This Is Why with Dr. Busti

Dr. Busti explains how to read a normal 12-lead ECG using a clear, repeatable approach to systematic ECG interpretation. Follow one real ECG through seven steps: Quality → Rate → Rhythm → Axis → Intervals → Waveforms → Final interpretation. For medical students, residents and other healthcare learners, this Medical Rounds lesson connects the tracing with the electrical activity behind it. Explanat...

Dr. Busti explains furosemide (Lasix) PO to IV dose conversion and why the appropriate Lasix IV dose depends on the patient's clinical state and treatment goal. For a stable patient who still needs maintenance diuresis but temporarily cannot take oral medication, the approximate 2:1 oral-to-IV conversion can provide a starting estimate. Treating heart failure exacerbation due to fluid overloa...

PRISMA 2020 and AMSTAR-2 are two important tools for evaluating how systematic reviews are reported and critically appraised. In this episode of This Is Why with Dr. Busti, you'll learn how reporting guidelines and critical appraisal tools help clinicians determine whether a published systematic review was reported completely and conducted using trustworthy methods.  Understanding these frame...

GRADE is one of the most widely used systems for evaluating the quality and certainty of evidence in systematic reviews and meta-analyses. In this episode of This Is Why with Dr. Busti, you'll learn how the GRADE approach helps clinicians determine how much confidence they should place in published evidence before changing clinical practice.  Using a real-world example from Cochrane reviews,...

Dr. Busti will explain gallbladder anatomy and gallbladder physiology, connecting bile flow and gallstones to the clinical findings healthcare professionals encounter in practice. Follow bile from hepatic production through gallbladder storage, concentration, and meal-triggered release. Learn how cholecystokinin coordinates delivery, how the cystic duct connects the gallbladder to the common bile...

Forest plots are an important tool in evidence-based medicine, yet many clinicians can recognize one without confidently interpreting what it is actually showing. In this episode of This Is Why with Dr. Busti, you'll learn how to read a forest plot, understand what each component represents, and evaluate what a meta-analysis is telling you about the evidence.  You'll also learn how confi...

Systematic reviews and meta-analyses are often considered among the highest levels of clinical evidence—but only when they are performed using rigorous, transparent methods. In this episode of This Is Why with Dr. Busti, you'll learn the essential steps involved in conducting and critically evaluating a systematic review and meta-analysis, from developing a focused clinical question through a...

Systematic Review vs Meta-Analysis is one of the most commonly misunderstood topics in evidence-based medicine. In this episode of This Is Why, Dr. Busti explains the important differences between review articles, systematic reviews, and meta-analyses, why these terms should not be used interchangeably, and how each contributes to clinical decision-making. #SystematicReview #MetaAnalysis #Evidence...

Dr. Busti explains why the PARADIGM-HF trial changed treatment for heart failure with reduced ejection fraction (HFrEF), connecting sacubitril/valsartan to the clinical evidence behind angiotensin receptor-neprilysin inhibitor (ARNI) therapy. Why replace an ACE inhibitor in a patient who seems stable? Follow the rationale for neprilysin inhibition, the role of natriuretic peptides, and the reason...

Trimethoprim-sulfamethoxazole, or TMP-SMX, and spironolactone can impair renal potassium excretion through different mechanisms. This lecture explains how trimethoprim’s amiloride-like inhibition of ENaC converges with mineralocorticoid-receptor antagonism—and why that can increase the risk of clinically important hyperkalemia. Dr. Busti will explain how normal distal-nephron potassium handling wo...

The amiodarone and digoxin drug interaction is one of the most clinically important cardiovascular drug interactions to understand because it can raise digoxin exposure and increase the risk of digoxin toxicity. In this episode of This Is Why, Dr. Busti explains why amiodarone can increase digoxin concentrations, how P-glycoprotein inhibition changes digoxin handling, and why clinicians should ant...

Likelihood ratios (LR) are one of the most clinically useful tools in diagnostic testing because they help clinicians determine whether a test meaningfully changes the probability of disease. In this episode of This Is Why with Dr. Busti, Dr. Anthony Busti explains how likelihood ratios integrate sensitivity, specificity, prevalence, and post-test probability into real-world clinical decision-maki...

Positive and negative predictive values are critical for understanding what diagnostic test results actually mean in clinical practice. In this episode of This Is Why with Dr. Busti, Dr. Busti explains how predictive values help clinicians determine the probability that a patient truly has — or does not have — a disease after diagnostic testing. This Is Why understanding predictive values matters...

ROC curves and the AUC (or c-statistic) are some of the most important — and most misunderstood — concepts in diagnostic testing and evidence-based medicine (EBM). In this episode of This Is Why with Dr. Busti, Dr. Busti explains how ROC curves help clinicians determine diagnostic test cutoffs, balance sensitivity and specificity, and improve diagnostic accuracy in real clinical practice. This Is...

Sensitivity and specificity are some of the most misunderstood concepts in evidence-based medicine and diagnostic testing. In this episode of This Is Why with Dr. Busti, Dr. Busti breaks down the clinical meaning behind sensitivity, specificity, true positives, false positives, false negatives, and diagnostic accuracy using practical examples clinicians can immediately apply. This Is Why understan...

Diagnostic tests used in research and clinical practice are essential to evidence-based medicine because they shape how clinicians diagnose disease, interpret tests, and make patient care decisions. In this episode of This Is Why with Dr. Busti, Dr. Busti explains how the precision and accuracy of diagnostic studies are designed, validated, and critically appraised using clinically relevant exampl...

Diagnostic studies are foundational to evidence-based medicine because they help clinicians determine disease presence, severity, progression, and treatment response. In this episode of This Is Why with Dr. Busti, Dr. Busti explains the essential framework behind diagnostic studies, including sensitivity, specificity, predictive values, likelihood ratios, and critical appraisal tools used to evalu...

Regression analysis explained — understanding how variables influence outcomes is essential for interpreting clinical research in this episode of This Is Why with Dr. Busti. Dr. Busti breaks down regression analysis and how it helps identify relationships between variables while controlling for confounders. This Is Why mastering regression allows you to determine whether an intervention truly driv...

Tamsulosin for kidney stones is one of the most commonly prescribed therapies for ureteral stones — but does it actually help? In this episode of This Is Why with Dr. Busti, we break down the landmark SUSPEND trial and explain why the answer depends on the patient, the stone size, and the clinical context. This Is Why many clinicians changed how they approach medical expulsive therapy after SUSPEN...

Epistaxis explained by Dr. Busti. In this episode on This Is Why, we break down why epistaxis happens, how clinicians think through causes of bleeding, and why the location of bleeding matters clinically. Dr. Busti explains anterior vs posterior epistaxis, common risk factors, medication-related bleeding, vascular anatomy, and when recurrent nosebleeds may signal a more serious underlying conditio...

Effect size (Relative risk vs odds ratio vs hazard ratio & NNT and NNH explained — This Is Why understanding these concepts is essential for interpreting clinical trials with Dr. Busti. In this episode of This Is Why, Dr. Busti breaks down relative risk (RR), odds ratios (OR), absolute risk reduction (ARR), absolute risk increase (ARI), number needed to treat (NNT), and number needed to harm (...

D-dimer explained for DVT evaluation. This Is Why healthcare professionals must understand what an elevated D-dimer actually means before jumping to conclusions. Dr. Busti walks through a common deep vein thrombosis scenario and explains why compression ultrasonography—not automatic anticoagulation—is the correct next step when DVT is suspected. Many learners incorrectly assume that an elevated D-...

Stroke thrombolysis changed emergency neurology forever—but understanding why the NINDS trial mattered is what transforms memorization into clinical decision-making. In this episode of This Is Why with Dr. Busti, we break down the landmark NINDS rt-PA trial that established alteplase as a treatment for acute ischemic stroke and explore the real-world balance between functional recovery and intrace...

Confidence intervals are one of the most misunderstood concepts in evidence-based medicine. In this episode of This Is Why with Dr. Busti, we break down what 95% confidence intervals actually mean, how they relate to p values and effect size, and why they are essential for interpreting clinical research correctly. Dr. Busti walks through practical examples involving odds ratios, hazard ratios, rel...

Tinnitus explained clearly—This Is Why it matters clinically with Dr. Busti. Understanding tinnitus as a symptom, not a diagnosis, changes how you think, communicate, and manage patients. In this episode, Dr. Busti breaks down the meaning of tinnitus, its clinical implications, and how proper terminology drives better clinical reasoning. From pathophysiology to medication causes and key descriptor...