# Stage 2 — Analyze cues. For each factor, identify how it contributes to the current lithium toxicity risk.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=568859&lang=en  
> language: en  
> subject: Safety and Infection Prevention and Control  
> category: SIPC

## Question

Stage 2 — Analyze cues. For each factor, identify how it contributes to the current lithium toxicity risk.

|  | Volume and sodium depletion | Reduced clearance from thiazide | Reduced clearance from NSAID | Reduced clearance from kidney injury |
| --- | --- | --- | --- | --- |
| Three days of vomiting and diarrhea |  |  |  |  |
| Continued hydrochlorothiazide |  |  |  |  |
| Ibuprofen every six hours |  |  |  |  |
| Creatinine increased from 0.9 to 1.8 mg/dL |  |  |  |  |

## Explanation

Volume depletion promotes lithium retention, thiazide-related sodium loss reduces lithium clearance, NSAIDs can reduce renal clearance, and acute kidney injury further limits elimination. These mechanisms act together rather than representing unrelated findings.

## In-depth explanation

Quick answer
Dehydration, thiazide use, NSAID use, and acute kidney injury all push lithium concentration upward through different routes.

Why this is correct
Lithium depends on renal handling and tracks sodium and water balance. Several modest risks can combine into major accumulation.

Easy analogy or mental picture
The exit drain narrows while the tank loses water: lithium becomes more concentrated and leaves more slowly.

Memory hook
Low volume plus low clearance equals high lithium.

NCLEX decision rule
In medication toxicity, connect illness, prescription drugs, over-the-counter drugs, and organ function before treating any cue in isolation.

Why the other choices are wrong
Each factor has a specific mechanism; assigning all of them merely to dehydration misses preventable interaction risks.

References
1Lithium Carbonate Capsules Prescribing InformationLithium toxicity manifestations, dehydration risk, renal impairment, monitoring, and patient counseling
2Lithium and Lithium Carbonate Full Prescribing InformationDiuretic, NSAID, sodium, hydration, renal clearance, and serum monitoring interactions

## Clinical scenario

Case update
The nurse reconciles recent illness, nonprescription medication use, scheduled medications, and renal laboratory changes.

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