INFORMATICS LA 5

functions as a pivotal nexus between computational technology, data analytics, and clinical practice

Pharmacy Informatics

evaluate the efficacy of Clinical Decision Support (CDS) tools, interpret real-world evidence from Electronic Health Records (EHRs), or implement predictive algorithms for pharmacovigilance

informatics pharmacists

A scientific investigation where researchers actively introduce an intervention or change (the independent variable) to observe its effect on an outcome (the dependent variable). It is the most reliable method for establishing true cause-and-effect relationships because it controls for outside factors 

Experimental Studies

A type of research where scientists collect data by observing subjects in their natural environment without interfering or assigning treatments. Because researchers do not manipulate variables, these studies are excellent for observing real-world trends but cannot definitively prove cause and effect.

Observational Studies

A clinical trial is a medical research study involving human volunteers designed to evaluate the safety and effectiveness of new drugs, medical devices, or behavioral treatments. A Randomized Clinical Trial (RCT) goes a step further, utilizing chance (randomization) to assign participants into different groups (e.g., an experimental treatment vs. a standard treatment or placebo)

Randomized Clinical Trial/ Clinical Trial

A research design used to evaluate the impact of an intervention without randomly assigning participants to groups. It measures an outcome before (pre-test) and after (post-test) the intervention is introduced, making it ideal for real-world scenarios where randomization is impractical or unethical.

Quasi-Experimental/ Pre-Post Studies

A research design that follows a group of similar individuals (a cohort) over a period of time. Researchers record participants' exposure to a suspected risk factor before any outcomes have occurred, and then track them forward into the future to see who develops the disease or condition being studied.

Prospective Cohort Studies

An observational research method that looks backward in time. Investigators identify a group of people (a cohort), define their historical exposure to a specific risk factor, and look through past records to determine whether they developed a specific health outcome or disease. 

Retrospective Cohort Studies

An observational study that compares a group of people with a specific disease or outcome (cases) to a similar group of people without it (controls). Researchers look back in time to identify and compare prior exposures to risk factors, helping them determine what factors might be associated with the condition.

Case-Control Studies

An observational research method that collects data from a defined population at a single point in time. It functions like a "snapshot," allowing researchers to measure the prevalence of specific outcomes, behaviors, or conditions and identify correlations without tracking participants over an extended period.

Cross-Sectional Studies

A detailed, narrative record of a single patient's medical history, symptoms, diagnosis, treatment, and follow-up. Primarily used in healthcare and medicine, it highlights unique occurrences—such as a rare disease, an unexpected treatment outcome, or a novel drug side effect—to share clinical insights with the medical community.

Case Reports

An observational, descriptive research design that tracks a group of patients with a similar condition, diagnosis, or treatment over a period of time. It lacks a control or comparison group and is primarily used to identify new trends, describe rare diseases, or generate hypotheses.

Case Series

A rigorous, transparent method that identifies, appraises, and synthesizes findings from multiple primary qualitative studies. Instead of analyzing numbers, it focuses on non-quantitative data—such as interviews, observations, and diaries—to explore human experiences, perceptions, and behaviors.

Qualitative Systematic Reviews

A statistical technique that combines quantitative data from multiple independent studies addressing the same research question. By pooling sample sizes and analyzing findings together, it calculates an average "effect size" to provide a more precise, reliable conclusion than any single study could achieve on its own.

Meta-Analysis

The statistical and quantitative evaluation of academic literature. Researchers use it to map the evolution of a field, evaluate scientific impact, identify prolific authors or institutions, and uncover hidden research trends across large datasets of scholarly publications. 

Bibliometric Analysis

Researchers extracted data from a national health registry from 2018 to 2024. They identified a cohort of Type 2 diabetic patients newly prescribed pioglitazone and an unexposed cohort prescribed other oral hypoglycemic agents. They analyzed the data forward through time to compare the subsequent long-term incidence of bladder cancer between the two groups, yielding a Hazard Ratio (HR) of 1.43 (95% CI, 1.12–1.84).

Retrospective cohort study

A hospital's infectious disease department implemented a strict restriction policy on the use of broad-spectrum carbapenems. Researchers measured the utilization rate of meropenem (measured in Defined Daily Doses [DDD] per 1,000 bed-days) during the 6 months before the policy and compared it to the utilization rate during the 6 months after the policy was enacted, finding a drop from 24.5 to 16.2 DDD per 1,000 bed-days.

Quasi-experimental research design

To evaluate the efficacy of a novel antihypertensive agent (Drug X), investigators randomly assigned 200 stage-2 hypertensive patients to receive either 20 mg of Drug X daily or 10 mg of amlodipine daily. After 12 weeks, the primary outcome showed a mean systolic blood pressure reduction of 14.2 mmHg in the Drug X group versus 11.5 mmHg in the amlodipine group (p<0.05).

Randomized controlled trial

In a winter 2025 study, investigators gathered data from 1,500 postmenopausal women during a single routine clinical visit. They measured concurrent serum 25-hydroxyvitamin D [25(OH)D] levels and femoral neck bone mineral density (BMD) to determine the nationwide prevalence of vitamin D deficiency and its immediate correlation with osteopenia. The data showed 42% of the sample had serum levels below 20 ng/mL.

Cross-sectional study

A regional toxicology center observed a sudden cluster of 8 patients presenting with acute hepatic failure within a two-week period. Investigators documented that all 8 patients had consumed a specific over-the-counter herbal weight loss supplement. The clinical report detailed their laboratory trends, including a mean alanine aminotransferase (ALT) peak of 1,250 U/L and total bilirubin of 5.8 mg/dL, to alert the medical community.

Case series

A regional toxicology center observed a sudden cluster of 8 patients presenting with acute hepatic failure within a two-week period. Investigators documented that all 8 patients had consumed a specific over-the-counter herbal weight loss supplement. The clinical report detailed their laboratory trends, including a mean alanine aminotransferase (ALT) peak of 1,250 U/L and total bilirubin of 5.8 mg/dL, to alert the medical community.

Case series

Oncologists reviewed historical chart data of 1,200 stage III colon cancer patients treated between 2018 and 2023. They divided the patients into two groups based on whether they had received Adjuvant Regimen A or Adjuvant Regimen B and compared their 5-year overall survival rates, which were 72% and 61% respectively (Log-rank p=0.03).

Retrospective cohort study

A pharmaceutical company monitored a group of 800 pregnant women who filled a prescription for a newly approved antiemetic drug during their first trimester. Investigators tracked the women through childbirth to record the incidence of congenital malformations, finding a baseline rate of 2.1% across 785 live births.

Prospective cohort study

Researchers conducted a comprehensive literature search across PubMed, Embase, and Cochrane databases for all peer-reviewed clinical trials investigating omega-3 fatty acid supplementation. They pooled data from 18 eligible trials comprising 24,000 total patients to mathematically calculate a single cumulative Relative Risk (RR) of 0.92 (p=0.02) for major adverse cardiovascular events.

Systematic review with Meta-analysis

Researchers conducted a structured literature review to evaluate the distinct mechanism-based toxicities of anti-PD-1 immunotherapy agents. They synthesized findings from 35 published clinical trials to outline common physiological pathways of immune-related adverse events, organizing the findings into a thematic text narrative without performing a statistical pooling of data.

Systematic review