and propose surgical recommendations. The P1.5 Collective performed a retrospective analysis, with a minimum follow-up of 6 months, of the records of 72 implantations of the Carlevale FIL-SSF intraocular lens, specifically designed for sutureless scleral fixation in the ciliary sulcus. The most common indication was exchange of a posterior chamber intraocular lens (70.8%). The surgery lasted a mean of 53.4minutes due to the creation of scleral flaps. The implant was damaged in 12.5% of cases. Visual acuity was improved in 83.3% of cases. The postoperative spherical equivalent was -0.3 diopters, with no change in corneal astigmatism. The implant was centered and stable in all cases. Two cases (2.8%) of cystoid macular edema were observed and resolved over six months. A number of advantages of the Carlevale FIL-SSF intraocular lens make it a safe and effective solution for correction of aphakia in the absence of capsular support. It requires a longer than usual surgical procedure, and the implant must be handled with care. From their experience, the authors propose 7 recommendations to accelerate the learning curve. In light of the results of this study, we propose the Carlevale FIL-SSF intraocular lens as the new standard for the correction of aphakia without capsular support, but other studies are necessary to determine its exact place within the heirarchy of other available techniques.

Ultrastructural Alterations of Grafted Corneal Buttons: The Anatomic Basis for Stromal Peeling Along a Natural Plane of Separation

To examine the ultrastructure of the natural plane of separation in grafted corneas and evaluate the outcomes of stromal peeling. Interventional case series. In this multicenter study, stromal peeling was attempted in 96 consecutive eyes with unsatisfactory vision following penetrating keratoplasty (PK) for keratoconus (n=79), herpetic keratitis (n=11), and granular dystrophy (n=6). Stromal exchange was performed by (1) 9 mm partial-thickness trephination; (2) creation of a corneal flap across the PK wound; (3) opening of the stromal component of the PK wound until a smooth, translucent natural plane was identified; (4) severing the attachment of the PK scar; (5) stromal peeling along the identified plane; and (6) suturing of donor lamella. Grafted corneas from cases that mandated conversion to PK were processed for transmission electron microscopy. The natural plane of separation was identified in all cases. Stromal exchange was successfully completed in 84 cases (87.5%). Snellen visual acuity ≥20/40 and ≥20/25 was reached in 93% and 72% of cases at 3 years (n=49) and 86% and 62% at 4 years (n=21) postoperatively. Mean endothelial cell loss at 1 year was 6.6% ± 9.5%. Stromal peeling occurred along a plane lined with a continuous layer of keratocytes separating pre-Descemet membrane (DM) stroma, DM, and endothelium from the anterior stroma. Pre-DM stroma was made of poorly organized lamellae containing widely spaced, randomly arranged collagen fibrils. Ultrastructural alterations in the stromal microarchitecture of grafted corneas provide evidence of a natural plane of separation identified intraoperatively. Stromal peeling can be successfully performed in post-PK eyes with various stromal pathology.

Long-term Comparison of Superior Inverted Internal Limiting Membrane Flap Creation and Internal Limiting Membrane Peeling for Macular Hole Closure

Long-term Comparison of Superior Inverted Internal Limiting Membrane Flap Creation and Internal Limiting Membrane Peeling for Macular Hole Closure

Corneal stromal roughness after VisuMax and Intralase femtosecond laser photodisruption: An atomic force microscopy study.

PurposeTo compare the induced corneal stromal bed roughness measured with atomic force microscopy (AFM) after LASIK flap creation with the IntraLase 60 kHz and the VisuMax femtosecond laser platforms.MethodsThree freshly enucleated porcine eyes were operated with each femtosecond laser in this experimental study. Standard LASIK treatment parameters were used for the experiment. After LASIK flap creation, the corneal stromal roughness was assessed using a JPK NanoWizard II® AFM in contact mode immersed in liquid. Olympus OMCL-RC800PSA commercial silicon nitride cantilever tips were used. Surface measurements were made in 10 regions of the central cornea of each sample measuring 20 x 20 microns, at 512 x 512 point resolution. Roughness was measured using the root-mean-square (RMS) value within the given regions.ResultsMeasurements from 30 regions of the 3 eyes (10 measurements per eye) in the Intralase (FS1) group, and 30 regions of the 3 eyes (10 measurements per eye) in the VisuMax (FS2) group were analyzed. There was a statistically significant difference in mean ± standard deviation RMS values between the FS1 and the FS2 groups (360 ± 120 versus 230 ± 100 nm respectively; P< 0.00001).ConclusionThis AFM study indicates that the surface of the stromal bed after LASIK flap creation is smoother in the FS2 group than the FS1 group.

Effect of suction on the posterior segment after LASIK using Femtosecond Laser vs Microkeratome

Background: Creating a successful corneal flap is the first critical step during LASIK surgery. Two techniques are used to produce corneal flaps during LASIK surgery: a microkeratome or a femtosecond laser. Femtosecond laser has a significant impact on refractive surgery by enabling non-mechanical creation of corneal flaps during laser in situ keratomileusis (LASIK). During LASIK flap creation, intraocular pressure (IOP) increases to levels exceeding 65 mm Hg. Femtosecond laser flap creation exerts less extreme IOP fluctuations but requires more procedural time than when a microkeratome is used. This study was conducted upon 60 eyes of 38 patients to evaluate the effect of applied suction during LASIK procedures on the posterior segment of myopic eyes, whether the flap was created by Microkeratome or Femtosecond laser. The study subjects were equally divided into 2 groups: group F (30 eyes of 20 patients) underwent femtosecond laser-assisted LASIK surgery and group M (30 eyes of 18 patients) underwent microkeratome-assisted LASIK surgery using Moria M2 for the treatment of myopia. It was found that the central macular thickness and RNFL thickness were not changed significantly in both groups when measured 1 week after surgery. Regarding the incidence of PVD, there was a higher incidence in group F, it was detected in 8 eyes (26.7%) compared to group M, it was detected in 1 eye (3.3%). Conclusion: Slight localized changes of macular thickness and reduction of the RNFL thickness were caused by LASIK using the two major forms of flap creation, namely a microkeratome or a femtosecond laser. Regarding the incidence of PVD, it was found that femtosecond laser-assisted LASIK using Visumax femtosecond laser had a higher incidence than that after microkeratome-assisted LASIK with the Moria M2. So the surgery of LASIK is safe and efficient, but surgeons should choose effective and safe suction mode, shorten the suction time and exclude potential retinopathy and pre-existing glaucoma before surgery to improve the safety and efficacy of LASIK.

Retrieving an Incomplete Flap With a Femtosecond Laser in the Same Sitting

PURPOSE: To report a case of a 35-year-old woman who had an incomplete flap during laser in situ keratomileusis with the Amadeus II microkeratome (Amadeus; Ziemer Ophthalmic Systems AG) in the right eye. METHODS: There was an incomplete flap in the right eye due to electric failure of the microkeratome at the beginning of flap creation. The incomplete flap was retrieved using the femtosecond laser flap creation technique in the same sitting and excimer laser ablation was performed. RESULTS: Postoperative uncorrected distance visual acuity was 20/20 in both eyes. Postoperative aberration of both eyes was not significant and there was no associated glare or halos. The patient was satisfied with the result. CONCLUSIONS: There are several reports of incomplete flap retrieved using a microkeratome, but this is the first case report in which a femtosecond laser was used to complete the flap in the same sitting. [ Journal of Refractive Surgery Case Reports. 2021;1(1):e6–e9.]

Femtosecond-Assisted Laser in situ Keratomileusis with de novo Flap Creation Following Previous Microkeratome Laser in situ Keratomileusis.

PurposeTo report the outcomes of laser in situ keratomileusis (LASIK) in patients with previous microkeratome LASIK using a femtosecond laser platform to create a de novo flap.MethodsThe charts of 17 patients that underwent femtosecond-assisted LASIK with de novo flap creation for consecutive refractive error following previous microkeratome LASIK were retrospectively reviewed at a single private practice institution. The baseline characteristics, intraoperative findings and postoperative outcomes were analyzed.ResultsAll 17 eyes underwent femtosecond-assisted LASIK with de novo flap creation without significant intraoperative or postoperative complications. Uncorrected visual acuity improved postoperatively (p<0.0001) and remained stable at 6 months follow-up. None of the subjects lost any lines of best spectacle corrected visual acuity or developed epithelial ingrowth during the postoperative period.ConclusionThe femtosecond laser technique described in this report can provide a safe and effective method to deliver LASIK following previous microkeratome LASIK. Future investigations are required to further validate the findings in this study.

Optical Coherence Tomography-Guided Femtosecond LASIK in the Setting of Corneal Scarring.

PurposeTo report the outcomes of femtosecond-assisted laser in situ keratomileusis (LASIK) in patients with previous corneal scarring using optical coherence tomography (OCT) imaging to determine flap depths.MethodsThe charts of 11 eyes of 9 patients with previous off-visual axis corneal scarring that underwent femtosecond LASIK using OCT guidance for flap depth determination were retrospectively reviewed at a single private practice institution. The baseline characteristics, intraoperative findings and postoperative outcomes were analyzed.ResultsAll 11 eyes underwent femtosecond laser flap creation and LASIK without any significant intraoperative complications. Uncorrected visual acuity improved postoperatively (p<0.0001) and remained stable at 3 months follow-up. None of the subjects lost any lines of best spectacle corrected visual acuity or developed any flap complications during the postoperative period.ConclusionThe OCT-guided femtosecond laser technique described in this report can provide a safe and effective method to deliver LASIK in the setting of previous corneal scarring. Future investigations are required to further validate the findings in this study.

Xenografts in the post-operative wound management of interpolation flaps.

Safeguarding the integrity of the donor site during the initial suspension phase of an interpolation flap is difficult. There are a variety of approaches and no consensus on post-operative management of the donor site or pedicle following the creation of the flap. The use of xenografts at the donor site of postauricular interpolation flaps simplifies post-operative wound care and prevents infection, desiccation of tissue, reduces pain, and assists with hemostasis. A porcine acellular dermal skin substitute can be utilized for the purpose of care-free interpolation flap wound care. First, the flap is designed and raised using standard surgical technique. The porcine xenograft is then sutured into the donor site and to the exposed subcutaneous side of the flap pedicle using nylon suture material. The flap then is interpolated and sutured into the surgical defect of the auricle. Silicone gel is applied to the surface of the xenograft. A pressure dressing is then placed over the surgical site. A total of 4 patients had postauricular interpolation flaps to the ipsilateral helix. All four patients had a xenograft placed at the donor site and flap pedicle at the time of the flap creation and suspension. No infections and no incidence of post-operative bleeding requiring intervention were noted. Utilizing a dermal skin substitute as a biological dressing for an interpolation flap prior to division and inset of the flap provides a useful alternative to traditional wound care during this interim period.

Measurement of the Intraocular Pressure Elevation During Laser-Assisted In Situ Keratomileusis Flap Creation Using a Femtosecond Laser Platform.

PurposeThe purpose of this study was to measure the intraocular pressure (IOP) elevation during laser assisted in situ keratomileusis (LASIK) flap creation using the WaveLight FS200 femtosecond (FS) laser platform.MethodsWe conducted an ex vivo experimental study in an animal model. The WaveLight FS200 FS laser platform was used to perform the corneal LASIK flap in freshly enucleated porcine eyes. We measured the changes in IOP from the application of the suction ring (suctioning phase) through the creation of the lamellar corneal flap (cutting phase). The IOP was recorded using a manometric technique with direct cannulation to the anterior chamber.ResultsNine freshly enucleated porcine eyes were included in the study. The mean baseline IOP before the procedure was 20.33 ± 5.9 mm Hg. The mean IOP increase over baseline IOP was 32.33 ± 11.3 mm Hg at the suctioning phase, and 38.22 ± 11.3 mm Hg at the cutting phase. The total surgical time needed to complete the procedure was 29.5 ± 4.4 seconds.ConclusionsThe WaveLight FS200 FS laser platform produces a low to moderate increase in IOP during LASIK flap creation.Translational RelevanceThe WaveLight FS200 is a safe FS laser platform because it induces a low to moderate IOP increase during LASIK flap creation.

The application of a 70° endoscope in performing transcanal middle ear surgery.

Endoscopes increase the expediency of transcanal middle ear surgery. However, the application of a 70° endoscope is limited and seldom discussed, mainly because of its large angle. We introduce our experiences with the 70° endoscope in transcanal middle ear surgery. This is a retrospective chart review of 127 patients with chronic otitis media who underwent middle ear surgery performed by the senior author in 2016 at a tertiary referral center. The types of eardrum perforation were classified as central, inferior, posterior, or anterior according to the main location of the hole. The demographics, surgical pictures, and operative records were reviewed. In 15 ears of the 127 patients, the ossicles were recognized directly by a microscope. In another 112 ears, the ossicles could not be identified under a microscope. Without elevating the tympanomeatal flap, the ossicles could be recognized in 72 of these 112 ears with endoscopes, especially the 70° endoscope. In 35 of these 112 ears, an incision to extend the drum perforation or creation of a small tympanomeatal flap in the posterior-superior canal was made to observe the ossicles. However, 5 of these 112 ears were still noted to have a narrow and/or curved ear canal and preoperatively needed to undergo endaural incisions. Among the other 122 patients who first underwent attempted transcanal surgery, 15 ears changed to endaural incisions. The drum perforations were repaired directly through the perforation in 107 ears via the transcanal route. One year after surgery, the air-bone gap closure was 16.0 ± 11.8 dB, and the graft take rate was 91.3%. With the help of a 70° endoscope, we can use the transcanal transperforation route to evaluate and reconstruct drum perforations and ossicular chains in appropriate patients. Hence, normal tissue injuries to the ear canal can be minimized.

Performance Assessment for Total Laparoscopic Hysterectomy in the Operating Room: Validity Evidence of a Procedure-specific Rating Scale

The technical conduct of total laparoscopic hysterectomy (LH) is critical to surgical outcomes. This study explored the validity evidence of an objective scale specific to the assessment of technical skills (H-OSATS) for 7 tasks of an LH with salpingo-oophorectomy procedure performed in the operating room. Observational cohort study. Two academic hospitals in Marseille and Montpellier, France. Three groups of operators (novice, intermediate, and experienced surgeons) were video recorded during their live performances of LH on a simple case. For each group, a dozen unedited videos were obtained for the following tasks: division of the round ligament, division of the infundibulopelvic ligament, creation of the bladder flap, opening of the posterior peritoneum, division of the uterine vessels, colpotomy, and closure of the vault. Two qualified raters blindly assessed each video using the H-OSATS rating scale. Inter-rater reliability and test-retest reliability were calculated as measures of internal structure. In a separate round of evaluations, the raters provided a global competent/noncompetent decision for each performance. As a measure of consequential validity, a pass/fail score was set for each task using the contrasting group method. Three tasks (creation of the bladder flap, colpotomy, and closure of the vault) displayed sound validity evidence: a meaningful total score difference among the 3 groups of experience as well as between the intermediate and experienced surgeons, reliability outcomes of >0.7, and a pass/fail score with a theoretical false-positive rate of <10%. The validity evidence of the H-OSATS rating scale differed for separate evaluations of the 7 tasks. Three tasks (i.e., creation of the bladder flap, colpotomy, and closure of the vault) revealed sound validity evidence, including at the level of the attending surgeon, whereas other tasks were more consistent with low-stakes formative evaluation standards.

Sterile Excimer Laser Shaped Allograft Corneal Inlay for Hyperopia: One-year Clinical Results in 28 Eyes

ABSTRACT Purpose: This study aimed to evaluate the one-year clinical results of an allograft corneal inlay (ACI) implantation in a case series of 28 hyperopic eyes of 16 patients. Methods: Patients with manifest refraction spherical equivalent (MRSE) between +1.00 and +6.00 D and having a cylindrical refraction of less than 1 D were included in this prospective study. The refractive powers of excimer laser-shaped ACIs were determined based on the refractive error of the individual subject’s eyes. After the creation of a femtosecond flap, the inlays were centered on the pupillary axis. Visual acuities, refractive results, and other clinical findings were reported for the 6- and 12-month follow-up exams. Results: The mean age of the patients included in the study was 36.2 ± 12.4 years (range 22–65 years). The mean pre-operative MSRE of 3.6 ± 1.51 D decreased to 0.21 ± 0.56 D (P < .001). The uncorrected distance and near visual acuity increased from 0.33 ± 0.22 and 0.17 ± 0.13 to 0.75 ± 0.22 (P < .001) and 0.72 ± 0.19 (P < .001), respectively. The corrected distance visual acuity remained unchanged (pre-OP: 0.79 ± 0.22; post-OP: 0.80 ± 0.21; P = .916), and the corrected near visual acuity increased from 0.78 ± 0.22 to 0.84 ± 0.20 (P = .003). The mean K-value and central corneal thickness increased from 42.57 ± 0.81 D and 557.5 ± 43.0 µm to 44.8 ± 1.4 D (P < .001) and 597.1 ± 58.1 µm (P < .001), respectively. No significant postoperative complications such as diffuse lamellar keratitis, epithelial ingrowth, or decentralization were observed. Conclusion: Excimer laser-shaped ACI offers an alternative treatment modality for patients with hyperopia. Acceptable visual results and similar regression rates were observed with ACI implantation compared with other laser refractive procedures.

Femtosecond Lasers in Cornea & Refractive Surgery

Since the introduction of femtosecond laser (FS) systems for corneal flap creation in laser-assisted in-situ keratomileusis there have been numerous applications for FS laser in corneal surgery. This manuscript details the utility of FS lasers in corneal surgical procedures including refractive laser surgeries, intracorneal ring segment tunnels, presbyopic treatments, and FS-assisted keratoplasty. We also review the role of FS lasers in diagnostic procedures such as two photon excitation fluorescence and second harmonic generation.

A comparative evaluation of parasymphyseal fracture fixation in edentulous patients performed using dynamic navigation systems and Herbert screws with the conventional two-plate method: A study on models

PurposeThe investigators performed this study to compare the rigidity outcomes for minimally invasive fixation of edentulous mandibular parasymphyseal fractures without flap creation using Herbert screws with a dynamic navigation system and the conventional two-plate method. MethodsThe investigators implemented an in-vitro study design, and 20 polyurethane edentulous mandibular models covered with flexible plastic to simulate the gingiva were used. Parasymphyseal fractures were created in all models using a reciprocal saw. In the study group, the fracture segments in each model were planned to be fixed using two 30-mm Herbert screws. The Herbert screws were placed using a screwdriver with the dynamic navigation system guiding the process. In the control group, to simulate open reduction, the fracture fragments were fixed using two 4-hole straight titanium plates and 6-mm titanium screws. All mandibular models on the prepared platform were attached to the biomechanical testing machine. They were subjected to a continuous linear compression until plastic deformation occurred. Displacement resistance was measured once for every model when the displacement reached 1, 3, 5, 10, and 15 mm. Furthermore, the maximum breaking forces that the models could withstand before deformation were measured. Data were analyzed using independent samples t-test. A value of p < .05 was considered statistically significant. ResultsManual examination of the models did not reveal any mobility between the fragments. In all evaluated displacement steps, the models fixed using Herbert screws showed significantly higher resistance to mechanical loading compared to the models fixed using parallel miniplates. ConclusionIn present study, parasymphyseal fracture of edentulous mandible models were fixed successfully using Herbert screws with the dynamic navigation system. The results of this study may encourage future clinical studies.

Comparison of Flap Characteristics Created with Two Different Methods in Laser in Situ Keratomileusis (LASIK).

Background:The creation of corneal flap is considered to be the most critical part of laser in situ keratomileusis (LASIK) surgery. Currently, flaps can be created with mechanical micorkeratomes or femtosecond lasers.Objective:To analyze and compare flap characteristics created with two different methods for flap creation in Laser in situ keratomileusis (LASIK).Methods:This was a retrospective study. The thickness and morphology of the flap were compared between the two mechanical microkeratomes (group I – Moria M2, group II – Moria SBK One Use Plus) and femtosecond laser (group III – Ziemer Femto LDV). Central flap thickness was measured intraoperatively, while the flap profile was measured with anterior optical coherence tomography at two axes (90° and 180°) and 5 measuring points on the first day, the first week, and one month after the surgery.Results:Central flap thickness was 110.91±15.79 micrometers (µm) (80-164 µm) in group I, 98.08±13.33 µm (65-136 µm) in group II and 103.52±13.89 µm (66-138 µm) in group III. Anterior optical coherence tomography revealed a meniscus-shaped flap in all three groups at both axes (90° and 180°). The least variability in flap thickness was observed in group III (±6 µm).Conclusion:All three methods of flap creation provide good shape and thickness reproducibility. Ziemer Femto LDV femtosecond laser had the least variable flap thickness in a single flap. Mechanical microkeratomes had slightly lower performance.

Effect of Diluted Vasopressin vs Saline on Intraoperative Blood Loss during Vaginal Hysterectomy- A Randomised Controlled Trial

Introduction: Vasopressin has been used to control blood loss in gynaecological surgeries such as in myomectomy, abdominal hysterectomy etc. Only few studies have demonstrated its efficacy in Vaginal Hysterectomy (VH) in reducing intraoperative blood loss. VH is frequently performed gynaecological surgery in safe lower dose of vasopressin. There is no consensus on dose of infiltration. Aim: To compare submucosal vasopressin vs saline infiltration during VH and assess surgical parameters i.e., intraoperative blood loss, postinfiltration vitals, ease of dissection, use of electrocautery, need of blood transfusion and complications. Materials and Methods: This randomised controlled trial was done in department of Obstetrics and Gynaecology in collaboration with Department of Anaesthesia from November 2017 to April 2019. Low risk women aged &lt;65 years with Pelvic Organ Prolapse Quantification-Stage (POP-Q stage) III/IV prolapse were recruited from Outpatient Department (OPD). They were randomised into two groups. Group I (n=35) patients received submucosal infiltration with diluted vasopressin (40mL vasopressin of 0.1U/mL, total 4U), prior to the incision. Group II (n=35) patients received 40cc of normal saline. Vitals were checked at one and five minutes postinfiltration. All the qualitative parameters were compared between the two groups by chi-square test and quantitative parameters by unpaired t-test. Inter and intragroup comparison was done by Repetitive Measure ANOVA followed by Tukey’s test. For the parameters, which did not follow the Gaussian distribution, were compared by non-parametric Mann-Whitney test between the two groups. A p-value &lt;0.05 was considered as significant. All the data analysis was carried out in Statistical Package for the Social Sciences (SPSS) version 20.0. Results: The mean estimated blood loss from incision till creation of flaps was half in vasopressin group as compared to saline group (21.33 mL vs 49.67 mL, p-value=0.001). Vasopressin group had less use of electrocautery, whereas ease of dissection was more in saline group. There was no significant difference in duration of surgery till flap creation and need of blood transfusion. There was fall in pulse rate and Blood Pressure (BP) in both groups which did not require medical intervention and was likely due to neuraxial anaesthesia. Conclusion: Vasopressin appears to be safe and effective in VH at infiltration dose of four units in dilution. However further studies on larger sample size are recommended to gather more evidence in this regard.

Effects of creation of bladder flap during cesarean section on long-term residual urine volume and postoperative urinary retention

Aim: Postpartum urinary retention (PUR) is an important clinical condition that is frequently detected after both vaginal and cesarean delivery. The aim of this study was to evaluate PUR in women who did and did not have bladder flaps created during cesarean section and the effect of Kegel exercises on long-term bladder muscle function in those with high postnatal residual urine volume. Methods: This prospective randomized study was conducted with 100 primiparous pregnant women who were to undergo elective cesarean section between April and December 2019. Patients were divided into two groups: The experimental group (bladder flap group, n=50) and the control group (non-bladder flap group, n=50). The study data were collected with the Maternal Information Form and UDI-6. Kegel exercise results, post-void residual volume and urinary system symptoms were assessed on the 2nd and 5th postoperative day and 6 weeks after birth. Results: There were no significant differences between the groups in terms of socio-demographic characteristics, postoperative 5th day and 6th week residual urine volume, postoperative urinary retention volume, urinary system symptoms (UDI-6 scores) and bladder injury. There were significant differences between the groups in terms of residual urine volume, duration of surgery, and pain values assessed on the second day (P=0.045, P<0.001, P<0.001, respectively). Intra group comparisons demonstrated a decrease in residual urine volume in the participants with high residual urine volume after Kegel exercises, and their postoperative 2nd day and 6th week residual urine volumes and UDI-6 scores were significantly different (P<0.001, P<0.001). Conclusion: The present study determined that bladder flaps created during cesarean section increases postoperative urinary retention. In patients with high residual urine volume, Kegel exercises reduce residual urine volumes and urinary symptoms in the long term.

Analysis and Causation of All Inaccurate Outcomes After WaveLight Contoura LASIK with LYRA Protocol.

PurposeThis study analyzes every eye that had an outcome greater than 0.25D of sphere or astigmatism from planned goal after treatment with WaveLight Contoura with LYRA Protocol.MethodsThe study included 266 consecutive eyes treated with LASIK Contoura using the LYRA Protocol. All LASIK procedures were performed on the WaveLight EX500 excimer laser. Flaps were created with either the Alcon WaveLight FS200 femtosecond laser or the Moria M2 microkeratome. Eyes that were off by >0.25 diopters (D) sphere or cylinder from the targeted goal within 3 months after surgery were identified and analyzed for cause. Topographical, higher-order aberration, and epithelial maps were created.ResultsCauses for inaccurate outcomes were biomechanical corneal change from LASK flap creation (9.78% of total eyes), pre-operative epithelial compensation of corneal higher-order aberration (4.1% of total eyes), changes to lamellar corneal tension from laser ablation causing a hyperopic shift (1.9% of total eyes), epithelial thickening over the ablation area post-operatively causing a refractive change (1.5% of total eyes), and posterior astigmatism (0.75%).ConclusionThe causes of the majority of inaccurate outcomes have not been properly defined and must be incorporated into further improving outcomes. Current and planned advances in technology do not address the majority of these causes.