# Clinical context An ICU client with eGFR 18 mL/min/1.73 m2 is receiving a titrated sodium nitroprusside infusion for a hypertensive emergency; the nurse reviews the infusion record, laboratory trend, and neurologic findings. A client with eGFR 18 mL/min/1.73 m2 is receiving sodium nitroprusside. Highlight the findings that require prompt toxicity follow-up.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=522760&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

Clinical context
An ICU client with eGFR 18 mL/min/1.73 m2 is receiving a titrated sodium nitroprusside infusion for a hypertensive emergency; the nurse reviews the infusion record, laboratory trend, and neurologic findings.

A client with eGFR 18 mL/min/1.73 m2 is receiving sodium nitroprusside. Highlight the findings that require prompt toxicity follow-up.

| Domain | Finding |
| --- | --- |
| Infusion | Mean nitroprusside rate is 4 mcg/kg/min with eGFR 18 mL/min/1.73 m2 |
| Monitoring | Blood pressure is measured continuously |
| Laboratory | New unexplained metabolic acidosis |
| Infusion | Mean rate is 1 mcg/kg/min with stable blood pressure and no toxicity symptoms. |
| Neurologic | New tinnitus, pinpoint pupils, and hyperreflexia |
| Hemodynamics | Increasing dose is required to maintain the same blood-pressure response |
| Neurologic | Client is alert, pupils are equal, and reflexes are unchanged from baseline. |
| Oxygen delivery | Tissue hypoxia signs despite adequate cardiac output and arterial oxygen tension |

## Explanation

A mean rate above the renal limit, increasing dose requirement, unexplained metabolic acidosis, tinnitus, miosis, hyperreflexia, and impaired oxygen delivery despite adequate arterial oxygen tension require prompt evaluation for cyanide, thiocyanate, or methemoglobin toxicity.

## In-depth explanation

Quick answer
Connect renal clearance, infusion intensity, neurologic cues, acid-base change, and oxygen-delivery failure.

Why this is correct
Thiocyanate accumulates when renal clearance is poor. Cyanide toxicity can first appear as increasing dose requirements and later acidosis; methemoglobinemia impairs tissue oxygen delivery despite an adequate arterial oxygen tension.

Easy analogy or mental picture
Build a medication safety chain: identify the cue cluster, connect it to the drug mechanism, stop preventable exposure, stabilize the client, and verify the response with measurable findings.

Memory hook
Cue cluster, medication mechanism, protective action, and measurable reassessment.

NCLEX decision rule
Choose the action that prevents the most immediate medication-related harm while preserving treatment for the underlying condition.

Why the other choices are wrong
Options that rely on one reassuring value, continue a suspect exposure, bypass monitoring, or delay escalation leave the medication hazard active.References
1DailyMed: Sodium Nitroprusside in 0.9% Sodium ChlorideCyanide, thiocyanate, methemoglobin, rate limits, renal accumulation, and toxicity monitoring

## Clinical scenario

Clinical context
An ICU client with eGFR 18 mL/min/1.73 m2 is receiving a titrated sodium nitroprusside infusion for a hypertensive emergency; the nurse reviews the infusion record, laboratory trend, and neurologic findings.

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