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CCRN — Adult Critical Care
CCRN Sepsis & Shock Practice Questions
Sepsis and shock sit at the intersection of the CCRN's hemodynamics, pulmonary, and multisystem content — and the exam treats them as time-critical recognition-and-resuscitation problems. The competencies tested: identify sepsis early, execute the resuscitation bundle, interpret lactate and fluid responsiveness, choose and titrate vasopressors by mechanism, and recognize the slide into multi-organ dysfunction.
This guide reviews septic and other distributive shock states and drills CCRN-style questions with rationales. Educational review only: bundle timing, fluid volumes, and pressor choices follow current Surviving Sepsis guidance and your institution's protocols — verify before applying.
Recognition and the resuscitation bundle
Recognition: sepsis is a dysregulated host response to infection causing organ dysfunction; the exam expects you to connect a suspected/known infection with signs of hypoperfusion and organ failure (altered mentation, oliguria, rising creatinine, hypotension, elevated lactate, coagulopathy). Septic shock is sepsis with vasopressor-requiring hypotension and an elevated lactate despite adequate fluid resuscitation. Early-warning physiology (tachycardia, tachypnea, fever or hypothermia, leukocyte changes, subtle mentation change) precedes overt collapse — and catching it early is the single biggest survival lever.
The bundle: obtain cultures before antibiotics when feasible, give broad-spectrum antibiotics early (every hour of delay in septic shock costs survival), measure and trend lactate, resuscitate with crystalloid for hypotension or elevated lactate (a commonly cited starting target around 30 mL/kg, individualized by reassessment), and start vasopressors for hypotension not responsive to fluids to maintain MAP ≥65. Source control (drain the abscess, remove the line, debride) is definitive and frequently the missing piece in exam scenarios. Reassess perfusion dynamically rather than chasing a single static number.
Pressors, lactate, and the path to MODS
Vasopressors by mechanism: norepinephrine (alpha-dominant with some beta-1) is first-line for septic shock — it restores the vascular tone that sepsis destroys; vasopressin is commonly added as an adjunct to reduce catecholamine requirements; epinephrine is an alternative/add-on; phenylephrine (pure alpha) has niche uses. Match the broken variable: distributive shock's problem is SVR, so a vasoconstrictor is the rational fix once the tank is filled. Inotropes are added when myocardial dysfunction (septic cardiomyopathy) limits output despite adequate tone and volume.
Lactate and trends: elevated lactate reflects tissue hypoperfusion/anaerobic metabolism and stress; clearance (a falling lactate with resuscitation) is the meaningful signal that therapy is working, while a rising lactate demands reassessment (inadequate resuscitation, ongoing source, secondary problem). MODS: persistent shock and inflammation injure organs in sequence — ARDS (lungs), acute kidney injury (oliguria, rising creatinine), hepatic dysfunction, coagulopathy/DIC, and encephalopathy. The CCRN expects you to monitor for the cascade, support each failing system, and understand that prevention (early recognition, timely antibiotics, source control, adequate but not excessive fluids) is what keeps a septic patient from progressing to MODS.
Practice questions with answers & rationales
Q1. A post-op patient is febrile, tachycardic, breathing fast, confused, with a lactate of 4.2 and MAP 60. What is your immediate priority set?
Answer: Treat as sepsis/septic shock: obtain cultures (and a source workup) without delaying care, start broad-spectrum antibiotics urgently, begin crystalloid resuscitation for the hypotension and elevated lactate, and reassess; if the MAP stays below 65 after adequate fluids, start norepinephrine. Hunt for source control (the surgical site, an abscess, a line). Antibiotic timing and the fluid/pressor sequence are the most-tested elements — delay is the planted error.
Q2. Why is norepinephrine the first-line vasopressor in septic shock rather than a pure inotrope or pure alpha agent?
Answer: Septic shock's core defect is pathologic vasodilation — low SVR — so the rational first agent restores vascular tone: norepinephrine's strong alpha-1 effect raises SVR/MAP, with modest beta-1 support for output. A pure inotrope doesn't fix tone (and can worsen vasodilation); a pure alpha agent lacks the output support some patients need. Vasopressin is added to spare catecholamines; inotropes join only when septic cardiomyopathy limits output despite tone and volume.
Q3. What does a falling lactate during resuscitation tell you, and what does a rising one demand?
Answer: A falling (clearing) lactate signals improving perfusion — your antibiotics, fluids, and pressors are working — and is among the strongest simple markers that septic shock is reversing. A rising lactate despite therapy demands reassessment: inadequate volume, an uncontrolled source, a missed second diagnosis, or progressing organ failure. The trend, not the single value, drives decisions — and the exam frames lactate as a resuscitation compass.
Q4. A septic patient remains hypotensive after 30 mL/kg of crystalloid. What's the next step, and why not simply give more fluid?
Answer: Start a vasopressor (norepinephrine) to maintain MAP ≥65 — persistent hypotension after adequate fluids defines the need for pressors, and continuing to flood a vasoplegic patient risks pulmonary edema, abdominal/tissue edema, and worse outcomes without fixing the unaddressed problem (vascular tone). Assess fluid responsiveness dynamically before additional boluses, and pursue source control. Knowing when to transition from fluids to pressors is the tested judgment.
Q5. Distinguish the hemodynamic profile of early septic (distributive) shock from cardiogenic shock.
Answer: Early septic shock: low SVR with often normal or high cardiac output ('warm shock'), wide pulse pressure, warm extremities, low-to-normal filling pressures. Cardiogenic shock: low cardiac output with high SVR, high filling pressures, cool clamped skin, congestion. They can both present with hypotension, but the resistance, output, and skin findings diverge — and so does treatment (restore tone/volume vs support the pump). Misclassifying them leads to opposite, harmful interventions.
Q6. Which findings suggest a septic patient is progressing to multiple organ dysfunction?
Answer: New or worsening organ failures: hypoxemia/ARDS (rising oxygen requirement, bilateral infiltrates), acute kidney injury (oliguria, rising creatinine), coagulopathy/DIC (falling platelets, prolonged times, bleeding), hepatic dysfunction (rising bilirubin/transaminases), and encephalopathy (declining mentation). Monitoring for the cascade and supporting each system while controlling the source is the management approach — and recognizing the slide early is the CCRN competency being tested.
Q7. Why is source control emphasized even when antibiotics and resuscitation are underway?
Answer: Antibiotics and resuscitation buy time, but an ongoing source (abscess, infected device, necrotic tissue, obstructed urinary/biliary system) keeps seeding the inflammatory response — so the patient won't truly stabilize until the source is drained, removed, or debrided. Source control is definitive therapy, frequently the missing intervention in a patient who 'isn't responding,' and the exam often hides it as the correct next step behind more obvious bundle elements.
Common mistakes to avoid
- Delaying antibiotics in septic shock — every hour of delay costs survival.
- Continuing large-volume fluids in a fluid-unresponsive, vasoplegic patient instead of starting a vasopressor.
- Choosing a pure inotrope or pure alpha agent over norepinephrine for the SVR problem of septic shock.
- Treating a single lactate value rather than its trend (clearance).
- Misclassifying distributive versus cardiogenic shock and applying opposite, harmful treatments.
- Overlooking source control while focusing only on drugs and fluids.