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12,263 real negative results, null findings, and replication failures in Medicine. 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 accessMedicine

Association of outpatient use of renin–angiotensin–aldosterone system blockers on outcomes of acute respiratory illness during the COVID-19 pandemic: a cohort study

Molly Moore Jeffery, Lucas Oliveira J e Silva, Fernanda Bellolio et al. · 2022 · BMJ Open

Objectives Evaluate the associations between patients taking ACE inhibitors and angiotensin receptor blockers (ARBs) and their clinical outcomes after an acute viral respiratory illness (AVRI) due to COVID-19.Design Retrospective cohort.Setting The USA; 2017–2018 influenza season, 2018–2019 influenza season, and 2019–2020 influenza/COVID-19 season.Participants People with hypertension (HTN) taking an ACEi, ARB or other HTN medications, and experiencing AVRI.Main outcome measures Change in hospital admission, intensive care unit (ICU) or coronary care unit (CCU), acute respiratory distress (ARD

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Negative / Null Result ReportOpen accessMedicine

Allergic sensitization does not influence advancement or survival in oral cancer

Lara Kakabas, Krzysztof Piersiala, Aeneas Kolev et al. · 2023 · Scientific Reports

Abstract A history of allergies has been said to be associated with a lower risk of head and neck cancer compared to the general population. However, it is not known whether having an allergic sensitization influences the prognosis and advancement of cancer disease. Thus, the aim of the study was to investigate the relationship between allergic sensitization and oral cancer advancement and patient survival. Allergen-specific IgE antibodies were investigated by ImmunoCAP™ Rapid in consecutive 80 patients with oral cancer. ImmunoCAP Rapid system tests a mix of representative inhalant allergens s

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Negative / Null Result ReportOpen accessMedicine

RETROSPECTIVE OBSERVATIONAL STUDY ON THE INCIDENCE OF ORAL COMPLICATIONS IN PATIENTS WITH DIABETES MELLITUS

Alberta Simona Tinu, Doina Lucia Ghergic, Mirel Stoian et al. · 2018 · Romanian Journal of Stomatology

Objectives. We performed a retrospective observational analytical study to determine the incidence of complications in the oral cavity in a group of patients diagnosed with diabetes mellitus. Material and method. We have studied 68 diabetic patients, who have been referred to dental practices seeking specialized treatment. Patient data sheets were centralized, categorized, and statistically processed with IBM SPSS Statistics 22 and Microsoft Excel 2010 depending on: sex of patients, age, type of diabetes, time elapsed from diagnosis of diabetes, the environment of origin of the patients, the l

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Negative / Null Result ReportOpen accessMedicine

The Effectiveness of Immature Granulocyte Count for Predicting COVID-19 Severity and Poor Outcomes

Yunsur Çevik, Fatma Nur Karaarslan, Şeref Kerem Çorbacıoğlu et al. · 2022 · Eurasian Journal of Emergency Medicine

Aim:The aim of this study was to examine the relationship between immature granulocyte (IG) counts and the severity of the disease and to evaluate the effectiveness of IG in predicting the poor outcomes in polymerase chain reaction-confirmed Coronavirus disease-2019 (COVID-19) cases.Materials and Methods:The study was conducted prospectively and observationally at the emergency department. Patients were divided into three groups according to the clinical severity indicators such as mild, moderate and severe. The IG level was measured from the whole blood samples taken at the admission to the e

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Negative / Null Result ReportOpen accessMedicine

Associations between CYP2C8 rs10509681 and rs11572080 gene polymorphisms and age-related macular degeneration

Rasa Liutkevičienė, Ramunė Sungailienė, Alvita Vilkevičiūtė et al. · 2017 · Acta Medica Lituanica

Background. Age-related macular degeneration (AMD) is the most common cause of irreversible visual loss in industrialized countries. Early symptoms of AMD include drusen and changes in retinal pigment epithelium. However, the etiology of AMD and drusen formation is not fully understood. Recent studies suggest that CYP2C8-related metabolic processes might play an important role in the development of AMD. The aim of our study is to investigate CYP2C8 rs10509681 and CYP2C8 rs11572080 genotype frequencies in patients with early AMD and to compare them with healthy controls. Materials and Methods.

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Negative / Null Result ReportOpen accessMedicine

Origins of the obturator artery in Thai and Chinese

Damkoeng Purnindu · 2023 · Siriraj Medical Journal

Dissection of one-half of adult pelvis in 197 Thai and 44 Chinese cadavers disclosed that the obturator artery arose from the internal iliac and umbilical arteries in 34.9%, from the inferior gluteal artery in 10.4%, from the internal pudendal artery in 8.7%, from the superior gluteal - inferior gluteal trunk in 4.2%, from the inferior gluteal - internal pudendal trunk in 9.1%, from the inferior epigastric artery in 12.0%, from the external iliac artery in 1.2%, and from the superior gluteal and the inferior epigastric arteries in 0.4%. There were no statistically significant differences of fi

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Negative / Null Result ReportOpen accessMedicine

Correlation of body mass index and orthostatic hypotension in patients with hypertension on ACE inhibitor monotherapy

Tasić Danijela, Kovačević Zorana, Mitrović Miroslav et al. · 2021 · Scripta Medica

Background/Aim: Orthostatic hypotension (OH) is considered to be a drop in the systolic and diastolic blood pressure (> 20 mmHg; > 10 mmHg) 3 minutes from postural changes. The objective of this study was to analyse the correlation of body mass index (BMI) and OH during the treatment with trandolapril, as a single-drug treatment of hypertension. Methods: The study involved 255 patients (average age 54.3 ± 11.7; 54.1 % men) with poorly regulated hypertension, who were given trandolapril as a single-drug treatment. The patients were divided into two groups regarding stage of hypertension: first-

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Negative / Null Result ReportOpen accessMedicine

Impact of an Online Gastrointestinal Symptom History Taker on Physician Documentation and Charting Time: Pragmatic Controlled Trial

Hall, Natalie J, Berry, Sameer K, Aguilar, Jack et al. · 2021 · JMIR Formative Research

BackgroundA potential benefit of electronic health records (EHRs) is that they could potentially save clinician time and improve documentation by auto-generating the history of present illness (HPI) in partnership with patients prior to the clinic visit. We developed an online patient portal called AEGIS (Automated Evaluation of Gastrointestinal [GI] Symptoms) that systematically collects patient GI symptom information and then transforms the data into a narrative HPI that is available for physicians to review in the EHR prior to seeing the patient. ObjectiveThis study aimed to compare whether

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Negative / Null Result ReportOpen accessMedicine

Is pomegranate peels infusion effective for disinfection of toothbrushes?

Priscila Lima de Luna FREIRE, Priscila Hernández CAMPOS, Fabíola Galbiatti CARVALHO et al. · Revista de Odontologia da UNESP

Abstract Introduction Methods of decontamination or sanitization of toothbrushes have been questioned. Objective This study assessed the effectiveness of pomegranate peels infusion as a disinfectant of toothbrushes against Streptococcus mutans. Material and method A sample of 16 schoolchildren aged between 7 and 9 years performed brushing 5 days/week, with a careful brushing once a day. After each day of brushing, the toothbrushes were washed and sprayed with one disinfectant solution. This procedure was repeated for 4 weeks using one of the different solutions per week: distilled water (G1; n

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Failed Experiment ReportOpen accessMedicine

Effect of methylprednisolone treatment on COVID-19: An inverse probability of treatment weighting analysis.

Lorenzo Porta, Sih-Shiang Huang, Chen Wei et al. · 2022 · PLoS ONE

Objectives While corticosteroids have been hypothesized to exert protective benefits in patients infected with SARS-CoV-2, data remain mixed. This study sought to investigate the outcomes of methylprednisone administration in an Italian cohort of hospitalized patients with confirmed SARS-CoV-2 infection. Methods Patients with confirmatory testing for SARS-CoV-2 were retrospectively enrolled from a tertiary university hospital in Milan, Italy from March 1st to April 30th, 2020 and divided into two groups by administration of corticosteroids. Methylprednisolone was administered to patients not r

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Negative / Null Result ReportOpen accessMedicine

Contribution of model organism phenotypes to the computational identification of human disease genes

Sarah M. Alghamdi, Paul N. Schofield, Robert Hoehndorf · 2022 · Disease Models & Mechanisms

Computing phenotypic similarity helps identify new disease genes and diagnose rare diseases. Genotype–phenotype data from orthologous genes in model organisms can compensate for lack of human data and increase genome coverage. In the past decade, cross-species phenotype comparisons have proven valuble, and several ontologies have been developed for this purpose. The relative contribution of different model organisms to computational identification of disease-associated genes is not fully explored. We used phenotype ontologies to semantically relate phenotypes resulting from loss-of-function mu

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Negative / Null Result ReportOpen accessMedicine

Availability of volunteer-led home-based care system and baseline factors as predictors of clinical outcomes in HIV-infected patients in rural Zambia.

Christopher B Estopinal, Janneke H van Dijk, Stanley Sitali et al. · 2012 · PLoS ONE

Background We assessed the impact of home-based care (HBC) for HIV+ patients, comparing outcomes between two groups of Zambians receiving antiretroviral therapy (ART) who lived in villages with and without HBC teams. Methods We conducted a retrospective cohort study using medical charts from Macha Mission Hospital, a hospital providing HIV care in Zambia's rural Southern Province. Date of birth, date of ART initiation, place of residence, sex, body mass index (BMI), CD4+ cell count, and hemoglobin (Hgb) were abstracted. Logistic regression was used to test our hypothesis that HBC was associate

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Negative / Null Result ReportOpen accessMedicine

Challenges and strategies in the soluble expression of CTA1-(S14P5)4-DD and CTA1-(S21P2)4-DD fusion proteins as candidates for COVID-19 intranasal vaccines.

Simson Tarigan, Gita Sekarmila, Apas et al. · 2024 · PLoS ONE

Developing intranasal vaccines against pandemics and devastating airborne infectious diseases is imperative. The superiority of intranasal vaccines over injectable systemic vaccines is evident, but developing effective intranasal vaccines presents significant challenges. Fusing a protein antigen with the catalytic domain of cholera toxin (CTA1) and the two-domain D of staphylococcal protein A (DD) has significant potential for intranasal vaccines. In this study, we constructed two fusion proteins containing CTA1, tandem repeat linear epitopes of the SARS-CoV-2 spike protein (S14P5 or S21P2), a

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Negative / Null Result ReportOpen accessMedicine

How safe and effective is oral analgesia for hip fracture patients? – a prospective cohort study

Zehra Abdul Muhammad, Tashfeen Ahmad · 2025 · Journal of the Pakistan Medical Association

Objective: To assess the safety and pain reduction profile of routinely prescribed oral analgesics in patients of hip fracture surgery. Method: The single-centre, prospective, cohort study was conducted from June 2022 to July 2023 at the Aga Khan University Hospital, Karachi and comprised adult patients of either gender with hip fractures. The analgesics prescribed at the time of hospital discharge and 1-week follow-up were recorded along with pain and adverse effects till the 2-week post-discharge follow-up. Pain was recorded using the visual analogue scale, with the target score set at 3/10.

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Negative / Null Result ReportOpen accessMedicine

Effects of executive function training on balance and auditory-cognitive dual-task performance in adults with and without hearing loss.

Niroshica Mohanathas, Lianna Montanari, Rachel Downey et al. · 2026 · PLoS ONE

Background Multitasking, such as listening while balancing, relies on integrated processing in the sensory, cognitive, and motor systems; systems that often decline with age. Hearing loss is linked to increased risks of both falls and cognitive decline. Improving cognitive processing through executive function (EF) training may support balance, especially in older adults with hearing loss. This randomized controlled study conducted across age groups and hearing abilities, examined the effects of a 12-week EF training program on postural outcomes (center of pressure (COP)) using an auditory-cog

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Negative / Null Result ReportMedicine

Preoperative blood spinal cord barrier biomarker levels correlate with neurological outcome in patients with degenerative cervical myelopathy one year after surgery: a prospective cohort study.

Schmidt TP, Jütten K, Bertram U et al. · 2026 · World neurosurgery

Degenerative cervical myelopathy (DCM) is the leading cause of chronic spinal cord dysfunction and can lead to severe neurological impairment if untreated. While decompressive surgery is the standard treatment, predicting postoperative…

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Negative / Null Result ReportMedicine

Statins May Not Reduce Reoperation Rates in Chronic Subdural Hematoma, Regardless of the Use of Antithrombotic Medication.

Klein J, Carl B, Schackert G · 2026 · Journal of neurological surgery. Part A, Central European neurosurgery

Objective Various studies have shown a beneficial effect of statins in patients with chronic subdural hematoma (cSDH) who do not require surgery. In surgical cohorts, however, the results of statin treatment in cSDH have been inconsistent,…

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Negative / Null Result ReportMedicine

Determination of the First Aid Knowledge Level of Teachers Working in Special Education and Rehabilitation Centers Regarding Tooth Avulsion.

Yabaş ŞM, Gümüşboğa ZŞ · 2026 · Dental traumatology : official publication of International Association for Dental Traumatology

Aim Tooth avulsion is among the traumatic dental injuries that require immediate intervention during childhood, and children are often with teachers or parents at the time of such incidents. This situation highlights the need to evaluate…

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Failed Experiment ReportMedicine

Designing a new "turtle" optotype for use with Aboriginal and Torres Strait Islander children.

Hopkins S, Banks E, Bentley SA et al. · 2026 · Optometry and vision science : official publication of the American Academy of Optometry

Purpose To evaluate whether luminance-matching of non-target elements (Study 1) and incorporating artwork (Study 2) within the newly designed turtle optotype would impact visual acuity (VA) measures. Methods Study 1 evaluated the…

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Negative / Null Result ReportMedicine

Nociception-guided opioid administration within multimodal analgesia for laparoscopic endometriosis surgery: a randomized controlled trial.

Buis HT, Berger-Estilita J, Zirngast S et al. · 2026 · Journal of clinical monitoring and computing

Women with endometriosis are at increased risk of severe postoperative pain due to nociceptive sensitization. While multimodal analgesia reduces opioid use, the added value of objective nociception monitoring remains unclear. This study…

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Negative / Null Result ReportMedicine

Influence of Cavity Design, Bonding-Banding Sequence, and Thermomechanical Loading on the Marginal Adaptation of Class II Resin Composite Restorations.

Ismail HS, Ali AI, Soliman HAN · 2026 · Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]

Objective To evaluate whether differences exist in marginal adaptation among beveled and non-beveled cavity designs, different bonding-banding sequences, and before and after thermomechanical loading. Methods Forty molars received…

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Negative / Null Result ReportMedicine

Causal Impact of Primary Care and Publicly Funded Health Insurance on Catastrophic Health Spending From Climate-Sensitive Diseases in India.

Chaudhary D, Mukhopadhyay I · 2026 · Applied health economics and health policy

Background Universal health coverage has become central to health policy debates, particularly as a strategy to protect households from financial hardship and impoverishment related to out-of-pocket (OOP) spending. Many low- and…

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Negative / Null Result ReportOpen accessMedicine

The mediating role of job and life satisfaction in the effect of psychological resilience on employee performance: evidence from the February 6 Kahramanmaraş (Türkiye) earthquakes.

Amırlı H, Gurbanli E · 2026 · BMC psychology

The purpose of this study is to investigate the mediating roles of job satisfaction (JS) and life satisfaction (LS) in the relationship between psychological resilience (PR) and employee performance (EP). Data for this study, which…

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Negative / Null Result ReportMedicine

The combined and independent influence of food texture and a 'mindful eating' instruction on eating rate and food intake among Dutch primary schoolchildren.

Jager G, de Wild VWT, Camps G et al. · 2026 · Appetite

Eating rate (ER), the amount of food consumed per unit of time, is a key determinant of food intake, with faster ER associated with larger meal size. Research in adults has shown that both sensory properties like texture, and instructions…

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