The Practice of Medicine¶
Chapter 1 | Part 1: The Profession of Medicine
KEY CLINICAL POINTS¶
- The ultimate goals of medicine are disease prevention and, when disease occurs, early diagnosis and effective treatment—while maintaining a trusting patient-physician relationship
- The art of medicine (clinical judgment, intuition, experience) is as essential as the science of medicine (evidence-based knowledge, technology)
- Team-based care, electronic medical records, and the dichotomy between inpatient and outpatient medicine have transformed modern practice
- Precision medicine aims to tailor therapies based on genetic, biomarker, phenotypic, and psychosocial characteristics of individual patients
- Physicians must balance technological advances with humanistic care, maintaining professionalism and adapting to the era of 'omics' and globalized medicine
1. DEFINITION & OVERVIEW¶
The practice of medicine encompasses the application of scientific knowledge, technical skill, and human understanding to the care of patients. Since the first edition of Harrison's in 1950, molecular genetics, sophisticated imaging techniques, robotics, bioinformatics, and information technology have fundamentally changed how physicians define, diagnose, treat, and prevent disease. Two key principles remain constant: 1. The ultimate goal of medicine is to prevent disease and, when it occurs, to diagnose it early and provide effective treatment 2. A trusting relationship between physician and patient lies at the heart of effective patient care The patient is not merely a collection of symptoms, signs, disordered functions, damaged organs, and disturbed emotions—they are human, fearful, and hopeful, seeking relief, help, and reassurance.
1.1 The Science and Art of Medicine¶
Deductive reasoning and applied technology form the foundation for solving clinical problems. Advances in biochemistry, cell biology, immunology, and genomics provide windows into cellular function and disease mechanisms. Key scientific advances include: - Deciphering complex gene regulation mechanisms - Understanding how subtle changes in multiple genes affect cell and organism function - Appreciation of stem cells in tissue renewal, repair, cancer development, and treatment - Human microbiome research - Epigenetics and noncoding RNAs as regulatory features - Vaccine platform technology and cryo-electron microscopy for immunogen design - Machine learning and artificial intelligence for clinical predictive accuracy The art of medicine encompasses: - Identifying crucial elements in complex histories and physical examinations - Ordering appropriate tests and extracting key results - Deciding whether to treat or watch - Distinguishing relevant clinical clues from 'red herrings' - Weighing whether tests or treatments entail greater risk than the disease itself This combination of medical knowledge, intuition, experience, and judgment defines the art of medicine—equally necessary as a sound scientific base for precision medicine of the future.
2. CLINICAL SKILLS¶
Clinical skills form the foundation of medical practice, encompassing history-taking, physical examination, and diagnostic studies. These skills must be developed under direct observation and continuously refined throughout a physician's career.
Components of Comprehensive Clinical Assessment¶
| Component | Key Elements | Purpose |
|---|---|---|
| History-Taking | Chief complaint, HPI, PMH, medications, allergies, family history, social history, review of systems | Formulate differential diagnosis, understand patient context |
| Physical Examination | General appearance, vital signs, systematic head-to-toe examination | Identify physical signs confirming or revealing disease |
| Diagnostic Studies | Laboratory tests, imaging studies, specialized procedures | Confirm diagnosis, assess severity, guide treatment |
| Clinical Judgment | Integration of all data with medical knowledge and experience | Make informed decisions about diagnosis and treatment |
2.1 History-Taking¶
The recorded history should include all facts of medical significance in the patient's life, with recent events given most attention. Principles of effective history-taking: - Allow patients to tell their own story without frequent interruption - Provide expressions of interest, encouragement, and empathy - Recognize that any event, however trivial, may provide the key to diagnosis - Conduct a methodical review of systems to elicit features not mentioned in the narrative - Put the patient at ease to obtain more complete information Beyond symptoms, the physician gains valuable insight from: - Inflections of voice, facial expression, gestures, and body language - Patient's perception of and reaction to symptoms - Social history (types of diseases to consider, practical management considerations) - Family history (rare genetic disorders, common exposures, risk factors for coronary heart disease, hypertension, autoimmunity, cancers, asthma) The history provides opportunity to: - Establish or enhance the patient-physician bond - Develop appreciation of the patient's view of illness - Understand patient expectations - Assess financial and social implications Critical considerations: - Never rush the encounter—a hurried approach may cause patients to withhold information - Maintain confidentiality - Corroborate reported history when possible - An experienced clinician can usually formulate a relevant differential diagnosis from the history alone
2.2 Physical Examination¶
The purpose of the physical examination is to identify physical signs of disease. Significance is enhanced when findings confirm changes suggested by history. Principles of physical examination: - Should be methodical and thorough - Consider patient comfort and modesty - Extend from head to toe in an objective search for abnormalities - Record results at the time they are elicited, not hours later - Repeat as frequently as clinical situation warrants Skill development: - Learn under direct observation of experienced clinicians - Even experienced clinicians benefit from ongoing coaching and feedback - Simulation laboratories and standardized patients play increasing role Detection of findings (petechiae, faint murmurs, small masses) requires: - Keen eyes, ears, and sensitive fingers - A mind alert to potential findings Importance despite modern technology: - Should not be de-emphasized despite availability of sensitive diagnostic tests - Important clinical findings may escape detection by diagnostic tests - A thorough examination may render a laboratory finding unimportant (e.g., certain echocardiographic regurgitant lesions) - The hands-on examination offers opportunity for communication and has reassuring effects
2.3 Diagnostic Studies¶
Physicians rely increasingly on laboratory and imaging tests, but this does not relieve responsibility for careful observation and examination. Limitations to recognize: - Tests gain an aura of certainty regardless of fallibility of tests, instruments, and interpreters - Must weigh expense against value of information provided Test ordering principles: - Single tests are rarely ordered; batteries of tests are common - Batteries can be useful and cost-effective with single specimens - Abnormalities (e.g., hepatic function tests) may provide clues to nonspecific symptoms - Single abnormalities (e.g., elevated calcium) may point to specific diagnoses (hyperparathyroidism) Screening tests: - Most informative when directed toward common diseases - Results indicate whether other useful but costly tests/interventions are needed - Examples: LDL cholesterol measurement for early intervention Interpretation considerations: - Evaluate isolated abnormalities that may not connote significant disease - In-depth workup after isolated abnormality in otherwise well person often wasteful - With routine screening, some values normally fall slightly outside normal range or reflect physiologic variation - Repeat abnormal results to rule out laboratory error - Consider significance in context of patient condition and other results Imaging studies: - Continual development of improved studies with greater sensitivity and specificity - MRI, CT, ultrasonography, isotopic scans, and PET have supplanted older invasive approaches - Tempting to order battery of studies, but: - Patients must endure each test - Added cost of unnecessary testing is substantial - Investigation of unexpected findings may lead to iatrogenic complications - May diagnose irrelevant or incidental problems - Use judiciously—consider whether results will alter management and benefit patient
3. MANAGEMENT OF PATIENT CARE¶
Modern patient care involves complex systems of team-based care, transitions between settings, and careful attention to patient experience and outcomes.
Patient Care Transitions (Handoffs) Requiring Careful Communication¶
| Transition Type | Communication Requirements |
|---|---|
| Outpatient to Inpatient | Complete transfer of current medications, recent test results, active problems, code status preferences |
| Critical Care to General Floor | ICU course summary, active issues, pending results, downgrade criteria, escalation plan |
| Medical to Surgical Service | Medical history, active medical issues, medication reconciliation, perioperative risk assessment |
| Surgical to Medical Service | Operative details, postoperative complications, surgical follow-up needs, restrictions |
| Hospital to Home Hospital | Criteria for home care, monitoring requirements, escalation protocols, family support assessment |
| Hospital/Home Hospital to Outpatient | Discharge summary, pending results, follow-up appointments, medication changes, warning signs |
3.1 Team-Based Care¶
Medical practice has long involved teams, and advances in medicine have increased the ability to manage complex clinical situations. Team composition includes: - Physicians (primary care, hospitalists, intensivists, specialists, consultants) - Nurses, physician assistants, nurse practitioners - Physical therapists, pharmacists, respiratory therapists - Radiology technicians, social workers, dieticians - Transport personnel and others Communication principles: - Medical record communication is necessary but not sufficient for complex problems - Face-to-face or phone meetings ensure clear communication and thoughtful planning - Patients often receive or perceive different messages from various providers—strive for consistency - Management plans should be outlined succinctly and clearly Implications: - Important for medical culture, training, and health care system organization - Common values must be espoused and reinforced - Interprofessional teamwork now incorporated into medical school curricula - Balance efficiency with taking necessary time for direct communication with colleagues - Providers should introduce themselves, explain their role, and wear identifying information
3.2 Inpatient and Outpatient Medicine Dichotomy¶
The hospital environment has undergone sweeping changes over recent decades. Driving factors for change: - Evolution of emergency departments and critical care units for formerly fatal conditions - Pressure to reduce length of stay and manage complex disorders as outpatients - Efforts to reduce costs - New outpatient technologies (imaging, percutaneous infusion catheters, minimally invasive surgery) - Evidence that outcomes often improve by reducing inpatient hospitalization - Telehealth and remote monitoring tools Hospital levels of care: - Emergency department - Procedure rooms - Overnight observation units - Critical care units - Palliative care units - Traditional medical beds New specialties and roles: - Emergency medicine - End-of-life care - Hospitalists (board-certified internists limiting work to hospital setting) - Intensivists (board-certified in critical care medicine) Challenges: - Ensuring continuity of communication between primary care physicians and hospital care teams - Managing patient 'handoffs' (transitions between environments, units, services, hospital to home hospital, hospital to outpatient) - Maintaining the traditional one-to-one patient-physician relationship The 'medical home' concept incorporates team-based primary care with subspecialty care in a cohesive environment ensuring smooth transitions.
3.3 Mitigating the Stress of Acute Illness¶
Few people are prepared for new diagnoses of serious illness or the occurrence of acute events. The care of frightened or distraught patients is confounded by understandable responses to life-threatening events. Reducing shock of life-changing events: - Provide information in a clear, calm, consistent, and reassuring manner - Repeat information and reassurance as needed Hospital environment stressors: - Emergency rooms, operating rooms, ICUs, and general floors are intimidating - Patients surrounded by air jets, buttons, glaring lights - Invaded by tubes and wires - Beset by numerous health care team members - Transported to unfamiliar laboratories and imaging facilities - May be left unattended at times - May share rooms with other ill patients Consequences of hospitalization: - Additive effects of acute illness, unfamiliar environment, multiple medications, and sleep deprivation - Can lead to confusion or delirium, especially in elderly patients Physician approach: - Appreciate the hospital experience from patient's perspective - Make effort to guide and comfort the patient - May make stressful situation more tolerable - Enhance chances for optimal recovery Home-hospital care: - Represents an attempt to improve patient experience during uncomplicated acute illness - Provides care in familiar home surroundings - Mitigates stress of conventional hospitalization - May shorten recovery times
3.4 Medical Decision-Making¶
Medical decision-making is a fundamental responsibility occurring at each stage of diagnostic and therapeutic processes. Decision points include: - Ordering additional tests - Requesting consultations - Decisions about treatment - Predictions concerning prognosis Requirements: - In-depth understanding of pathophysiology and natural history of disease - Broad knowledge base for formulating differential diagnosis - Ability to assess relative probabilities of various diseases - Application of scientific method (hypothesis formulation, data collection) Iterative process: - As new information/test results acquired, differential diagnosis can be contracted or expanded - Evidence-based decisions preferred when rigorous clinical trial data available Evidence-Based Medicine: - Stands in sharp contrast to anecdotal experience (often biased) - Even experienced physicians can be unduly influenced by recent encounters with selected patients - Has led to publication of many useful practice guidelines - Only a fraction of clinical decisions have rigorous trial evidence—other recommendations based on expert consensus Clinical Judgment: - Good clinical judgment remains essential—difficult to quantify or assess qualitatively - Weighing known factors along with inevitable uncertainties - Particularly important when relevant evidence base unavailable Quantitative tools: - Diagnostic tests - Bayes' theorem (probability of event based on prior knowledge of related conditions) - Multivariate statistical models - Sensitivity (true-positive rate) and specificity (true-negative rate) - Predictive values of positive and negative results
3.5 Practice Guidelines¶
Many professional organizations and government agencies have developed formal clinical-practice guidelines. Purpose: - Aid physicians and caregivers in diagnostic and therapeutic decisions - Evidence-based, cost-effective, and appropriate to particular patient and situation Benefits: - Provide useful framework for managing patients with particular diagnoses or symptoms - Protect patients (especially those with inadequate benefits) from substandard care - Protect conscientious caregivers from inappropriate malpractice charges - Protect society from excessive costs of medical resource overuse Caveats: - Tend to oversimplify complexities of medicine - Groups with different perspectives may develop divergent recommendations (e.g., mammography screening, PSA testing) - Cannot account for uniqueness of each individual and their illness Physician challenge: Integrate useful expert recommendations without accepting them blindly or being inappropriately constrained by them.
3.6 Precision Medicine¶
Precision (or personalized) medicine reflects growing recognition that diseases can be stratified based on genetic, biomarker, phenotypic, and/or psychosocial characteristics distinguishing individual patients from others with similar presentations. Goal: Target therapies more specifically to improve clinical outcomes and minimize unnecessary side effects for those less likely to respond. Evolution: Represents evolution of clinical practice guidelines (usually developed for populations) as pathobiology, prognosis, and treatment responses of subgroups become better understood through: - Refined genomic analysis - Enhanced deep phenotyping Best-illustrated applications: - Cancers where genetic testing predicts responses to targeted therapies - Biomarkers including specific genetic alterations define disease subsets - Therapeutic approaches tailored to cellular pathobiology Validity: U.S. Food and Drug Administration certifies test validity based on clinical trial data. Future applications anticipated in: - Pharmacogenomics - Immunologic disorders - Diseases where biomarkers predict treatment responses
3.7 Evaluation of Outcomes¶
Clinicians generally use objective, readily measurable parameters to judge therapeutic intervention outcomes. Complexity: Measures may oversimplify clinical conditions—patients often present with major problems in context of multiple complicating background illnesses. Example: Patient with chest pain and cardiac ischemia with background of COPD and renal insufficiency. Outcome measures: - Mortality - Length of hospital stay - Readmission rates - Typically risk-adjusted Patient-centered considerations: Patients seek medical attention for subjective reasons—relief from pain, preservation/restoration of function, enjoyment of life. Health status/quality of life components: - Bodily comfort - Capacity for physical activity - Personal and professional function - Sexual function - Cognitive function - Overall perception of health Assessment methods: Structured interviews or specially designed questionnaires provide parameters for judging patients' subjective views of disabilities and responses to treatment. Practice requirement: Consideration and integration of both objective and subjective outcomes. Health system assessments: - HCAHPS surveys (publicly reported) - Patient satisfaction - Access to care - Communication with nurses and physicians - Social media feedback
4. ERRORS IN HEALTH CARE DELIVERY¶
Reports from the Institute of Medicine (now National Academy of Medicine) called for an ambitious agenda to reduce medical error rates and improve patient safety through fundamental changes in health care systems.
Key Safety Interventions to Reduce Medical Errors¶
| Error Type | Prevention Strategy | Implementation |
|---|---|---|
| Medication errors | Electronic ordering systems | CPOE with drug interaction alerts, barcode medication administration |
| Central line infections | Standardized insertion protocols | Trained personnel, checklists, regular line assessments, timely removal |
| Error Type | Prevention Strategy | Implementation |
|---|---|---|
| Catheter-associated UTIs | Standardized catheter protocols | Indication review, aseptic insertion, daily necessity assessment |
| Surgical site infections | Surgical safety checklists | Time-outs, antibiotic prophylaxis timing, sterile technique |
| Wrong-site surgery | Universal Protocol | Preoperative verification, site marking, time-out |
| Patient falls | Fall risk assessment | Sedative reduction, bed alarms, assisted ambulation, environmental modification |
4.1 System-Based Error Reduction¶
Responsibility: Hospitals and health care organizations must develop systems to reduce risk and ensure patient safety. Medication error reduction: - Ordering systems using electronic processes - When electronic options unavailable, systems eliminating misread handwriting - Systems highlighting important drug interactions Infection control: - Implementation of infection control systems - Enforcement of hand-washing protocols - Careful oversight of antibiotic use - Standardized protocols for central lines (introduction, maintenance, removal) - Standardized protocols for urinary catheters Surgical safety: - Standardized protocols and checklists reduce surgical infection and wrong-site surgery Fall prevention: - Judicious use of sedatives - Appropriate assistance with bed-to-chair and bed-to-bathroom transitions Physician responsibility: Use powerful therapeutic measures wisely, with due regard for beneficial actions, potential dangers, and cost. Impact: These measures save thousands of lives annually.
5. ELECTRONIC MEDICAL RECORDS¶
Information technology plays a central role in medicine, including efforts to reduce medical errors.
5.1 Advantages of EMRs¶
Features: - Rapid access to relevant data, historical and clinical information, imaging studies, laboratory results, medication records - Computerized order entry - Barcode tracking of medications - Interactive systems sending reminders or warning of potential errors Quality enhancement: - Monitor and reduce unnecessary variations in care - Provide real-time information about processes of care and clinical outcomes Ideal features: - Patient records easily transferred across health care system Limitations: - Technological constraints - Privacy concerns - Cost - Limit broad-based use in many settings
5.2 Challenges with EMRs¶
Provider-patient relationship: - Can create distance if care not taken to preserve face-to-face contact - Require training and time for data entry Documentation issues: - Significant time entering information for structured data and billing requirements - Pressure to take shortcuts (e.g., 'cutting and pasting' earlier notes) - Increased risk of errors - Information structured in manner disrupting traditional narrative flow Physician impact: - Growing sense of dissatisfaction - Lessening professional and personal well-being Balance required: Weigh frustrations against advantages of ready access to history, imaging, laboratory data, and consultant notes. Critical principle: Information technology is merely a tool—can never replace clinical decisions best made by the physician. Clinical knowledge and understanding of patient's needs, supplemented by quantitative tools, represent the best approach to medical decision-making.
6. THE PATIENT-PHYSICIAN RELATIONSHIP¶
"One of the essential qualities of the clinician is interest in humanity, for the secret of the care of the patient is in caring for the patient." —Francis W. Peabody, 1925 Physicians must remember that patients are individuals with problems that often transcend physical complaints. They are not 'cases' or 'admissions' or 'diseases.' Patients do not fail treatments; treatments fail to benefit patients.
Charter on Medical Professionalism: Core Principles¶
| Principle | Description |
|---|---|
| Primacy of Patient Welfare | Dedication to serving the interest of the patient; altruism contributes to trust central to patient-physician relationship |
| Patient Autonomy | Respect for patient autonomy; honest communication and empowerment of patients to make informed decisions |
| Social Justice | Promotion of justice in health care system including fair distribution of resources; work to eliminate discrimination |
6.1 Fundamental Principles¶
Approach to patients: - Most patients are anxious and fearful - Physicians should instill confidence and offer reassurance - Never appear arrogant, patronizing, impatient, or hurried - Professional attitude coupled with warmth and openness alleviates anxiety - Encourages patients to share all aspects of medical history - Empathy and compassion are essential features of a caring physician Considerations: - Physician must consider the setting of illness—patient's familial, social, and cultural backgrounds - Ideal relationship based on thorough knowledge of patient, mutual trust, and ability to communicate
6.2 Informed Consent¶
Fundamental principles of medical ethics: - Act in patient's best interest - Respect patient autonomy Informed consent requirements: - Patients sign consent forms for most diagnostic or therapeutic procedures - Physicians must communicate in clear and understandable manner - Fully discuss alternatives for care - Explain risks, benefits, and likely consequences of each alternative - Ensure patient thoroughly understands—encourage questions - May need to review issues multiple times - Continuing education of patient is essential Factors affecting understanding: - Many patients have limited medical knowledge - Fear of unknown commonly accompanies hospitalization - Fear of uncertain future and impact on self and family - Clear communication helps alleviate misunderstandings when complications occur Conflict of interest: Special care should ensure physician seeking consent has no real or apparent conflict of interest.
6.3 Approach to Grave Prognoses and Death¶
Key principle: Transparency of information, delivered appropriately, is essential in terminal illness. Patient awareness: - Even patients who seem unaware often have keen insights - May have misunderstandings leading to additional anxiety - Must be given opportunity to speak with physician and ask questions Communication approach: - Wise physician uses open communication to assess what patient wants to know and when - Based on responses, assess most appropriate time and pace for sharing information - Patient must ultimately understand expected course to make appropriate plans and preparations - Patient should participate in decision-making understanding goal (palliation) and likely effects - Consider patient's religious beliefs - Some patients share feelings more easily with physician, nurses, or clergy than family Physician responsibilities: - Provide or arrange for emotional, physical, and spiritual support - Be compassionate, unhurried, and open - Consider benefits of laying on of hands - Control pain adequately - Maintain human dignity - Avoid isolation from family and friends Goal shift: In terminal illness, goal must shift from cure to care. "Primum succurrere" (first to help) is the guiding principle. Family considerations: - Provide information to family members - Deal with grief and feelings of guilt or anger - Assure family that everything reasonable is being done - Acknowledge prognostic uncertainty - Ensure consistent information from all health care team members - Seek advice from palliative and terminal care experts when appropriate
6.4 Maintaining Humanism and Professionalism¶
Trends making care feel impersonal: 1. Vigorous efforts to reduce escalating health care costs 2. Growing managed-care programs with limited physician choice 3. Increasing reliance on technology and computerization 4. Need for numerous providers to care for seriously ill patients 5. Growth of telemedicine and virtual encounters with physical limitations Charter on Medical Professionalism (ABIM, ACP-ASIM, EFIM): Three main principles in physicians' contract with society: 1. Primacy of patient welfare 2. Patient autonomy 3. Social justice Personal attributes: - Integrity - Respect - Compassion Characteristics of humane physician: - Availability to patient - Expression of sincere concern - Willingness to take time explaining all aspects of illness - Nonjudgmental attitude when dealing with patients whose cultures, lifestyles, attitudes, and values differ Challenging patients: - Some patients evoke strongly negative or positive emotional responses - Physicians should be alert to own reactions - Consciously monitor and control behavior - Patient's best interest must remain principal motivation - Implicit bias training can assist with these skills Quality of life assessment: - Subjective assessment of what each patient values most - Requires detailed, sometimes intimate knowledge of patient - Obtained through candid, unhurried, often repeated conversations - Time pressures threaten but should not diminish these interactions - Patient encounter should focus on patient, not distractions like EMR displays
7. EXPANDING FRONTIERS IN MEDICAL PRACTICE¶
The practice of medicine continues to evolve with advances in science, technology, and global interconnectedness.
Overview of 'Omic' Sciences in Medicine¶
| Field | Focus | Clinical Applications |
|---|---|---|
| Genomics | Complete set of genes and their functions | Disease risk assessment, pharmacogenomics, precision medicine |
| Epigenetics | Heritable changes in gene expression not due to DNA sequence changes | Cancer biology, developmental disorders, aging |
| Proteomics | Complete set of proteins expressed by genome | Biomarker discovery, drug targets, disease classification |
| Microbiomics | Microbial communities inhabiting the body | Infectious disease, obesity, immune disorders, mental health |
| Metabolomics | Complete set of metabolites in biological systems | Metabolic disorders, disease biomarkers, drug metabolism |
| Exposomics | Environmental exposures throughout life | Environmental disease links, prevention strategies, public health |
7.1 The Era of 'Omics'¶
The complete sequencing of the human genome (2003) officially ushered in the genomic era. Medical practice has evolved from insights into human and microbial genomes. Clinical implications: - Complete genome sequencing of H1N1 influenza (2009) - Rapid sequencing of COVID-19 (early 2020) enabling swift vaccine development - Gene expression profiles guide therapy and inform prognosis - Genotyping assesses disease risk and drug response variations Key 'omic' fields: Genomics: - Use of complex genomics in diagnosis, prevention, and treatment still early - Phenotypes determined by genes, gene products interactions, and gene-environment interplay Epigenetics: - Study of alterations in chromatin, histone proteins, and DNA methylation (often caused by environmental factors) influencing gene expression - Every cell has identical DNA; diverse phenotypes result from epigenetic regulation - Alterations associated with cancers and other diseases Proteomics: - Study of entire library of proteins made in cell or organ - Complex relationship of proteins to disease - Proteins generated through alternate splicing, posttranslational processing and modifications - Presence/absence of proteins being explored for diagnostic and screening applications Microbiomics: - Study of resident microbes (microbiome) - Human genome: ~23,000 genes; microbiome: >3-4 million genes - Resident microbes significant for host health status - Critical role in immune system maturation, metabolic balance, brain function, disease susceptibility - Environmental factors (antibiotic use/overuse) linked to obesity, metabolic syndrome, atherosclerosis, immune-mediated diseases Metagenomics: - Genomic study of environmental species potentially influencing human biology - Example: Farm environment microorganism exposures and lower asthma incidence in farm children Metabolomics: - Study of range of metabolites in cells or organs and alterations in disease - Aging may leave metabolic footprints predicting organ dysfunction and disease - Disease patterns likely to be found in lipids, carbohydrates, membranes, mitochondria Exposomics: - Study of exposome—environmental exposures (smoking, sunlight, diet, exercise, education, violence) - Enormous impact on health Challenges: - New information challenges traditional reductionist medical thinking - Variability of results and large number of variables create challenges in identifying preclinical disease - Systems biology and network medicine being applied to 'big data' - May provide new approaches to classifying, diagnosing, treating, and preventing disease Physician role: - Ensure powerful technologies applied judiciously to patient care - Engage in continuous learning - Genetic testing requires wise counsel based on understanding value, limitations, and implications
7.2 The Globalization of Medicine¶
Physicians should be cognizant of diseases and health care services beyond local boundaries. Global considerations: - Global travel has critical implications for disease spread - Diseases endemic to certain regions seen in other regions after travel - Example: Zika virus infections in the Americas Contributing factors to changing disease profiles: - Wars - Migration of refugees - Travel patterns - Impact of increasing climate extremes Patient access: - Broader access to unique expertise or clinical trials at distant medical centers - Travel cost may be offset by quality of care Internet transformation: - Transfer of medical information worldwide - Transfer of technological skills through telemedicine - International consultation (e.g., radiologic image interpretation, pathologic specimens)
7.3 Medicine on the Internet¶
The Internet has had a positive effect on medical practice overall. Benefits for physicians: - Wide range of information available almost instantaneously - Access from anywhere in the world - Current information, practice guidelines - State-of-the-art conferences, journal content, textbooks - Direct communications with other physicians and specialists - Expanded depth and breadth of diagnostic and care information - Online medical journals providing rapid new information - Lessens information gap for physicians in remote areas Patient use: - Acquiring information about illnesses and therapies - Joining Internet-based support groups - Often arrive at visits with sophisticated information - Physicians challenged positively to keep abreast - Physicians serve as information 'editors' as patients navigate Critical caveat: - Virtually anything can be published, circumventing peer review - Both physicians and patients must be aware of this danger - Adverse consequences of misinformation and disinformation in social media - Deceptions preventing COVID-19 vaccine acceptance caused immeasurable harm Despite limitations: Appropriate use revolutionizes information access—a remarkable resource not available a generation ago.
7.4 Public Expectations and Accountability¶
Public knowledge and sophistication regarding health issues has grown rapidly. Expectations of physicians: - Master rapidly advancing fields (science) - Consider patients' unique needs (art) - Technical aspects of care - Patient satisfaction with delivery and costs Accountability measures: - Meeting standards prescribed by federal and local governments - Utilization review of hospitalized patients (government and third-party payers) - Physician must defend cause and duration of hospitalization outside 'average' standards - Reimbursement increasingly based on documented nature and complexity of illness Pay-for-performance movement: - Seeks to link reimbursement to quality of care - Goal: Improve standards and contain spiraling costs Managed care: - Capitated contracts replaced traditional fee-for-service in many areas - Places onus of cost management directly on providers - Increases emphasis on preventive strategies Competence demonstration: - Mandatory continuing education - Patient record audits - Maintenance of certification - Relicensing
7.5 Medical Ethics and New Technologies¶
Rapid technological advances have profound implications for medical applications beyond traditional goals. Emerging technologies: - Cloning - Gene therapy - Gene editing - Human-computer interfaces - Nanotechnology - Targeted therapies Potential applications: - Modify inherited disease predispositions - Select desired embryo characteristics - Augment 'normal' human performance - Replace failing tissues - Substantially prolong life span Physician responsibility: - Help shape debate on appropriate uses and limits - Consider carefully ethical issues with implementation - Shared decision-making increasingly important (genetic counseling, end-of-life care, diagnostic and treatment options)
8. LEARNING MEDICINE¶
Over a century since the Flexner Report transformed medical education, emphasizing scientific foundations and clinical skill acquisition.
Competency Domains in Modern Medical Education¶
| Domain | Description |
|---|---|
| Patient Care | Provide compassionate, appropriate, and effective care |
| Medical Knowledge | Demonstrate knowledge of established and evolving biomedical, clinical, and cognate sciences |
| Practice-Based Learning and Improvement | Investigate and evaluate patient care practices, appraise and assimilate scientific evidence |
| Interpersonal and Communication Skills | Demonstrate skills that result in effective information exchange and teaming with patients, families, and professionals |
| Professionalism | Demonstrate commitment to professional responsibilities, adherence to ethical principles, sensitivity to diverse patient populations |
| Domain | Description |
|---|---|
| Systems-Based Practice | Demonstrate awareness of and responsiveness to larger context of health care, ability to call on system resources |
8.1 Modern Medical Education¶
In an era of burgeoning information, many schools are implementing new curricula. Emphases: - Lifelong learning - Acquisition of competencies in: - Teamwork - Communication skills - System-based practice - Professionalism Evolving tools requiring formal training: - Electronic medical records - Large datasets - Ultrasound - Robotics - New imaging techniques Curriculum goals: Provide foundation for physicians to progress from competency to proficiency to mastery.
8.2 Training Hour Restrictions¶
Increasing pressures have led to implementation of training time restrictions. Rationale: - Benefits of continuity of care and patient observation over time - Outweighed by stresses from long hours - Fatigue-related errors ACGME parameters: - Introduced to reduce fatigue and enhance learning - Impact still being assessed - Continual efforts to optimize training - Movement toward competency-based endpoints Consequence—increased handoffs: - Unavoidable by-product of fewer bedside hours - Transitions must be handled with care and thoroughness - All relevant information must be exchanged and acknowledged Challenge: Establishing reliable measures of physician effectiveness.
8.3 The Physician as Perpetual Student¶
From medical school graduation, it becomes apparent that this milestone is symbolic—physicians must embrace being 'perpetual students.' Emotional response: - Exhilarating: Can apply constantly expanding knowledge to patient treatment - Anxiety-provoking: Will never know as much as wanted or needed Ideal approach: - Translate quest for excellence into continuing learning - Not place reliance on comfortable mastery of finite knowledge Maintaining competence: - Medicine remains imperfect art - Long tradition of continuing education - Physicians at every stage of training expected to maintain up-to-date habits - Willingness to accept criticism and correct deficiencies through study
9. KEY POINTS & CLINICAL PEARLS¶
Essential takeaways for medical practice from this foundational chapter.
Clinical Pearls: The Practice of Medicine¶
| Topic | Key Point |
|---|---|
| Patient-Centered Care | The secret of the care of the patient is in caring for the patient—empathy and compassion are essential |
| History-Taking | An experienced clinician can usually formulate a relevant differential diagnosis from the history alone |
| Physical Examination | A thorough hands-on examination may render a laboratory finding unimportant and fosters the patient-physician relationship |
| Diagnostic Tests | Use tests judiciously—consider whether results will alter management and benefit the patient |
| Evidence-Based Medicine | Only a fraction of clinical decisions have rigorous trial evidence; good clinical judgment remains essential |
| Practice Guidelines | Integrate expert recommendations without accepting them blindly or being inappropriately constrained |
| Communication | Clear, consistent communication among providers is essential, especially during transitions of care |
| Error Prevention | Standardized protocols and checklists for procedures, medications, and infections save thousands of lives annually |
| Terminal Illness | In terminal illness, the goal must shift from cure to care—'Primum succurrere' (first to help) |
| Informed Consent | Ensure patient thoroughly understands risks, benefits, and alternatives—encourage questions |
| EMRs | Information technology is merely a tool—can never replace clinical decisions best made by the physician |
| Lifelong Learning | Physicians must embrace being perpetual students, translating quest for excellence into continuing learning |
| Professionalism | Three principles: primacy of patient welfare, patient autonomy, and social justice |
| Precision Medicine | Aims to tailor therapies based on individual genetic, biomarker, phenotypic, and psychosocial characteristics |
| Global Awareness | Be cognizant of diseases beyond local boundaries—global travel has critical implications for disease spread |