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21,742 real negative results, null findings, and replication failures. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportOpen accessSurgery

Risk factors associated with secondary displacement in fractures of the humeral greater tuberosity

Qing-Quan Chen, Qing-Quan Chen, Han-Lin Chen et al. · 2025 · Frontiers in Surgery

BackgroundThe incidence of secondary displacement in fractures of the greater tuberosity of the humerus remains high, irrespective of whether conservative or surgical treatment is administered. However, the specific risk factors contributing to secondary displacement of the greater tuberosity of the humerus have not been previously reported. The primary objective of this study was to analyze the risk factors associated with secondary displacement of the greater tuberosity of the humerus and to summarize corresponding guidelines for clinical diagnosis and treatment.MethodsA retrospective analys

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Negative / Null Result ReportOpen accessMedicine

Effect and Mechanism of Swimming Exercise Preconditioning on Neurological Function of Mice with Intracerebral Hemorrhage

LI Yongxu, LIN Libin, LU Taotao et al. · 2023 · 康复学报

ObjectiveTo observe the effect of swimming exercise preconditioning on neurological function and expression levels of brain derived neurotrophic factor (BDNF), serine-threonine kinase (Akt) and peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) proteins in perihematoma tissues of mice with intracerebral hemorrhage (ICH).MethodsA total of 60 male C57BL/6 mice were randomly divided into sham group, ICH 7 d group, SEP+ICH 7 d group (preconditioning group 1), ICH 14 d group and SEP+ICH 14 d group (preconditioning group 2), with 12 cases in each group. The preconditioning group 1

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Negative / Null Result ReportOpen accessDiseases of the musculoskeletal system

Comparison of urinary parameters, biomarkers, and outcome of childhood systemic lupus erythematosus early onset-lupus nephritis

Daniele Faria Miguel, Maria Teresa Terreri, Rosa Maria Rodrigues Pereira et al. · 2020 · Advances in Rheumatology

Abstract Background Urinary parameters, anti-dsDNA antibodies and complement tests were explored in patients with childhood-Systemic Lupus Erythematosus (cSLE) early-onset lupus nephritis (ELN) from a large multicenter cohort study. Methods Clinical and laboratory features of cSLE cases with kidney involvement at presentation, were reviewed. Disease activity parameters including SLEDAI-2 K scores and major organ involvement at onset and follow up, with accrued damage scored by SLICC-DI, during last follow up, were compared with those without kidney involvement. Autoantibodies, renal function a

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Negative / Null Result ReportOpen accessDentistry

Comparative evaluation of platelet rich plasma in socket healing and bone regeneration after surgical removal of impacted mandibular third molars

Ravi Bhujbal, Neelima A Malik, Nilesh Kumar et al. · 2018 · Journal of Dental Research, Dental Clinics, Dental Prospects

Background. Surgical removal of mandibular third molars results in pain, swelling and bony defects, causing prolonged postoperative recovery. The growth factors present in platelet-rich plasma (PRP) can accelerate the healing, thereby shortening postoperative recovery period. This study was undertaken to evaluate the role of PRP in postoperative socket healing, pain, swelling and bone regeneration following surgical removal of impacted mandibular third molars. Methods. The present case‒control study was conducted on 20 patients with identical bilateral mandibular third molar impaction. PRP was

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Negative / Null Result ReportOpen accessNutrition. Foods and food supply

Endothelial Progenitor Cell Levels and Extent of Post-prandial Lipemic Response

Buket Akcan, Asim Örem, Yahya Altinkaynak et al. · 2022 · Frontiers in Nutrition

Background and ObjectiveDue to the frequency of meal ingestion, individuals spend the majority of the day, ~18 h, in a status of post-prandial (PP) stress. Remnant-like lipoprotein particles (RLPs) are predominant in PP phase playing an important role in the development of atherosclerosis. Endothelial progenitor cells (EPCs) have been suggested to play a role in vessel wall homeostasis and in reducing atherosclerosis. However, there is no information about peripheral blood EPCs number following PP stress. We investigated the association between circulating EPCs levels and extent of PP lipemia

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Negative / Null Result ReportOpen accessVeterinary medicine

Comparison of the feline Glasgow Composite Measured Pain Scale in a feline population without painful disease at home and in a veterinary hospital: a prospective clinical study

Virginia Rega, Stefanie Brause, Sabine BR Kästner et al. · 2025 · Journal of Feline Medicine and Surgery

Objectives The objective of this study was to compare the use of the feline Glasgow Composite Measured Pain Scale (CMPS-f) at home and in a veterinary hospital. The hypothesis was that pain-free cats would score higher in the CMPS-f when in a stressful situation than when calm and relaxed; that is, healthy but stressed cats could appear to be in discomfort or pain. Methods Healthy, non-painful adult cats owned by clinical staff were included in a prospective clinical trial with two observers (caregiver [CG] and researcher). Cats were scored by their CG at home (H), after arrival at the clinic

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Negative / Null Result ReportOpen accessTherapeutics. Pharmacology

Safety of using the intravenous beta-1-adrenoblocker esmolol in patients with ST-segment elevation myocardial infarction before primary percutaneous coronary intervention

O. A. Saygina, T. S. Sukhinina, M. A. Terenicheva et al. · 2026 · Рациональная фармакотерапия в кардиологии

Aim. To study the safety of using the intravenous beta-blocker (BB) esmolol in the early stages of ST-segment elevation myocardial infarction (STEMI) before primary percutaneous coronary intervention (PCI) based on an analysis of the incidence and clinical significance of adverse events (acute heart failure, hypotension, bradycardia, disorders of atrioventricular conduction (AV conduction), etc.) compared with the control group.Material and methods. The presented study is part of the randomized controlled trial ESMO-VASCMI (ClinicalTrials.gov NCT number 06376630) on the study of the cardioprot

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Negative / Null Result ReportOpen accessMedicine

Association between phthalate exposure and accelerated bone maturation in Chinese girls with early puberty onset: a propensity score-matched case–control analysis

Shurong Huang, Zhe Su, Huiping Su et al. · 2022 · Scientific Reports

Abstract Estrogen can promote the acceleration of bone maturation and phthalate esters (PAEs) have estrogen-mimicking effects. We investigated whether PAEs are associated with the acceleration of bone age (BA) in girls with early onset of puberty (EOP). This case–control study enrolled 254 girls with EOP from the Endocrinology Department at Shenzhen Children’s Hospital between December 2018 and August 2019. Ultra-performance liquid chromatography and tandem mass spectrometry were used to analyze the 10 metabolites of PAEs (mPAEs) in urine samples. BA was measured using an artificial intelligen

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Negative / Null Result ReportOpen accessDiseases of the blood and blood-forming organs

Outcomes of autologous transplantation for multiple myeloma according to different induction regimens

Edvan de Queiroz Crusoe, Fabiana Higashi, Maria Paula Nalesso Camargo Padilha et al. · 2014 · Revista Brasileira de Hematologia e Hemoterapia

Background: Induction therapy followed by high-dose chemotherapy and autologous transplantation is the standard treatment for suitable patients with multiple myeloma. Objective: The aim of this study was to assess whether induction therapy with thalidomidecontaining regimens was associated with improved results compared to vincristine, doxorubicin, and dexamethasone, and whether cyclophosphamide, thalidomide, and dexamethasone were associated with better results than thalidomide and dexamethasone. Methods: The records of 152 patients who underwent autologous transplantation at this institution

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Negative / Null Result ReportOpen accessSpecial aspects of education

Inventory of self-assessed competences: a tool for identifying training strengths and weaknesses in medical and multiprofessional residency programmes for primary health care

Élida de Fátima Diniz Souza, Ana Paula Ramos Machado, José Danúzio Leite de Oliveira et al. · 2025 · BMC Medical Education

Abstract Background In Brazil, residency programmes in Family and Community Medicine (FCM) and Multiprofessional Residency in Family Health (MRFH) are two-year specialisation courses, funded by the federal government, which aim to train professionals to work in Primary Health Care (PHC). The aim of this study was to draw up an inventory of the assessed competences of the residency programmes in the state of Paraíba, Brazil. Our study’s hypothesis is that self-assessment of competences can be a useful tool for monitoring the development of competences in the training of health professionals, co

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Negative / Null Result ReportOpen accessMedicine

25-Hydroxyvitamin D variability within-person due to diurnal rhythm and illness: a case report

Christine B. French, Sharon L. McDonnell, Reinhold Vieth · 2019 · Journal of Medical Case Reports

Abstract Background Vitamin D nutrition research requires accurate measures of circulating 25-hydroxyvitamin D. Our objectives were to test whether a diurnal fluctuation in blood-spot concentrations of 25-hydroxyvitamin D can be demonstrated statistically in a single individual, and whether such fluctuation is affected by the pre-dose versus post-dose timing of the blood draw. Case presentation The participant in this case study was a generally healthy Caucasian woman in her 40s who has taken 5000 IU vitamin D3 supplement at midday for over 1 year. Each blood sample was drawn individually from

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Negative / Null Result ReportOpen accessSpecial aspects of education

Thinking about thinking: changes in first-year medical students’ metacognition and its relation to performance

Wei Han Hong, Jamunarani Vadivelu, Esther Gnanamalar Sarojini Daniel et al. · 2015 · Medical Education Online

Background: Studies have shown the importance of metacognition in medical education. Metacognitive skills consist of two dimensions: knowledge of metacognition and regulation of metacognition. Aim: This study hypothesizes that the knowledge and regulation of metacognition is significantly different at the beginning and end of the academic year, and a correlation exists between the two dimensions of metacognitive skills with academic performance. Methods: The Metacognitive Skills Inventory comprising 52 Likert-scale items was administered to 159 first-year medical students at the University of

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Negative / Null Result ReportOpen accessOrthopedic surgery

Does Weber Classification Predict Patient Reported Outcomes using PROMIS Scores?

Steven M. Hadley BA, John J. Peabody MD, Sarah Westvold MPH et al. · 2024 · Foot & Ankle Orthopaedics

Category: Ankle; Trauma Introduction/Purpose: It remains unclear whether ankle fracture pattern as described by the Weber classification—a reproducible method describing the level of fracture with respect to the distal tibiofibular syndesmosis—impacts outcomes. Patient Reported Outcome Measurement Information System (PROMIS) is a validated measure of outcomes after foot and ankle surgery. To our knowledge, no study has compared PROMIS scores between Weber subtypes. Our study thus examines whether Weber fracture subtype impacts surgical outcomes as measured by PROMIS scores. We hypothesize that

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Negative / Null Result ReportOpen accessPublic aspects of medicine

The Effect of CXWORX Exercises with Inulin Consumption on Oxidative and Antioxidant Stress Indices in Women with Metabolic Syndrome

Zeynab Arbabi, Abdolali Banaiefar, Sajjad Arshadi et al. · 2023 · پیاورد سلامت

Background and Aim: Metabolic syndrome refers to a set of metabolic disorders related to obesity, such as abdominal obesity, increased body fat mass, lipid disorders, hypertension, increased blood glucose, and insulin resistance. The present study was conducted with the aim of determining the effect of 8 weeks of CXWORX exercises combined with inulin consumption on some indicators of oxidative stress in obese women with metabolic syndrome. Materials and Methods: Forty eight obese women with metabolic syndrome in the age range of 30 to 40 years were randomly divided into Control, inulin, CX exe

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Negative / Null Result ReportOpen accessNeurosciences. Biological psychiatry. Neuropsychiatry

Evaluation of ubiquitin C-terminal hydrolase-L1 enzyme levels in patients with epilepsy

Ibrahim Halil YASAK, Mustafa YILMAZ, Murat GÖNEN et al. · 2020 · Arquivos de Neuro-Psiquiatria

ABSTRACT Objective: Ubiquitin C-terminal Hydrolase-L1 (UCH-L1) enzyme levels were investigated in patients with epilepsy, epileptic seizure, remission period, and healthy individuals. Methods: Three main groups were evaluated, including epileptic seizure, patients with epilepsy in the non-seizure period, and healthy volunteers. The patients having a seizure in the Emergency department or brought by a postictal confusion were included in the epileptic attack group. The patients having a seizure attack or presenting to the Neurology outpatient department for follow up were included in the non-se

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Negative / Null Result ReportOpen accessFermentation industries. Beverages. Alcohol

Comparison of the Chemical Properties of Pineapple Vinegar and Mixed Pineapple and Dragon Fruit Vinegar

Antika Boondaeng, Sumaporn Kasemsumran, Kraireuk Ngowsuwan et al. · 2022 · Fermentation

Pineapples are a tropical fruit with high nutritional value and high vitamin and sugar contents. In this study, low-grade pineapples were fermented to produce vinegar using surface culture fermentation (SCF), which involved the addition of dragon fruit juice, to compare the quality and antioxidant activity of different preparations of vinegar. The highest acetic acid concentration (7.35%) was obtained from pineapple vinegar after 20 days of incubation. Vinegar made from mixed pineapple and dragon fruit juice without peel and vinegar with pineapple and dragon fruit juice with peel had acetic ac

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Negative / Null Result ReportOpen accessPublic aspects of medicine

Mediating effects of attitude on the relationship between knowledge and willingness to organ donation among nursing students

Xiaohang Chen, Xin Zhou, Yan Xu et al. · 2024 · Frontiers in Public Health

BackgroundThe current rate of organ donation in China falls significantly below the global average and the actual demand. Nursing students play a crucial role in supporting and promoting social and public welfare activities. This study primary aims to analyze the levels of knowledge, attitudes, willingness toward organ donation, and attitudes toward death among nursing students, and investigate the mediating role of attitude in the relationship between knowledge and willingness. The secondary aims to identify factors that may influence the willingness.MethodsA convenience sample of nursing stu

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Negative / Null Result ReportOpen accessMedicine

Effects of inulin, resistant starch RS3 and their complexes on blood lipid levels and intestinal flora in mice

ZHANG Yanan, MAO Chuanwu, XIONG Chenglong et al. · 2022 · Shanghai yufang yixue

ObjectiveTo explore the effects of different dietary induction models of inulin, resistant starch RS3 and their complexes on the body weight and intestinal flora in mice.MethodsA total of 64 C57BL/6 mice were randomly divided into low-fat control group, low-fat inulin group, low-fat resistant starch RS3 group, low-fat composite group and high-fat control group, high-fat inulin group, high-fat resistant starch RS3 group and high-fat composite group for dietary intervention. The mice were weighed and fresh feces were collected weekly. Diet intervention was continued until the weight of the high-

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Negative / Null Result ReportMedicine

Comparison of temporal versus nasal positioning of iStent Inject W®.

Vermot-Desroches V, Rezkallah A, Kodjikian L et al. · 2026 · Journal francais d'ophtalmologie

Purpose The goal of the present study was to compare the effect of nasal versus temporal placement of the iStent Inject W® during phacoemulsification on intraocular pressure (IOP). Design and participants Over 5 consecutive years, 389 eyes…

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Negative / Null Result ReportOpen accessMedicine (General)

Evaluation of the Effect of Unfavorable Working Conditions on the Incidence of Spontaneous Abortion in Operating Room Staff and Nurses

F Ansari, L Akbari, SH Kohan · 2021 · Armaghane Danesh Bimonthly Journal

Background & aim: Background and Aim: Among working women, health professionals are more exposed to environmental factors and unfavorable working conditions than working women. A large group of health professionals consists of nurses and operating room staff who provide services in hospitals. For this purpose, the present study was conducted to determine the effect of unfavorable working conditions on the incidence of spontaneous abortion in operating room staff and nurses of teaching hospitals in Isfahan. Methods: This was a retrospective analytical study. The statistical population included

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Negative / Null Result ReportOpen accessSurgery

Subclinical cardiac dysfunction detected by speckle-tracking echocardiography in patients with liver cirrhosis undergoing liver transplantation

Nguyen Tai Thu, Pham Dang Hai, Nguyen Thi Kieu Ly et al. · 2024 · Egyptian Liver Journal

Abstract Background Cirrhosis is associated with chronic cardiovascular dysfunction termed cirrhotic cardiomyopathy (CCM), characterized by myocardial hypertrophy and diastolic dysfunction. Detecting early cardiac changes is crucial, especially in patients undergoing liver transplantation. Objective: This study aims to evaluate left ventricular systolic function in cirrhotic patients undergoing liver transplantation using speckle-tracking echocardiography. Methods A prospective observational study was conducted involving 54 cirrhotic patients who underwent liver transplantation, along with 28

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Negative / Null Result ReportOpen accessPediatrics

The Relationship of Gonadotropin-releasing Hormone Agonists and Anthropometric Indices of Girls with Premature Idiopathic Central Precocious Puberty: A Cohort Study

Mohaddeseh Badpeyma, Roghayeh Molani-Gol, Fatemeh Sistanian et al. · 2024 · Iranian Journal of Neonatology

Background: This study aims to determine the effect of different GnRH agonist brands on body mass index (BMI), weight, and height in patients referred to the pediatric endocrinology clinic of Akbar Hospital.Methods: In this cohort study, 80 girls aged 5-8 years diagnosed with precocious puberty cases were included according to the Tanner staging and at the second puberty stage. The patients were classified into three groups of GnRH agonists, A, B, and C, receiving Diphereline, Microrelin, and Variopeptyl, respectively. Height, weight, and BMI were calculated every three months.Results: In grou

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Negative / Null Result ReportOpen accessDentistry

Is audio a mandatory component of multimedia distraction for reduction of pain and anxiety of pediatric dental patients? A split-mouth crossover randomized controlled clinical trial

Sara Jafarimofrad, Hamid Sarlak, Shima Nourmohammadi · 2022 · Dental Research Journal

Background: Control of pain, fear, and anxiety of pediatric dental patients is a common concern for the parents and dental clinicians. This study aimed to compare the efficacy of audiovisual distraction (AVD) and mute-video distraction (MVD) for reduction of pain and anxiety of pediatric dental patients. Materials and Methods: This randomized split-mouth crossover clinical trial evaluated 60 systemically healthy children between 4 and 7 years requiring bilateral pulpotomy of primary maxillary first molars. The samples were randomly divided into 6 groups based on the distraction technique and s

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Negative / Null Result ReportOpen accessMedicine (General)

Ankle and foot mechanics in individuals with chronic ankle instability during shod walking and barefoot walking: A cross-sectional study

Osama Ragaa Abdelraouf, Amr Almaz Abdel-aziem · 2021 · Chinese Journal of Traumatology

Purpose: This study evaluated the angular kinematic and moment of the ankle and foot during shod walking and barefoot walking in individuals with unilateral chronic ankle instability (CAI). Methods: Recreational soccer players with unilateral CAI were recruited for this cross sectional study conducted between January and August 2019. A total of 40 participants were screened for eligibility but only 31 met the inclusion criteria based on the methods of Delahunt et al and Gribble et al. Except for 3 participants not attending the evaluation session, 28 participants were finally included. A three

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Negative / Null Result ReportOpen accessMedicine

Comparison between single dose preoperative and postoperative effect of an- tibiotics in reduction of post appendectomy complications

Sabah Jalal Sherif, Baderkhan Saeed Ahmed, Botan Abdul Kadir Ali · 2023 · Advanced Medical Journal

Background and objective: Acute appendicitis is one of the most common surgical emergency con-ditions. This study was done to clarify the effect of antibiotics in reducing post appendectomy com- plications after open and laparoscopic appendectomy in patients with non-perforated appendicitis. Methods:This is a randomized controlled trial. Three hundred and twenty one patients, who underwent appendectomy for non-perforated appendicitis and fulfilled the selection criteria, were randomly divided into two groups. The patients in group A received double dose of pre-operative and postoperative antib

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Negative / Null Result ReportOpen accessDiseases of the circulatory (Cardiovascular) system

Comparison short time discharge with long time discharge following uncomplicated percutaneous coronary intervention for Non-ST elevation myocardial infarction patients

Guozhong Wang, Quanming Zhao, Qing Cheng et al. · 2019 · BMC Cardiovascular Disorders

Abstract Background The rational length of stay following non-complicated percutaneous coronary intervention (PCI) for Non-ST elevation myocardial infarction (NSTEMI) patients remains controversial. Few studies have examined the impact of early discharge on short-term outcomes in NSTEMI patients, but short-time discharge is not uncommon in real world practice. This study examined the impact of short time discharge following non-complicated PCI on 30-day net adverse clinical events in NSTEMI patients. Methods This retrospective study enrolled 1424 consecutive patients with NSTEMI diagnoses who

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Negative / Null Result ReportOpen accessPlant culture

Effects of Colchicine on Populus canescens Ectexine Structure and 2n Pollen Production

Qing Zhou, Qing Zhou, Qing Zhou et al. · 2020 · Frontiers in Plant Science

Triploid breeding is a central way to improve growth traits, timber quality, and stress resistance in Populus. In the present study, the morphology and viability of colchicine-induced 2n pollen, triploid production by crossing induced 2n pollen, and identification of genetic constitution of colchicine-induced 2n pollen were conducted in Populus canescens based on optimizing technology for inducing chromosome doubling in pollen. We found that the meiotic stage, injection time, and the interaction between the meiotic stage and injection time had highly significant effects on the 2n pollen produc

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Negative / Null Result ReportOpen accessDentistry

Composite surface roughness and color change following airflow usage

Azam Valian, Zahra Jaber Ansari, Mohammad Moien Rezaie et al. · 2021 · BMC Oral Health

Abstract Background Esthetic dental restorations have gained increasing popularity. The surface of restorations should be smooth enough to achieve maximum esthetics and prevent the adhesion of microorganisms and food particles. This study aimed to assess the surface roughness and color change of composite specimens following airflow usage. Methods In this in vitro, experimental study, 30 Tokuyama composite discs were fabricated and randomly divided into three groups (n = 10) for the use of airflow with calcium carbonate/bicarbonate powder and conventional polishing with FlexiDisc. The surface

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Negative / Null Result ReportOpen accessMedicine

Cardiac mortality predictability of T-wave alternans in young ST-elevated myocardial infarction patients with preserved cardiac function

Mustafa Umut Somuncu, Huseyin Karakurt · 2019 · Türk Kardiyoloji Derneği Arşivi

Objective: Primary prevention of sudden cardiac death in ST-elevation myocardial infarction (STEMI) is a complicated issue due to the highly heterogeneous population. The effect of T-wave alternans (TWA) on cardiac mortality has been examined in various populations, most often in patients with a high risk of fatal arrhythmia, such as patients with a low left ventricular ejection fraction (LVEF). The aim of the present study was to investigate the prevalence of TWA and its relationship to cardiac mortality in young STEMI patients with preserved LVEF. Methods: A total of 108 STEMI patients with

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