What is Marino’s The ICU Book, 5th Edition?
Marino's The ICU Book, 5th Edition (2025) is a comprehensive, single-authored critical care textbook by Paul L. Marino, MD, PhD, FCCM. With 53 chapters covering everything from vascular access to mechanical ventilation and shock syndromes, it serves as an essential bedside reference for ICU residents, intensivists, nurses, and medical students.
Introduction
If there is one book that has quietly shaped the clinical thinking of generations of intensivists, it is Marino's The ICU Book.
Now in its fifth edition—published in 2025 by Wolters Kluwer—this landmark textbook enters its 33rd year of continuous service as a go-to reference for the care of critically ill adults.
Few medical textbooks survive three decades of rapid clinical advancement and remain as relevant and as readable as they were on day one. Marino's ICU Book is one of them.
What makes this book stand out isn't just the breadth of its content. It's the philosophy behind it. Dr. Marino has spent 44 years as a critical care specialist, and he brings that accumulated clinical wisdom to every chapter—writing with a clarity and practical sensibility that many multi-authored textbooks can rarely achieve. This is a book for the ICU bedside, not the library shelf.
Whether you are a medical student preparing for your first ICU rotation, a resident trying to make sense of a hemodynamically unstable patient at 2 AM, or an experienced attending looking to stay current with evidence-based guidelines, this edition has something meaningful to offer.
Book Overview
|
Detail |
Information |
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Full
Title |
Marino's The ICU Book, Fifth Edition |
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Author |
Paul L. Marino, MD, PhD, FCCM |
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Illustrator |
Patricia Gast |
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Publisher |
Wolters Kluwer |
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Edition |
5th Edition |
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Copyright
Year |
2025 |
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ISBN |
978-1-975176-71-6 |
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Pages |
947 |
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Medical
Specialty |
Critical Care Medicine / Intensive
Care |
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Intended
Audience |
Medical students, interns,
residents, intensivists, ICU nurses, pharmacists |
Dr. Marino is a clinical associate professor at Weill Cornell Medical College in New York, and the illustrations throughout the book are the work of Patricia Gast, who has collaborated with Dr. Marino across six textbooks. The result is a visually rich text with 238 original illustrations and 207 tables—an average of four to five figures and four tables per chapter.
What This Book Covers
Marino's The ICU Book, 5th Edition, is organized into 17 sections and 53 chapters, covering virtually every system and scenario encountered in the adult intensive care unit.
The scope is deliberately broad by design — as Dr. Marino states in the preface, the intent is to "craft a textbook that focuses on fundamental concepts and practices that can be used in any ICU, regardless of the specialty designation of the unit."
Vascular Access (Section I)
The book opens with a remarkably thorough section on vascular access—a topic that underpins nearly every ICU intervention.
From the physics of catheter flow (grounded in the Hagen-Poiseuille equation) to the practical selection of peripheral, midline, PICC, and central venous catheters, this section builds from first principles.
The chapter on intraosseous access — including step-by-step guidance on the EZ-IO device, site selection at the proximal femur and tibia, and pre-infusion pain control with lidocaine — is a practical gem rarely covered so thoroughly in critical care texts.
Common ICU Practices (Section II)
Early chapters address the daily prophylactic measures that have a major impact on patient outcomes: alimentary (stress ulcer) prophylaxis, venous thromboprophylaxis, and the complex management of analgesia and sedation.
These are areas where evidence has evolved considerably, and the fifth edition reflects current guidelines.
Physiological Monitoring (Section III)
A dedicated section on monitoring covers pulse oximetry, capnography, the pulmonary artery catheter, and — critically — systemic oxygenation. Dr. Marino explains the relationship between oxygen delivery (DO₂), oxygen consumption (VO₂), central venous oxygen saturation (ScvO₂), and the venoarterial PCO₂ gap in a way that is mechanistically satisfying and immediately clinically useful.
The discussion of the PCO₂ gap as a more specific marker of tissue hypoperfusion than ScvO₂ alone reflects contemporary evidence.
Fluid Therapy and Shock (Sections IV–VI)
This is where the new edition adds significant value. A brand-new chapter on fluid management (Chapter 11) addresses fluid responsiveness, passive leg raising, stroke volume variation, and the pitfalls of over-resuscitation.
The shock section has been expanded to include new standalone chapters on Approaches to Clinical Shock (Chapter 14), Cardiogenic Shock (Chapter 16), and Hemorrhagic and Inflammatory Shock Syndromes—giving the clinician a clear framework for each shock phenotype.
Cardiac Disorders (Section VII)
Acute heart failure, tachyarrhythmias, acute coronary syndromes, and cardiac arrest are each addressed in dedicated chapters. The treatment algorithms are clearly explained and aligned with contemporary guidelines.
Respiratory Disorders and Management (Sections VIII–IX)
A major strength of the book lies in its respiratory coverage. New in this edition are a chapter on acute pulmonary embolism (Chapter 22) and a chapter on noninvasive ventilation (Chapter 26).
Other respiratory chapters cover ARDS, asthma, and COPD in the ICU, conventional mechanical ventilation, management of the ventilator-dependent patient, ventilator-associated pneumonia, and liberation from mechanical ventilation.
The progression from pathophysiology to management is logical and builds excellent clinical reasoning.
Acid-Base and Electrolytes (Sections X–XI)
Three chapters cover acid-base analysis, lactic acidosis and ketoacidosis, and metabolic alkalosis. The renal and electrolyte section addresses acute kidney injury and individual electrolyte disorders — sodium, potassium, magnesium, calcium, and phosphorus — each in a dedicated chapter.
Abdomen, Temperature, Neurology, Nutrition, and Toxicology (Sections XII–XVI)
The final sections provide an ICU-relevant survey of abdominal emergencies (liver failure, pancreatitis, infections), thermoregulatory disorders, fever, neurological disorders of consciousness and movement, acute stroke, nutritional support (enteral and parenteral), adrenal and thyroid dysfunction, and both pharmaceutical and nonpharmaceutical poisonings.
Appendices (Section XVII)
The book closes with practical appendices covering units and conversions, selected reference ranges, and "The Body Fantastic"—a summary of key physiological constants that serves as a quick reference at the bedside.
Key Features
- Single-author consistency: Written entirely by one author with 44 years of critical care experience, giving the text a coherent voice and logical structure that multi-authored textbooks often lack.
- 238 original illustrations and 207 tables: Each chapter averages four to five illustrations and four tables, making abstract physiology visual and accessible.
- "A Final Word" in every chapter: A brief closing section in each chapter where Dr. Marino highlights key clinical insights, common pitfalls, or nuanced perspectives—a distinctive feature that adds genuine educational value.
- Updated references and clinical practice guidelines: Each chapter ends with contemporary references and the latest guidelines, supporting evidence-based practice.
- New chapters in the 5th edition: Five new chapters — Fluid Management, Approaches to Clinical Shock, Cardiogenic Shock, Acute Pulmonary Embolism, and Noninvasive Ventilation — address areas where practice has significantly evolved.
- Completely rewritten and reorganized: Not a minor revision — the fifth edition has been "reorganized and completely rewritten," according to the author's preface.
- Breadth without excessive length: Despite covering 53 chapters across 947 pages, the book maintains concise chapter presentations, living up to its reputation for clarity.
Who Should Read This Book
Medical students on their first clinical rotations or preparing for shelf exams will find the foundational physiological explanations (e.g., oxygen delivery mechanics, acid-base analysis, shock pathophysiology) written at a level that teaches the "why" alongside the "what."
Interns and residents—particularly those rotating through medical, surgical, cardiac, or neurological ICUs—will get the most immediate practical benefit. This is the classic "grab it when your patient is crashing" reference.
Intensivists and critical care fellows will appreciate the updated guidelines, evidence-based management sections, and the depth of physiological discussion that supports independent clinical reasoning.
ICU nurses and advanced practice providers will find the monitoring, fluid management, and ventilator sections particularly relevant to their daily practice.
Pharmacists working in critical care settings will benefit from the drug-specific chapters, particularly those covering sedation and analgesia, overdoses, and cardiovascular medications.
Exam candidates preparing for critical care medicine boards (ABIM, FCCP) will find the book's coverage of ACLS-relevant topics, ventilator management, and hemodynamic monitoring directly aligned with high-yield board content.
Why This Book Is Useful
Clinical Relevance
Marino's The ICU Book was built around the demands of real ICU practice. The discussions are grounded in bedside applicability—from choosing between crystalloid and colloid fluids to managing ventilator settings in ARDS to interpreting a rising lactate in a septic patient.
The physiological explanations are never academic for their own sake; they always serve the goal of better patient care.
Evidence-Based Content
Each chapter includes updated clinical practice guidelines and a curated reference list. The fluid management chapter, for example, reflects current evidence on fluid responsiveness testing, stroke volume variation, and the limitations of central venous pressure as a resuscitation target—areas where outdated textbooks continue to mislead clinicians.
Practical Applications
The book's strength is its balance between theory and practice. The vascular access section explains not just how to insert a catheter but also why the catheter's radius matters far more than its length for infusion rates.
The fluid management chapter teaches passive leg raising with precise step-by-step instructions and explains the physiological basis for the test.
Board Exam Usefulness
The breadth and clarity of the content make this an excellent board review companion for critical care certification. The topics covered—hemodynamic monitoring, mechanical ventilation, shock syndromes, electrolyte disorders, and acid-base analysis—map closely to critical care board examination blueprints.
Learning Efficiency
The combination of concise writing, rich illustrations, and the "A Final Word" feature at the end of each chapter makes this book highly efficient for learning. A reader can work through a chapter in 20–30 minutes and come away with a clinically actionable understanding of the topic.
Table of Contents Overview
The book is organized into 17 major sections:
Section I – Vascular Access (Ch. 1–3): Catheter fundamentals, central venous access, and indwelling catheter management.
Section II – Common Practices (Ch. 4–6): Alimentary prophylaxis, venous thromboprophylaxis, analgesia, and sedation.
Section III – Physiological Monitoring (Ch. 7–9): Oximetry and capnography, pulmonary artery catheter, systemic oxygenation.
Section IV – Intravenous Fluid Therapy (Ch. 10–11): IV fluids, fluid management (new chapter).
Section V – Blood Components (Ch. 12–13): RBC transfusions, platelets, and plasma.
Section VI – Shock Syndromes (Ch. 14–17): Clinical shock approaches (new), hemorrhagic shock, cardiogenic shock (new), and inflammatory shock.
Section VII – Cardiac Disorders (Ch. 18–21): Heart failure, tachyarrhythmias, ACS, cardiac arrest.
Section VIII – Respiratory Disorders (Ch. 22–24): Pulmonary embolism (new), asthma/COPD, ARDS.
Section IX – Respiratory Management (Ch. 25–30): Oxygen therapy, noninvasive ventilation (new), conventional MV, ventilator-dependent patient, VAP, weaning.
Section X – Acid-Base Disorders (Ch. 31–33): Acid-base analysis, lactic acidosis/ketoacidosis, metabolic alkalosis.
Section XI – Renal & Electrolyte Disorders (Ch. 34–38): AKI, sodium, potassium, magnesium, calcium/phosphorus.
Section XII—The Abdomen & Pelvis (Ch. 39–42): Liver failure, pancreatitis, abdominal infections, UTIs.
Section XIII – Altered Body Temperature (Ch. 43–44): Thermoregulatory disorders and ICU fever.
Section XIV – Nervous System Disorders (Ch. 45–47): Consciousness disorders, movement disorders, acute stroke.
Section XV – Nutrition & Metabolism (Ch. 48–50 + Ch. 51): Nutritional requirements, enteral and parenteral nutrition, and adrenal/thyroid dysfunction.
Section XVI – Overdoses & Poisons (Ch. 52–53): Pharmaceutical overdoses, nonpharmaceutical poisons.
Section XVII – Appendices: Units and conversions, reference ranges, physiological constants.
Strengths of the Book
The single most important strength of Marino's ICU Book is its authorial consistency. In a field where multi-authored textbooks often read as loosely assembled chapters with conflicting terminology and redundant coverage, Marino's text reads as a single coherent argument—one physician's carefully organized understanding of critical care medicine, offered to the reader without the editorial noise that typically accumulates when dozens of contributors are involved.
The physiological grounding throughout the text is another major strength. Rather than presenting clinical decisions as algorithms to be memorized, Dr. Marino consistently explains the physiological rationale behind each approach.
The discussion of the ScvO₂ and PCO₂ gap as complementary markers of tissue perfusion, for example, derives naturally from first principles and equips the reader to reason through novel clinical presentations rather than simply pattern match to a protocol.
The visual design of the book — with 238 original illustrations by Patricia Gast — is genuinely helpful. The figures are not decorative; they are didactic, built to reinforce the physiology being explained in the adjacent text.
The addition of five new chapters addressing some of the most clinically active areas in modern critical care (fluid management, cardiogenic shock, pulmonary embolism, noninvasive ventilation, and a structured approach to shock) demonstrates the author's commitment to keeping the text current without inflating its length.
Limitations
No clinical textbook is without its constraints. A few are worth acknowledging:
Single-author perspective: While authorial consistency is a strength, a single-author text necessarily reflects one clinician's interpretive lens. In areas of genuine controversy — such as optimal transfusion thresholds or the use of pulmonary artery catheters — readers should consult the cited primary literature and current guidelines for the broadest view.
Depth in subspecialty areas: Given its intentional breadth, Marino's ICU Book cannot substitute for subspecialty-focused texts in neurocritical care, cardiac critical care, or surgical critical care. Readers who need deeper disease-specific coverage in any one area will benefit from supplementing with dedicated specialty resources.
ICU pediatrics is out of scope: The book is focused exclusively on the care of critically ill adults. Pediatric or neonatal ICU applications are not addressed.
Comparison With Similar Books
Harrison's Principles of Internal Medicine covers critical illness within a much broader general medicine framework but lacks the procedural depth and ICU-specific physiological detail of Marino's text.
Principles of Critical Care (Hall, Schmidt, Kress) is the major multi-authored competitor. It offers more depth in certain subspecialty areas (e.g., neurocritical care and surgical critical care) and a broader set of contributor perspectives, but at the cost of the coherence and conciseness that define Marino's approach.
Oh's Intensive Care Manual is another multi-authored option with strong international adoption, organized as a practical handbook rather than a conceptually developed text.
Marino's unique niche—a single-authored, physiologically rigorous, consistently readable general ICU textbook—remains largely uncontested after three decades.
FAQs
Marino's The ICU Book is a comprehensive critical care textbook authored by Paul L. Marino, MD, PhD, FCCM. Now in its 5th edition (2025, Wolters Kluwer), it covers 53 chapters across 17 sections and addresses the full spectrum of adult ICU management, from vascular access and hemodynamic monitoring to mechanical ventilation, shock syndromes, and toxicology.
The author is Dr. Paul L. Marino, a clinical associate professor at Weill Cornell Medical College with 44 years of experience as a critical care specialist. The book is notable for being written entirely by a single author, giving it a consistent clinical voice across all chapters.
The 5th edition (2025) has been completely rewritten and reorganized. Five new chapters have been added: Fluid Management (Ch. 11), Approaches to Clinical Shock (Ch. 14), Cardiogenic Shock (Ch. 16), Acute Pulmonary Embolism (Ch. 22), and Noninvasive Ventilation (Ch. 26). It also includes 238 original illustrations, 207 tables, and updated references with current clinical practice guidelines in every chapter.
Yes. While primarily written for residents and ICU practitioners, the book's clear physiological explanations and structured approach make it accessible and highly educational for medical students on clinical rotations, particularly those rotating through internal medicine, emergency medicine, or surgery.
The 5th edition contains 53 chapters organized into 17 sections, two fewer chapters than the 4th edition, owing to the consolidation of certain overlapping topics. The book covers critical care from vascular access through nutrition, neurology, and toxicology.
Yes. The book's coverage of mechanical ventilation, hemodynamic monitoring, shock physiology, acid-base disorders, and electrolyte management closely aligns with the content domains of Critical Care Medicine board examinations (ABIM Critical Care subspecialty and FCCP credentialing).
"A Final Word" is a brief section at the end of every chapter in which Dr. Marino highlights key takeaways, clinical nuances, or personal insights about the topic. It serves as both a summary and an editorial note, offering a perspective that goes beyond the didactic content.
Unlike multi-authored texts, Marino's ICU Book benefits from a single, consistent authorial voice and a coherent organizational logic. While it may not match the subspecialty depth of books like Principles of Critical Care in every domain, it is widely regarded as more readable, more concise, and more reliably organized — making it a preferred first-line reference for residents and generalist intensivists.
Conclusion
After 33 years and five editions, Marino's The ICU Book remains one of the most trusted educational resources in adult critical care medicine. The 5th edition, published in 2025 by Wolters Kluwer, continues and improves upon the book's founding mission: to provide clear, physiologically grounded, and practically oriented guidance for anyone working in an intensive care unit.
Its greatest strength is also its most unusual quality — it reads as the work of one experienced clinician thinking carefully through the problems of critical illness, not as a committee product. The result is a book that teaches judgment, not just protocols.
For the intern beginning their first ICU rotation, the resident studying for boards, the nurse practitioner expanding their critical care practice, or the attending who wants a well-organized refresher grounded in current evidence, Marino's The ICU Book, 5th Edition is a resource that earns its place at the bedside.