MCQ-Too Early… or Too Late? When Dialysis Is a Decision, Not a Reflex

🧠🩸 Too Early… or Too Late? When Dialysis Is a Decision, Not a Reflex. 🩸🧠

Clinical Vignette

“Critical Care / Renal Replacement Therapy
A 74-year-old woman with hypertension and coronary artery disease is admitted to the ICU with septic shock from intra-abdominal sepsis. She requires norepinephrine at 0.15 µg/kg/min and mechanical ventilation. Over 48 hours, she develops worsening acute kidney injury with creatinine rising from 1.1 mg/dL to 3.4 mg/dL, oliguria (<200 mL/day), metabolic acidosis (pH 7.26), and rising urea levels.

She has no life-threatening hyperkalemia or pulmonary edema. The ICU team debates whether to initiate early renal replacement therapy (RRT) preemptively or to delay RRT until standard indications develop.

One intensivist argues that early RRT may prevent complications and improve outcomes. Another cites large randomized trials suggesting no mortality benefit to early initiation and potential harms, including catheter-related complications and dialysis dependence.

The patient’s family asks whether starting dialysis now will improve her chances of survival or recovery.

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1. In the presented ICU vignette, which population best aligns with the PICO framework used to study timing of renal replacement therapy (RRT)?

A. All ICU patients with any stage of acute kidney injury

B. Patients with septic shock and immediate life-threatening hyperkalemia

C. Critically ill adults with severe AKI without urgent indications for RRT

D. Patients with chronic kidney disease already on maintenance dialysis

E. Postoperative patients with transient oliguria

2. Which study design is most appropriate to establish a causal relationship between early versus delayed initiation of RRT in critically ill patients?

A. Case series

B. Cross-sectional study

C. Observational cohort study

D. Randomized controlled trial

E. Case–control study

3. When informing patient and family decision-making regarding RRT timing, which outcome should be prioritized?

A. Delivered dialysis dose

B. Reduction in serum urea concentration

C. Short-term and long-term mortality with functional recovery

D. ICU length of stay alone

E. Time to dialysis catheter insertion

4. Which factor most complicates systematic reviews and meta-analyses examining early versus delayed RRT initiation?

A. Absence of randomized trials

B. Uniform definitions of “early” and “delayed” RRT

C. Heterogeneity in patient populations, initiation triggers, and RRT modalities

D. Lack of mortality as an endpoint

E. Excessive blinding across trials

5. Which of the following represents a potential harm associated with routine early initiation of RRT in the absence of urgent indications?

A. Improved renal recovery

B. Reduced risk of catheter-related complications

C. Increased exposure to invasive therapy and treatment-related complications

D. Lower incidence of hemodynamic instability

E. Reduced long-term dialysis dependence

6. In which clinical scenario is the external validity of landmark RRT timing trials most limited?

A. Septic shock with moderate vasopressor requirement

B. Mechanically ventilated patient without significant fluid overload

C. Patient with refractory pulmonary edema causing hypoxemia

D. Severe AKI without emergent metabolic indications

E. Mixed medical–surgical ICU population

7. Which type of bias is most difficult to eliminate in randomized trials comparing early versus delayed RRT initiation?

A. Selection bias

B. Measurement bias for mortality

C. Performance bias due to open-label trial design

D. Publication bias

E. Recall bias

8. Which statement best reflects an evidence-consistent bedside explanation to family members regarding early versus delayed RRT?

A. “Early dialysis consistently improves survival in septic shock.”

B. “Waiting to start dialysis is unsafe in critically ill patients.”

C. “Dialysis will inevitably be required, so starting now is preferable.”

D. “Starting dialysis early has not shown a clear survival benefit and may expose patients to harm; we will monitor closely and initiate it if clear indications develop.”

E. “Current guidelines mandate early dialysis in this situation.”

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🧠🩸 Too Early… or Too Late? When Dialysis Is a Decision, Not a Reflex. 🩸🧠

Clinical Vignette

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