A retrospective cohort study with adequate sample size and sound methodology demonstrating that myocardial work parameters detect cardiac dysfunction earlier than ejection fraction, but requiring prospective validation and external replication to confirm clinical utility.
Single-center retrospective observational study assessing appropriateness of thromboprophylaxis practice using a validated scoring tool, but without a comparator arm or intervention trial; findings are descriptive and hypothesis-generating rather than practice-testing.
Observational cohort study with hard clinical outcomes (mortality) in a large, nationally representative US sample, but dependent on cross-sectional exposure measurement and unable to establish causation; requires prospective validation.
Observational longitudinal cohort study using latent Markov modeling to identify dyslipidemia states and transition patterns; descriptive and associational findings without randomization or causal inference, suitable for hypothesis generation rather than clinical decision-making.
A single-centre retrospective study with prospective cardiac monitoring showing a high incidence of asymptomatic cardiotoxicity using contemporary biomarkers and strain imaging, but limited by retrospective design and lack of a control comparator.