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Open research questions in COVID-19 Clinical Research Studies

149 unresolved questions extracted from the limitations and future-work sections of 1,566 COVID-19 Clinical Research Studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • In addition, the safety evaluation was limited to a 7-day observation period; the long-term safety of combined TCM and Western medi- cine treatment remains to be further observed.

    A Cohort Study on Traditional Chinese Medicine Syndrome Differentiation-based Treatment for Post-COVID-19 Syndrome · 2026 · DOI

  • Future studies should conduct large-sample, multicenter rand- omized controlled trials with longer follow-up to verify the mid- to long-term efficacy of TCM syndrome differentiation-based treat- ment, collect objective indicators such as lung function to com- prehensively evaluate therapeutic effects, explore the underlying mechanisms through basic experiments, and adopt more rigorous study designs, including prospective registration and double-blind, placebo-controlled designs, to improve the quality of evidence.

    A Cohort Study on Traditional Chinese Medicine Syndrome Differentiation-based Treatment for Post-COVID-19 Syndrome · 2026 · DOI

  • Abstract Purpose Previous studies have reported contradictory findings about the possible association between SARS-CoV-2 and diabetes.

    Association between SARS-CoV-2 and diabetes: A population-based cohort study using the UK CPRD GOLD database · 2026 · DOI

  • Its potential additive role alongside glycaemic and immune variables warrants further exploration in predictive models of COVID-19 severity and outcomes. Additionally, as the study predates widespread COVID-19 vaccination, it does not account for vaccine-related effects on lipid and inflammatory profiles. As international studies have shown a positive correlation between higher BMI and severe COVID- 19 outcomes, this limited data availability prevented inclusion of BMI in the multivariate logistic regression model, and may have influenced the interpretation of metabolic risk relationships in this cohort.

    Serum lipids and outcomes of COVID-19 patients admitted to a tertiary hospital in Johannesburg, South Africa · 2026 · DOI

  • Available evidence suggests that clinically relevant post-COVID valvular abnormalities are more often secondary/functional (mitral and tricuspid regurgitation) than primary structural lesions, although dedicated prospective valvular studies remain scarce.

    Valvular Heart Disease and Heart Failure in the Post-COVID-19 Era: A Narrative Review of Mechanisms, Diagnosis, Differential Assessment, and Clinical Outcomes · 2026 · DOI

  • that should be considered when interpreting the results. First, the retrospective nature of the study may introduce biases related to data collection and patient selection. The reliance on hospital records and diagnostic tests could inaccurate data, have particularly status and regarding vaccination comorbidities. Second, the study only includes patients who presented the Emergency COVID-19 Outpatient Clinic of our hospital, which may not be representative of the broader population. As a result, the findings may not be generalizable patients, particularly those who did not seek care at this facility or those with milder symptoms who were not hospitalized or tested.

    Clinical Parameters Determining Mortality in COVID-19 Patients: Effects of PCR Positivity, Vaccination Status, Comorbidities and Thoracic CT Findings on Diagnosis and Treatment Process · 2026 · DOI

  • Objective Azvudine (FNC), an antiviral drug approved in China for the treatment of Coronavirus disease 2019 (COVID-19) infection, has not yet established a well-defined safety profile in patients with renal impairment.

    Safety profile of azvudine in COVID-19 patients with renal impairment: a retrospective analysis · 2026 · DOI

  • However, despite the demonstrated value of untargeted metabolomics in assessing severity, limited data exist on its use for identifying novel metabolite biomarkers that could improve both the sensitivity and specificity of outcome prediction.

    Clinical Study Protocol of the 'Biomarkers of Severity of COVID-19 Patients' (BIOMARCOVID) Project · 2026 · DOI

  • ARTICLE SUMMARYStrengths and limitations of this study O_LIBlood samples were collected within 48 hours of admission and before any severe symptom onset, aliquoted within 4 hours of collection and stored at -80{degrees}C, ensuring high pre-analytical quality.

    Clinical Study Protocol of the 'Biomarkers of Severity of COVID-19 Patients' (BIOMARCOVID) Project · 2026 · DOI

  • The exceptionally high ICU mortality rate (83.3%) observed in dialysis patients with COVID-19 compared to general COVID-19 ICU mortality (30-50%) suggests mechanistic differences, but the paper does not identify which specific factors—inability to tolerate mechanical ventilation, ventilator-associated complications, hemodynamic instability during dialysis, or multi-organ failure—are primary contributors. Mechanistic studies comparing ventilator tolerance, extracorporeal membrane oxygenation candidacy, and organ failure trajectories between dialysis and non-dialysis COVID-19 ICU patients are needed.

    Risk Factors for Severe Course and Mortality in Hemodialysis Patients with COVID-19 · 2026 · DOI

  • The retrospective design with small sample size and imbalanced gender distribution limits generalizability of findings on COVID-19 risk factors in hemodialysis patients. Prospective, multi-center studies with stratified enrollment by gender and matched control groups are needed to validate whether CRP cutoff thresholds and inflammatory marker profiles identified in this cohort apply to diverse hemodialysis populations.

    Risk Factors for Severe Course and Mortality in Hemodialysis Patients with COVID-19 · 2026 · DOI

  • D-dimer levels showed no statistically significant correlation with clinical outcomes in the study cohort, contrasting with literature showing D-dimer as a mortality risk factor in dialysis patients with COVID-19. The authors hypothesize this discrepancy may result from LMWH prophylaxis and dialysis clearance of D-dimer; controlled studies systematically measuring D-dimer at standardized timepoints relative to anticoagulation regimens and dialysis sessions are needed to clarify this mechanism in hemodialysis COVID-19 patients.

    Risk Factors for Severe Course and Mortality in Hemodialysis Patients with COVID-19 · 2026 · DOI

  • The clinical trajectory of COVID-19 is remarkably heterogeneous; patients presenting with high initial ΔNLR may recover with supportive care if the elevation is due to transient physiological stress or mild dehydration rather than progressive viral pathogenesis.

    The Prognostic Superiority of Early ΔNLR Variations in Predicting In-Hospital Mortality among Emergency and Ward Patients with COVID-19: A Systematic Review and Meta-Analysis · 2026 · DOI

  • Clinical algorithms utilizing the ΔNLR dynamic parameter must meticulously adjust for the exact timing and dosage of corticosteroid administration to prevent highly erroneous risk stratification, as corticosteroids artificially inflate positive delta variations through pharmacological mechanisms rather than advancing viral pathogenesis.

    The Prognostic Superiority of Early ΔNLR Variations in Predicting In-Hospital Mortality among Emergency and Ward Patients with COVID-19: A Systematic Review and Meta-Analysis · 2026 · DOI

  • During a comprehensive examination on the first day of hospitalization, we collected blood serum for further study of IFABP by enzyme-linked immunosorbent assay using the Human IFABP/FABP2 (Intestinal Fatty Acid Binding Protein) ELISA Kit (FineTest, China) with a working measurement range of 0.

    Correlation of IFABP levels with inflammatory markers in children with COVID-19 · 2025 · DOI

  • While several retrospective studies suggest a reduction in thrombotic events, mechanical ventilation, and mortality among patients receiving lowdose ASA, randomized trials report mixed results, including a modest reduction in hospitalization duration, but no significant impact on overall mortality.

    The role of acetylsalicylic acid in the prevention of thrombosis and its effect on the outcome of patients with COVID-19 · 2025 · DOI

  • To the Research Communities • A longitudinal study be done to better appreciate the full blood count changes and evaluate their prognostic significance among COVID-19 patients. • A case control study be done to evaluate the changes in dimers among COVID- 19 and non COVID-19 patients.

    The Full Blood Count and D-Dimers of Patients Infected with COVID-19 at the Bamenda Treatment Center · 2024 · DOI

  • Hydroxychloroquine is effective in reducing viral replication in COVID-19, but when administered, laboratory tests should be requested to avoid anemia, thrombocytopenia or leukopenia, and electrography to avoid QT interval prolongation or bradycardia.

    Risk Factors That Increases Covid-19 Severity · 2022 · DOI

  • Conflicting findings exist regarding whether baseline lymphocyte count or lymphocyte response to TCZ predicts mortality, with some studies showing statistical significance and others not.

    Clinical Predictors of Response to Tocilizumab: A Retrospective Multicenter Study · 2022 · DOI

  • Appearance of autoinflammatory and autoimmune phenomenon in patients with COVID-19 suggests that still its etiology and pathophysiology remains to be completely understood.

    COVID 19 and autoimmunity – A Review · 2021 · DOI

  • CONCLUSIONS: Liver injury expressed through liver function tests cannot solely constitute a prognostic factor for COVID-19 patients, but its presence in critically ill patients should be further investigated and included in future guideline protocols.

    Impact of the Severity of Liver Injury in COVID-19 Patients Admitted to an Intensive Care Unit During the SARS-CoV2 Pandemic Outbreak · 2021 · DOI

  • Furthermore, the radiographic dilemma of distinguishing between immune-checkpoint inhibitor-induced pneumonitis from that caused by SARS-CoV-2 infection and conflicting data on the effects of certain therapies on patient outcomes has left clinicians with considerable angst on how to help patients with acute or worsening symptoms in an optimal way.

    COVID-19 and oncological disease · 2021 · DOI

  • This finding strongly supports the need for further research on nicotine physiological pathway and its impact on COVID-19 infection whilst emphasizing that tobacco smoking should not be considered as efficient protection against COVID-19.

    Impact of Tobacco Smoking on the Risk of COVID-19: A Large Scale Retrospective Cohort Study · 2021 · DOI

  • No explicit discussion of whether the correlation between LDH and disease severity differs specifically in diabetic versus non-diabetic COVID-19 patients, limiting understanding of diabetes-specific complications.

    Beyond the Fingerstick: Complications of Diabetes in the Acutely Ill Patient with Covid-19 with Lessons from Translation Biology and Therapeutics · 2021 · DOI

  • The excerpt ends abruptly mid-sentence regarding prolonged prothrombin time and elevated lactate dehydrogenase findings, leaving incomplete analysis of these laboratory markers in COVID-19 patients with diabetes.

    Beyond the Fingerstick: Complications of Diabetes in the Acutely Ill Patient with Covid-19 with Lessons from Translation Biology and Therapeutics · 2021 · DOI

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149 open questions have been extracted from the limitations and future-work passages of 1,566 COVID-19 Clinical Research Studies papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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