Medicine Study Guide

📖 Core Concepts Medicine – science & practice of caring for patients (diagnosis, prognosis, prevention, treatment, palliation) while promoting health. Modern scientific basis – uses biomedical sciences, genetics, technology, drugs, surgery, devices, biologics, radiation. Clinical encounter – starts with record review → medical interview → physical exam → documentation. Levels of care – Primary (first contact), Secondary (specialist after referral), Tertiary (complex/urgent care). Evidence‑Based Medicine (EBM) – integrates best research evidence with clinical expertise & patient values; only ½ of interventions have solid evidence. Medical ethics principles – Autonomy, Beneficence, Non‑maleficence, Justice, Respect for persons, Truthfulness/Honesty. 📌 Must Remember Chief complaint: patient’s own words + duration. Vital signs: height, weight, temperature, BP, pulse, RR, SpO₂. Four physical exam techniques – Inspection, Palpation, Percussion, Auscultation. Differential diagnosis: rule‑out process based on history, symptoms, exam. Non‑maleficence = “first, do no harm.” Autonomy vs. Beneficence conflict – e.g., patient refuses life‑saving transfusion. Delivery levels – know which services belong to primary, secondary, tertiary care. 🔄 Key Processes Initial Patient Encounter Review record → Conduct interview (CC, HPI, ROS, PMH, meds, FH, SH) → Perform physical exam (systematic inspection → palpation → percussion → auscultation) → Document. Medical Interview Workflow Ask CC → Clarify duration → Explore HPI chronologically → Review systems → Gather meds & allergies → Record past, family, social histories. Physical Exam Sequence General appearance → Vital signs → System‑by‑system (HEENT, cardio, resp, abdomen, neuro, etc.) using the four techniques. Diagnostic Process Generate differential → Order targeted tests (labs, imaging, biopsies) → Refine diagnosis → Plan treatment. 🔍 Key Comparisons Primary vs. Secondary vs. Tertiary Care Primary: first contact, broad scope, preventive & routine. Secondary: specialist referral, ambulatory/inpatient, diagnostics & surgeries. Tertiary: highly specialized, complex/rare conditions (transplant, trauma, burn). Inspection vs. Palpation vs. Percussion vs. Auscultation Inspection: visual cues (color, shape, movement). Palpation: texture, temperature, tenderness. Percussion: sound/ resonance → organ size, fluid. Auscultation: acoustic signals (heart, lung, bowel). ⚠️ Common Misunderstandings “Chief complaint” is not a diagnosis – it’s the patient’s quoted reason, not the clinician’s impression. Physical exam techniques are interchangeable – each yields distinct information; e.g., percussion cannot replace auscultation for heart sounds. Evidence‑based = perfect evidence – many interventions lack strong data; always weigh quality of evidence. Autonomy overrides all – can be limited when patient lacks decision‑making capacity or poses public health risk. 🧠 Mental Models / Intuition “SAMPLE” mnemonic for interview – Symptoms, Allergies, Medications, Past history, Last oral intake, Events (family/social). “OPQRST” for pain/HPI – Onset, Provocation, Quality, Radiation, Severity, Timing. “VITALS” as a quick health bar – think of each sign as a game stat that must stay within normal “range” for optimal performance. 🚩 Exceptions & Edge Cases Non‑maleficence violation – providing unproven therapy without consent or transparency. Vital sign outliers – e.g., fever may be absent in immunocompromised patients; do not rely solely on temperature. Differential diagnosis – rare diseases may mimic common ones; keep “zebra” in mind when presentation is atypical. 📍 When to Use Which Choose level of care – if problem is routine/preventive → Primary; if specialist knowledge needed → Secondary; if complex surgery/organ failure → Tertiary. Select physical exam technique – use inspection first; palpation for masses/tenderness; percussion for organ size/air/fluid; auscultation for functional sounds. Apply ethical principle – autonomy for elective procedures; beneficence when patient is incapacitated; justice when allocating scarce resources. 👀 Patterns to Recognize Chronological HPI pattern – symptoms often start subtly, progress, and may have aggravating/relieving factors. Vital sign clustering – tachycardia + hypotension = possible shock; fever + leukocytosis = infection. Family history red flags – early‑onset cardiovascular disease → consider hereditary hyperlipidemia. 🗂️ Exam Traps Distractor: “Chief complaint = diagnosis” – exam will test you on quoting the patient’s words, not your impression. Trap: “All physical exam steps are optional” – missing any technique can lose points; they’re each required for a complete exam. Misleading answer: “Primary care provides surgery” – only minor procedures; major surgeries belong to secondary/tertiary. Ethics vignette: selecting “autonomy always wins” ignores cases where capacity is lacking; the correct choice balances autonomy with beneficence and safety. --- Study this guide repeatedly; the bullets are intentionally concise to let you recall details quickly under exam pressure.