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Natural Progression Of Low-Gradient Severe Aortic Stenosis With Preserved Ejection Fraction, Antony Leslie Innasimuthu, Sanjay Kumar, Jason Lazar, William E Katz

The Texas Heart Institute Journal

Because the natural progression of low-gradient aortic stenosis (LGAS) has not been well defined, we performed a retrospective study of 116 consecutive patients with aortic stenosis who had undergone follow-up echocardiography at a median interval of 698 days (range, 371–1,020 d). All patients had preserved left ventricular ejection fraction (>0.50) during and after follow-up.

At baseline, patients were classified by aortic valve area (AVA) as having mild stenosis (≥1.5 cm2), moderate stenosis (≥1 to <1.5 cm2), or severe stenosis (<1 cm2). Severe aortic stenosis was further classified by mean gradient (LGAS, mean <40 mmHg; high-gradient aortic stenosis [HGAS], mean ≥40 mmHg). We compared baseline and follow-up values among 4 groups: patients with mild stenosis, moderate stenosis, LGAS, and HGAS.

At baseline, 30 patients had mild stenosis, 54 had moderate stenosis, 24 had LGAS, and 8 had HGAS. Compared with the moderate group, the LGAS …

Outpatient Management Of Heart Failure In The United States, 2006-2008, Kailash Mosalpuria, Sunil K Agarwal, Sirin Yaemsiri, Bredy Pierre-Louis, Samir Saba, Rene Alvarez, Stuart D Russell

The Texas Heart Institute Journal

Better outpatient management of heart failure might improve outcomes and reduce the number of rehospitalizations. This study describes recent outpatient heart-failure management in the United States.

We analyzed data from the National Ambulatory Medical Care Survey of 2006–2008, a multistage random sampling of non-Federal physician offices and hospital outpatient departments.

Annually, 1.7% of all outpatient visits were for heart failure (51% females and 77% non-Hispanic whites; mean age, 73 ± 0.5 yr). Typical comorbidities were hypertension (62%), hyperlipidemia (36%), diabetes mellitus (35%), and ischemic heart disease (29%). Body weight and blood pressure were recorded in about 80% of visits, and …

Sex-Specific Biatrial Volumetric Measurements Obtained With Use Of Multidetector Computed Tomography In Subjects With And Without Coronary Artery Disease, Matthew J Budoff, Sandeep R Pagali, Yasmin S Hamirani, Andy Chen, Gordon Cheu, Yanlin Gao, Dong Li, Songshou Mao

The Texas Heart Institute Journal

Atrial volumetric measurement has proven clinical implications. Advances in cardiac imaging, notably the precision enabled by multidetector computed tomography (MDCT), herald the need for new criteria of what constitutes normal volumetric measurements. With use of 64-slice MDCT, we compared the atrial volumes in healthy individuals with those in individuals with coronary artery disease.

By means of manual segmentation, we measured biatrial volume in 686 participants who underwent retrospective electrocardiographic-gated MDCT angiographic evaluation. The study population included a control group of 203 persons with no cardiac abnormalities, and a study group of 483 patients with obstructive coronary artery disease. All variables …

Spontaneous Coronary Artery Dissection (Scad): New Insights Into This Not-So-Rare Condition, Sharonne N Hayes

The Texas Heart Institute Journal

No abstract provided.

A Written Self-Help Intervention For Depressed Adults Comparing Behavioural Activation Combined With Physical Activity Promotion With A Self-Help Intervention Based Upon Behavioural Activation Alone: Study Protocol For A Parallel Group Pilot Randomised Controlled Trial (Bacpac)., Paul Farrand, Claire Pentecost, Colin Greaves, Rs Taylor, Fiona Warren, Colin Green, Melvyn Hillsdon, Phil Evans, Jo Welsman, Ah Taylor

Peninsula Medical School

BACKGROUND: Challenges remain to find ways to support patients with depression who have low levels of physical activity (PA) to overcome perceived barriers and enhance the perceived value of PA for preventing future relapse. There is an evidence-base for behavioural activation (BA) for depression, which focuses on supporting patients to restore activities that have been avoided, but practitioners have no specific training in promoting PA. We aimed to design and evaluate an integrated BA and PA (BAcPAc) practitioner-led, written, self-help intervention to enhance both physical and mental health. METHODS/DESIGN: This study is informed by the Medical Research Council Complex Intervention …

Manage At Work: A Randomized, Controlled Trial Of A Self-Management Group Intervention To Overcome Workplace Challenges Associated With Chronic Physical Health Conditions, William S. Shaw, Elyssa Besen, Glenn Pransky, Cécile R. L. Boot, Michael K. Nicholas, Robert K. Mclellan, Torill H. Tveito

Dartmouth Scholarship

Background: The percentage of older and chronically ill workers is increasing rapidly in the US and in many other countries, but few interventions are available to help employees overcome the workplace challenges of chronic pain and other physical health conditions. While most workers are eligible for job accommodation and disability compensation benefits, other workplace strategies might improve individual-level coping and problem solving to prevent work disability. In this study, we hypothesize that an employer-sponsored group intervention program employing self-management principles may improve worker engagement and reduce functional limitation associated with chronic disorders.

Methods: In a randomized controlled trial (RCT), workers …

Conflict Translates Environmental And Social Risk Into Business Costs, Daniel M. Franks, Rachel Davis, Anthony J. Bebbington, Saleem H. Ali, Deanna Kemp, Martin Scurrah

Faculty Publications

Sustainability science has grown as a field of inquiry, but has said little about the role of large-scale private sector actors in socio-ecological systems change. However, the shaping of global trends and transitions depends greatly on the private sector and its development impact. Market-based and command-and-control policy instruments have, along with corporate citizenship, been the predominant means for bringing sustainable development priorities into private sector decision-making. This research identifies conflict as a further means through which environmental and social risks are translated into business costs and decision making. Through in-depth interviews with finance, legal, and sustainability professionals in the extractive …

A Global Compendium Of Human Dengue Virus Occurrence, Jane P. Messina, Oliver J Brady, David M. Pigott, John S. Brownstein, Anne Hoen, Simon Hay

Dartmouth Scholarship

A global geographic database of human dengue virus occurrence was produced to generate a global risk map and associated burden estimates1. Herein we present the database, which comprises occurrence data linked to point or polygon locations, derived from peer-reviewed literature and case reports as well as informal online sources. Entries date from 1960 to 2012. We describe all data collection processes in full, as well as geo-positioning, database management and quality-control procedures. This is the most comprehensive database of confirmed human dengue infection to-date, consisting of 8,309 geo-positioned occurrences in total.

Interventions To Improve Delivery Of Isoniazid Preventive Therapy: An Overview Of Systematic Reviews, Lisa V. Adams, Elizabeth A. Talbot, Karen Odato, Heather Blunt, Karen R. Steingart

Dartmouth Scholarship

Background:

Uptake of isoniazid preventive therapy (IPT) to prevent tuberculosis has been poor, particularly in the highest risk populations. Interventions to improve IPT delivery could promote implementation. The large number of existing systematic reviews on treatment adherence has made drawing conclusions a challenge. To provide decision makers with the evidence they need, we performed an overview of systematic reviews to compare different organizational interventions to improve IPT delivery as measured by treatment completion among those at highest risk for the development of TB disease, namely child contacts or HIV-infected individuals.

Methods:

We searched the Cochrane Database of Systematic Reviews, the …

Airway Obstruction In Congenital Central Hypoventilation Syndrome, Alexandra K Reverdin, Ricardo Mosquera, Giuseppe N Colasurdo, Cindy K Jon, Roya M Clements

Faculty, Staff and Student Publications

Congenital central hypoventilation syndrome (CCHS) is the failure of the autonomic system to control adequate ventilation while asleep with preserved ventilatory response while awake. We report a case of a patient with CCHS who presented with intrathoracic and extrathoracic airway obstruction after tracheostomy tube decannulation and phrenic nerve pacer placement. Nocturnal polysomnography (NPSG) revealed hypoxia, hypercapnia and obstructive sleep apnoea, which required bilevel positive airway pressure titration. Airway endoscopy demonstrated tracheomalacia and paretic true vocal cords in the paramedian position during diaphragmatic pacing. Laryngeal electromyography demonstrated muscular electrical impulses that correlated with diaphragmatic pacer settings. Thus, we surmise that the …

Expression Of Murine 5-Aminolevulinate Synthase Variants Causes Protoporphyrin Ix Accumulation And Light-Induced Mammalian Cell Death, Erica J. Fratz, Gregory A. Hunter, Gloria C. Ferreira

Chemistry Faculty Publications

5-Aminolevulinate synthase (ALAS; EC 2.3.1.37) catalyzes the first committed step of heme biosynthesis in animals. The erythroid-specific ALAS isozyme (ALAS2) is negatively regulated by heme at the level of mitochondrial import and, in its mature form, certain mutations of the murine ALAS2 active site loop result in increased production of protoporphyrin IX (PPIX), the precursor for heme. Importantly, generation of PPIX is a crucial component in the widely used photodynamic therapies (PDT) of cancer and other dysplasias. ALAS2 variants that cause high levels of PPIX accumulation provide a new means of targeted, and potentially enhanced, photosensitization. In order to assess …

A Training Programme To Build Cancer Research Capacity In Low- And Middle-Income Countries: Findings From Guatemala, Lauren D Arnold, Joaquin Barnoya, Eduardo N Gharzouzi, Peter Benson, Graham A Colditz

2010-2019 OA Pubs

PROBLEM: Guatemala is experiencing an increasing burden of cancer but lacks capacity for cancer prevention, control and research.

APPROACH: In partnership with a medical school in the United States of America, a multidisciplinary Cancer Control Research Training Institute was developed at the Instituto de Cancerología (INCAN) in Guatemala City. This institute provided a year-long training programme for clinicians that focused on research methods in population health and sociocultural anthropology. The programme included didactic experiences in Guatemala and the United States as well as applied training in which participants developed research protocols responsive to Guatemala's cancer needs.

LOCAL SETTING: Although INCAN …

Exploration And Confirmation Of The Latent Variable Structure Of The Jefferson Scale Of Empathy., Mohammadreza Hojat, Marianna Lanoue

Department of Psychiatry and Human Behavior Faculty Papers

OBJECTIVE: To reaffirm the underlying components of the JSE by using exploratory factor analysis (EFA), and to confirm its latent variable structure by using confirmatory factor analysis (CFA).

METHODS: Research participants included 2,612 medical students who entered Jefferson Medical College between 2002 and 2012. This sample was divided into two groups: Matriculants between 2002 and 2007 (n=1,380) and be-tween 2008 and 2012 (n=1,232). Data for 2002-2007 matriculants were subjected to EFA (principal component factor extraction), and data for matriculants of 2008-2012 were used for CFA (structural equation modeling, and root mean square error for approximation.

RESULTS: The EFA resulted in …

Recruitment Of The Adaptor Protein Grb2 To Egfr Tetramers, Noga Kozer, Dipak Barua, Christine Henderson, Eduoard C. Nice, Antony W. Burgess, William S. Hlavacek, Andrew H. A. Clayton

Chemical and Biochemical Engineering Faculty Research & Creative Works

Adaptor protein Grb2 binds phosphotyrosines in the epidermal growth factor (EGF) receptor (EGFR) and thereby links receptor activation to intracellular signaling cascades. Here, we investigated how recruitment of Grb2 to EGFR is affected by the spatial organization and quaternary state of activated EGFR. We used the techniques of image correlation spectroscopy (ICS) and lifetime-detected Förster resonance energy transfer (also known as FLIM-based FRET or FLIM-FRET) to measure ligand-induced receptor clustering and Grb2 binding to activated EGFR in BaF/3 cells. BaF/3 cells were stably transfected with fluorescently labeled forms of Grb2 (Grb2-mRFP) and EGFR (EGFR-eGFP). Following stimulation of the cells with …

Emergent Surgical Pulmonary Embolectomy In A Pregnant Woman: Case Report And Literature Review, Giovanni Saeed, Michael Möller, Jörg Neuzner, Rainer Gradaus, Werner Stein, Uwe Langebrake, Thomas Dimpfl, Meradjoddin Matin, Ali Peivandi

The Texas Heart Institute Journal

Acute pulmonary embolism is a leading cause of death during pregnancy and delivery in the United States. We describe the case of a 25-year-old woman who presented in cardiogenic shock in week 38 of her first pregnancy. After the emergent cesarean delivery of a healthy male neonate, the mother underwent immediate surgical pulmonary embolectomy. We confirmed the diagnosis of pulmonary embolism intraoperatively by means of transesophageal echocardiography and removed large clots from the patient's pulmonary arteries. Mother and child were doing well, 27 months later. In addition to presenting our patient's case, we discuss the other relevant reports and the …

The Odyssey Of Tavr From Concept To Clinical Reality, Alain G Cribier

The Texas Heart Institute Journal

No abstract provided.

Serum Levels Of Soluble Icam-1 In Children With Pulmonary Artery Hypertension, Melahat Melek Oguz, Ayse Deniz Oguz, Cihat Sanli, Ayhan Cevik

The Texas Heart Institute Journal

This prospective cross-sectional study attempted to determine both the usefulness of the serum intercellular adhesion molecule-1 (ICAM-1) as a biomarker for pulmonary artery hypertension secondary to congenital heart disease and the nature of this marker's association with catheter angiographic findings.

Our study included a total of 70 male and female children, comprising 30 patients with both pulmonary artery hypertension and congenital heart disease, 20 patients with congenital heart disease alone, and 20 healthy control subjects. Levels of ICAM-1 in plasma samples from all groups were measured by the enzyme-linked immunosorbent assay method. Cardiac catheterization was also performed in all patients. …

The 1,000th Vad, The Great Rivalry, And The Grand Experiment Of The Texas Medical Center, Todd K Rosengart

The Texas Heart Institute Journal

No abstract provided.

Cardiac Magnetic Resonance Imaging For The Investigation Of Cardiovascular Disorders Part 2: Emerging Applications, Ajit H Goenka, Hui Wang, Scott D Flamm

The Texas Heart Institute Journal

Cardiac magnetic resonance imaging has emerged as a robust noninvasive technique for the investigation of cardiovascular disorders. The coming-of-age of cardiac magnetic resonance—and especially its widening span of applications—has generated both excitement and uncertainty in regard to its potential clinical use and its role vis-à-vis conventional imaging techniques. The purpose of this evidence-based review is to discuss some of these issues by highlighting the current (Part 1, previously published) and emerging (Part 2) applications of cardiac magnetic resonance. Familiarity with the versatile uses of cardiac magnetic resonance will facilitate its wider clinical acceptance for improving the management of patients with …

Aging Aggravates Nitrate-Mediated Ros/Rns Changes., Qian Fan, Lifen Chen, Shujuan Cheng, Fang Li, Wayne Bond Lau, Le Feng Wang, Jing Hua Liu

Department of Emergency Medicine Faculty Papers

Nitrates are the most frequently prescribed and utilized drugs worldwide. The elderly are a major population receiving nitrate therapy. Both nitrates and aging can increase in vivo reactive oxygen species (ROS) and reactive nitrogen species (RNS). To date, the effects of aging upon nitrate-induced ROS/RNS alteration are unknown. The present study tested the effects of aging upon nitrate-induced ROS/RNS alteration in vivo. 32 adults and 43 elderly unstable angina (UA) patients were subjected to 48 hours of isosorbide dinitrate intravenous injection (50  μg/minutes) in this clinical study. Blood samples were obtained at baseline and conclusion. Outcome measures of oxidative stress …

Prevalence Of Small-For-Gestational Age And Its Mortality Risk Varies By Choice Of Birth-Weight-For-Gestation Reference Population, Joanne D. Katz, Lauren A. Wu, Luke C. Mullany, Christian L. Coles, Anne C.C. Lee, Naoko Kozuki, James M. Tielsch

Global Health Faculty Publications

Background

We use data from rural Nepal and South India to compare the prevalence of small-for-gestational-age (SGA) and neonatal mortality risk associated with SGA using different birth-weight-for-gestation reference populations.

Methods

We identified 46 reference populations in low-, middle-, and high-income countries, of which 26 met the inclusion criteria of being commonly cited and having numeric 10th percentile cut points published. Those reference populations were then applied to populations from two community-based studies to determine SGA prevalence and its relative risk of neonatal mortality.

Results

The prevalence of SGA ranged from 10.5% to 72.5% in Nepal, and 12.0% to 78.4% in …

Irf8 Suppresses Pathological Cardiac Remodelling By Inhibiting Calcineurin Signalling., Ding-Sheng Jiang, Xiang Wei, Xiao-Fei Zhang, Yu Liu, Yan Zhang, Ke Chen, Lu Gao, Heng Zhou, Xue-Hai Zhu, Peter P. Liu, Wayne Bond Lau, Xin-Liang Ma, Yunzeng Zou, Xiao-Dong Zhang, Guo-Chang Fan, Hongliang Li

Department of Emergency Medicine Faculty Papers

Interferon regulatory factor 8 (IRF8) is known to affect the innate immune response, for example, by regulating the differentiation and function of immune cells. However, whether IRF8 can influence cardiac hypertrophy is unknown. Here we show that IRF8 levels are decreased in human dilated/hypertrophic cardiomyopathic hearts and in murine hypertrophic hearts. Mice overexpressing Irf8 specifically in the heart are resistant to aortic banding (AB)-induced cardiac hypertrophy, whereas mice lacking IRF8 either globally or specifically in cardiomyocytes develop an aggravated phenotype induced by pressure overload. Mechanistically, we show that IRF8 directly interacts with NFATc1 to prevent NFATc1 translocation and thus inhibits …

A Review Of The Global Literature On Dental Therapists, David A. Nash, Jay W. Friedman, Kavita R. Mathu-Muju, Peter G. Robinson, Julie Satur, Susan Moffat, Rosemary Kardos, Edward C. M. Lo, Anthony H. H. Wong, Nasruddin Jaafar, Jos Van Den Heuvel, Prathip Phantumvanit, Eu Oy Chu, Rahul Naidu, Lesley Naidoo, Irving Mckenzie, Eshani Fernando

Oral Health Science Faculty Publications

OBJECTIVE: Access to adequate oral health care is deficient in many parts of the world. Many countries are now using dental therapists to increase access, particularly for children. To inform the discussion on dental therapists in the workforce, particularly in the United States, the W.K. Kellogg Foundation funded a review of the global literature to identify as many documents as possible related to the practice of dental therapists since the establishment of the School Dental Service in New Zealand in 1921.

METHODS: Consultants in each of the countries considered to have a substantive literature on dental therapists were …

A Novel In Vivo Model For Evaluating Functional Restoration Of A Tissue-Engineered Salivary Gland., Swati Pradhan-Bhatt, Daniel A Harrington, Randall L Duncan, Mary C Farach-Carson, Xinqiao Jia, Robert L Witt

Department of Otolaryngology - Head and Neck Surgery Faculty Papers

OBJECTIVES/HYPOTHESIS: To create a novel model for development of a tissue-engineered salivary gland from human salivary gland cells that retains progenitor cell markers useful for treatment of radiation-induced xerostomia.

STUDY DESIGN: A three-dimensional (3D) hyaluronic acid (HA)-based hydrogel scaffold was used to encapsulate primary human salivary gland cells and to obtain organized acini-like spheroids. Hydrogels were implanted into rat models, and cell viability and receptor expression were evaluated.

METHODS: A parotid gland surgical resection model for xenografting was developed. Salivary cells loaded in HA hydrogels formed spheroids and in vitro were implanted in the three-fourths resected parotid bed of athymic …

Language Barriers To Informed Consent For Dermatologic Interventions., Jordan Wang, Matthew Keller

Department of Dermatology and Cutaneous Biology Faculty Papers

CASE SCENARIO

A 39-year-old Spanish-speaking woman with limited English-language proficiency presents with her 13-year-old son to your private dermatology practice. Through her son, you learn the patient is worried about a mole that has significantly grown in size over the past 3 months. After examination, you recommend the nevus be biopsied to better evaluate it. However, you are barely able to communicate with the patient, and you suspect that her son is not interpreting everything you say based on his especially brief communications with her. To proceed with the biopsy, you must first obtain informed consent.

As the dermatologist, you …

Systemic Effects Of Intracoronary Nitroglycerin During Coronary Angiography In Children After Heart Transplantation, Diego A Lara, Mary K Olive, James F George, Robert N Brown, Waldemar F Carlo, Edward V Colvin, Brad L Steenwyck, F Bennett Pearce

The Texas Heart Institute Journal

Coronary spasm during coronary angiography for vasculopathy in children can be prevented by the intracoronary administration of nitroglycerin. We reviewed the anesthesia and catheterization reports and charts for pediatric transplant recipients who underwent angiography from 2005 through 2010. Correlation analysis was used to study the relation of post-injection systolic blood pressure (SBP) to nitroglycerin dose. Forty-one angiographic evaluations were performed on 25 patients (13 male and 12 female). Mean age was 9.9 ± 3.2 years (range, 3.3–16.1 yr). The mean total dose of nitroglycerin was 2.93 ± 1.60 µg/kg (range, 1–8 µg/kg).

There was a significant drop between the baseline …

A Prospective, Multicenter, Phase I Matched-Comparison Group Trial Of Safety, Pharmacokinetics, And Preliminary Efficacy Of Riluzole In Patients With Traumatic Spinal Cord Injury., Robert G Grossman, Michael G Fehlings, Ralph F Frankowski, Keith D Burau, Diana S L Chow, Charles Tator, Angela Teng, Elizabeth G Toups, James Harrop, Bizhan Aarabi, Christopher I Shaffrey, Michele M Johnson, Susan J Harkema, Maxwell Boakye, James D Guest, Jefferson R Wilson

Department of Neurosurgery Faculty Papers

A prospective, multicenter phase I trial was undertaken by the North American Clinical Trials Network (NACTN) to investigate the pharmacokinetics and safety of, as well as obtain pilot data on, the effects of riluzole on neurological outcome in acute spinal cord injury (SCI). Thirty-six patients, with ASIA impairment grades A-C (28 cervical and 8 thoracic) were enrolled at 6 NACTN sites between April 2010 and June 2011. Patients received 50 mg of riluzole PO/NG twice-daily, within 12 h of SCI, for 14 days. Peak and trough plasma concentrations were quantified on days 3 and 14. Peak plasma concentration (Cmax) and …

Papillary Muscle Repositioning As A Subvalvular Apparatus Preservation Technique In Mitral Stenosis Patients With Normal Left Ventricular Systolic Function, Imthiaz Manoly, Dimos Karangelis, Nicola Viola, Marcus Haw

The Texas Heart Institute Journal

Surgically repairing Bland-White-Garland syndrome (anomalous origin of the left coronary artery from the pulmonary artery) is a challenge if there are variations in the origin of the anomalous artery. We report the successful repair of this congenital abnormality in a 19-year-old woman who presented with an acute anterior myocardial infarction. The anomalous artery originated from the anterior-facing sinus of the pulmonary artery, which precluded typical repair by direct reimplantation or fashioning an intrapulmonary tunnel. We created an extrapulmonary tunnel, using a strip of pulmonary artery anteriorly and an aortic flap posteriorly. Three years postoperatively, the anastomosis was patent and the …

Cardiac Magnetic Resonance Imaging For The Investigation Of Cardiovascular Disorders Part 1: Current Applications, Ajit H Goenka, Scott D Flamm

The Texas Heart Institute Journal

Cardiac magnetic resonance imaging is a robust noninvasive technique for investigating cardiovascular disorders. The evolution of cardiac magnetic resonance and its widening span of diagnostic and prognostic applications have generated excitement as well as uncertainty regarding its potential clinical use and its role vis-à-vis conventional imaging techniques. The purpose of this evidence-based review is to discuss some of these issues by highlighting the current (Part 1) and emerging (Part 2) applications of cardiac magnetic resonance. Familiarity with the versatility and usefulness of cardiac magnetic resonance will facilitate its wider clinical acceptance for improving the management of cardiovascular disorders.

Papillary Muscle Repositioning As A Subvalvular Apparatus Preservation Technique In Mitral Stenosis Patients With Normal Left Ventricular Systolic Function, Gokhan Lafci, Kerim Cagli, Omer Faruk Cicek, Kemal Korkmaz, Osman Turak, Alper Uzun, Adnan Yalcinkaya, Adem Diken, Eren Gunertem, Kumral Cagli

The Texas Heart Institute Journal

Subvalvular apparatus preservation is an important concept in mitral valve replacement (MVR) surgery that is performed to remedy mitral regurgitation. In this study, we sought to determine the effects of papillary muscle repositioning (PMR) on clinical outcomes and echocardiographic left ventricular function in rheumatic mitral stenosis patients who had normal left ventricular systolic function.

We prospectively assigned 115 patients who were scheduled for MVR surgery with mechanical prosthesis to either PMR or MVR-only groups. Functional class and echocardiographic variables were evaluated at baseline and at early and late postoperative follow-up examinations. All values were compared between the 2 groups.

The …