14.2 Acute Chest Pain Risk Stratification & Triage

ABFM Family Medicine Certification Study Guide Exam

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1 Chapter 1: Exam Structure, Blueprint & Clinical Decision-Making

1.1 Exam Blueprint, FMCLA vs. One-Day Exam & Board Scoring 1.2 Clinical Reasoning, Test-Taking Strategy & Ambiguity Management 1.3 Evidence-Based Medicine & Clinical Practice Guidelines in Primary Care

2 Chapter 2: Healthcare Systems, Practice Management & Quality

2.1 Practice Management, Billing, Coding & Documentation 2.2 Quality Improvement, Patient Safety & Diagnostic Stewardship 2.3 Interprofessional Team-Based Care & Care Coordination

3 Chapter 3: Ethics, Law, Biostatistics & Health Equity

3.1 Medical Ethics, Informed Consent & Surrogate Decision-Making 3.2 Biostatistics, Clinical Epidemiology & Diagnostic Test Interpretation 3.3 Social Determinants of Health, Health Equity & Cultural Humility 3.4 Physician Wellness, Burnout Prevention & Professionalism

4 Chapter 4: Lifestyle Counseling & Behavior Change

4.1 Alcohol Use Screening & Brief Intervention 4.2 Illicit Drug & Cannabis Counseling 4.3 Tobacco & Vaping Cessation Counseling

5 Chapter 5: Nutrition, Physical Activity & Chronic Disease Prevention

5.1 Dietary Counseling for Obesity & Chronic Disease Prevention 5.2 Exercise Prescription & Physical Activity Counseling 5.3 Genetic Risk Assessment & Family History Counseling

6 Chapter 6: Routine Adult Immunizations

6.1 ACIP Adult Respiratory Vaccines: Influenza, COVID-19, RSV & Pneumococcal 6.2 ACIP Adult Non-Respiratory Vaccines: Tdap, Shingrix, HPV & Hep B 6.3 Immunizations in Special Populations: Pregnancy, Asplenia & Immunocompromise

7 Chapter 7: Pediatric Health Maintenance & Surveillance

7.1 Newborn Examination & Early Postnatal Care 7.2 Well-Child Care, Developmental Surveillance & Milestones 7.3 Pediatric & Adolescent Screening: Vision, Hearing, Anemia & Lead 7.4 Pediatric Oral Health, Dental Screening & Fluoride

8 Chapter 8: Behavioral Health & Safety Screening

8.1 Primary Care Depression, Anxiety & Behavioral Health Screening 8.2 Domestic Violence, Intimate Partner Violence & Firearm Safety 8.3 Occupational Health & Recreational Safety Counseling

9 Chapter 9: Adult Preventive Screening: Cardiovascular & Metabolic

9.1 Cardiovascular Disease & Hypertension Screening 9.2 Type 2 Diabetes Screening & Prediabetes Risk Stratification 9.3 Abdominal Aortic Aneurysm & Osteoporosis Screening

10 Chapter 10: Adult Cancer Screening: Breast & Gynecologic

10.1 Breast Cancer Screening & Risk-Assessment 10.2 Cervical Cancer Screening & ASCCP Algorithms 10.3 Skin Cancer Clinical Assessment & Counseling

11 Chapter 11: Adult Cancer Screening: Colorectal, Lung & Prostate

11.1 Colorectal Cancer Screening Modalities & Intervals 11.2 Lung Cancer Screening with Low-Dose CT 11.3 Prostate Cancer Screening & Shared Decision-Making

12 Chapter 12: Sexual Health, Infectious Disease Screening & Contraception

12.1 Sexual Health Counseling & Risk-Reduction Strategies 12.2 STI Screening: Chlamydia, Gonorrhea, Syphilis & Trichomoniasis 12.3 Bloodborne Infectious Disease Screening: HIV & Hepatitis C

13 Chapter 13: Reproductive Life Planning, Lactation & Preoperative Care

13.1 Preconception Planning & Comprehensive Contraception Management 13.2 Lactation Support & Breastfeeding Counseling 13.3 Preoperative Medical Evaluation & Pre-Participation Sports Exam

14 Chapter 14: Emergent Cardiovascular Conditions

14.1 Acute Coronary Syndromes & Myocardial Infarction 14.2 Acute Chest Pain Risk Stratification & Triage 14.3 Acute or Critical Valvular Heart Emergencies

15 Chapter 15: Cardiac Arrhythmias, Heart Failure & Hypertensive Crises

15.1 Acute Atrial & Ventricular Arrhythmias 15.2 Acute Decompensated Heart Failure & Cardiogenic Shock 15.3 Hypertensive Emergency & Urgency Management

16 Chapter 16: Vascular & Thromboembolic Emergencies

16.1 Pulmonary Embolism & Deep Vein Thrombosis 16.2 Acute Aortic Syndromes & Peripheral Vascular Emergencies 16.3 Critical Limb Ischemia & Acute Arterial Occlusion

17 Chapter 17: Neurologic Emergencies: Stroke & Altered Consciousness

17.1 Acute Ischemic Stroke & Intracranial Hemorrhage 17.2 Syncope Evaluation & Status Epilepticus 17.3 Acute Delirium, Encephalopathy & Severe Confusion

18 Chapter 18: Neurologic Trauma & Acute Cranial Emergencies

18.1 Concussion, Moderate-to-Severe TBI & Intracranial Injury 18.2 Thunderclap & Acute Severe Secondary Headaches 18.3 Acute Ophthalmologic Emergencies

19 Chapter 19: Acute Abdominal, Pelvic & Gastrointestinal Emergencies

19.1 Acute Abdominal & Pelvic Pain Triage 19.2 Upper & Lower Gastrointestinal Bleeding 19.3 Acute Hepatic Failure, Cholangitis & Severe Jaundice

20 Chapter 20: Acute Pulmonary & Airway Emergencies

20.1 Acute Hypoxic Respiratory Failure & ARDS 20.2 Severe Community-Acquired Pneumonia & Empyema 20.3 Acute Severe Epistaxis & Airway Obstruction

21 Chapter 21: Acute Traumatic Injuries & Wound Care

21.1 Major Trauma Resuscitation & Initial Assessment 21.2 Burn Assessment, Inhalation Injury & Resuscitation 21.3 Laceration Management, Complex Wounds & Animal Bites

22 Chapter 22: Acute Orthopedic & Musculoskeletal Emergencies

22.1 Acute Ambulatory Fractures & Initial Splinting 22.2 Compartment Syndrome & Major Orthopedic Trauma 22.3 Septic Arthritis & Acute Microcrystalline Crises

23 Chapter 23: Severe Infections, Sepsis & Systemic Emergencies

23.1 Sepsis, Septic Shock & Initial Fluid Resuscitation 23.2 Necrotizing Soft Tissue Infections & Severe CNS Infections 23.3 Anaphylaxis Diagnosis, Epinephrine Dosing & Airway Protection

24 Chapter 24: Metabolic, Endocrine & Electrolyte Emergencies

24.1 Diabetic Ketoacidosis & Hyperosmolar Hyperglycemic State 24.2 Critical Electrolyte Emergencies: Dyskalemias & Dysnatremias 24.3 Severe Calcium Abnormalities & Acute Adrenal Crisis

25 Chapter 25: Hematologic, Urologic & Dental Emergencies

25.1 Severe Symptomatic Anemias & Coagulopathic Emergencies 25.2 Testicular Torsion, Priapism & Acute Urinary Retention 25.3 Urgent Odontogenic Infections & Dental Trauma

26 Chapter 26: Psychiatric, Behavioral & Obstetric/Gynecologic Emergencies

26.1 Suicidal Ideation, Acute Agitation & Behavioral Emergencies 26.2 Acute Physical & Sexual Assault Care 26.3 Life-Threatening Vaginal Bleeding & Ectopic Pregnancy 26.4 Environmental Heat Stroke & Severe Hypothermia

27 Chapter 27: Acute Head, Neck & Neurologic Symptoms

27.1 Primary Acute Headaches: Migraine, Tension & Cluster 27.2 Concussion & Minor Closed Head Injury Evaluation 27.3 Transient Ischemic Attack Evaluation & ABCD2 Risk Scoring

28 Chapter 28: Acute Cranial Nerves, Hearing & Sensory Symptoms

28.1 Peripheral Neuropathies: Bell's Palsy, Carpal Tunnel & Radiculopathy 28.2 Acute Tinnitus, Sudden Sensorineural Hearing Loss & Cerumen Impaction 28.3 Acute Dizziness, Benign Paroxysmal Positional Vertigo & Vestibular Neuritis

29 Chapter 29: Acute Upper Respiratory Tract Infections

29.1 Acute Viral Rhinosinusitis vs. Bacterial Rhinosinusitis 29.2 Acute Pharyngitis: Group A Streptococcus & Centor Criteria 29.3 Acute Otitis Media, Otitis Externa & Serous Effusion

30 Chapter 30: Acute Lower Respiratory Infections & Cough

30.1 Influenza, COVID-19 & Viral Respiratory Syndromes 30.2 Acute Bronchitis & Lower Respiratory Tract Infections 30.3 Ambulatory Community-Acquired Pneumonia

31 Chapter 31: Allergic, Nasal & Non-Infectious Pulmonary Conditions

31.1 Allergic Rhinitis & Acute Non-Anaphylactic Allergic Reactions 31.2 Acute Dyspnea in Ambulatory Care 31.3 Interstitial Lung Diseases & Sarcoidosis Presentation

32 Chapter 32: Acute Chest, Cardiac & Vascular Symptoms

32.1 Palpitations Evaluation & Arrhythmia Triage in Primary Care 32.2 Deep Vein Thrombosis & Superficial Thrombophlebitis 32.3 Ambulatory Hypotension & Orthostasis Evaluation

33 Chapter 33: Acute Upper Gastrointestinal Conditions

33.1 Peptic Ulcer Disease & Gastritis 33.2 Dysphagia, Esophagitis & Acute Esophageal Disorders 33.3 Acute Nausea, Vomiting & Foodborne Illness

34 Chapter 34: Acute Lower Gastrointestinal Conditions

34.1 Acute Infectious Diarrhea & Gastroenteritis 34.2 Acute Constipation & Functional Bowel Changes 34.3 Ano-Rectal Disorders: Hemorrhoids, Fissures, Abscesses & Pruritus Ani

35 Chapter 35: Inflammatory, Functional & Malabsorptive GI Disorders

35.1 Acute Flares of Inflammatory Bowel Disease 35.2 Irritable Bowel Syndrome: Diagnosis, Subtyping & Management 35.3 Celiac Disease & Malabsorption Syndromes

36 Chapter 36: Acute Abdominal, Hepatic & Biliary Disorders

36.1 Ambulatory Abdominal & Pelvic Pain Triage 36.2 Acute Cholecystitis, Biliary Colic & Pancreatitis 36.3 Acute Liver Injury & Viral Hepatitis

37 Chapter 37: Acute Abdominal Wall, Hernias & Dental Conditions

37.1 Abdominal Wall, Inguinal & Ventral Hernias 37.2 Acute Dental Pain, Odontogenic Abscess & Aphthous Ulcers 37.3 Acute Edema: Unilateral vs. Bilateral Diagnostic Evaluation

38 Chapter 38: Acute Infectious Dermatoses

38.1 Bacterial Skin Infections: Impetigo, Cellulitis & Cutaneous Abscesses 38.2 Fungal Skin Infections: Tinea Corporis, Cruris, Pedis & Onychomycosis 38.3 Viral Cutaneous Infections: Herpes Simplex, Zoster & Molluscum Contagiosum

39 Chapter 39: Inflammatory, Allergic & Autoimmune Dermatoses

39.1 Atopic Dermatitis, Contact Dermatitis & Eczematous Flares 39.2 Non-Infectious Rashes: Urticaria, Drug Eruptions & Erythema Multiforme 39.3 Cutaneous Malignancies & Premalignant Lesions: AK, BCC, SCC & Melanoma

40 Chapter 40: Acute Shoulder, Elbow & Upper Extremity Injuries

40.1 Rotator Cuff Pathology, Tendinopathy & Shoulder Impingement 40.2 Lateral & Medial Epicondylitis, Olecranon Bursitis & Elbow Sprains 40.3 Wrist & Hand Soft-Tissue Injuries: De Quervain, TFCC & Finger Sprains

41 Chapter 41: Acute Knee, Ankle & Lower Extremity Injuries

41.1 Meniscal Tears, Ligamentous Knee Injuries & Patellofemoral Pain 41.2 Ankle Sprains, Ottawa Ankle Rules & Achilles Tendinopathy 41.3 Plantar Fasciitis, Shin Splints & Overuse Syndromes

42 Chapter 42: Acute Ambulatory Fractures & Dislocations

42.1 Distal Radius, Scaphoid & Common Upper Extremity Fractures 42.2 Metatarsal, Clavicle & Common Lower Extremity Fractures 42.3 Joint Dislocation Management: Nursemaid's Elbow & Shoulder Subluxation

43 Chapter 43: Acute Axial Musculoskeletal Pain & Falls

43.1 Acute Low Back Pain: Red Flags, Strain & Disc Herniation 43.2 Acute Cervical Strain, Whiplash & Axial Neck Pain 43.3 Evaluation of Falls in Ambulatory & Older Patients

44 Chapter 44: Acute Inflammatory Arthropathies & Generalized Pain

44.1 Acute Inflammatory Arthritis & Spondyloarthropathies 44.2 Myalgias, Rhabdomyolysis & Post-Viral Pain Syndromes 44.3 Acute Non-Headache Pain Management Strategies

45 Chapter 45: Acute Renal, Urinary & Genitourinary Conditions

45.1 Uncomplicated UTI, Pyelonephritis & Acute Urethritis 45.2 Hematuria Workup & Glomerulonephritis 45.3 Nephrolithiasis & Acute Urinary Tract Obstruction

46 Chapter 46: Acute Male Genitourinary & Prostatic Conditions

46.1 Acute Prostatitis, Epididymitis & Orchitis 46.2 Acute Scrotal Pain: Torsion vs Appendage, BPH & Male Genital Emergencies 46.3 Acute Urinary Retention & Incontinence Evaluation

47 Chapter 47: Acute Women's Health & Early Pregnancy Care

47.1 Early Pregnancy Diagnosis, Dating & Initial Complications 47.2 Abnormal Uterine Bleeding & Acute Menstrual Disorders 47.3 Premenstrual Syndrome & Premenstrual Dysphoric Disorder

48 Chapter 48: Breast Disorders, STIs & Pediatric Elimination

48.1 Palpable Breast Mass, Mastitis & Nipple Discharge 48.2 Sexually Transmitted Infections: Diagnosis, Staging & CDC Guidelines 48.3 Pediatric Enuresis & Encopresis

49 Chapter 49: Systemic Signs, Metabolic Dysregulation & Miscellaneous Infections

49.1 Acute Fever, Sepsis Screening & FUO in Primary Care 49.2 Acute Hyperglycemia & Symptomatic Hypoglycemia 49.3 Electrolyte Abnormalities: Mild-to-Moderate Disturbances 49.4 Vector-Borne, Tick-Borne & Rickettsial Illnesses

50 Chapter 50: Chronic Cardiovascular Diseases: Hypertension & Ischemia

50.1 Essential Hypertension Management: 2025 AHA/ACC Guideline & JNC Strategies 50.2 Chronic Coronary Artery Disease & Post-MI Secondary Prevention 50.3 Chronic Heart Failure: HFrEF, HFpEF & Quadruple GDMT

51 Chapter 51: Chronic Vascular, Valvular & Dyslipidemic Diseases

51.1 Peripheral Arterial Disease & Claudication 51.2 Chronic Valvular Heart Disease & Murmur Evaluation 51.3 Lipid Disorders & ASCVD Risk-Based Statin Therapy

52 Chapter 52: Chronic Respiratory Diseases: Asthma & COPD

52.1 Chronic Asthma Management: GINA Stepwise SMART Therapy 52.2 Chronic Obstructive Pulmonary Disease: GOLD Recommendations 52.3 Solitary Pulmonary Nodule Evaluation & Fleischner Society Criteria

53 Chapter 53: Chronic Metabolic Diseases: Diabetes Mellitus

53.1 Type 2 Diabetes Management: ADA Pharmacotherapy Algorithms 53.2 Type 1 Diabetes: Basal-Bolus Insulin, CGMs & Diabetic Complications 53.3 Diabetic Microvascular & Macrovascular Disease Surveillance

54 Chapter 54: Obesity, Nutrition & Metabolic Bone Diseases

54.1 Medical & Behavioral Management of Obesity & Incretin Mimetics 54.2 Osteoporosis & Metabolic Bone Disease: DEXA, FRAX & Antiresorptives 54.3 Nutritional Deficiencies: Vitamin D, B12, Iron & Malnutrition

55 Chapter 55: Chronic Endocrine Disorders

55.1 Primary & Subclinical Hypothyroidism, Hyperthyroidism & Nodules 55.2 Adrenal Disorders: Addison's Disease & Cushing's Syndrome 55.3 Hypercalcemia, Hyperparathyroidism & Pituitary Disorders

56 Chapter 56: Chronic Kidney Disease & Venous Disorders

56.1 Chronic Kidney Disease: KDIGO Staging & Renoprotective Therapy 56.2 Chronic Venous Insufficiency, Stasis Dermatitis & Lymphedema 56.3 Chronic Electrolyte & Acid-Base Management in CKD

57 Chapter 57: Chronic Gastrointestinal & Hepatic Diseases

57.1 Gastroesophageal Reflux Disease, Barrett's Esophagus & Dyspepsia 57.2 Chronic Liver Disease: MASLD/NAFLD, Cirrhosis & Portal Hypertension 57.3 Viral Hepatitis B & C: Long-Term Monitoring & DAA Therapy

58 Chapter 58: Colorectal Surveillance & Chronic Pancreaticobiliary Care

58.1 Post-Polypectomy Colorectal Polyp Surveillance Guidelines 58.2 Chronic Pancreatitis & Exocrine Pancreatic Insufficiency 58.3 Chronic Nausea, Gastroparesis & Functional GI Disorders

59 Chapter 59: Chronic Musculoskeletal & Rheumatologic Disorders

59.1 Osteoarthritis: Hip, Knee & Hand Management 59.2 Spinal Conditions: Spinal Stenosis, Spondylolisthesis & Compression Fractures 59.3 Chronic Myopathies & Fibromyalgia Syndrome

60 Chapter 60: Chronic Neurologic & Neurodegenerative Disorders

60.1 Dementia: Alzheimer's, Vascular & Lewy Body Disease 60.2 Parkinson's Disease & Essential Tremor 60.3 Epilepsy: Chronic Antiseizure Medications & Post-Stroke Care

61 Chapter 61: Chronic Peripheral Nerves, Pain & Sensory Disorders

61.1 Diabetic & Chronic Peripheral Neuropathies 61.2 Chronic Pain Syndromes & Chronic Daily Headaches 61.3 Chronic Tinnitus, Presbycusis & Persistent Dizziness

62 Chapter 62: Chronic Psychiatric Disorders

62.1 Major Depressive Disorder & Generalized Anxiety Disorder 62.2 Bipolar Disorder: Maintenance Pharmacotherapy & Lithium Monitoring 62.3 Adult & Pediatric Attention-Deficit/Hyperactivity Disorder

63 Chapter 63: Chronic Behavioral Health & Neurodevelopmental Conditions

63.1 Chronic Behavioral Conditions: PTSD, OCD & Somatization 63.2 Autism Spectrum Disorder & Intellectual Disabilities 63.3 Eating Disorders: Anorexia Nervosa, Bulimia & Binge Eating

64 Chapter 64: Chronic Substance Use Disorders & Tobacco Cessation

64.1 Alcohol Use Disorder: Pharmacotherapy & Relapse Prevention 64.2 Opioid & Stimulant Use Disorders: MOUD & Harm Reduction 64.3 Longitudinal Tobacco Cessation Pharmacotherapy

65 Chapter 65: Chronic Dermatologic Conditions

65.1 Acne Vulgaris, Rosacea & Seborrheic Dermatitis 65.2 Chronic Plaque Psoriasis & Biologic Therapies 65.3 Chronic Eczema, Hidradenitis Suppurativa & Cutaneous Lupus

66 Chapter 66: Chronic Reproductive, Infectious & Geriatric Special Care

66.1 Chronic Menstrual Disorders, Infertility & Sexual Dysfunction 66.2 Menopause Management & Hormone Replacement Therapy 66.3 Chronic HIV Infection Management & Primary Care Integration 66.4 Gender-Affirming Primary Care & Hormone Therapy 66.5 Advance Care Planning, Palliative Care & End-of-Life Symptom Control

67 Chapter 67: Continuity Care: Sleep, Fatigue, Cancer, Pregnancy & the Adult Preventive Visit

67.1 Chronic Insomnia & Obstructive Sleep Apnea 67.2 Chronic Malaise, Fatigue & ME/CFS 67.3 Primary Care During Cancer Treatment & Survivorship 67.4 Routine Prenatal Care & Longitudinal Pregnancy Management 67.5 The Periodic Adult Health Examination & Medicare Annual Wellness Visit

14.2 Acute Chest Pain Risk Stratification & Triage

Key Takeaways Explain This Topic AI

The HEART score (History, ECG, Age, Risk factors, Troponin; scale 0-10) categorizes acute chest pain into low risk (0-3; <1.7% 30-day major adverse cardiac event [MACE] rate, eligible for early discharge and outpatient evaluation), intermediate risk (4-6; 12-16% MACE, requiring observation and non-invasive testing), and high risk (7-10; >50% MACE, mandating urgent invasive coronary angiography).

Pain radiating to both arms or shoulders carries the highest positive likelihood ratio (+LR ~2.6-4.1) for acute myocardial infarction, while a completely normal initial 12-lead ECG lowers the probability (-LR ~0.1-0.3) but never excludes acute coronary ischemia.

The 'Big 5' thoracic life threats—Acute Coronary Syndrome, Acute Pulmonary Embolism, Acute Aortic Dissection, Tension Pneumothorax, and Esophageal Rupture (Boerhaave syndrome)—must be systematically evaluated and ruled out in every patient presenting with acute chest discomfort.

Acute aortic dissection must be suspected with tearing or ripping interscapular back pain maximal at onset, accompanied by a pulse deficit or >20 mm Hg systolic blood pressure disparity between arms; Stanford Type A requires emergent surgical repair, whereas uncomplicated Type B is managed in the ICU targeting heart rate <60 bpm and SBP 100-120 mm Hg with IV beta-blockers prior to vasodilators.

Benign primary care chest pain etiologies—including costochondritis, GERD, and pre-eruptive herpes zoster—are strictly diagnoses of exclusion; reproducible chest wall tenderness occurs in 10% to 15% of confirmed acute myocardial infarctions and must never override objective risk stratification.

Last updated: September 2026

Clinical Triage of Acute Chest Pain

Chest pain accounts for over 6.5 million emergency department visits and millions of primary care encounters annually in the United States. The primary clinical challenge in family medicine and acute care triage is the rapid, accurate identification of life-threatening cardiovascular and pulmonary emergencies while avoiding unnecessary hospitalizations and invasive procedures for benign non-cardiac conditions.

The First 10 Minutes: Immediate Priorities

Immediate Resuscitation & Vital Signs : Assess airway, breathing, circulation, and vital signs (blood pressure in both arms, heart rate, respiratory rate, ambient oxygen saturation).

12-Lead Electrocardiogram : Must be acquired and interpreted by a physician within 10 minutes of patient presentation to identify STEMI, STEMI equivalents (LBBB, Sgarbossa criteria, De Winter T waves, Wellens syndrome), acute pericarditis, or severe dysrhythmias.

Targeted History & Physical Exam : Characterize symptom onset (sudden vs gradual), quality (tearing, pressure, pleuritic), radiation, duration, aggravating/alleviating factors, and associated symptoms (diaphoresis, dyspnea, nausea, syncope).

• Evidence-Based Clinical Risk Stratification Scores
• The HEART Score

The HEART score is the most extensively validated clinical decision rule for risk-stratifying emergency department and acute ambulatory chest pain. It predicts the 30-day incidence of Major Adverse Cardiac Events (MACE) —defined as acute myocardial infarction, percutaneous coronary intervention, coronary artery bypass grafting, or all-cause mortality.

• Component Clinical Findings / Parameters Points Assigned
• H - History Highly suspicious for ischemia (retrosternal pressure, radiation to both arms, diaphoresis) 2
• Moderately suspicious (atypical features mixed with typical ischemic symptoms) 1
• Slightly or non-suspicious (sharp, fleeting, pleuritic, or positional pain) 0
• E - ECG Significant ST-segment depression (>= 0.5 mm) or pathological T-wave inversions 2
• Non-specific repolarization disturbance, bundle branch block, or ventricular pacing 1
• Completely normal 12-lead ECG 0
• A - Age >= 65 years 2
• 45 to 64 years 1
• < 45 years 0

R - Risk Factors >= 3 risk factors (hypertension, hyperlipidemia, DM, smoking, family history CAD <55/65y, BMI >30) OR documented CAD/PAD/stroke 2

• 1 or 2 cardiac risk factors 1
• No known cardiovascular risk factors 0
• T - Troponin > 3x local laboratory 99th percentile upper reference limit 2
• 1 to 3x 99th percentile upper reference limit 1
• <= 99th percentile upper reference limit (normal) 0
• Risk Stratification & Clinical Action Protocols

Low Risk (HEART Score 0 to 3) :

30-Day MACE Rate : < 1.7% .

Management : Highly eligible for early discharge directly from the emergency department or clinic without inpatient admission. Outpatient non-invasive evaluation (stress echocardiography, coronary CTA, or exercise treadmill test) may be scheduled electively within 72 hours as clinically appropriate.

Intermediate Risk (HEART Score 4 to 6) :

30-Day MACE Rate : 12% to 16.6% .

Management : Warrants observation unit admission, serial high-sensitivity cardiac troponins at 0 and 1–3 hours, continuous telemetry, and inpatient non-invasive testing (coronary CTA or provocative stress testing) prior to discharge.

High Risk (HEART Score 7 to 10) :

30-Day MACE Rate : 50% to 65% .

Management : Mandates urgent inpatient hospital admission, continuous cardiac monitoring, aggressive medical therapy (aspirin, P2Y12 inhibitor, parenteral heparin), urgent cardiology consultation, and early invasive coronary angiography.

TIMI and GRACE Risk Scores

TIMI Risk Score for UA/NSTEMI : Evaluates 7 independent predictors (1 point each: Age >= 65, >= 3 CAD risk factors, known CAD stenosis >= 50%, aspirin use in last 7 days, severe angina >= 2 episodes in 24h, ST deviation >= 0.5 mm, elevated cardiac biomarkers). Scores 0–2 represent low risk (5–8% 14-day death/MI/urgent revascularization), 3–4 intermediate risk (13–20%), and 5–7 high risk (26–41%).

GRACE Risk Score : Complex multivariable model (incorporating age, heart rate, systolic BP, serum creatinine, Killip heart failure class, cardiac arrest at admission, ST deviation, and elevated biomarkers) calculating in-hospital and 6-month post-discharge mortality. A GRACE score > 140 indicates high risk requiring an early invasive strategy within 24 hours.

The "Big 5" Thoracic Life Threats: Systematic Evaluation

Every clinician evaluating acute chest pain must methodically evaluate and exclude the five fatal thoracic conditions: THE "BIG 5" THORACIC KILLERS

• ┌────────────────────────────────────────────────────────────────────────────────────────┐
• │ 1. ACUTE CORONARY SYNDROMES (STEMI / NSTEMI / Unstable Angina) │
• │ • Pathophysiology: Atherosclerotic plaque rupture + coronary thrombosis │
• │ • Exam: Diaphoresis, S3/S4 gallop, hypotension, bilateral arm radiation │
• │ • Workup: 12-lead ECG within 10 minutes, serial high-sensitivity troponins │
• └────────────────────────────────────────────────────────────────────────────────────────┘
• ┌────────────────────────────────────────────────────────────────────────────────────────┐
• │ 2. ACUTE PULMONARY EMBOLISM (PE) │
• │ • Pathophysiology: DVT dislodgement occluding pulmonary arterial vasculature │
• │ • Exam: Tachycardia, tachypnea, clear lungs, unilateral calf swelling, cyanosis │
• │ • Workup: Wells score -> PERC rule or age-adjusted D-dimer -> CTPA │
• └────────────────────────────────────────────────────────────────────────────────────────┘
• ┌────────────────────────────────────────────────────────────────────────────────────────┐
• │ 3. ACUTE AORTIC DISSECTION │
• │ • Pathophysiology: Intimal tear propagating through aortic media │
• │ • Exam: Sudden tearing back pain, pulse deficit, inter-arm SBP delta >20, AR murmur │
• │ • Workup: Contrast-enhanced chest/abdo/pelvis CTA (stable) or TEE (unstable) │
• └────────────────────────────────────────────────────────────────────────────────────────┘
• ┌────────────────────────────────────────────────────────────────────────────────────────┐
• │ 4. TENSION PNEUMOTHORAX │
• │ • Pathophysiology: One-way pleural valve -> high intrapleural pressure -> SVC collapse │
• │ • Exam: Absent breath sounds, hyperresonance, JVD, hypotension, tracheal deviation │
• │ • Workup: CLINICAL DIAGNOSIS -> immediate needle decompression (do NOT wait for CXR!) │
• └────────────────────────────────────────────────────────────────────────────────────────┘
• ┌────────────────────────────────────────────────────────────────────────────────────────┐
• │ 5. ESOPHAGEAL RUPTURE (Boerhaave Syndrome) │
• │ • Pathophysiology: Transmural esophageal tear post-retching -> mediastinitis / sepsis │
• │ • Exam: Severe vomiting, subcutaneous crepitus, Hamman crunch, septic shock │
• │ • Workup: Water-soluble (Gastrografin) esophagram or contrast CT; broad-spectrum abx │
• └────────────────────────────────────────────────────────────────────────────────────────┘
• Detailed Management of the Big 5 Life Threats
• 1. Acute Pulmonary Embolism (PE)

Pathophysiology : Thromboemboli originating from the deep venous system (most commonly the ileofemoral veins) embolize to the pulmonary arterial bed, abruptly increasing right ventricular afterload, impairing gas exchange, and causing ventilation-perfusion mismatch.

Diagnostic Strategy :

Apply the Wells Score for PE : Tachycardia (HR > 100 bpm) [+1.5], prior DVT/PE [+1.5], recent surgery/immobilization [+1.5], clinical signs of DVT [+3], hemoptysis [+1], active malignancy [+1], alternative diagnosis less likely than PE [+3].

If Wells score <= 4 (PE unlikely): Apply the PERC Rule (Age < 50, HR < 100, SpO2 >= 95%, no prior DVT/PE, no recent trauma/surgery, no hemoptysis, no estrogen use, no unilateral leg swelling). If all 8 criteria are met, PE is ruled out (<1% probability) without laboratory testing or imaging. If any PERC criterion is positive, obtain an age-adjusted D-dimer (for age > 50: age x 10 mcg/L). If D-dimer is normal, PE is excluded.

If Wells score > 4 (PE likely) or D-dimer is elevated: Obtain Computed Tomography Pulmonary Angiography (CTPA) .

Emergency Management : Parenteral anticoagulation (enoxaparin or unfractionated heparin). In massive PE presenting with sustained hypotension (systolic BP < 90 mm Hg), administer immediate systemic thrombolysis ( alteplase 100 mg IV over 2 hours) or perform catheter-directed embolectomy.

2. Acute Aortic Dissection

Pathophysiology : A primary tear in the aortic intima allows high-pressure blood to propagate longitudinally through the aortic media, creating a false lumen that compresses branch vessels and may rupture into the pericardial or pleural spaces.

Pathognomonic Red Flags :

Abrupt onset of agonizing, "sharp", "ripping", or "tearing" chest or interscapular back pain that is maximal at inception.

Asymmetric pulses or a systolic blood pressure disparity > 20 mm Hg between upper extremities.

New high-pitched, decrescendo early diastolic murmur of acute aortic regurgitation at the right sternal border (indicating retrograde dissection disrupting the aortic root).

Focal neurologic deficits (stroke from carotid artery compromise, paraplegia from spinal artery ischemia).

Classification & Emergency Action :

Stanford Type A (involves ascending aorta): Surgical Emergency . Immediate cardiothoracic surgical consultation for emergent open repair.

Stanford Type B (confined to descending aorta distal to left subclavian): Managed medically in the ICU unless complicated by malperfusion or rupture. Target a heart rate < 60 bpm and systolic BP 100 to 120 mm Hg .

DRUG ORDER PEARL : Always initiate intravenous beta-blockers (esmolol or labetalol) FIRST to reduce myocardial contractility and shearing force (dP/dt) before administering arterial vasodilators (nitroprusside or nicardipine). Vasodilators given alone trigger reflex tachycardia, which increases shear stress and accelerates aortic rupture!

3. Tension Pneumothorax

Pathophysiology : A one-way valve pleural defect permits atmospheric air entry during inspiration but prevents egress during expiration. Progressively rising intrapleural pressure collapses the ipsilateral lung, shifts mediastinal structures toward the contralateral side, compresses the vena cava, abolishes venous return, and triggers obstructive shock.

Physical Exam : Unilateral absence of breath sounds, unilateral hyperresonance to percussion , distended neck veins (JVD), severe hypotension, tachypnea, and late contralateral tracheal deviation.

LIFESAVING CLINICAL RULE : Tension pneumothorax is a CLINICAL DIAGNOSIS . Never delay emergency decompression to obtain a chest radiograph in an unstable patient! Immediately perform needle thoracostomy using a large-bore (14–16 gauge, >= 5 cm) angiocatheter at the 2nd intercostal space in the midclavicular line or the 4th/5th intercostal space in the anterior axillary line, followed immediately by definitive tube thoracostomy (chest tube).

4. Esophageal Rupture (Boerhaave Syndrome)

Pathophysiology : Full-thickness barogenic perforation of the distal esophagus (typically the left posterolateral wall 2–3 cm above the gastroesophageal junction) caused by violent vomiting, retching, or heavy lifting against a closed glottis. Extravasation of acidic gastric contents into the mediastinum causes rapid necrotizing mediastinitis and septic shock.

Clinical Presentation : Mackler Triad —(1) Forceful vomiting or retching, (2) Sudden, excruciating retrosternal or epigastric chest pain, and (3) Palpable subcutaneous emphysema in the neck and supraclavicular fossa.

Pathognomonic Sign : Hamman sign (a loud crunching, raspy sound heard over the precordium synchronous with the heartbeat due to mediastinal air).

Diagnostic Confirmation : Emergency chest CT with oral water-soluble contrast (Gastrografin) or water-soluble esophagram. Barium is strictly avoided because extravasated barium causes severe, permanent granulomatous mediastinitis. Thoracentesis reveals cloudy fluid with an acidic pH (<6.0) and high salivary amylase concentration.

Emergency Management : NPO, broad-spectrum IV antibiotics covering oral flora and anaerobes, IV antifungal therapy, aggressive fluid resuscitation, and emergent cardiothoracic surgical consultation for operative repair or endoscopic esophageal stenting.

High-Risk Physical Exam Features & Diagnostic Likelihood Ratios

Clinical evaluation of chest pain relies heavily on understanding the diagnostic power of specific historical and physical examination features:

Diagnostic Accuracy for Acute Myocardial Infarction

Historical / Examination Finding Sensitivity Specificity Positive Likelihood Ratio (+LR) Negative Likelihood Ratio (-LR)

• Radiation to both arms or shoulders 15–20% 95–98% 2.6 – 4.1 0.8
• Radiation to right arm or shoulder 10–15% 96–98% 2.2 – 2.8 0.9
• Radiation to left arm alone 30–40% 75–80% 1.3 – 1.5 0.8
• Third heart sound (S3 gallop) 5–10% 98% 3.2 0.9
• Hypotension (SBP < 90 mm Hg) 5–10% 98% 3.1 0.9
• Diaphoresis observed on exam 40–50% 75–80% 2.0 0.7
• Completely normal 12-lead ECG — — — 0.1 – 0.3
• Pleuritic or positional pain 15–20% 85% 0.2 1.1
• Reproducible chest wall tenderness 10–15% 80% 0.2 – 0.4 1.1

Clinical Exam Pearl : While reproducible chest wall tenderness lowers the probability of ACS (-LR ~0.2–0.4), up to 10% to 15% of patients with confirmed acute myocardial infarction also exhibit reproducible chest wall tenderness . Therefore, reproducible tenderness must never be used in isolation to dismiss chest pain in patients with vascular risk factors.

Atypical Presentations in Vulnerable Populations

Certain high-risk demographic cohorts frequently present without typical substernal chest pressure, experiencing "anginal equivalents" that lead to dangerous diagnostic delays:

Diabetic Patients : Diabetic autonomic neuropathy blunts visceral sensory afferents; presentation often consists of painless dyspnea, nausea, fatigue, or acute diaphoresis.

Women : More frequently report fatigue, nausea, shortness of breath, epigastric discomfort, and sleep disturbance rather than severe crushing chest pressure.

Elderly Individuals (>= 75 years) : Common presentations include acute confusion/delirium, syncope, generalized weakness, or acute functional decline.

Non-Cardiac Chest Pain Etiologies in Primary Care

Once the Big 5 thoracic life threats have been rigorously excluded, ambulatory clinicians must evaluate common benign non-cardiac mimics:

Musculoskeletal Chest Wall Syndromes (Costochondritis & Tietze Syndrome) :

Costochondritis : Sharp, aching pain localized to the parasternal costochondral or chondrosternal junctions (most commonly 2nd to 5th costal cartilages). Pain is reproducible on direct palpation and exacerbated by deep inspiration and upper body rotation.

Tietze Syndrome : A distinct, rarer inflammatory entity distinguished from costochondritis by the presence of visible, palpable swelling, erythema, and localized warmth over the affected costochondral junction (usually 2nd or 3rd rib). Managed with scheduled oral NSAIDs and physical reassurance.

Gastroesophageal Reflux Disease (GERD) & Diffuse Esophageal Spasm :

GERD presents with retrosternal burning (heartburn) radiating cephalad, aggravated by large meals, recumbency, or acidic foods, and relieved by antacids.

Diffuse esophageal spasm produces severe retrosternal pressure radiating to the back, neck, or jaw, clinically mimicking angina. Because esophageal smooth muscle relaxes in response to nitric oxide, esophageal spasm pain is promptly relieved by sublingual nitroglycerin . Symptom relief following nitroglycerin or a "GI cocktail" (antacid plus viscous lidocaine) does NOT distinguish esophageal pathology from acute coronary ischemia.

Herpes Zoster (Pre-Eruptive Neuralgia) :

Unilateral, burning, lancinating, or dysesthetic pain strictly confined to a single thoracic dermatome. Precedes the pathognomonic eruption of clustered erythematous vesicles by 2 to 5 days , frequently misdiagnosed as acute pleurisy, radiculopathy, or cardiac ischemia in the pre-eruptive phase.

Biliary Colic & Acute Cholecystitis :

Episodic severe dull ache in the epigastrium and right upper quadrant radiating around the right costal margin to the right scapula (Boas sign, mediated by phrenic nerve afferents). Often triggered by fatty meals and accompanied by nausea.

Panic Disorder & Hyperventilation Syndrome :

Sudden, discrete surges of intense fear or discomfort accompanied by chest tightness, palpitations, trembling, diaphoresis, and impending doom. Rapid tachypneic breathing causes acute hypocapnia, respiratory alkalosis, and cerebral vasoconstriction, producing characteristic perioral and digital paresthesias (tingling) and carpopedal spasm. Panic disorder is strictly a diagnosis of exclusion after organic cardiopulmonary disease is ruled out.

Loading diagram... Acute Chest Pain Risk Stratification & Big 5 Exclusion Algorithm