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Evidence-Based Content Flashcards

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Read the first 5 Evidence-Based Content flashcards as text

  1. A randomized controlled trial (RCT) studying the effectiveness of a new antihypertensive drug reports a relative risk (RR) of 0.75 (95% CI: 0.60โ€“0.90, ๐‘<0.05). What does this finding suggest?

    Answer: The drug reduces the risk of hypertension-related events by 25%.

    A relative risk (RR) of 0.75 means that the risk of hypertension-related events in the drug group is 75% of the risk in the control group. To find the percentage reduction in risk, subtract the RR from 1 (1 - 0.75 = 0.25). This indicates a 25% reduction in risk. The 95% confidence interval (0.60โ€“0.90) does not include 1, and the p-value is less than 0.05, confirming that this reduction is statistically significant.

  2. According to current guidelines, what is the first-line treatment for a 55-year-old male with newly diagnosed Stage 1 hypertension and no other comorbidities?

    Answer: Lifestyle modifications

    According to current hypertension guidelines (e.g., ACC/AHA), for a patient with newly diagnosed Stage 1 hypertension and no other comorbidities, lifestyle modifications are the recommended first-line treatment. These include dietary changes, regular physical activity, weight management, and limiting alcohol intake. Pharmacological therapy is typically initiated if lifestyle changes are insufficient after a certain period or if the patient has higher risk factors or Stage 2 hypertension.

  3. In evidence-based practice, what is the primary purpose of a likelihood ratio in diagnostic testing?

    Answer: To calculate the probability of disease after testing

    Likelihood ratios (LRs) are a key component in evidence-based practice for diagnostic testing. They quantify how much a positive or negative test result changes the probability of a disease. LRs are used to convert pre-test probability into post-test probability of disease, helping clinicians update their diagnostic certainty after a test is performed.

  4. A cohort study observes that patients who exercise regularly have a lower incidence of diabetes. Which of the following is true about this type of study?

    Answer: It measures the incidence of diabetes in an exposed and unexposed group.

    A cohort study is an observational study design where a group of individuals (a cohort) is followed over time. Researchers compare the incidence of a specific outcome (like diabetes) between a group exposed to a factor (e.g., regular exercise) and a group not exposed. While cohort studies can identify associations and measure incidence, they do not involve randomization and therefore cannot definitively establish causality like randomized controlled trials.

  5. A 40-year-old smoker is counseled on lung cancer prevention. What is the most effective intervention to reduce their risk of lung cancer?

    Answer: Smoking cessation

    Smoking is the leading preventable cause of lung cancer and many other serious health conditions. For a smoker, the single most effective intervention to significantly reduce their risk of lung cancer and improve overall health is to quit smoking. While other interventions like screening or diet can play a role, addressing the primary risk factor has the greatest impact on prevention.