Critical Care Medicine
Learning Objectives
- Identify the major subspecialties within critical care medicine and the types of patients each ICU serves
- Explain the core competencies required of intensivists and ICU team members
- Distinguish between different modes of respiratory and cardiovascular support used in the ICU
- Describe the indications and goals of renal replacement therapy in critically ill patients
- Summarize the Sepsis-3 diagnostic criteria and the key pillars of sepsis management
- Recognize the ethical and end-of-life considerations that arise frequently in critical care
Quick Answer
Critical care medicine is the specialized field dedicated to managing life-threatening illness and injury in the ICU. It blends expertise from internal medicine, surgery, pulmonology, cardiology, and nephrology into a unified, multidisciplinary approach. The ICU team monitors unstable patients around the clock, deploying mechanical ventilation, vasopressors, renal replacement, and other organ-support therapies as needed. In the United States, ICU care is delivered by fellowship-trained intensivists who coordinate with nurses, respiratory therapists, pharmacists, and specialists to optimize outcomes for the sickest patients in the hospital.
Topics at a Glance
| Topic | Core Focus | Why It Matters |
|---|---|---|
| Introduction to Critical Care Medicine | Scope of practice, patient population, competencies | Frames the field and career pathways |
| Intensive Care Unit Procedures | Mechanical ventilation, hemodynamic monitoring, ECMO, sedation | Day-to-day interventions in any ICU |
| Respiratory Support Techniques | Ventilator modes, NIV, oxygen therapy, airway management | Respiratory failure is the most common ICU admission reason |
| Cardiovascular Support Techniques | CPR, vasopressors, ECMO, hemodynamic monitoring | Circulatory shock is immediately life-threatening |
| Renal Replacement Therapy in ICU | CRRT, IHD, SLED — indications and monitoring | AKI complicates over 50% of ICU admissions |
| Sepsis Management in ICU | Pathophysiology, Sepsis-3, antibiotics, fluid resuscitation | Sepsis is the leading cause of ICU mortality worldwide |
Key Terms
| Term | Definition | Related Concept |
|---|---|---|
| Intensivist | Physician fellowship-trained in critical care medicine who leads the ICU team | Multidisciplinary team |
| SOFA Score | Sequential Organ Failure Assessment — quantifies organ dysfunction across six systems | Sepsis-3 diagnosis |
| Mechanical Ventilation | Use of a ventilator machine to support or replace a patient's breathing | Respiratory failure, ARDS |
| Vasopressor | Drug that raises blood pressure by causing vasoconstriction (e.g., norepinephrine) | Septic shock, MAP target |
| CRRT | Continuous Renal Replacement Therapy — 24-hour dialysis for hemodynamically unstable patients | Acute kidney injury |
| ECMO | Extracorporeal Membrane Oxygenation — external heart-lung bypass for refractory failure | Cardiogenic shock, severe ARDS |
| ARDS | Acute Respiratory Distress Syndrome — diffuse lung injury with severe hypoxemia | Lung-protective ventilation |
| Sepsis | Life-threatening organ dysfunction caused by a dysregulated response to infection | SOFA, Surviving Sepsis Campaign |
Related Topics
Prerequisites: General pathophysiology, cardiovascular physiology, respiratory physiology, renal physiology, pharmacology (vasopressors, antibiotics)
Related Topics: Pulmonology (ARDS, COPD exacerbation), Cardiology (acute MI, cardiogenic shock), Nephrology (acute kidney injury), Infectious Disease (sepsis, antimicrobial stewardship), Anesthesiology (airway management, sedation)
Next Topics: Advanced hemodynamic monitoring, post-ICU rehabilitation, palliative care in the ICU, trauma surgery critical care